For all you guys waiting on your Renegade Intake we are all most finished with are first Crossfire to Vortec conversion. It will use Stock Vortec heads that are just cleaned up under the valves and port matched. a stock vortec lower intake manifold with injecter holes welded up and a little grinding and a custom upper intake that the crossfire throttle bodies will bolt to. It will be a little higher then stock, Maybe a 1/2 inch. This mite be a problem on 82 vettes but 84's should work fine. We have done 4 chassis dyno pulls on the test car with the best of 208 RWHP are stock base line motor (84 Corvette/auto trans with 98674 miles on it) . Should be ready to redyno with the new head/intake combo this month, Looking for a 70 to 80HP increase most of witch comes from the heads but they wont work on a crossfire with out the new intake. The best thing is the top intake will be cheap to make (around $75.00) and the rest can be got from a salvage yard and with a little welding & grinding on the lower intake everything is bolt on. I Hope it makes good power but you never know it mite make less HP, We will see soon. I'm NOT going to be selling these intakes I'm just doing if for a customer but it's something all most of you can do at home, (with a little help from a machine shop)
David Steele

Oh, cool. That sounds crazy enough to work. Am I supose to call it a magical intake head combo of something? Is my back up enough? Should I start talking tough and act like I'm the authority on physics and science? Should I also brag about how many passes I have made and there is no way that that setup could touch me in the 1/4 mile because a ported stock crossfire is the way to go?

I think I would rather just say I hope your setup works well for you and produces alot of power:thumbsup:

Oh, cool. That sounds crazy enough to work. Am I supose to call it a magical intake head combo of something? Is my back up enough? Should I start talking tough and act like I'm the authority on physics and science? Should I also brag about how many passes I have made and there is no way that that setup could touch me in the 1/4 mile because a ported stock crossfire is the way to go?

I think I would rather just say I hope your setup works well for you and produces alot of power:thumbsup:

Drama queen.:loser:

Sounds like a cool setup, Dave.:thumbsup:

I agree. I thought about doing what you're talking about, several years ago...but had just sold my CFI car (a Trans Am)...so the idea went no where. I'm psyched to see someone pursue it fully...nice job. I assume that you made a custom lid? The Vortec lower is quite a bit narrower than the CFI lower; did you have to modify the throttle linkage to relocate the TB's or did they fit?

Pics would be sweet here...if you can swing it. I love the DIY nature of your project. Big thumbs up from me. :thumbsup:

PICS PLEASE! :)

Nice project, can't wait to hear your results!

PICS PLEASE! :)
Two questions: how did you deal w/the intake bolts? just mill or grind the bolt hole surfaces at an angle?

How did you deal w/the "Vortec to Gen I" port mis-match?

Intake will bolt on with no mods, we are using the Vortec heads from the same year motor. Just the upper intake lid is custom made, Everything else is stock GM bolt on parts. There are so many of these late modal Vortec motors at are local salvage yard you can buy a bad motor complete for $35.00. Take the heads with valve train and lower intake with bolt and scrap the rest. The biggest problem is the smog pump mounting. On the stock crossfire it bolts to the intake. And the EGR valve must be eliminated, it is on the front of the vortec intake manifold in the way of everything.
David

Two questions: how did you deal w/the intake bolts? just mill or grind the bolt hole surfaces at an angle?

How did you deal w/the "Vortec to Gen I" port mis-match?

Intake will bolt on with no mods, we are using the Vortec heads from the same year motor. Just the upper intake lid is custom made, Everything else is stock GM bolt on parts. There are so many of these late modal Vortec motors at are local salvage yard you can buy a bad motor complete for $35.00. Take the heads with valve train and lower intake with bolt and scrap the rest. The biggest problem is the smog pump mounting. On the stock crossfire it bolts to the intake. And the EGR valve must be eliminated, it is on the front of the vortec intake manifold in the way of everything.
David

What do you need an air pump for?

Intake will bolt on with no mods, we are using the Vortec heads from the same year motor. Just the upper intake lid is custom made,

Sorry, my bad. I missed where you clearly said that in the first post. So that makes total sense. Did you swap over the roller cam/lifters and spider plate too? Or keeping the stock CFI/HO cam? I have to say...I'm a little surprised and dissapointed by the 208 RWHP (so far). Please keep us updated. I'd expect quite a bit better than that, after getting it dialed in.

Cool, David. Congrats. A little imagination and Yankee ingenuity will overcome. If the wrong people don't go ape-nutz and ruin it for the masses, you could have a good thing, here. Of course the non-doers, the check writers, will have to find someone to do it for them.

RACE ON!!!

You dont really need the smog pump, but the Customer I'm doing this project for wants to make it look as close to stock as we can so the smog pump has to stay. And it will make it more of a "bolt on" modification for the end product. If it works at all!!
David




What do you need an air pump for?

Pics! Pics!!! :)

Cool, David. Congrats. A little imagination and Yankee ingenuity will overcome. If the wrong people don't go ape-nutz and ruin it for the masses, you could have a good thing, here. Of course the non-doers, the check writers, will have to find someone to do it for them.

RACE ON!!!

Who writes checks anymore? Once in a while I see old ladies write checks in the grocery store. We use a new thing now called paypal. Anyways how much do you charge for this new mod? paypal here!!!

Anyways how much do you charge for this new mod? paypal here!!!

I thought that you already have the "R" intake coming?

I thought that you already have the "R" intake coming?

Just looking for another option if this intake doesn't live up to expectations. Would if there is idle problems or a puddling problem, or if it doesn't work better than a ported intake. I like to look at all the options for my crossfire. It is starting to look like there are alot of options these days:
renegade
x-ram
port stock intake
now this vortec deal

If I liked removing intakes and was really good at it I would try them all and test them with track numbers, but thats to much work and no track near me. So I will wait and see how these other guys do with their renegades and then put the top intake on mine. Who knows I might be in the garage grinding on the stock intake after the smoke clears. I will wait and see what :yoda: thinks of the renegade first.

Photos coming soon, We are working on using a CNC Machined Polyoxymethylene plastic (Delrin) for the upper part of the intake. The friend that is doing the CNC work for me also does work for NASA,Navy and Air Force and NO cameras are aloud in the building, But are First Attempt That Failed should be in my hands in the next few days. I'm trying to get the over all height down to stock and keep good air flow and is being a SOB, The Vortec upper is much taller then the flat Crossfire upper. I will post some photos of it to give you an idea of what it will look like. I have a question for all you 84 owners, Anyone know the max amount of wiggle room between air cleaner and hood on an 84 with old motor mounts. The only 84 we have has new mounts. Also, Tom we are using the stock 84 cam & lifters, Vortec rocker arms and Custom push rods in the prototype, hopefully the 84 push rods will be the right length but not sure yet.
David



Pics! Pics!!! :)

I had about a half inch of clearance on mine. I would offer to check, but I am not running the crossfire anymore..... Maybe someone else can chime in with an exact number but I am positive that I had about 1/2"

Also, Tom we are using the stock 84 cam & lifters, Vortec rocker arms and Custom push rods in the prototype, hopefully the 84 push rods will be the right length but not sure yet.
David
Cool. Thanks for the update. :) This is a good thread, IMO. Nice "X-tech"/

Cool. Thanks for the update. :) This is a good thread, IMO. Nice "X-tech"/

Up Date on Vortec to Crossfire Change Over!. This weekend we are going to run a new program my Machinist has written, With a 24x24x3 inch block of Delrin clamped in to the CNC, after 4 hours of run time a upper intake that will bolt on a Vortec intake and the Crossfire throttle bodies and linkage will bolt to will come out of the CNC ready for testing. Probably going to need some tweaking to get it perfect, but we will see!!
David Steele

use this basic combo
holley tbi 502-6 87-89 chevy 350 direct replacement comes with tps iac, holley tbi intake 300-49 includes throttle brackets, edelbrock egr adpater 1476, 88 chevy 454 tbi gasket, don't use the gasket from the new tbi because its thick & tapered, i used a k&n open element 4bbl. assembly, trimmed it down & RTVed it to the lid, the unused iac connector , i got a used iac & housing off 85 up 2.8L camaro, trimmed it down, tucked into the harness, the computer thinks its still running the old set up it idles better , computer is happy
GOOD POINTS
670 cfm, adj. fpr. bigger injectors 68 lbs. hr.?
throttle & tv cables bolt right on, reuse t-stat housing
SORE SPOTS
no ram air
intake has a boss for the air pump but it aint threaded, can't use rear a/c brace,
tight hood clearence
o-ring fuel lines (A-N adaptors, repair kits, or some chevy trucks had braided fuel lines)
cruise control, grab parts at junk yard that fits throttle arm
OTHER THINGS
85 fuel pump is a must
use a cam that makes good vacuum, 17 inches or more, or you'll waste gas & foul plugs
coat your manifolds/headers
run a hiflo water pump & 195 t-stat, water wetter, a good air dam, & clean up between rad. & cond.
adv. ign. timming, run premium gas
try adj. cam timing also , some really respond to it
3 things hold back an x-fire
stock intake
tbi,s
air filter housing
this combo on a PROPERLY TUNED & HEALTY 350should wake up those vettes
my vette is really responsive & have not had any tuning or chips , good engine vacuum ,timming , good gas, it passsed emissions test ok, then i put a smokey sy1 under that tbi & WOW!!!...

Once you have port matched a stock Crossfire, you can drill an 3/32" hole thru the bottom/side of #5 runner. Then fuel can NOT puddle there. Because it gets sucked into #5 runner.

Once you have port matched a stock Crossfire, you can drill an 3/32" hole thru the bottom/side of #5 runner. Then fuel can NOT puddle there. Because it gets sucked into #5 runner.

Sneaky sneaky, would be cool to have a tiny camera in there to see what the hell is going on inside that crossfire.:beerbang:

Once you have port matched a stock Crossfire, you can drill an 3/32" hole thru the bottom/side of #5 runner. Then fuel can NOT puddle there. Because it gets sucked into #5 runner.

That doesn't make any sense. Did you drill a hole through the floor of the runner? Into the coolant channel or valley? Did you mis-type something? I don't understand what you did...or why you felt the need to.

What evidence did you have to show that fuel ever "puddled" in the first place?

WE STILL NEED PICS of the "Vortec CFI"!! :)

-Tom

GOOD POINTS
670 cfm, adj. fpr. bigger injectors 68 lbs. hr.?
throttle & tv cables bolt right on, reuse t-stat housing
Approx same as the two CFI TBs, possibly slightly larger. Those injectors are nominally the same as the Crossfire injectors. Why would the injectors for one 350 be any significant amount larger than for another 350? The stock Crossfire already has an adjustable fuel pressure regulator.



SORE SPOTS
no ram air
intake has a boss for the air pump but it aint threaded, can't use rear a/c brace,
tight hood clearence
o-ring fuel lines (A-N adaptors, repair kits, or some chevy trucks had braided fuel lines)
cruise control, grab parts at junk yard that fits throttle arm
All easily avoided.



OTHER THINGS
85 fuel pump is a must
Not true.


use a cam that makes good vacuum, 17 inches or more, or you'll waste gas & foul plugs
coat your manifolds/headers
Those aren't problems with a stock or ported Crossfire manifold.


run a hiflo water pump & 195 t-stat, water wetter, a good air dam, & clean up between rad. & cond.
Is proper maintenance more necessary with your set up? Why a special water pump? Why the Water Wetter?


adv. ign. timming, run premium gas
try adj. cam timing also , some really respond to it
Premium gasoline is a waste of money in a 9.0:1 engine, regardless of the ignition timing.


3 things hold back an x-fire
stock intake
tbi,s
air filter housing
Yes.
No.
No.

I applaud anyone that takes the time and has the imagination to improve the performance of their cars, especially where you have to do your own R&D. But not all that is posted here is well documented and is contrary to my experiences.

RACE ON!!!

i've had my 84 since 95 , been doing mods that can be undone. first thing i did was unhook thermal valve on air cleaner, engine did'nt really need it most of the time. even my girlfriend said it ran better. next i made a top in the shape of the air filter with cut outs for the tops of the inj. pods. i could feel another increase. than i took 2 4 cyl. gm air filter housings , cut em up and had a dual quad look. i did'nt have a adj. reg. it ran well but would lean backfire at wot.
around 98 i sent my intake to extrude hone and i was'nt impressed. i had stock injectors & t bodies. not alot of support back then.
i thought up the single 2bbl. tbi about 8 years ago. the cooling system on a stock c4 is barely adequate, the cookie cutter water impeller is a joke. these improvements reduce hot spots and lets you run more timing. every car i've owned responds to more timing, those early 80's heads are not modern like vortecs, premuim gas and a working egr is just insurance.
coated manifolds reduce underhood temps.
i like the single 2bbl. its got alot of air flow out of the box.it was plug & play but i did'nt know if it would work ok. with the open air filter it has a 4bbl. sound & the turbo-fire look under the hood.really i don't think the ram air really helped on these. the boxy look of the stock air cleaner just is'nt sexy enough.
i've been thinking about vortec heads & tbi manifold ,that would make good steetable h.p. but i like that sy1 , nobody knows what you got.
and it sure runs.

i've had my 84 since 95 , been doing mods that can be undone. first thing i did was unhook thermal valve on air cleaner, engine did'nt really need it most of the time. even my girlfriend said it ran better. next i made a top in the shape of the air filter with cut outs for the tops of the inj. pods. i could feel another increase. than i took 2 4 cyl. gm air filter housings , cut em up and had a dual quad look. i did'nt have a adj. reg. it ran well but would lean backfire at wot.
around 98 i sent my intake to extrude hone and i was'nt impressed. i had stock injectors & t bodies. not alot of support back then.
i thought up the single 2bbl. tbi about 8 years ago. the cooling system on a stock c4 is barely adequate, the cookie cutter water impeller is a joke. these improvements reduce hot spots and lets you run more timing. every car i've owned responds to more timing, those early 80's heads are not modern like vortecs, premuim gas and a working egr is just insurance.
coated manifolds reduce underhood temps.
i like the single 2bbl. its got alot of air flow out of the box.it was plug & play but i did'nt know if it would work ok. with the open air filter it has a 4bbl. sound & the turbo-fire look under the hood.really i don't think the ram air really helped on these. the boxy look of the stock air cleaner just is'nt sexy enough.
i've been thinking about vortec heads & tbi manifold ,that would make good steetable h.p. but i like that sy1 , nobody knows what you got.
and it sure runs.
I think we need some visuals.
:useless:

i've had my 84 since 95 , been doing mods that can be undone. first thing i did was unhook thermal valve on air cleaner, engine did'nt really need it most of the time. even my girlfriend said it ran better. next i made a top in the shape of the air filter with cut outs for the tops of the inj. pods. i could feel another increase. than i took 2 4 cyl. gm air filter housings , cut em up and had a dual quad look. i did'nt have a adj. reg. it ran well but would lean backfire at wot.
around 98 i sent my intake to extrude hone and i was'nt impressed. i had stock injectors & t bodies. not alot of support back then.
i thought up the single 2bbl. tbi about 8 years ago. the cooling system on a stock c4 is barely adequate, the cookie cutter water impeller is a joke. these improvements reduce hot spots and lets you run more timing. every car i've owned responds to more timing, those early 80's heads are not modern like vortecs, premuim gas and a working egr is just insurance.
coated manifolds reduce underhood temps.
i like the single 2bbl. its got alot of air flow out of the box.it was plug & play but i did'nt know if it would work ok. with the open air filter it has a 4bbl. sound & the turbo-fire look under the hood.really i don't think the ram air really helped on these. the boxy look of the stock air cleaner just is'nt sexy enough.
i've been thinking about vortec heads & tbi manifold ,that would make good steetable h.p. but i like that sy1 , nobody knows what you got.
and it sure runs.

So your using the SOTP dyno?
You have no real results either dyno or ET?

It kind of sounds like you hacked it up a bit.. maybe I'm wrong but it sounds that way
You also stated that you didn't have a adjustable FR.... last I new all the CFI's had a FR that you could adjust on the back TB

To the OP..

Whats the latest on this project. I'm interested in finding out your results! :thumbsup:

I think we need some visuals.
What do you need pics of? I understand what he did. In fact, I CONSIDRERED many of those same mods, back then too.

It kind of sounds like you hacked it up a bit.. maybe I'm wrong but it sounds that way
You also stated that you didn't have a adjustable FR.... last I new all the CFI's had a FR that you could adjust on the back TB
:iagree: With all of that.

I second the motion for an update! :)

i've had my 84 since 95
So you are a newbie to the Crossfire. I bought mine 9 years earlier.


even my girlfriend said it ran better.
I am going to pass on the obvious "cheap shot" on that one.


around 98 i sent my intake to extrude hone and i was'nt impressed.
A BIG waste of money.


the cooling system on a stock c4 is barely adequate, the cookie cutter water impeller is a joke. these improvements reduce hot spots and lets you run more timing. every car i've owned responds to more timing, those early 80's heads are not modern like vortecs, premuim gas and a working egr is just insurance.
Mine runs at or near the thermostat opening temperature, on the highway. Sitting and idling, the fan comes on and the temp drops until it turns off, then it repeats. How much timing do you want to run? Advancing the timing more than stock can improve performance, but there is a limit as to how much it will take and a point where more, hurts. "premuim gas and a working egr is just insurance.". Premium gas is insurance against WHAT? Your wallet over flowing?

They never built a Crossfire that wasn't equipped with an adjustable fuel pressure regulator.

I have to agree with the others, it does sound like it may be somewhat hacked. What kind of ETs does your girl friends time slips say it runs?

RACE ON!!!

Any up date on this project David?

-Tom

any up date on this project david?

-tom

how about your project of the ported crossfire manifold bolted to the heads of a $35.00 junk yard vortec 350 engine? I have to say, it pulls pretty strongly. I predict 14.50s at 4200', this friday.

Race on!!!VORFIRE

We have done 4 chassis dyno pulls on the test car with the best of 208 RWHP are stock base line motor (84 Corvette/auto trans with 98674 miles on it) .

On the first post I saw this and started to wonder what kind of stock 84 CF motor you were using with these numbers since the stock 84 CF is 205hp at the crank. So after 98K+ on the motor, you got 3 more hp at the rear than the motor was rated at the crank...right? I just want to make sure I'm reading all this correctly or is this not a stock 84 CF motor? Thanks for clarifing.

I'd be interestd to hear a little more about that too. I DON'T DOUBT that a "stock CFI motor" can pull 208 at the wheels; free mods (optimizing), & exhaust, I believe would get you there easy. But certainly no CFI "off the street" woudl lay down those kind of numbers, that's for sure.

This thread needs an update! :thumbsup:

-Tom

Vorfire? A crossfire intake will not bolt up to a engine w/ vortec heads(some have dual patterns but not the cheap truck heads), the op was talking about the vortec intake from 96-00 trucks, it is a cross ram style intake that had an internal fuel injection. He was getting rid of the bumps, ridges, & holes thats on the intake from the factory.

Vorfire? A crossfire intake will not bolt up to a engine w/ vortec heads

It won't? We just did it this weekend. CFI intake on a '98 Vortec 350 long block.

I know that's not what the OP was talking about though. I revived the thread, b/c going into the weekend, I wasn't sure HOW I was going to address the Vortec/Gen "I" mismatch...as I had never seen it first hand. ONE of the possiblities in my mind, was what the OP has STARTED this thread on. So I was looking for an update. As it turned out, turning the Vortec manifold into a "CFI" is much more difficult (but doable) than turning a Vortec longblock, into an Vorfire/Crosstec. The Vortec longblock is currently running sweet in the '84 'Vette, fed by a stock, ported CFI intake system.

Vorfire? A crossfire intake will not bolt up to a engine w/ vortec

"they don't know what's going on with that engine, it's all a bunch of monkey see-monkee do"
YOU DON'T KNOW WHAT IS GOING ON WITH THAT ENGINE AND " it's all a bunch of monkey see-monkee POST"

SEE THE POST BY TOM400CFI BELOW. HIS STATED PROJECT INVOLVES MY PROVEN HOME PORTED CROSSFIRE INTAKE MANIFOLD ON TO HIS 1998 TRUCK VORTEC ENGINE INO MY MUCH RACED 1984 CORVETTE.

RACE ON!!!

THE VORFIRE LIVES AND BREATHS!

My signature is from a movie quote I like, what's the big deal? I can tell when cfi-efi get angry, he hits the caps lock button, another quote for you, watch the end of Gone with the Wind. See ya.

My signature is from a movie quote I like, what's the big deal? I can tell when cfi-efi get angry, he hits the caps lock button, another quote for you, watch the end of Gone with the Wind. See ya.maybe you can tell when the stroke that affected my left side makes it impossible for me to operate the"shift " key and I leave the caps lock on. if your favorite quote doesn't fit your post, maybe you should omit it where it makes the wrong statement. don't make it my fault for not being familiar with your sig. if it doesn't apply, don't post it.

race on!!!

maybe you can tell when the stroke that affected my left side makes it impossible for me to operate the"shift " key and I leave the caps lock on. if your favorite quote doesn't fit your post, maybe you should omit it where it makes the wrong statement. don't make it my fault for not being familiar with your sig. if it doesn't apply, don't post it.

race on!!!

You have had a stoke too? I am wheel chair bound.:wheelchair: But my nurse is a big help. Do you have in house care?

Sorry a little off topic.

Sorry a little off topic.

That's O.K. We're used to that with you.

You guys still running the new vorfire tomorrow?

Yep. He's going to have to figure a new dial in two runs (!), and then hopefully he'll win most of the rounds (if he does what he usually does), so as to get a decent number of passes and some meaningful data. I can't wait for the numbers to show up on the board. Again, I don't have high expectations for any improvement...just curious and eager to see what the real numbers say.

I need to get cracking on this raised runner intaked more than ever. Now, it's a perfect candidate and solution for the Vortec head.

Yep. He's going to have to figure a new dial in two runs (!), and then hopefully he'll win most of the rounds (if he does what he usually does), so as to get a decent number of passes and some meaningful data. I can't wait for the numbers to show up on the board. Again, I don't have high expectations for any improvement...just curious and eager to see what the real numbers say.

I need to get cracking on this raised runner intaked more than ever. Now, it's a perfect candidate and solution for the Vortec head.

I think once Jim gets it dialed in it should perform quite well.I would think that maybe shaving off .2 tenths isn't unreasonable.
I don't even know... what fuel pressure to the TBI trucks run at? Is it about the same as the CFI?

IMO, this build is exciting! Normally you see intakes ported or swapped and still using the Gen 1 long block. But in this case its just the opposite. Maybe more potential. Just think how easily you can know swap in a roller cam

I would also assume that his ported intake can outflow the stock TBI . So there may be a possibity that he's making more than the 255 at the crank.

Damn this sounds like fun.. and even better if I could make it to Utah tommorow....

i think once jim gets it dialed in it should perform quite well.i would think that maybe shaving off .2 tenths isn't unreasonable.
I don't even know... What fuel pressure to the tbi trucks run at? Is it about the same as the cfi?

Imo, this build is exciting! Normally you see intakes ported or swapped and still using the gen 1 long block. But in this case its just the opposite. Maybe more potential. Just think how easily you can know swap in a roller cam

i would also assume that his ported intake can outflow the stock tbi . So there may be a possibity that he's making more than the 255 at the crank.

damn this sounds like fun.. And even better if i could make it to utah tommorow....

come on down, i could use some help swapping tires.

Race on!!!

I don't even know... what fuel pressure to the TBI trucks run at? Is it about the same as the CFI?

Truck TBI's run ~12ish PSI like the CFI. This isn't the TBI "Vortec" though. This is the '96-'99 MPFI Vortec engine that came w/the desirable L31/Vortec heads, and was factory rated (in the truck) at 255 hp. Here is a pic of the L31 Vortec engine:

http://farm2.static.flickr.com/1097/1188134689_577e25664d.jpg?v=0

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/waterpump.jpg

The Vortec intake LOOKS like a "barrel ram" intake, but it's not. Under the plastic upper, which it just a plenum, is a cross ram intake lower, but w/port injection.

We removed the MPFI intake and injection and installed the CFI in it's place. What CFI-EFI got out of the deal was:
*Great flowing Vortec heads
*4 bolt mains
*PM rods
*1/2 point of compression
*Roller cam (Albeit, smaller than a stock CFI cam)
*1 pc RMS
*4 tooth crank trigger & sensor for future use and better timing accuracy
*no more burning oil! :)

How will it play out? We'll find out in a few hours I hope.

Truck TBI's run ~12ish PSI like the CFI. This isn't the TBI "Vortec" though. This is the '96-'99 MPFI Vortec engine that came w/the desirable L31/Vortec heads, and was factory rated (in the truck) at 255 hp. Here is a pic of the L31 Vortec engine:

http://farm2.static.flickr.com/1097/1188134689_577e25664d.jpg?v=0

http://i40.photobucket.com/albums/e227/mykk/Project%20383ci/waterpump.jpg

The Vortec intake LOOKS like a "barrel ram" intake, but it's not. Under the plastic upper, which it just a plenum, is a cross ram intake lower, but w/port injection.

We removed the MPFI intake and injection and installed the CFI in it's place. What CFI-EFI got out of the deal was:
*Great flowing Vortec heads
*4 bolt mains
*PM rods
*1/2 point of compression
*Roller cam (Albeit, smaller than a stock CFI cam)
*1 pc RMS
*4 tooth crank trigger & sensor for future use and better timing accuracy
*no more burning oil! :)

How will it play out? We'll find out in a few hours I hope.

FLASH FORWARD A HALF A DAY.
I WAS REALLY EXPECTING, HOPING FOR A 14.50. THE WEATHER STATION WAS CALLING FOR A 13.95 FROM THE OLD CROSSFIRE WITH THE 7573'DA AIR WE HAD FOR THE FIRST TIME TRIAL. SOMW ONE PREDICTED 18s? MY 60 FOOT TIMES HAVE ALWAYS BEEN CONSISTENT AT 2.00. THE CAR FEELS LIKE IT EXPLODES OFF THE STARTING LINE. FIRST ROUND IT POPPED A 1.964 60' AND BEAT AN 18 BY 4 PLUS SECONDS... NO 14.50 IT RAN A 14.42, FIRST CRACK OUT OF THE BOX. TYPICALLY MY FIRST RUN IS THE SLOWEST, BECAUSE THE PLUGS WERE ALWAYS OIL FOULED IN THE OLD CROSSFIRE ENGINE. NOT SO IN THE VORFIRE. I NOTICED IT REALLY PULLED HARD IN THIRD GEAR. APPARENTLY MY HOME PORTED CROSSFIRE IS CAPABLE OF SUPPLYING QUITE A BIT OF AIR FLOW TO THE VORTEC 350 LONG BLOCK. THE SECOND TT YIELDED ANOTHER SUB 2 SECOND 60' OF 1.943. THE ET WAS A SLOWING 14.597. THE WEATHER STATION SAID TO DIAL A 14.57, WHICH SEEMED REASONABLE, SO I DID. I WAS LINED UP AGAINST A SLOWER CAR DIALED AT16.74 SO HIS TREE STARTED 2 PLUS SECOND BEFORE MINE. I TOOK.127 OF THAT BACK WITH A .131 TO.004 HOLE SHOT.WHEN I CAUGHT HIM, I HIT THE BRAKES, BUT NOT HARD ENOUGH. I BROKE OUT WITH A 14.53 ON A 14.57 DIAL. I HIT THE BRAKES HARD ENOUGH TO SCRUB OFF 10 MPH, BUT NOT ENOUGH ET. MAN! THAT VORFIRE JUNPS OUT OF THE HOLE AND PULLS HARD.YOU SHOULD HAVE DROPPED BY, ED, IT WAS A BLAST.

RACE ON!!!

I wish I could have... sounds like a good night to be. Only problem is that I'm about 2 thousand miles away..:rofl:

I like the times very reasonable if you ask me. Think it will get better for you as time goes on.

2 years ago I was running between 14.2 and 14.4 with Xram,stock gears,2000 stall,heads/cam combo.

IMO cost vs cost your project is a better deal...:thumbsup3:

Question for Jim:

Why would your weather station call for a 13.95 from your old combo? That doesn't make any sense. Don't you mean that is was calling for a 14.95 on a 7573 DA? That would make more sense to me.

Car did run good, and especially so considering that we haven't done squat w/the FP, timing or driving. I believe that there are several more 10ths in the car with timing/fp tinkering and lowering of the shift points. Jim is still making the 1-2 shift North of 6k and that is WAY too high on that cam. We're going to try to throw it on a dyno next week, dial it in a bit and see what the tq curve looks like, then plug the numbers into my "Optimal shift points" spread sheet and see where he should REALLY be shifting. :)

But yeah...it ran GOOD. Better than I really expected.

Folks, keep in mind that this 14.42@92 is two significant things: its about a .5sec./4 mph improvement over his recent averages, and its a mid 13 at ~100 at or near sea level. Stock ported intake, stock ECM and chip.

Congrats on the times CFI, looking forward to see how many more tenths you can ring out of her with some more tinkering and some optimal shift points!!!

congrats on the times cfi, looking forward to see how many more tenths you can ring out of her with some more tinkering and some optimal shift points!!!

thanks, gator, me too!

Tom, i agree with what you said about the weather station. 13.95 doesn't make sense, but that is what it said. I showed it to several people. I guess my old home ported stock crossfire casting flows pretty well! I'm pleased!

Race on!!!
Vorfire

the weather station. 13.95
Race on!!!
Vorfire


What is the weather station? Something electronic?

What is the weather station? Something electronic?

the weather station reads the ambient weather conditions, temp, humidity, barometer and calculates the density altitude. after every run, I enter my 1000' ET and 1/4 mile ET, it then predicts my ET for dial in purposes based on the current weather before every run. it can be a useful tool for bracket racing, especially if you have a consistent car. i don't.

race on!!!