Advice on fuel pressure...

88hatchblack

New Member

Jul 25, 2004

163

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Willard, Ohio

Aug 22, 2004

#1

• Aug 22, 2004

• #1

here's the setup i'll be running when all the parts come, what should i set the fuel pressure to? freshly rebuilt 302 (stock block) bored .30 over with 9.2 CR, AFR 165's, lunati street avenger Cam and lifters (.512int/.512ex) 281* duration, comp cams 1.7RR's, trick flow track heat intake, A9L, 73mm C&L mass air meter, 76mm C&L trueflow tube, 70mm BBK TB & EGR, 24lb injectors, adj. BBK FPR & guage, 1 5/8 headers w/ 3" collectors 2.5" off-road h and flowmaster cat back. Is there any real way to tell or will i just have to make sure its running rich then slowly lean it out? maybe get an Air/Fuel monitor?

 

88hatchblack

New Member

Jul 25, 2004

163

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Willard, Ohio

Aug 23, 2004

#2

• Aug 23, 2004

• #2

anyone??!!


i have no idea what to set as a base fuel pressure for a combo so far away from stock.

 

B

blk92stangg

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Jan 30, 2004

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Hawaii

Aug 23, 2004

#3

• Aug 23, 2004

• #3

The ECU will compensate for high or low pressure settings, to a point, so if it was me, i would set it at 40 pounds or so, and see how the things runs. For WOT tho, you would need to get the thing dyno'd, or use Jrichker's seat of the pants dynomometer...do a search, or hope he chimes in. I really don't know for sure tho, so heres a BUMP hoping for more knowledgable info.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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Aug 23, 2004

#4

• Aug 23, 2004

• #4

im with Blk92. the puter will adapt - problem being that the higher the pressure, the less the duty cycle and vice versa.
guys like Michael and Rick have a real good feel with this stuff - i bet they chime in, in the a.m.

there is some debate that the puter can compensate at WOT as well - even though the o2's are not in use. some say it can, some say it cant. so that is another possible variable.

you mention an a/f monitor. a wideband would be the best way to go.

good luck.

 

88hatchblack

New Member

Jul 25, 2004

163

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Willard, Ohio

Aug 24, 2004

#5

• Aug 24, 2004

• #5

thanks for the help guys! i guess the computer is more versatile than i thought

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

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129

Aug 24, 2004

#6

• Aug 24, 2004

• #6

running a scanner or dyno-ing the car would be the best way to dial in what pressure exactly (i would prefer a higher duty cycle, but not at the expense of spray performance). if you go with Blk's suggestion, that should get you in the ballpark.

good luck.