Kirban fuel pressure regulator
Thread Starter
Racer
Joined: Mar 1999
Posts: 258
Likes: 13
From: New Mexico
Kirban fuel pressure regulator
Installed a Kirban fuel pressure regulator onto my Holly Stealth Ram (modified to fit) in my 1990 C4 383 Corvette. Now I get a maximum fuel pressure of 30psi with the vacuum hose removed, and 25psi with the hose connected while the car tries to idle. So few questions please;
• I have 32# injectors; what fuel pressure should I try and set too?
• I have a factory fuel pump; what is a direct replacement in-tank pump I can use?
• I have 32# injectors; what fuel pressure should I try and set too?
• I have a factory fuel pump; what is a direct replacement in-tank pump I can use?
Le Mans Master
Joined: Sep 2013
Posts: 6,192
Likes: 750
From: near the thumb in the mitten
Your FPR is regulating fuel pressure below stock specification. You need to have at least 30 psi at idle. If you run low fuel pressure you will need larger injectors. In a sense you will be "reinventing the wheel". There are many threads moving from 350 to a 383. Just need to search them.
Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
Your FPR is regulating fuel pressure below stock specification. You need to have at least 30 psi at idle. If you run low fuel pressure you will need larger injectors. In a sense you will be "reinventing the wheel". There are many threads moving from 350 to a 383. Just need to search them.
Last edited by THE 383 admiral; Jan 23, 2016 at 03:40 PM.
Team Owner
Joined: Jul 2004
Posts: 28,495
Likes: 3,298
From: Hartford WI
This pressure is FUBAR. I am running 43 all day long which is what the injectors are rated to and with my fuel pump, there might only be a momentary drop if you WOT it but that is about it. Note, it WILL NOT hold pressure after shutdown. I changed it from stock HSR to Kirban and even talked to Kirban but they said it was what it was.
Safety Car
Joined: Nov 2009
Posts: 3,973
Likes: 341
From: Adelaide South Australia
Installed a Kirban fuel pressure regulator onto my Holly Stealth Ram (modified to fit) in my 1990 C4 383 Corvette. Now I get a maximum fuel pressure of 30psi with the vacuum hose removed, and 25psi with the hose connected while the car tries to idle. So few questions please;
• I have 32# injectors; what fuel pressure should I try and set too?
• I have a factory fuel pump; what is a direct replacement in-tank pump I can use?
• I have 32# injectors; what fuel pressure should I try and set too?
• I have a factory fuel pump; what is a direct replacement in-tank pump I can use?
the first question is, do you know how to increase pressure on the Kirban, and have you been doing that, or is that just what it is as you have installed it ?
Team Owner
Joined: Jul 2004
Posts: 28,495
Likes: 3,298
From: Hartford WI
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Melting Slicks
Joined: Sep 2010
Posts: 2,422
Likes: 202
Ok, that is way better. but your car is going to run rich. Until the Prom inside the ECM is tuned to match your WAY over rated 30 Lbs / Hr injectors. as above 48 Lbs on the rails will up the Flow rate of the already to Large injectors.. Set to 40 - 42 Lbs.
Last edited by THE 383 admiral; Jan 25, 2016 at 02:00 PM.
Team Owner
Joined: Jul 2004
Posts: 28,495
Likes: 3,298
From: Hartford WI