To add to this....

We went to the Shift-Sector 1/2 mile shootout in Coalinga, CA this spring with my buddies built LS9 powered turbo FD RX-7. With about 50 miles of engine break in on basic uploaded borrowed tune the Holley made revisions to the base tune......then we pretty much had to clean up idle, cold/hot start. The car was then driven to the event about 150 miles (50 miles away) until an oil cooler line ruptured putting the car on the trailer. The issue was fixed, car pressure washed, and then the next am it went to the event. He ended up beating an 1150rwhp+ Ford GT (supercar) twin turbo with nitrous setup in the domestic finals with his car. This was with no dyno tuning, about 1.5hrs worth of messing with the Holley software, and traction issues. His car went 193.5 in the 1/2 mile with around 150-200rwhp left on the plate. Next time out will be traction control and boost controller (he ran a manual one due to lack of time) working. He is shooting for 200mph+ in the 1/2 mile.

The car should trap in the high 170's or 180's in the 1/4.

Is the Holley system the atomic efi setup?

Holley HP has less inputs/outputs.... the Holley Dominator has more inputs/outputs and can control automatic transmissions.

Here is a good testament to how great it works. 101mm Turbo LS V8 running 500lb Moran injectors. He gave up on the factory computer after wasting many many hours.
Wired up the Holley.... loaded in a base file.... badda bing... badda bang. It runs. Dyno Tuning in 1 week.
Read post #178
http://ls1tech.com/forums/forced-ind...-87-gn-18.html

I'm running Holley efi and very happy with it ..at first had a few idle issues but once got around them it had ran great! Very happy!