Z me Pro

how much can the pro5 tranny take (5spd) realisticly. I have heard hp which sounds awfully low. If this is the case, how do you make it so the tranny can take more? how much would this cost? are there replacement trannys?

igdrasil

You will need custom gears.
A company called EMCO does them. Also tripoint can do that also.
Well...about how much power can this tranny handle? I think is good enough for 200lb/ft of torque.

Im not sure for what im about to say now but I think that you can use 626 gears which also has different ratios.

Installshield

Its the case, not the internals (other than the shift forks) from what I can remember...

It will also depend on a number of other factors...If you tune the engine to create a ton of power and not upgrade the diff, drive shafts, and clutch you will probably never break the gearbox. If however you upgrade every piece of the drivetrain possible, meaning the things mentioned and possibly even tires, the gearbox quickly becomes the weakest link...The more things upgraded the more stress directed at the box, the less things upgraded the more likely those specific things will fail before the box...

UCSBgeek

It's torque you need to worry about -- not HP.

VagaBond-X

yup i always thought it was torque that killed the trannys, and not the HP, you can run as much hp as you want, but you have to watch out with how much torque you make!!! i think it was somewhere around 225lbs/ft that the G series tranny can handle

you lucky SOBs, we heard the F series tranny that i got, is almost at its maximum torque capacity already with my 120lbs/ft

igdrasil

Ive read the 3rd gear is the weakest gear in the tranny. the 240hp N/A competition Protege has custom gears in 3rd, 4th, and 5th.
The case will hold up if you gear it correctly.

Installshield

I vaguely remember reading that they were not allowed to modify the gearbox in any way other than the external stuff (clutch...etc.), but you could be right, and shorter gearing would make a lot more sense with their peaky engines and types of tracks...But FWIW those cars do not make nearly that much torque, and the gearing would most likely be for better rev band control and acceleration in higher gears, not to strengthen the box...

and you don't just have to worry about torque, well sort of...To make ridiculous power NA you have to rev, and from what I have read the G15's would never enjoy a F20A's 9000rpm stock...So meaning: torque is directly related to stress on the box, but a function of power is revs, and the box will limit revs as well as the engine design...but I don't think an FS will rev high enough to compromise the transaxle without $8,000 + work, and I am starting to ramble big time...