what is the proper output pressure for 1997 pontiac grand prix gtp

Asked by May 19, 2012 at 11:30 PM about the 1997 Pontiac Grand Prix 2 Dr GTP Supercharged Coupe

Question type: Maintenance & Repair

6 Answers

12,305

The stock pulley on a GTP's supercharger, which is an Eaton Model 90, measures 3.8 inches in diameter. This turns the supercharger 1.84 times the speed of the crankshaft, . This rotation of the supercharger pulley drives two impellers that compress the air and force it into the lower intake manifold as compressed air. If a smaller than 3.8 inch pulley (stock) is used, you increase the rpm thus increases the compression of the air inside your supercharger, called boost. Your stock pulley will translate into a maximum of about 7.5 to 8 (psi) of boost, whereas a 3.5" pulley will increase that to over 11 psi of boost. In terms of power output you can expect around 30 more horsepower and at least the same increase in torque. Caution though, turning the supercharger at higher rates can damage engine and drivetrain.

135

lol it produces 20percent vac while off the gas and 6 to 7and a half psi of boost when you are realy on the gas :)

12,305

I think you mean 20 inches of vac at idle.......

135

haha ^^ u know what i mean its a little bit of boost for being stock but im happy with it it was only producing 4 psi of boost when i bought it i had to fix all the vac lines

12,305

yeah I hear ya. I have a 98GTP. Just did some mods to it getting about 11.5 lbs now. Gets up and goes pretty decent now.....

5

I get half boost y is thath

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