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Originally posted by 50 Deep:
your car is an OBD II

If you pull the plugs and they are white then the car is lean. They should be a bronze color, but not black.

Stock fuel pressure is 38-39psi. If your running 30psi then your car is starving for fuel!!!!! Be sure you check/adjust it with the car running but the vacuum line to the regulator disconnected. Id set it at 38 then go drive it. plug up your guage then Increase or decrease your fuel pressure in 2psi increments then go drive it again and see how it feels. If your tuner is adding fuel up top then you dont want to add to much so you dont end up running rich. but like i said your way below stock fuel pressure and forced induction cars always need more fuel.

If your running 48lb injectors you should defintely have an aftermarket MAF regulator 75mm or bigger. Unless the tuner used software to recalibrate the stock MAF sensor.

Who is your tuner?

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Originally posted by 50 Deep:
If john b said it was good then i would take his word for it also. he assembled my last motor.

However if your tuner is adding fuel up top then that should explain why the car runs better past a certain RPM. simply because it has mor fuel. The hardest part about tuning is getting the off idle to mid range power in perfect balance so its driveable. the top end tuning really isnt where most of the work is needed. If your fuel pressure really is set at a base setting of 30psi then i can almost guarantee bumping up the fuel pressure will make your car feel completely different.

You should have a dyno graph that shows your air fuel right? post that up if you have it

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Originally posted by 707vibrantcobra93:
T is right it's obd 2 I misread thought u had 93 cobra. Are you sure what your looking at is a FUEL PRESSURE GUAGE? If so you should be getting a good reading. As far as reading the plugs, supercharged or not you can read the color and characteristics of it and tell rich, lean, or good. Also, and no disrespect but there isn't one 16 year old kid on this planet that should be in a s/c mustang. DANGER. What color is it and what town so I can watch out for you. I know how I drove my lightly modded mustang at that age. Be careful dude.

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ha yea its an auto meter fuel pressure guage. then im lean as phaq on my plug...

not to argue with you but im in a rush to get my motor issues in check so i can hit the track on may 26th.. i race on the track, have a sportscar on the street. kinda like a lady on the street but a freak in the bed the only time im past 1/4 throttle on the street is when im trying to figure out why the hell the motor doesnt run right. ive driven that car over 20k miles and never been pulled over.. i like to think that ricers have to show off on the street and i try to hold myself to standards above that.. i did play with a fararri once.. that was fun

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Originally posted by SCCA SM:
alright guys some news here.. at idle, 32psi, under load 36psi max, at speed with foot off the gas is 30psi.. how do i increase the fuel pressure? can i do it at home?

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alright some damn good news here

stuck my head under the hood, was trying to listen to what was wrong while revving the engine from under the hood and i thought "wait a minute.. there are supposed to be 2 wires attached to this." sure enough a linkage had popped off.. its running much better but not 100% id say 75%

fuel pressure went up to 34psi idle, 32psi off the gas and 44psi at WOT.. red shelby gt500 on 101 meet a white cobra today? if your reading this i could have smoked you but that was a speed trap and much more than 68 is asking for a ticket..