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October 29th, 2007, 10:36 AM
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#1 |
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Regular
1992 LX 5.0
Join Date: Oct 2007
Location: Birmingham, AL
Posts: 334
 iTrader: 0 reviews
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stock fuel pressure
Anyone know what the stock fuel regulator is set at?
On the dyno the other day the car was running rich, i would like to try an adj. fpr before going back. All the adjustable regulators seem to range from around 30-35 to 65-75. Didn't want to put one on yet if the stock one is 30, I wouldn't be able to lean it out for any gains. |
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October 29th, 2007, 10:40 AM
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#2 |
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Enthusiast
1987 Mustang GT
Join Date: Apr 2007
Location: IL
Posts: 685
iTrader: 0 reviews
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stock fuel pressure
i wanna say the stock fuel pressure is 39 psi
__________________
 87 GT, typhoon upper and lower,70mm tb, 90mm maf, bbk shorties, bbk x-pipe, flowmaster cat back, 3:73 gear, pro 5.0 shifter, novi blower,afm power pipe, load IO, Trick Flow heads, Anderson B-31 cam, Anderson PMS, 42 lb injectors, t-rex fuel pump.
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October 29th, 2007, 11:46 AM
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#3 |
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MM Fanatic
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,737
iTrader: 0 reviews
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yeah like 39 Plus or minus 10 ...
__________________
88 GT CHI headed 351w 10.8 @ 125 - still figuring it out. 03 Cobra 2.3 whipple 10.7 @ 129 - sold it 04 Mach 1 12.7 @ 109 mostly stock - sold it 89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it 
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October 29th, 2007, 11:58 AM
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#4 |
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Regular
1992 LX 5.0
Join Date: Oct 2007
Location: Birmingham, AL
Posts: 334
iTrader: 0 reviews
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thanks
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October 29th, 2007, 02:56 PM
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#5 |
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Hardcore Enthusiast
Join Date: Jun 2006
Posts: 1,027
iTrader: 0 reviews
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lowering the fuel pressure isn't likely to lean you out any (temporarily it will but not long term). the ECM determines the A/F ratio based on o2 sensor readings, so changes to fuel pressure are negated by the ECM by lengthening/shortening injector pulsewidth.
if you are running rich there is another problem; ie miscalibrated mass air meter, faulty o2 sensors or wiring, exhaust leak causing the o2s to read lean, bad tune via chip or piggyback tuner, etc etc. Check the Codes to find out why you are running lean rather than jacking with the fuel pressure and possibly screwing up your injector spray pattern and atomization. my2cents |
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