Question about EGR/Tune.

5230 Views 10 Replies 6 Participants Last post by vetteoz, Oct 31, 2012

VetteAholic

Discussion Starter · Oct 5, 2012

After doing some research, I've read that some people delete their EGR system and all is fine. Other says that you need to richen up your tune when you delete EGR.

I will probably be getting my C4 tuned by the end of this month or the next.

Does anyone know if it could be possibly to tune the car with the EGR pipes in place minus the actual EGR valve and blocking the holes on the intake manifold?

I ask because I could easily remove the EGR valve and block the holes on the intake manifold, though I might not remove the pipes on the headers right away.

To clarify myself on why I want this. I'm not doing this for any power gain, I'm doing this for easier removal to certain parts when I perform mechanics on my car. Last year I damaged my coolant crossover pipe because I was too busy trying to get the EGR pipe out the way to change my passenger side valve cover gasket! (Long story short, I turned a simple gasket change into a mission changing crossover pipe, it worked out)

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Theo

· #2 · Oct 13, 2012

I bought my Vette some time ago with the EGR removed. I am not sure if any setting was changed but I am sure the MAP sensor should adjust accordingly?

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Seabee 86

· #3 · Oct 13, 2012 (Edited)

I deleted my EGR with no ill side effects other than a cleaner engine bay; which isn't ill to any extent. Check your emission laws first. Mine is also an 86, yours is much newer.

People tell you you will need a new prom chip to prevent knocking when under a load or harsh driving conditions. My argument to that is this: the EGR valve is shut off under harsh driving conditions. Your car may run a little rich but if you're not adverse to slightly poorer gas mileage and changing your plugs slightly more frequently, let 'er rip.

I would always prefer to run my car slightly rich before any bit lean. Lean is mean.

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VetteAholic

Discussion Starter · #4 · Oct 13, 2012

Thanks! I may not do it after all, will be looking forward to a C5. I think I've had enough of this LT-1 motor lol.

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Seabee 86

· #5 · Oct 14, 2012

C5's are ugly. For a fraction of the C5 you can buy a new motor online :thumbsup:

At least that's what I'd do. I love the C4's.

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VetteAholic

Discussion Starter · #6 · Oct 15, 2012 (Edited)

Seabee 86 said:
C5's are ugly. For a fraction of the C5 you can buy a new motor online :thumbsup:

At least that's what I'd do. I love the C4's.

Funny that at first I didn't really like the C4 generation. After riding in my friends then buying mine, love the C4's. I love my C4, will hate to let it go but right now a C5 for me is my best option.

I've thought about swapping an LS1 in it but I don't have that money laying around to dive into the project and have it sit for some time. It'll be better for me to buy a whole package and pay it slowly. C5's have always been my fav. gen.

. C6 is one sweet car but not willing to make those payments as I'd be left flat broke paycheck to paycheck haha

Right now I have a company car, in the future I am planning to switch jobs. I'll need something more reliable, C5 is my calling right now. In the future I would love to buy another C4...same exact color. Plus working on a LS1 is a dream compared to an LT-1....

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Seabee 86

· #7 · Oct 23, 2012

I can imagine. Best of luck to you, it will be a shame to lose another level headed person in the C4 section. For some reason it can get infested with stupidity from time to time.

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Seabee 86

· #8 · Oct 23, 2012

And ironically I feel like you do. At first I was, "ehh" on the C4. Now I'm in love I think they're the best.

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95vette

· #9 · Oct 23, 2012

While I miss my C4, especially right after the engine upgrade, I do like my C5 better.
No rattles and easy to get in and out. Then the HUD, memory seats, nav system and other creature systems are nice, but so is the 475hp under the hood and race suspension. Looks pretty nice too.

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toobroketoretire

· #10 · Oct 24, 2012

VetteAholic said:
After doing some research, I've read that some people delete their EGR system and all is fine. Other says that you need to richen up your tune when you delete EGR.

I will probably be getting my C4 tuned by the end of this month or the next.

Does anyone know if it could be possibly to tune the car with the EGR pipes in place minus the actual EGR valve and blocking the holes on the intake manifold?

I ask because I could easily remove the EGR valve and block the holes on the intake manifold, though I might not remove the pipes on the headers right away.

To clarify myself on why I want this. I'm not doing this for any power gain, I'm doing this for easier removal to certain parts when I perform mechanics on my car. Last year I damaged my coolant crossover pipe because I was too busy trying to get the EGR pipe out the way to change my passenger side valve cover gasket! (Long story short, I turned a simple gasket change into a mission changing crossover pipe, it worked out)

There is no gain whatsoever by deleting an EGR valve because it completely closes (and stays closed) at full throttle because it's vacuum operated. An EGR valve along with the rest of the emission equipment has no effect on the engine's power output.

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vetteoz

· #11 · Oct 31, 2012

Seabee 86 said:
I deleted my EGR with no ill side effects

Same here

Seabee 86 said:
People tell you you will need a new prom chip to prevent knocking when under a load or harsh driving conditions.

Not for a engine performance problem but to get rid of the SES light.
When the ECM ( with stock tune ) operates the no longer functioning EGR valve and doesn't see it operate it throws a code 32 ; EGR fail
Some people get the code ; some like me don't
Disabling the EGR operation on the tune solves that problem because the valve is never commanded to operate ; hence no code thrown

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