I am building a new motor this winter and getting rid of my Modified 500efi set-up and going with an aftermarket EFI for more power. The motor will be 700-800HP 540 with no blower. What are people running and how easy is tuning? I am looking at a custom Holley set-up with a 2000 cfm throttle body. Thanks, Jeff Wurl

Download the software from whoever you're considering and see what makes sense.

I used the Holley HP system. Software is awesome (I've used others since and Holley is tops) and tuning with self learn was a snap once I figured out how to properly mount the O2 to keep it from shorting out due to water. I detail my build here: http://www.offshoreonly.com/forums/c...r-project.html

we made our own setup...using a 1000cfm throttle body, 96lb injectors, mega squirt ECM, our own program, not a lot of tuning time this year, so about 82 in 253 checkmate 509 w/MS3 procharger..5-6 psi..

http://bigstuff3.com/ Big Stuff 3

Megasquirt II, two motors, one 565 NA. One 588, M4 Procharger. Stepping up to MS3 this winter.

still would love to figure out a way to get a 02 to live in our silent choice lightnings...would help !!

I have holley hp on mine. 509's with prochargers. Easy to work with. Alex Haxby is the man when it comes to the stuff too, runs perfect.

[ATTACH=CONFIG]510989[/ATTACH][ATTACH=CONFIG]510990[/ATTACH]
565 cu in, Motorola 555 ecm's tuned by Dustin Whipple,
750 hp 680 ft lbs trq

NICE! Who did the intake plenum, Throttle body.? I have one now, I am working the estimate, but am hesitant having to rely on calibration from others. Dustin; has done well; by me on his package cals, I guess; I need call him.. Any info sharing would be appreciated.
Mark