i was wondering what fuel pressure was recommended by tpis for a maf car,i think it was 46 psi or so but i'm not sure, i think my car is running lean, i just turned the pressure down with no guage when my car was rich and then it ran lean now i am going to set it back and i wanted to know the best psi, i have a 350 tpi, headers, custom ram air, stock heads, cam, and fuel intake

 

Hey man I lived in Frederick all of my life..ever go there? TPiS are a bunch of retarded boasting ****ks. They say from like 47-52 psi on a stock motor..but that is silly mna..start at stock and work your way up..I have best results AT stock..my car runs so rich boosting it only hurts performance. good luck!

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• Red '88 IROC 5 Speed 305 TPI w/3.08
• Dual Friction Stage III Centerforce Clutch
• Accel 300+ Racing Ignition
• Accel 300+ Pro Sleeve Plug Wires
• AC Delco Rapid Fire Plugs
• Flowmaster Force II 3 Chamber Cat Back Exhaust
• Hypertech Chip
• Hypertech Airfoil
• Gutted Air Box
• Best Maryland (40 degrees) E/T 14.686, 60' 2.205, 1/8th mile 9.461, 1/4 mile MPH 93.91
• Best Florida (80 degrees) E/T 14.88, 60' 2.163, 1/8th mile 9.540, 1/4 mile MPH 92.74
• Best 60' 2.163(Florida)
• TPiS AFPR set to 42psi using Accel Fuel Pressure Gauge (Installed after Maryland run)
• Aluminum Driveshaft (Installed after Maryland run)

 

Yeah, u have to see whats the best setting for your car.

Stock is 42PSI, go from there to 55PSI, but don't go any higher because the stock PROM won't be able to read any more than that without giving u BS. Making PROM's set to your specifications would give nice gains in performance also.

[This message has been edited by IROCZTWENTYGR8 (edited April 25, 2001).]

 

Most likely you are pretty good with the fp you are running. Maybe you could go a tad higher due to the headers but I doubt it. I'm pretty close to you too. You ever come to Delaware to cruise? God knows there are too may roads to do it on.

 

By the way, do not believe anything in that book. I have it too and what a waste. I have found 90% of the claims in there to be false.

 

TPIS recomends 46 PSI on a stock engine. I have played with my pressure and found that 42 PSI works the best with my combination of parts. All engines are not the same, adjust the pressure until maximium performance is acheived.

The insider hints book is a worthwhile investment. It gives you clues to what works and what does not. It also shows you what basic modifications need to be done on a TPI engine to extract more power and mileage.

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1988 Formula 5L/5sp 3.45 gears, SLP cold air kit, MAS gutted, TPIS air foil, TPIS AFPR, MAC headers, Mac under drive pulleys, MAC cat back, Relocated MAT.
Best ET street tires 13.85
Best 60 FT street tires 1.930
Best MPH street tires 99.29

 

Mine worked best with 46PSi on a 355 with 19# injectors. I had an SLP cam, 305 heads(dont ask why, explanation is a too long) Headers, full exhaust, COld Air, 58mm TB, Ignition and other goodies and I will tell you that it ran just fairly lean. I probably could have went as high as 48 and saw a few more ponies, but it seemed to run better at low speed on 46. Something to think about and compare with.

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89 Trans Am Turbo 3.8L All stock 43,000 miles #1053 of 1555

Past Thirdgen:
86 Trans Am w/ built 355TPI with SLP goodies and too much other stuff to List. One sweet *** car, wish I would have had a good enough Job to pay insurance on three cars so I could keep it, but for a 89 Turbo Trans Am w/ Low miles, I think I made the right choice!