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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-04-2005, 01:35 PM   #1
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Default Fuel pressure regulator

I recieved the recall notice last week on the FPR on my 99 se. I am considering purchasing the adjustable unit from casper'* instead of getting the recall done with the stock unit; considering this because I have used the casper'* FPR in the past on other vehicles. Just wondering if anyone is currently running this on there 3800 to see if this is a worthwhile purchase. I am going to be investing in other mods real soon so i think it may be worth it to purchase this. For anyone who doesnt know about this recall cause it startled me when i saw it it has to do with leaks from the regulator that could basically cause a fire. I dont know if it extends to other years other then 1999 but common sense says if its the same unit as other years then it probably does.
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Old 03-04-2005, 02:22 PM   #2
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what'* the cost diffrence? It really isn't going to do anything performance wise and if it'* much more expensive, you can save that money and put it torwards bigger and badder things for ur n/a.
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Old 03-04-2005, 02:23 PM   #3
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Quote:
Originally Posted by 95naSTA
what'* the cost diffrence? It really isn't going to do anything performance wise and if it'* much more expensive, you can save that money and put it torwards bigger and badder things for ur n/a.
Exactly...what is it you plan on doing with an adjustable anyway?
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Old 03-04-2005, 02:39 PM   #4
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Quote:
Originally Posted by 95naSTA
what'* the cost diffrence? It really isn't going to do anything performance wise and if it'* much more expensive, you can save that money and put it torwards bigger and badder things for ur n/a.
Cost from GM is free. I had to have it done on my 99, too.
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Old 03-04-2005, 04:32 PM   #5
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I run the casper'* afpr on my 2000 alero along with an aftermarket fuel rail and chip. typically i have the fuel pressure at would be normal but i feel it was a good investment with the rail and chip. Im probably going to have the recall performed at GM and then down the road later if necessary with mods by the adjustable unit. I suppose if guys are running these engines with alot of mods without it then it may not be necessary, thats what i am trying to determine.
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Old 03-04-2005, 04:38 PM   #6
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I don't know of anyone here who runs an upgraded fuel pressure regulator...and there are lots of modded L27, L36, and L67s here.
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Old 03-04-2005, 05:05 PM   #7
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Mostly because there'* little sense in it as far as I can see. Only reason I've ever seen one used is for fine tuning, i.e. make the 36# injectors work like 37.1# or 35.3#. For the most part the same functionality can be had with larger injectors and a Mini AFC which is the way most go.

Is there a different reason you use it?
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Old 03-04-2005, 05:29 PM   #8
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thanks for the information, im going to just get the recall done with GM. alot of my honda driving friends (lol) use afpr'* in there upgraded fuel systems im told that the higher pressure helps, I unfortuately didnt notice much of a difference in performance but i did notice i spend alot more time at the gas station. so like i said most of them time i keep the fuel pressure at the stock 48psi, but i can see that no one here lists this in there mods lists so I'll be looking into better choice mods.
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Old 03-04-2005, 06:06 PM   #9
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Well its not to say that they aren't beneficial in certain circumstances. Such as if 36# injectors will only handle 340hp at 47psi, at 55psi they might handle 370hp. Think of it as milking the last bit out of the injectors.

Keep in mind also that its basically air that makes power (sounds ignorant I know but I'm going somewhere here). An engine is an air pump and 99% of modifications deal with air. Cams, Turbos, Superchargers, Porting, Valve Jobs, Strokers, all of that deal with getting more air into the engine. The only time you need to mess with fuel is if you've added more air than they can support.

That said, using an adjustable pressure regulator to add more pressure (thus more fuel) will do nothing for you. Especially after your o2 sensor picks it up and corrects it.

Just a lil FYI so you can spit it at your honda driving buddies
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Old 03-05-2005, 12:36 AM   #10
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lol, i dont know man they've already taken enough abuse by my american cars spitting on them. But i can see what u are saying about where it is beneficial for more fuel pressure.
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