what do you recommend guys for a 350?

 

Try 41/43 psi

 

I recommend 42-46psi

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1988 Pontiac Trans Am GTA L98 5.7L, Black on Black with 114,000kms.

Best ET 14.559 @ 95.25MPH
Custom 3" Stainless Exhaust Y-Pipe back (High flow Cat and Flowmaster Mufler)

 

YOU HAVE NOT INCLUDED YOUR MODS. WHAT ARE THEY.

ANYTIME YOU INCREASE CAR'S VOLUMETRIC EFFICIENCY YOU SHOULD INCREASE THE F/PRESSURE.

IF YOU HAVE THINGS LIKE HEADERS, CAM, PORTED INTAKE, ETC, YOU SHOULD INCREASE THE PRESSURE.

BY HOW MUCH IT ALL BEPENDS. CHECK YOUR STOCK PRESSURE WITH THE HOSE OFF. IT SHOULD BE IN THE 39 PSI RANGE. INCREASE IT TO 41 PSI TEST DRIVE THE CAR FOR FEW DAYS. FEELS GOOD, INCREASE IT TO 43 TEST DRIVE IT FOR A FEW DAYS FEELS BETTER INCREASE AGAIN BY 2PSI UNTILL YOU FEEL PERFORMANCE GO DOWN THEN BACK OFF TO YOUR PREVIOUS SETTING.

GOOD LUCK.

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89Iroc, 305 TPI, WC T5, 3.08 Posi, Flowtech Headers, 3 inch over the axle, Flowmaster 80, Aluminium Driveshaft, Ported Plenum, Air Foil, K&N, AFPR, Smog/AC/Cat Delete, 3300lbs, All free mods

 

my engine is a stock 350

 

The best way is to get a air/fuel ratio meter and adjust accordingly... this is the best way to get proper tuning.

 

I did a lot of research of this, and came to the conclusion that our cars should keep the stock injectors, but definitely up fuel pressure, really only because of atomization concerns... the stock regulators have trememdous variation in their out put also. Check your fuel pressure stock first, using the shrader valve on the rail, and with the vacuum hose disconnected to the regulator. Stock output varies between 37 to 44 psi, mine was 43.5. I then up'ed it gradually, finally running at 48psi to 50 psi in special circumstances... the car runs great and the times were good at the track... plugs and other tell tales show the ECM making the proper corrections/

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Jethro
1987 IROC Z 13.92 and 1.92 60' street tires stock engine