Adjustable fuel pressure regulator?
Thread Starter
Instructor
Joined: Jun 2004
Posts: 112
Likes: 0
From: Hewitt TX
Adjustable fuel pressure regulator?
On an afpr do you adjust the fuel with the vacuum line on or off of the regultor.
Also I just upgraded to 25lb fuel injectors do I need to run at a different fule pressure besides 40psi. Thanks for all your help over the past few months.
Also I just upgraded to 25lb fuel injectors do I need to run at a different fule pressure besides 40psi. Thanks for all your help over the past few months.
Burning Brakes
Joined: Apr 2002
Posts: 934
Likes: 0
From: MO
pull the vaccum line off to adjust. Fuel Pressure is a thing that I've always found ya just gotta play with. Seems a little differnt for every car/setup. 38-39 is where my car ran best with the stockers. I am running 30lb injectors now at the same pressure, haven't had dyno time to adjust for optimal setting.
Instructor
Joined: Nov 2002
Posts: 107
Likes: 0
From: clarendon hills il
use a scan tool
I just talked someone who does this kind of thing for a living, and they said the only way is to hook up a scan tool drive around and see where the integrator and block learn values are at during cruise. The block learn should be at 128. If not, make adjustments 1 psi at a time, drive around again and check block learn.
I'm not sure if you have a scan tool, but I just started getting into this, and it's way cool. I use the tunerpro RT software and built my own cable. I use the probst corvette fuel injection book to figure out what to look for. I think using a scan tool is the key for sucessful tuning.
I'm not sure if you need to have the vacuum line connected.
Good luck
I'm not sure if you have a scan tool, but I just started getting into this, and it's way cool. I use the tunerpro RT software and built my own cable. I use the probst corvette fuel injection book to figure out what to look for. I think using a scan tool is the key for sucessful tuning.
I'm not sure if you need to have the vacuum line connected.
Good luck
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Burning Brakes
Joined: Apr 2002
Posts: 934
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From: MO
Originally Posted by cicch95
What is the fuel pressure stock for the lt1?
Melting Slicks
Joined: Jan 2000
Posts: 3,418
Likes: 1
From: NW Chicago Suburbs
The issue is that the 94-96 PCM will adjust the WOT injector pulse width on the fly. The reason why is related to the block learn stuff mentioned in an earlier above. In a 94-96, the PCM adjusts out any HP benefit gained by tweaking the fuel pressure within a few minutes of driving. I guess tweeking the FP works great in earlier Vette PCM/ECM, but not th 94-96 LT1/4.
Eric
Eric
