Bulk rings and high revs
Turbo Mini Forums

I appreciate most people running over 9k rpm will be using dog boxes as they will be race cars, but I don't have the budget to stretch to a dog box for the 16v engine. The gear set to be used will be a Minispares Clubman set.

Will it be an issue shifting at such hight revs from the point of actually getting them to sync quickly, especially on the downshifts will the syncros / bulk rings be worked very hard compared to shifting at lower revs?

I have been considering running a 3.44 or 3.65 final drive, but then altering the drop gear ratio to reduce the overall speeds the internals will see.

Any thoughts on the subject?

Not much of an input but looking at rpm speed chart (guessworks) it apears what ur saying is correct the faster the gear set moves the larger the rpm gap is between gears makeing the syncrows work more to slow down/speed up to match up and nicely engage as we allready know
So as u say low fd and tall drops will let the engine rev more but let the box remain the same rpm altho not sure on the extra loads being put on the drops? Perhaps a turbo idler to help due to bigger needle rollers? Are you running sc dg?

I don't see the torque the drop gears will see as an issue. It should be less than 190 lb/ft, even then will still be running a relatively high final drive compared to most turbo motors.

Historic racers in australia (pre 1965,pre1972) all have to use standard boxes. SC, CR gearset and often rev around 9000rpm, but they are NA , and probably put out 140-150HP at flywheel.. again most use double grey diaphragm.. they synch okay and they last okay in a race setting,,, don't think anything revving at 9000 and meshing will be bullet proof though...

Personally, my thoughts are that you will be just fine. Stop thinking and start building.