Any tips for shifting by time instead of rpm?

Chris Williams · 05-17-2010, 08:44 AM

Don't know what class you're running, but every Super Comp (and most Super class) racers I know shift on time. But they do it for a very specific reason. With the high-hp engines these days, you need to shift early to insure that the engine will not climb RPM when on the throttle stop. If you let the engine get high into it's power band while on the stop, it will be very inconsistent.

So we, like most people in SC, shift on time. We shift at 1sec, but I know people who are shifting at 0.1sec, heck I know people who start out in 2nd... all just to stay rock solid consistent when on the throttle stop. We used to shift at 1.2sec, but looked at the RPM data and after we added HP to the engine, it was climbing at bit on the stop, so we started shifting earlier.

Again, don't know if this is relevant to you, but there it is.
Chris

05-17-2010, 08:44 AM	#2
Chris Williams Member Join Date: Mar 2009 Location: Woodinville, WA Posts: 401 Likes: 0 Liked 0 Times in 0 Posts	Re: Any tips for shifting by time instead of rpm? Don't know what class you're running, but every Super Comp (and most Super class) racers I know shift on time. But they do it for a very specific reason. With the high-hp engines these days, you need to shift early to insure that the engine will not climb RPM when on the throttle stop. If you let the engine get high into it's power band while on the stop, it will be very inconsistent. So we, like most people in SC, shift on time. We shift at 1sec, but I know people who are shifting at 0.1sec, heck I know people who start out in 2nd... all just to stay rock solid consistent when on the throttle stop. We used to shift at 1.2sec, but looked at the RPM data and after we added HP to the engine, it was climbing at bit on the stop, so we started shifting earlier. Again, don't know if this is relevant to you, but there it is. Chris __________________ Chris Williams 6304 SC, TD, ET