redline/peak H.P/ & H.P curve-When to shift?? :) intresting???

andre12031948 · 09-04-2013, 04:48 PM

Quote:

Originally Posted by Apollo8642

In my opinion and this is sure fire way to figure this out. Take your car to a dyno, get a few pulls in, then check your torque, horse power curves and where they start and drop, that will help tell you where you need to shift. You can even data log shifts on a dyno so you can see what your power does in a down and up shift.

I usuall shift around 6500 rpms plus or minus for whatever I might be doing, my stock clutch likes to cook when I shift at red line. (swapping to a South Bend stage 3 setup very soon)

Here is a dyno sheet from Z1 Motorsports with uprev, and off this I would shift around 6800 to 6900 rpms but you should get your own results with your car, also view it with smoothing off might help out as well.

When I drive on the street I shift between 2k & 3k max. When I drag race or would try my hand on a road track with curves & straight ways, or even a country road I drive this way.
Accelerating at the drag strip, according to this chart, which stops at 7.5 rpm, I would shift(power) at apx. 8k. so when it drops, it ends up someplace where the H.P is going up toward the peak. Same if I was on a straight way of a road track. Turq. is only a concern when I accelerate from a dead start, a slow roll, or after down shifting on a turn then accelerating. After I'm moving at a drag strip or a straight way of a road, I only pay attention at rpm to be at max H.P in the gear drop. When I'm moving, h.p. h.p. hp. is all I care about.

Actually, this chart shows me that it could use 4:08 gears or maybe shifting above 8k. My tune/chart has a long flat line from 6k to 7.5k.

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