What fuel pressure to start at?

Killercanary · 03-25-2001, 11:31 PM

The regulator works like this: at idle your vacuum is at its max. When you hit the throttle, vacuum goes down, and fuel pressure goes up- this supplies more fuel at higher RPM's. If your car is running rich at idle it means your pressure is either too high, or you vacuum is low and the difference between vacuum and no vacuum is minimal. Basically its like running your car with the vacuum line off and the pressure will be as high at 1000RPM's as it will be at 5000rpms's, but you obviously don't need the same amount of fuel at 1000rpm's as you do at 5000rpm's. I hope this helps explain it for you. It used to confuse me too, so don't feel bad.
So if you think your car is running good everywhere in the powerband except down low, this is why it was suggested you may have a vacuum leak resulting in higher pressure at idle.

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95 GT convt' 5 speed, 3.73's,FMS HD clutch, Pro 5.0 shifter, ASP alum. underdrive pulleys, Bassani offroad X pipe, 2 chmbr flowmasters, K&N w/o silencer, edelbrock performer intake, FRPP 65mm T-body, FRPP shorty headers, FRPP aluminum driveshaft.Hooker 4pt chrome car bar, Xenon/Wings West ground effects, custom interior
Best ET: 13.83
Best MPH: 98.55mph with Best 60': 1.91 on Nitto DR's
Homepage: <A HREF="http://www.angelfire.com/pa2/killercanary" TARGET=_blank>http://www.angelfire

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03-25-2001, 11:31 PM	#1
Killercanary Registered Member Join Date: Nov 1999 Location: Altoona, PA Posts: 336	The regulator works like this: at idle your vacuum is at its max. When you hit the throttle, vacuum goes down, and fuel pressure goes up- this supplies more fuel at higher RPM's. If your car is running rich at idle it means your pressure is either too high, or you vacuum is low and the difference between vacuum and no vacuum is minimal. Basically its like running your car with the vacuum line off and the pressure will be as high at 1000RPM's as it will be at 5000rpms's, but you obviously don't need the same amount of fuel at 1000rpm's as you do at 5000rpm's. I hope this helps explain it for you. It used to confuse me too, so don't feel bad. So if you think your car is running good everywhere in the powerband except down low, this is why it was suggested you may have a vacuum leak resulting in higher pressure at idle. ------------------ 95 GT convt' 5 speed, 3.73's,FMS HD clutch, Pro 5.0 shifter, ASP alum. underdrive pulleys, Bassani offroad X pipe, 2 chmbr flowmasters, K&N w/o silencer, edelbrock performer intake, FRPP 65mm T-body, FRPP shorty headers, FRPP aluminum driveshaft.Hooker 4pt chrome car bar, Xenon/Wings West ground effects, custom interior Best ET: 13.83 Best MPH: 98.55mph with Best 60': 1.91 on Nitto DR's Homepage: <A HREF="http://www.angelfire.com/pa2/killercanary" TARGET=_blank>http://www.angelfire