500 efi upgrade
 

2000 powerquest 380avenger /500 efi /teauge drives/ imco lowers/ 28 bravos
74 mph gps at 5100
need more power would like to run mid 80's
need help what best way to increase power of 500 efi

Just a general idea, to gain 10-11 MPH means you will need about 200HP. Whipples will give you that. The EFI intake is the hold back on that engine. I did heads, cam, compression, & dyno on mine. Got it to 570HP. I did one last yearfor a buddy, made it a 540, heads, cam Etc. Dyno at 630HP. It runs out of air. The intake was fine for what it was but will not make any big power.
My 2 cents

Last winter we upgraded some 500efi to make a little over 600hp at 5100-5200,we used afr cnc heads,custom grind cam,55lb injectors,aeromotive fuel system,arizona throttle body and custom ecm tuning,engines went into a 42 cig and runs great,I could put together a complete kit for you if interested,just bolt it up and go.If you don't use a complete tested kit would be easier to use a single plane and holley hp carb along with heads and cam work,unless you want to spend a lot of time on dyno tuning.Dave 410-956-5381

Superchargers make the most hp, hands down. Thats 12-15mph and 200-250hp. For NA, better heads, cam, porting intake, big throttle body, tuned for 91 will get you around 580-600hp. After that, you need ci and compression to make more.