Payback hits the chassis dyno

[Vegas69]

Originally Posted by ProdigyCustoms

The 100 octane thing is a myth. if the car does not need it it will run faster on lower octane.

The reason there are different race octanes is you only want to run the lowest you can get away with. My street racer is a pump gas motor and looses a full 1/10th on 110 octane on motor. But needs the 110 to be safe on nitrous.

So long story short, at 9:1 compression, 100 octane would steal power.

500HP at the tires at 3500LBS is plenty to run high 10s. One trip to the dragstrip and I bet I am sending him double adjustable shocks and Prodigy Bar ends!

I agree that to much octane will actually rob power. We were just talking about a mix to say 95-97 octane where I could go to 44 degrees total and not worry about detonation to try and get that 500/500. Going from 39 to 41 gained me 8 ftlbs and a 2 horse. Every time I added timing I gained. He had mentioned he has seen many big blocks love 44 degrees due to the large head chamber. If I was to try for the 500/500 I would mix 50/50 91/100 unleaded, change the pre load on the lifters to one full turn for better performance over 6k, and try 42 then 44 degrees of timing. I won't dyno it again unless I make a major change. To big a hastle getting it on that rack.