[prudygirl]

I recently installed a 9lb Powerdyne supercharger on a 1990 5.0 mustang. When I fully accellerate the car takes off quick but only shows three pounds of boost and then at 4000RPMS starts crapping out, sounds like plugs misfiring. Any advice greatly appreciated.

[maxx90]

Did you install larger volume fuel pump? You could be running lean I had a simialr problem with it laying down at the higher rpm. I made a cheap fuel gauge extension to get out of the car (used the shradder valve) so I could have someone watch it. Sure enough it was running out fuel. Also you need to go to a colder plug and bring the gap down i believe its should be around 32 -35. For the low psi make sure that belt is super tight.

Jim

[2Manystangs]

yeah, you should have a fuel pressure guage installed as a matter of necessity inside the car...add octane booster as well. Lucas or Torco is best...cheap insurance...get it on a dyno, best way to see what's happening in real time

you can also add Kenne Bell's boost a spark and boost a pump...they work great and only come on when you are under boost

I see you are near me, I know someone who can tune your car for you and do a dyno session for about $500, send me a private message if you are interested.