Just wondering if this is going to be necessary to do? Want to make sure that this baby is running tops for the hot season!

Nothing is changing on the car outside of putting a marginally smaller load on the engine. Nothing will be affected that calls for a tune.

....but....if it is tuned stock right now, you'd see better gains from spending that money on a good tune, and you could lower the fan temps a bit to get the car to run a bit cooler with a new t-stat...then youd have more power and better cooling, and it would cost about the same as the waterpump, which by itself will offer little to no gain in performance or coolant temps.

Thanks
Mike

....but....if it is tuned stock right now, you'd see better gains from spending that money on a good tune, and you could lower the fan temps a bit to get the car to run a bit cooler with a new t-stat...then youd have more power and better cooling, and it would cost about the same as the waterpump, which by itself will offer little to no gain in performance or coolant temps.

Thanks
Mike

I agree 100% Get it done for optimal performance!

Im not a fan of tuning an otherwise stock engine for no reason but to pick up 15-20rwhp. Nobody can tune that car better than GM and what they did to it is what makes them last 100k+ miles. Not to mention how much you get charged for a tune. If you really want to do one then wait till you are content with whatever modifications you want to do. The tune is going to cost you the same amount regardless.

I agree and disagree, I agree that you should wait IF you are planning any HP mods. However the factory has to put a tune on these cars that will run acceptably all over the world, various altitudes, temps, octane ect... and if you have an automatic a custom tune on a stock ride makes even more sense. Just my .02!!

If you are going to mod later I agree with Tim, wait for a tune. If not, tune away! You definitely won't be sorry and you will get the greatest benefit out of the water pump / fan settings with a tune.

Just wondering if this is going to be necessary to do? Want to make sure that this baby is running tops for the hot season!

I notice you live in Florida where weather temps are HOT which leads to performance problems not seen in other parts of the country.
It is more about a package deal to really pull the heat out as the hotter air and engine is the more performance is lost.
Electric pump itself will not solve the problem and may not even work well at idle and slow speeds.

Tuning alone will not solve it either.

Best case is a better flowing radiator, lower temp Tstat, oil cooler, cold air box for aircleaner and a decent custom tune.

There is no sense trying to cool the water when the oil is too hot and dumping that heat back into the engine and water.
A decent 3rd party radiator will flow about 40% more volume and handle spikes of heat real easy.
Using less antifreeze ratio as water transmits heat out much better.

Using a bit larger fuel injector as leaner AFR is the hotter cylinder temps are. With PCM tuning of larger injectors will help keep temps lower.

Im not a fan of tuning an otherwise stock engine for no reason but to pick up 15-20rwhp. Nobody can tune that car better than GM and what they did to it is what makes them last 100k+ miles. Not to mention how much you get charged for a tune. If you really want to do one then wait till you are content with whatever modifications you want to do. The tune is going to cost you the same amount regardless.

GM has to come up with ONE PCM calibration for all weather conditions, driving styles, where to sealevel, many types of gas makeups, etc, so their tune is good for overall use but not to where it meets your car and worse the mods it might have.

I have tuned well over 1,000 C5s and those that were almost stock still gain about 30 HP and even better overall torque.
Add tuning for where car is located and how it is driven and add all the other changes done in a custom tune and the end results is the car performs much better then in stock PCM calibration.

It is interesting is people will spent $400-$500 for some fancy named aircleaner but assume that every engine/car can perform well with a stock cookie cutter calibration.
What is a waste of time is those "Canned" blind tunes.

GM has to come up with ONE PCM calibration for all weather conditions, driving styles, where to sealevel, many types of gas makeups, etc, so their tune is good for overall use but not to where it meets your car and worse the mods it might have.

I have tuned well over 1,000 C5s and those that were almost stock still gain about 30 HP and even better overall torque.
Add tuning for where car is located and how it is driven and add all the other changes done in a custom tune and the end results is the car performs much better then in stock PCM calibration.

It is interesting is people will spent $400-$500 for some fancy named aircleaner but assume that every engine/car can perform well with a stock cookie cutter calibration.
What is a waste of time is those "Canned" blind tunes.Was about to quote this and agree 100%...until the last statement, which is something of a shot at us....

Understand, we do not market these canned tunes toward the guy with heads and cams, or any application where tuning the VE tables should be done. That is why we have dealers with our CMR tuning software.
We do design the canned tunes around a stock car with minor bolt ons that should not require extensive tuning.
These tunes have proven themselves to make good power in cars all over the country (world) with no ill-effects.
Plus a nice tool like the Predator gives the end user the ability to make simple changes to the tune to dial it in to their specific combo of parts, like fan settings, rev limits, shift points/firmness for autos, WOT fuel and timing adjustment, etc, without the need for a laptop or having to hunt down their tuner every time they need to make a change or go back to stock if they need to go to the dealer....

Thanks
Mike

A *stock* Vette doesn't necessarily need a cooling system change/upgrade unless the stock system is clogged or having other issues to begin with.

A tune will benefit any car regardless of the application. Remember GM has to fit their tune within a bell curve of engines and pick one that fits all. An aftermarket tune can take advantage of everything your engine can provide and will be custom to your engine.

Changing injectors on a *stock* application is completely unnecessary as the stock injectors will support up to 400 HP quite reliably. I have no idea how you can have cooler running temps from bigger injectors? :rolleyes: It's actually hotter here in the SF Valley than southern Florida, we just don't have the humidity. :lol:

A Meziere will flow more water at low speeds (driving around town) than a stock pump. We have used them with success on many Vettes though.

A *stock* Vette doesn't necessarily need a cooling system change/upgrade unless the stock system is clogged or having other issues to begin with.

A tune will benefit any car regardless of the application. Remember GM has to fit their tune within a bell curve of engines and pick one that fits all. An aftermarket tune can take advantage of everything your engine can provide and will be custom to your engine.

Changing injectors on a *stock* application is completely unnecessary as the stock injectors will support up to 400 HP quite reliably. I have no idea how you can have cooler running temps from bigger injectors? :rolleyes: It's actually hotter here in the SF Valley than southern Florida, we just don't have the humidity. :lol:

A Meziere will flow more water at low speeds (driving around town) than a stock pump. We have used them with success on many Vettes though.

Not true,
if the ole wise tale that stock injectors would handle 400 HP then why does a C5 Zo6 use 28 lb/hr injectors, the C6 uses 32 lb for LS2, 40 lb for C6 Z06 and 48 lb injectors for ZR1.

Reason they used smaller injectors is better control with longer injector pulse width on times with the slow 17 Mhz CPU in PCM.
A simple change of installing LT headers where O2 sensors are moved further downstream causes LEANER AFR reported and forces stock injectors to run 90 % duty cycles

Basics, why does GM during WOT go way rich ?
Simple more fuel in cylinders reduces temps. The word Pig Rich with the C5s did not come about for no reason

Anyone putting a OBD-II scanner on car and doing hard pulls and knows how to obtain the injector duty cycle will see in most cases the duty cycle way over the standard rule of not forcing injector to run static over a 80% DC.

Anything beyond this will just become an argument for no reason. He can make his decision about whether to get a tune or not based off whats already here. Im sure you are great tuners. Everyone has their own ways is all.

Anything beyond this will just become an argument for no reason. He can make his decision about whether to get a tune or not based off whats already here. Im sure you are great tuners. Everyone has their own ways is all.

I will say this has been a good post to read. Interesting enough I agree with TCR-02, it seems its getting warm in here!

Not true,
if the ole wise tale that stock injectors would handle 400 HP then why does a C5 Zo6 use 28 lb/hr injectors, the C6 uses 32 lb for LS2, 40 lb for C6 Z06 and 48 lb injectors for ZR1.

Reason they used smaller injectors is better control with longer injector pulse width on times with the slow 17 Mhz CPU in PCM.
A simple change of installing LT headers where O2 sensors are moved further downstream causes LEANER AFR reported and forces stock injectors to run 90 % duty cycles

Basics, why does GM during WOT go way rich ?
Simple more fuel in cylinders reduces temps. The word Pig Rich with the C5s did not come about for no reason

Anyone putting a OBD-II scanner on car and doing hard pulls and knows how to obtain the injector duty cycle will see in most cases the duty cycle way over the standard rule of not forcing injector to
run static over a 80% DC.

80% DC is an old myth and you just repeated it. :rolleyes: :rofl:

Since you have no signature and no location how do we know you are credible? :toetap05: It's a reasonable question.

Why does GM use larger injectors (http://delphi.com/manufacturers/auto/powertrain/gas/injsys/multecmpfi/)on the LS2 than the LS6? Very simple, the LS2 has close coupled catalysts and need the extra fuel to keep the cats cool during catalyst over temperature (COT) events. It's certainly not because the 400 HP in an LS2 is more than 405 in an LS6.:lol: Yes, GM does care about their emissions warranty that's why they run them so rich in COT with close coupled cats.

Injector linearity (http://delphi.com/manufacturers/auto/powertrain/gas/injsys/multecmpfi/) and spray pattern is another reason the LS2-LS7-LS3-LS9 can get away with larger injectors without an emissions penalty. And yes, the LS2+ ECM's were faster than their predecessor PCM's in the LS1 series. Oh, don't forget, the ECM's in the C6 only handle the engine side of things. GM chose to go with a TCM for the transmissions to spread the processing load around. :D

BTW: 17 MHz isn't exactly *slow* compared to the engine that the PCM is trying to control. You only need enough MHz to run the code at hand. Slow was the TBI and earlier computers at 2 MHz and they managed engines pretty well for an 8 bit slug of a processor that *was* slow. How many TBI trucks went well over 200K before the engine was simply worn out?

:cheers: