Fuel Pressure
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Senior Member
Joined: Oct 2005
Posts: 874
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From: Waldorf, MD
Car: 91 Formula, 89 IROC
Engine: LB9, LB9
Transmission: 700R4, 700R4
Axle/Gears: Posi 2.73, Posi 2.73
Fuel Pressure
About where would you guys start putting your fuel pressure if you had all of the mods in my sig? I am going to order the afpr and fuel pressure gauge kit and then start dialing it in. What is stock supposed to be and where do you think my engine would be comfortable at with alot more air moving in?
Supreme Member
Joined: Jul 2000
Posts: 1,854
Likes: 0
From: Ga
Car: 91 RS
Engine: 305
Transmission: T5
Axle/Gears: 3.73
I would get the guage installed and keep track of what it is reading to get used to what it is when stock as you have it now. Just turning up the fuel pressure does nothing for your overall tune unless the datalogs show that you are lean overall. Do you have any datalogs to show this?
That being said several people on here have done bolt-on's without increasing the fuel pressure. Do some research and read some of the post's by 91RockS and even older one's by BEAST5SPFGTA. These two come to mind for only bolt-on parts for the LO3. They both were able to get to the high 14's without opening up the engine and IIRC stock fuel pressure. Both with a 5 speed also.
It appears that you have a very similar car except for the gear change. (Like me
)
That being said several people on here have done bolt-on's without increasing the fuel pressure. Do some research and read some of the post's by 91RockS and even older one's by BEAST5SPFGTA. These two come to mind for only bolt-on parts for the LO3. They both were able to get to the high 14's without opening up the engine and IIRC stock fuel pressure. Both with a 5 speed also.
It appears that you have a very similar car except for the gear change. (Like me
) Member
Joined: Jul 2004
Posts: 200
Likes: 0
From: Wisconsin
Car: 91 Camaro RS
Engine: 305 TBI (L03)
Transmission: T5
Axle/Gears: 3.73 Truetrac posi
DM91RS is right on. You really need to know if you're running rich, lean, or right on. The factory tuned these motors slightly on the rich side to be safe, so you can get away with some mods before getting too lean. The best way to know where you are at is installing a fuel pressure gage and using a wideband oxygen sensor. Otherwise you'll be shooting in the dark (unless you know how to read plugs). I modified the facotry FP regulator to make it adjustable. I'm running ~12 psi (which is about factory pressure) with similar mods to yours. I need to push the pressure up to 14 or 15 since I'm running out of room on my VE tables. Thread
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