Higher Octane Vs Hp Loss
Higher Octane Vs Hp Loss theoritcally speaking if you have tuned your car for 93 oct. (506rwhp N/A) and run 110 leaded, what is the estimated hp loss if you do not adjust timing for the high octane fuel? trying to settle an arguement 
370ci
11:1
ms4
prc stg 1
90/90
370ci
11:1
ms4
prc stg 1
90/90
there are a couple factors to take into account here. one is the leaded fuel which your o2 sensors wont like anyways. Higher octane is a "chemical retarder" so your right in mentioning the timing adjustment. but your timing could be off as much as 5-6 degrees and with that compression and cam you could be down 50hp not mention a little a little on the rich side as well. just dont run it is my .02.
there are a couple factors to take into account here. one is the leaded fuel which your o2 sensors wont like anyways. Higher octane is a "chemical retarder" so your right in mentioning the timing adjustment. but your timing could be off as much as 5-6 degrees and with that compression and cam you could be down 50hp not mention a little a little on the rich side as well. just dont run it is my .02.
6 & 8 Second Club
Joined: Aug 2006
Posts: 2,284
Likes: 0
From: Illinois, RT 66 dragway area
.
Don't know the formula. But I do know I test with 3 different octanes whenever I get a new engine. I've had a .1-.2 difference when over octaning an engine. All engines will have a sweet spot, you just have to find it.
.
Don't know the formula. But I do know I test with 3 different octanes whenever I get a new engine. I've had a .1-.2 difference when over octaning an engine. All engines will have a sweet spot, you just have to find it.
.
