CAI,headers, ORP,cam, ported/aftermarket heads, roller rockers, cutout, weight reduction, electric water pump, among others.

 

well there was a post on this thread rebuking the tb bypass and there have been other post discrediting the 160 temp and there have been others that have said that you get better performance having a cat on the exhaust. I agree with all those mods that they have helped my 95z but when there is so much negativity towrds these mods it makes people like me wonder if these mods are legit

 

Good list, though ORP gains on a stocker with the rest of the exhust stock are pretty nonexistent. Now, if you do the headers first it's another thing.

BTW: I hardly remember even starting this thread!

 

Now thats what I call a long thread.

 

dont forget bigger valves in those heads, that makes a bit of a difference

 

i cant belive i read all 8 pages. i must have a problem. question about the fuel pressure regulator thing: i agree that the computer (without a custom tune) will re learn and adjust pulse width BUT with the higher pressure might there be some gains from atomization?? or would your 3 dollar bottle of chevron with techron fuel injector cleaner do the same thing to the stockers??

 

Well rich once again you are GOD
thanks for the geat Info I was wondering about someof that stuff and that cleared t all p for me.

By the way this is a DAM LONG POST he hehe
Lets shoot for 300 replies



later,
-JOhn

 

from what ive read, usually you lean the car out a little by dropping the fuel pressure, but the computer will see the lean condition and lenghtn the pulse width on the injectors to richen it up. Again im not 100% sure on that, but that is my understanding

 

The stock LT1 calibration is a little rich. So, an AFPR can be used to gain hp in the following way. If you drop the FP, the car will run leaner temporarily, until the PCM has time to learn. There are people who lower their FP when at the track and disconnect thrie PCM momentarily prior to each run.. In so doing, they prevent the computer from compensating for the leaner mixture. Raising the FP will temporarily make it run richer. Since it's already rich, this will decrease power.

Rich Krause

 

Disconnect the PCM? What the heck do you mean by that. I completely understand the FP aspect. But how do you "disconnect" the PCM?

 

"Disconnect" is what I said, not what I meant. You just interrupt power to the PCM by pulling the fuse. This clears the volatile memory, where the block learns are stored. Of course, disconnecting it would work to, but that isn't necessary. Disconnecting the battery accomplishes the same thing.

Rich Krause

 

Wouldnt increasing or decreasing the fuel pressure with an AFPR have a permanent effect on WOT (PE mode) that wouldnt be compensated for by the PCM because the O2s are ingnored at WOT or am I missing something here.

 

AFAIK, your WOT tables are a factor applied to what your closed loop fueling is doing at the time it goes into WOT. So lowering your f.p. would only affect your WOT fueling for as long as it was affecting your closed loop fueling. Short term blm's correct very quickly, within seconds, long term blms follow right behind them.

 

As far as I am concerned.. there is gain or should I say difference to be had/seen with an AFPR if you tune where to be lean from factory.. the more pressure you run the richer you get if your blms are unde 128. It will not compensate at WOT for a rich condition... BLMS at WOT will go 128 and will add fuel as per inj constant, maf, Pe and others... so If you get lots of pressure you (loose power) get richer but it will not get back leaner... AFPR can help if you have a few mods, cant tune pcm but need your WOT richer at some point...

Another thing is that depending on how it is at WOT with the blms positive you will get leaner if those blms fall very near but under 128...

The dyno effects will be negated becase the BLMs are a bit lean and they get leaner when you drop the pressure thus correct for the lean condition in WOT.. But it will not correct for rich condition in WOT... The O2s are ignored and the blm learning is DISABLED. So, a blm of 118 before WOT will NOT remove fuel from WOT.

And another thing.. I do gain power from upping the timing tables on a TOTALLY stock car...