paxton

[mrclean27_72]

Anyone know anything about this older model supercharger? (psi output)

[StangFlyer]

What model is it? SN-92?

[mrclean27_72]

Originally Posted by StangMan

What model is it? SN-95?

no markings on it other than the paxton sticker

[StangFlyer]

Originally Posted by mrclean27_72

no markings on it other than the paxton sticker

I believe it should have a metal tag on it also that has the model number and stuff. If not, it looks like an SN 89, the SN 92, or SN 93 unit... although the label's color isn't the typical blue so I am not sure. In any event, the SN ball drive units made 5 PSI with the 4.25" pulley they came with. You could overdrive the units with a 3.75" compressor pulley to make 7 PSI or a 3.5" pulley to make 8 PSI. That is at 5500-6000 RPM. Spinning the motor to 6500 RPM you might see another pound of boost. When I ran my older 302 combination with an SN unit and a 3.5" pulley I made 9 PSI at 6500 RPM. However, you have to be very careful not to over rev the ball drive units because they are known to break if you do. Therefore, a lot of people avoided using the 3.5" pulleys and ran the 3.75".

Also, there was a later ball drive type "race" unit called a VR4 that made 13-15 PSI (I believe). I am not sure what size pulley it used though.

Btw, does it have a six rib pulley on it?

[mrclean27_72]

Originally Posted by StangMan

I believe it should have a metal tag on it also that has the model number and stuff. If not, it looks like an SN 89, the SN 92, or SN 93 unit... although the label's color isn't the typical blue so I am not sure. In any event, the SN ball drive units made 5 PSI with the 4.25" pulley they came with. You could overdrive the units with a 3.75" compressor pulley to make 7 PSI or a 3.5" pulley to make 8 PSI. That is at 5500-6000 RPM. Spinning the motor to 6500 RPM you might see another pound of boost. When I ran my older 302 combination with an SN unit and a 3.5" pulley I made 9 PSI at 6500 RPM. However, you have to be very careful not to over rev the ball drive units because they are known to break if you do. Therefore, a lot of people avoided using the 3.5" pulleys and ran the 3.75".

Also, there was a later ball drive type "race" unit called a VR4 that made 13-15 PSI (I believe). I am not sure what size pulley it used though.

Btw, does it have a six rib pulley on it?

What size crank pulley? and injectors?

[StangFlyer]

The crank is typically a 7" pulley. What injectors you would run just depends on the motor as a whole and the horsepower you are making under boost. On a stock 302 you could run stock injectors with an FMU (came with the SN kits). Or, you could nix the FMU, upgrade to bigger injectors, and custom tune the car with a chip... which is really the best way to go.

[86saleen13]

I just put a Paxton SN-89 into my '86. I went with the 3.75" pulley and the stock 6" pulley and am getting 6 lbs of boost @ 5200 and 8 lbs at 5700. I am running 24# injectors w/ 65mm throttle body. And its a speed density car. I got it to keep the old school 5.0 - old school. I can shread the tires in 1st and 2nd gear no prob!! And that is with 3.08:1 gears.I did upgrade the impeller to a new more efficient one. Call Paradise Wheels for information on the old ball-drive Paxton superchargers. Tey still make them under the Paxton name. http://www.paradisewheelsinc.com/ or 760.740.0954

Tere you go.
Ed
Saleen 86-0013