Adjustable fuel pressure regulator
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
Adjustable fuel pressure regulator
Anyone here run the Holley tpi afpr? I have an adjustable on my engine now but it is not acting as it should for some reason. The diaphragm is good but getting the pressure set is hit & miss. I am thinking of getting the Holley but would like some feedback. If not the Holley then what would be your choice?
Safety Car
Joined: Dec 2007
Posts: 3,616
Likes: 5
From: Sandhills of North Carolina
I have the Holley. So far so good except the adjusting screw broke with me. I just replaced it and all seems ok. I had mentioned the Holley to Jon at FIC and he said that they have had a lot of problems with them. He didn't elaborate but you might want to get his input before buying one.
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
I have the Holley, and I had to file the edge of the body of it a little to fit my fuel rail. After that, it was set it and leave it. i checked it a few times after I installed it, but since it was always right on, I haven't touched it in maybe 5 years.
Just a word to the wise.........
DON'T PLAY WITH IT.
I was moving the center piece, and it fell out, and the spring with it. It was a bear to reinstall it with the spring shooting out of the hole till I got it right and pressed on the spring, pushed the pivot juuuuuust right, and then put it in a plastic bag till I installed it.
what a pita.
installed, it works as advertised.
Just a word to the wise.........
DON'T PLAY WITH IT.
I was moving the center piece, and it fell out, and the spring with it. It was a bear to reinstall it with the spring shooting out of the hole till I got it right and pressed on the spring, pushed the pivot juuuuuust right, and then put it in a plastic bag till I installed it.
what a pita.
installed, it works as advertised.
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
coupeguy2001, thanks for the warning.
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Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
Dan, I have another question, the only Holley regulator I can find for TPI lists Camaro & Firebird w/305. Am I missing another one for the 350 or would that one work? It's the one with a disc on the top for adjustments.
Thread Starter
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
I'm afraid my diaphragm may be the problem in the adjustable I have now and by the time I buy a new diaphragm it's not too much more for a whole new unit.
Last edited by pewter99; Aug 9, 2010 at 08:45 AM. Reason: NSV link removed
Team Owner
Joined: Jan 2003
Posts: 20,333
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From: Summerland B.C. Canada
Last edited by pewter99; Aug 9, 2010 at 08:47 AM. Reason: NSV link removed
Race Director
Joined: Apr 2003
Posts: 17,700
Likes: 1,667
From: moraga ca
I run the Holley with the big disk on top and I think it's great. After a run and reviewing the datalog, if I want to tweak the afr throughout the rpm range, I'll just turn the **** instead of firing up the laptop and doing it through the computer. I have mine marked at 12:00 (on a clock). If I want to go a little richer, I'll move the **** to 12:30 or 1:00 if I need more. Moving it :30 will make a difference of .1 or .2 afr and it only takes a second. Helps to have a wideband.
