Mech33

Hopefully this plot will make this a little clearer. This graphically shows the max available power in each gear as a function of vehicle speed. When the available power in the next gear exceeds the power in the current gear, then you should shift.

The 991 GT3 has a peak below redline, but despite that you see that the ideal shift points are at redline for 1st->2nd, 2nd->3rd, and 3rd->4th. But once you get to the 4th->5th shift (at 135 mph!) the gear ratio spacing becomes tight enough that you actually get some power benefit from shifting below redline. So the theoretically ideal shift points are:

1st->2nd: redline (9000 RPM)
2nd->3rd: redline (9000 RPM)
3rd->4th: redline (9000 RPM)
4th->5th: 8850 RPM (135 mph!)
5th->6th: 8750 RPM (160 mph!)
6th->7th: 8700 RPM (185 mph!)



I'd be happy to create a similar plot for the GT3 RS if someone has the Porsche-advertised power curve handy.

ipse dixit

Mech33

Has anyone seen an official 991 GT3RS power curve from Porsche? I've found the official GT3 curve, but I can't find an official RS curve. I think it would be interesting to overlay the two vs. speed in each gear.

Loess

Here is one.

Mech33

Thanks! Using that, here's an overlay of GT3 vs. RS power curves in each gear. Based on the plot, the ideal shift points for the GT3 RS are at redline for all gears, except maybe slightly below redline for the 6th -> 7th shift.