ZaneO, I wasn't refering to you about the subject change, I was talking about those who were discussing whether the computer would change the fp.

IDOXLR8 & norcalstreet, thanks for the brand names. I'll do some research and see which of those are more popular. Thanks.

 

i use a holley

 

I know, I was just messing with you.

 

whats the word on the 93 AFPR...i am looking to buy one....

 

the 1993 does not companste for an AFPR, My friend uses one and gaind ~10rwhp and 16rwtq with it a year ago and still has the same power when he dynoed it a week ago.

 

I used an AFPR on my 93 383 LT1. Gained 20+rwhp.

On 94+ cars the PCM compensates so its useless.

 

name brand,location to buy one and price please

 

Aeromotive.

info@sybersport.com

Tell Darren that Grip sent you and he will give you a wicked deal.

 

Is there anyway to adjust it for best performance without a dyno? For those with 93's that have installed one, what pressure worked best for you, maybe that will get me close should I get one.

 

It'll be a different PSI for different cars depending on your mods.

You can go to a track and see what works best for you or use one of the new GTECH Pros.

 

I have a holley one on my 93 that I got from Thunder racing. It's a very nice piece and not to hard to install.

 

Umm... the chances of the PCM compensating are small, ussually at cruise your in the 120blm anyways for long term, as long as your adjustments don't go over 128 the PCM won't carry the BLM's over when you go to WOT, in 94+ if you tune the PCM so that at WOT it locks to 128 BLM then you can fiddle with the AFPR & the PCM even if it sees the difference at cruise won't carry over the added % to WOT. At WOT your PCM has no idea if your running lean/rich or what fuel pressure your running, basicly it'll see it at cruise because the o2's will read leaner causing the PCM to add fuel, when it does this it will show you BLOCK LEARN, which is BLM, anything over 128blm it carries over to WOT as mentioned, so if you were at 140blm driving around & at that point you got on the throttle it'll carry the extra 12blm over to WOT which would partially compensate for your fuel adjustment, but thats not always the case, you might of been at 115 blm cruise before the AFPR & you went WOT & it just ignored the BLM because as mentioned anything below 128 it doesn't carry over cuz that would be like subtracting fuel. So say now that you adjusted your AFPR & gained 15RWHP & 20RWTQ on the dyno by going leaner, so now instead of 115blm cruise you are at 125blm cruise, still within the 128 carry over block, so you gained a solid 15rwhp & 20rwtq & that will never change, but if you were at 128 blm cruise before leaning her out & now you ended up with 140blm, well guess what, it compensated.


Now, if you added fuel, say you needed to add fuel at the dyno to get your power, well chances are you cruised at 128 or below, by adding fuel pressure you got that 128 to say 120 blm, this means that the computer is now subtracting fuel at cruise, when you go into wot none of this will be compensated for.


Or just go into LT1 edit & LOCK your BLM's at WOT there is that feature in there, now you'll never carry anyting over & you can play with the AFPR all you want & your WOT won't be effected, & cruise will be which is what you want cuz the o2s will pick it up. Remember, o2s are ignored by the PCM when you go into WOT, I belive this is 66% TPS for a stock tune & above for 1500rpm & 30% TPS at 5000rpm.

Reason they say 93's are uneffected is because I belive their stock tunes have a 128BLM lock to begin with for WOT.

bla bla bla, hope it makes a bit of sense.

 

I think you're slightly off on that, the computer doesnt adjust FP. The computer adjusts the injector pulse width time to shorter times if the FP is higher and shortens PW time if FP is lowered. If any car has an AFPR and has their FP set to.. lets say 45 PSI, its going to stay that way. The computers just going to adjust the injector on times.

FP is basically whatever the regulator is set on wheather its a 93 or newer Z... Pulse width will get adjusted on 93 and newer Z's as well. Thats the biggest most important thing the computer does
(Bunker may be right though that 93's are locked to 128, but my computer seems to lock at 128 at WOT too, yet the PW changes on my injectors at WOT from time to time so i have no idea whats up with that lol, i have a 95)

 

im not going to argue engine management protocol per said year...all i know is

when im under load(cough, cough)...i want a higher psi for the "plate"...

so aeromotive or holley.........??

 

I read here that many people think AFPR is a waste of time and money because the 94-97 pcm will compensate back to stock.
But what if you are using SVO 30# injectors which are rated @ 39psi where GM's are rated @ 45 psi wouldn't an adjustable FPR be needed to reduce the fp to the SVO injectors?
Otherwise it would cause the car to run rich, is this correct?