Re: Spark Timing
 

My AF/S Shelby w/ VP116 & 25+ PSI boost liked 38-40 degrees total!

Re: Spark Timing
 

That's because you were trying to use VP-116 and 25. Burns too slow and kills your EGTs and boost.

Re: Spark Timing
 

I actually ran quicker with pump gas. For nhra races I used the cheapest acceptable fuel I could get.
EGT's were 1800 at the finish line on the best runs.

Re: Spark Timing
 

This was when dialing in with a lap-top was "exotic" back in the dinosaur age of the mid '90's. I ran it rich with over sized injector's after melting three heads and knocking the crowns off three sets of factory pistons. Once I figured rich was not fast but safe, I never had a problem again. I always figured a sharper tuner than I could get it into the 12's. It took about 10 years for anybody to top my 13.26 record so it must not have been all bad! :D

Re: Spark Timing
 

Jeff the trick was to use pistons with over 100,000 miles on them. They are coated with carbon. I never had any tuning, just fuel pressure. My turbo wouldn't put out more than 18 pounds in the best conditions, but it was the small mitsubishi not the garret.
Ran a 13.46 with the Spirit on pump gas. On a mineshart day at Cecil County.

Re: Spark Timing
 

This is a loaded question. BST differs from the dyno to race track in many cases. On our open chamber 10:1 engines we run anywhere from 42-46 degrees. BSFC numbers will vary with BARO (CALT) etc. It's a at the track tuning.






MJ