Fuel Pressure

[chiliredDX]

My fuel pressure is at 15psi right now. Looking for what the stock fuel pressure is so i have a base to work from to tune my engine.

Running 750cc injectors w/ a HP Walbro 255lph pump.
AEM adj FPR.

Thanks

 

[vtec95civicsi]

i believe the stock fuel pressure would be like 34 or 36. someone correct me if i am wrong but im pretty sure thats what mine was before i turned it up a tad

 

[senatE]

why are you running 750 cc injectors? unless your car is boosted that was a waste of money.

 

[chiliredDX]

why are you running 750 cc injectors? unless your car is boosted that was a waste of money.

im boosted.

 

[stealthy]

i think mine is about 38-40psi.

you must be around 325-350whp i assume?

 

[senatE]

im boosted.

o ok. well mine is set at 32. so between 32 and 35 from all the info you have gathered.

 

[juan2k2001]

yea but its 35PSI with injector with 210cc witch is your average honda hes running 750 I would bring it down to 20 if your all motor...if your getting tuned with a stand alone you can run 35psi

 

[chiliredDX]

sweet. will start @ 35 and work from there.

 

[stealthy]

sweet. will start @ 35 and work from there.

you know what optimum duty cycle is, right?

 

[93turbo16]

Basically you have two different fuel pressures you can set, which is line on or line off the FPR.

With the line off, you should set it to be around 42psi. When you put the line back on the FPR, you should read anywhere from 35 to 36. It is usually best to set the fuel pressure with the vacuum line off the FPR, that way it is seeing atmospheric pressure.

 

[juan2k2001]

Also you gotta see what type of 750cc injectors you got...that also come in handy in a tune...wjile tuning sont forget your last cylinder always get less air..so be easy with that one..unless you got a port job on you intake.

 

[AliasNeo]

you mean cyl 1 get less air? unless its boosted then cyl 4 get less air???

 

[chiliredDX]

sorry for the long wait. well, had a bit of a snafu with the turbo set up. learned the hard way not to get an ebay turbo even if it comes with $700 worth of accessories with it. anyways, back to n/a, but to answer some of the questions, i have/had low impedence accel injectors. now im running some 310's with the n/a setup. also have a 3 way valve job, stage 3 pnp, ferrea stainless steel valves, springs, titanium retainers/clips,

however, got the fuel pressure part of the puzzle figured out. now just have to get the beast in tune. going to be a bit of a challenge with a turbo cam in it. have a n/a cam, might switch it over, but im getting antsy just to drive it, it has been up on jackstands since may. should be driveable in a week or so.