Shift points
#1
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Is anyone able to help out or let me know of a formula/calculator to work out the ideal shift points for my car?
T56, LS1 Holden Commodore, turbo, 3.91 ratio, 11.4 @ 127mph
still undecided on tyre choice (26 vs 28) which is why I'm trying to work out what is more ideal, running a 26" tyre and trapping at 6400rpm or running a 28" tyre and trapping at 6100rpm.
Max power approx 5300rpm and max torque approx 4400rpm
![](http://www.mrjj.net/gallery/albums/dyno/dyno20060819torque.sized.jpg)
T56, LS1 Holden Commodore, turbo, 3.91 ratio, 11.4 @ 127mph
still undecided on tyre choice (26 vs 28) which is why I'm trying to work out what is more ideal, running a 26" tyre and trapping at 6400rpm or running a 28" tyre and trapping at 6100rpm.
Max power approx 5300rpm and max torque approx 4400rpm
![](http://www.mrjj.net/gallery/albums/dyno/dyno20060819torque.sized.jpg)
![](http://www.mrjj.net/gallery/albums/dyno/dyno20070123boost.jpg)