Adjustable fuel pressure regulator?
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: Adjustable fuel pressure regulator? (95AquaC4)
Aqua,
They don't do anything for the SFI Vettes (94-96). The PCM will tune out any advantage within a few miles of part throttle driving. If your stock FPR is working fine, don't bother.
Eric
They don't do anything for the SFI Vettes (94-96). The PCM will tune out any advantage within a few miles of part throttle driving. If your stock FPR is working fine, don't bother.
Eric
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Re: Adjustable fuel pressure regulator? (silver & red CE)
I did not know this.
Aqua,
They don't do anything for the SFI Vettes (94-96). The PCM will tune out any advantage within a few miles of part throttle driving. If your stock FPR is working fine, don't bother.
Eric
They don't do anything for the SFI Vettes (94-96). The PCM will tune out any advantage within a few miles of part throttle driving. If your stock FPR is working fine, don't bother.
Eric
Le Mans Master
Joined: Aug 2001
Posts: 8,107
Likes: 0
From: California
St. Jude Donor '05-'06-'07-'08
Re: Adjustable fuel pressure regulator? (Lone Ranger)
Check it out:
http://www.ws6.com/mod-7.htm
Dyno graph and discussion of this mod. The computer compensates for the lower pressure by extending injector pulsewidth.
Any way around this? Looks like leaning the mixture provides for some nice numbers!
http://www.ws6.com/mod-7.htm
Dyno graph and discussion of this mod. The computer compensates for the lower pressure by extending injector pulsewidth.
Any way around this? Looks like leaning the mixture provides for some nice numbers!
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: Adjustable fuel pressure regulator?
I think you can mitigate this by disconnecting the o2 sensor at the track.
Any way around this? Looks like leaning the mixture provides for some nice numbers!
Eric
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Burning Brakes
Joined: Feb 1999
Posts: 1,157
Likes: 3
From: Encino CA
Re: Adjustable fuel pressure regulator? (silver & red CE)
Another thing to consider. The instructions I got with the TPIS regulator also suggest turning the pressure DOWN but I suspect this is for best performance at the strip (i.e., WOT condition). My car is just a daily drive and has never seen the strip but I, mistakenly, tried running at a lower-than-stock pressure (39 psi as recommended by TPIS). The car ran poorly on the street, however I guess WOT performance would have been better.
So if the car is just used on the street, it might actually make more sense to kick the pressure slightly above stock. It is true that the computer will compensate for any non-WOT settings by increasing or decreasing the injector pulse. However, it seems to make sense to have a higher pressure/shorter pulse combination versus lower pressure/longer pulse since with the higher pressure, I have heard it argued that the fuel is atomized better. Of course I may be wrong.
So if the car is just used on the street, it might actually make more sense to kick the pressure slightly above stock. It is true that the computer will compensate for any non-WOT settings by increasing or decreasing the injector pulse. However, it seems to make sense to have a higher pressure/shorter pulse combination versus lower pressure/longer pulse since with the higher pressure, I have heard it argued that the fuel is atomized better. Of course I may be wrong.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Adjustable fuel pressure regulator? (95AquaC4)
The real use of an AFPR is to tune fuel flow to air flow at WOT, when the ECM in open loop mode.
With your mods you will likely see some gains at the strip.
Start out by setting the AFPR to current fuel pressure and tune from that reference point.
With your mods you will likely see some gains at the strip.
Start out by setting the AFPR to current fuel pressure and tune from that reference point.
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
Re: Adjustable fuel pressure regulator? (65Z01)
65Z01,
Have a look at the entire thread. It doesn't do squat on the 94-96 LT1/4. The PCM will adjust out any gains within a few miles of part throttle driving. Not L98s, but 94-96 LT1/4.
Eric
Have a look at the entire thread. It doesn't do squat on the 94-96 LT1/4. The PCM will adjust out any gains within a few miles of part throttle driving. Not L98s, but 94-96 LT1/4.
Eric
