What's everyone shooting for at peak torque and at peak power? I'm not looking for people to expose trade secrets, just in general terms.

On stock turbo (actually, mine is a TME, but same difference),

Peak torque, I'm shooting for 8 -10 degrees advance with a/f of 11.8 - 12.2.

At peak power (7500 rpm), it's 21 degrees and a/f of 11.2-11/5. I can't run any leaner than that, my egt's start to creep in 5th gear.

Anyone else care to share their opinion?

 

You won't see much, if any power gain, by leaning the A/F past 11.5:1. I prefer to keep it around 11.2-11.5 in the torque peak, the additonal fuel has somewhat of a cooling effect and can allow you to advance the timing more without detonation.

You're going about it a little backwards though. You have it leaner in the torque peak and richer at higher rpms. It should be the other way around. More torque requires more fuel and adding fuel when VE is dropping kills power.

 

yeah, the general view I think says run a/f around 11.2-11.5 at peak torque, but very few I've talked to have said advance the timining in that region beyond 8-10. If you can run that timing at a leaner a/f, what should you do? Richen it up or advance timing? It would be nice to start a good discussion on varying viewpoints, as each has it's advantages/disadvantages I'm sure, and now that more and more "individuals" like myself, start to create their own tunes, it would be good to compare notes and not blow up engines in the process.

Thanks for the feedback.