Paxton SN89 Supercharge Questions Just Purchased! - Third Generation F-Body Message Boards

joephis2002 · 05-04-2007, 06:24 PM

Just purchased a factory rebuilt SN89 Supercharger kit for my 89 iroc. It is the complete kit with oil cooler for my tpi setup. Have a few questions tho...right now here is the mods I have done:

stock 350 lower
aluminum vette heads 2.02 ports
cam
some upper intake porting (airfoil, plenum work)
fuel pressure reg. / ignition coil
full edelbrock exhaust

My question is will I need to do anything else to the car? Chip? Fuel injectors? Fuel rails? ANYTHING? Car has only 57k on it so low end is still strong...any help would be GREAT! And any advice would also be wonderful! Thanks guys!

WheelsUp84z · 05-05-2007, 03:39 AM

Fuel Injectors, and fuel pump, once its installed should get it tuned. Maybe an MSD box with boost retard, and a set of plugs. Although you should be able to run decent boost with the aluminum heads. What are the specs on the cam you're running?

joephis2002 · 05-05-2007, 10:48 AM

Any idea on what size injectors/pump? And for the cam its a comp cam specs i have listed are:

gross valve lift .449 intake .456 exhaust
duration @ .050 212 intake 218 exhaust

not sure what else you would need. and thank you for the already given info...

WheelsUp84z · 05-06-2007, 06:09 AM

30# injectors and a walbro 255lph call it a day., i would suggest some more lift on that cam and maybe some more duration, make sure the LSA is around 112-114.

vwdave · 05-06-2007, 07:25 PM

I would be worried with the vette heads with the 58cc chambers and boosting it. Your compression is probably somewhere in the 9.75-10.0 range.

Good luck though.

CAMAROJOKESTER · 05-14-2007, 11:58 PM

according to the tech at paxton you can run up to 6psi at 10.5:1 cr. and not have any problems as long as your retarding your timming..