hey guys at what bhp is it adviced to change the gearbox and clutch?

and what sort of gearbox would need to be fitted?

i thought a gearbox was a gearbox regardless of the bhp

 

Around 330bhp is the advised level max on a std box.

 

so what would you need to replace it with?

 

Adzer, you make no mention of what year/variant you have. Would be helpful, more so for yourself.

Around 500 of both is apparently fine on a standard box. Just not a 5 speed.

 

I've got a 53 wrx and its running 356.BHP and I've not had a problem yet on a standed box and clutch

 

sorry its a 95 wrx i have, gonna fit a cdb with forge internals and v2 sti heads that are ported and polished. car is fully decatted. k & n induction kit.
will fit bigger injectors and uprated fuel pump too but dunno what sort of turbo i'd be using. so if anyone has a rough idea of what bhp it could be making to advise me what clutch and box i'd need that would be great

 

main thing that will decide the level of power you will run is the part you havent decided on....

 

Power will depend on Turbo you choose. If you are sticking with what you have listed above and sticking with stock turbo i would just get a Uprated organic clutch and use the stock gearbox.

What are you doing for an ECU?

If you could say what kind of power you want. We could help spec what you need etc.

 

eventually i'd like to get the car running to itd full potential which could be near 500bhp with the right turbo, injectors and ecu??

 

Prepare for bags of LAG if your gunning for 500BHP on a 2.0

 

Ok you might as well get a 6 Speed box out the newer impreza's or a PPG box.

 

hmmmm never thought about lag lol, currently have a td05 16g turbo how much will that go upto?

 

340/340 ish on a 2.0, not really going to be pushing a built CDB.

But the 16g is quite capable of destroying a standard box.

 

alot depends on how you drive it, i drive mine like an **** and done a box at 250bhp, 280 and with a fully rebuilt late spec 5 speed its going again at 330