[Chris Williams]

Shift on time, not on RPM. Trust me, been there, done that, got the scars. Try something like 1.5 seconds out. You're looking for a time that makes the car run really stable on the stop -- the RPMs on the stop don't vary. Once you find a time that works, never touch it again. Makes for too many variables.

Lots of ideas on what the best "dead stall" (RPM when on the stop) is. I think you should pick a number that gets you to a time on the stop of between 1.5 and 2.5 seconds. If you're on it less than that, it'll be hard to find enough variability for all conditions. If you're on it longer than three seconds, you'll find it hard to be consistent. I think higher RPMs are better, but that's just a preference to not drop the engine way out of its power band. Here again, once you find a dead stall, stick with it. In fact, check it at the beginning of each weekend to be sure it's set the same.

As for what start/stop, there are a lot of opinions on this, but I'm a start at 0.00 guy. Then take a stab at an end time, work from there. First time, it's a total crap shoot (esp. with the dead stall discussion above). Once you have a run, swing the time wildly (like add/subtract a second) and run again. That'll give you a ratio, and you're good to go from there.

HTH,
Chris