4 replies to this topic

[m_brady15]

Dear All,

I have a Metro Turbo that will hopefully be running at about 120bhp, with a standard gearbox.

What can I do to the gearbox to make it cope with the extra power im running through it without going with straight cut gears? The thing is that this will be my day to day car, therefore I don't want the constant screaming that coming with a straightcut gearbox.

Many thanks


Miles Brady

[In-a-mini]

a cross pin diff is a must really check everything to make sure there is no wear. dont be harsh with it once fitted its sharp gear changes and large amounts af torque from low speeds. but the diff should be your weakest point

[m_brady15]

a cross pin diff is a must really check everything to make sure there is no wear. dont be harsh with it once fitted its sharp gear changes and large amounts af torque from low speeds. but the diff should be your weakest point

Ok thanks mate.

Where is the best place to get a cross pin diff?

Who does the best value for money?

Many thanks

[roofless]

try the forum's very own 'guessworks' god of gearboxes and all things differential

[Guess-Works.com]

As above, an X-pin is a must have, also you'll want to be looking at a high grade competition layshaft and also good quality bearings...

Your problem may be the transfer gears, although 120hp is not much along side that with a forced induction motor is a good deal of torque... and torque is what kills gearboxes not power...

If you're intending on running helical drop gears you're going to have to be super critical on the endfloats on the primary and idler gears, any excessive float and they are going to move about and that will fairly quickly destroy both you gearbox and transfer cases...

You may have to make the choice between SC drop gears and reducing the torque of the engine.

Finally, if you want the gearbox to last then you're going to have to treat it with respect, no dropping a cog on boost, as this is a surefire way to strip the laygear of teeth.