Discussion
Thanks everyone for your input.
I've talked to Precat about his adaptation to use an M3 6-speed box - not trivial (start by sawing off the integral BMW bell housing...), plus it isn't compatible with TVR diff ratios so a BMW diff needs to be installed as well.
I agree that the T56 is too big and heavy - also has much greater transmission losses than a T5 and needs the exhausts to be re-routed (lower).
So, looks like I'll stick with 5-speed and see about putting a lower ratio in the diff to drop the revs in 5th. Always wanted to get to 100mph in third :-)
I've talked to Precat about his adaptation to use an M3 6-speed box - not trivial (start by sawing off the integral BMW bell housing...), plus it isn't compatible with TVR diff ratios so a BMW diff needs to be installed as well.
I agree that the T56 is too big and heavy - also has much greater transmission losses than a T5 and needs the exhausts to be re-routed (lower).
So, looks like I'll stick with 5-speed and see about putting a lower ratio in the diff to drop the revs in 5th. Always wanted to get to 100mph in third :-)
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