I had my car dyno tuned on a DynoJet with LS1 Edit with my mods in Sig. My initial run before tuning was 329 rwhp 339 rwtq with my AF ratio steadily falling from 12.5 to 11.9 at red line. After a few more runs and some tuning, I was at 337 rwhp and 346 rwtq with my AF ratio starting off at 12.0 at 2,500 RPM and steadily lowering to 11.5 at 5,000 RPMs and finishing up at 11.9 at redline. Does this make sense? Why would they lower my AF ratio that low? And how was I able to somehow gain 8 hp and 7 tq with them lowering my AF ratio below 12.0? Would I have higher numbers if my AF was around 12.9? I will try to find someone with a digital camera so I can post the graph soon.

 

Must be another "ancient dyno tune secret"...

Unless it is a Dyno guess or "is this right for what I have" I do not think anyone here has any answers.

 

Any answer wasn't real important anyway. I'm happy with the numbers and everything so there is no problems or let downs, I was just curious. I'll ask the guy who tuned it next time I stop over by the shop. I'll still post up the dyno graph though within a few days.
Thanks-

 

Looks like they did that because they did not know that LS1's dont need alot of timing and like to run leaner. So maybe they thought lets keep adding timing till the power goes up, but they also had to keep adding fuel to compensate for the knock.

Rick