[AdamIsAdam]

(Not sure what happened this morning because I asked this question but the post is not here. I'll do it again...)

I'm wondering when is the best time to shift.

I think the ideal is that you shift out of gear at the RPM generating the max hp and (again, in theory) your next gear brings you to the RPM with the max torque. Is that true?

But what happens if your gearing and peak numbers don't allow for that perfect a match? Do you adjust the hp RPM shift point so that your next gear is still at peak torque or vice versa?

Take these dyno numbers that Cliff posted this morning. Let's use the first set of dyno numbers since the spread between hp and torque is wider, and let's assume an M21 wide ratio tranny to make it interesting (and more relevant to my car )

Do you shift out of 1st at around 5k at about peak HP even if that brings you to 2nd gear below 4k where torque is peak? Or do you hold 1st a few hundred extra RPM's to keep 2nd at 4k?

My next question is: How can I calculate RPM drop for each gear so i don't have to drive around with my nose in my tach at 5,000 RPM!