Thanks for the excellent info Mike.
The Box I'm looking at is the R154 5 speed unit. From looking at your links and doing a bit more searching on this box I've only read good things. Some people quoting 500-600Hp. They also seem to be popular with V8 conversions into Toyota 4x4s and that seems like a punishing application to me.
The rear end ratio I'm using is 3.45/1 diff and the ratios in the R154 are 1 = 3.25, 2 = 1.95, 3 = 1.30, 4 = 1.0 OD = 0.75. From the spread sheet I've put these into they look like a good selection of ratios.
Hi Craig,
I spoke to Rod Hadfield about conversion kits and he can supply an alloy bellhousing to suit along with a clutch plate. I'm a bit paranoid about having the clutch trying to hang onto so much HP right beside my legs so I'm keen on using a steel scatter shield. It wouldn't worry me so much in a normal car with a steel floor and the motor and box a lot further forward.
Mike's suggestion of using an aftermarket Supra clutch is a good one. There seem to be quite a few twin a and triple plate setups available that would have less rotating inertia than the 12" Chev clutch.
The pic on Rod's site is a standard Supra box, the Turbo box looks like that one on sterroids and is about 10Kg heavier. Below is about the best pic I've been able to find.
I've been trying to get some measurements on the box especially the shifter location. It definitely isn't as far back as the BT56 and probably a little further forward than the rear position on a Tremec. I figure I'll make a bent forward shifter a'la the original Cobras if it's not to far back.
Cheers
