BadJK

cud any on tell me what my max bhp my gear box will hold before it pops the car is currently running at 320bhp with no issue but im looking at taking it to 400 plus and wonderd if it wud last long the gear box is an 03 wrx ???

adzaves

Ive heard that you are running pretty much on the limit now for a standard wrx box. Suppose it would depend on certain driving styles though?

The STI box is supposed to be stronger by all accounts but not sure if yours can be made stronger or if you have to buy the whole STI one?

Im limited as to what I know, hope someone else can clear it up better for you !

Wurzel

iTrader: (1)

I was putting 361bhp and 367lbft through my standard MY00 gearbox with out an problems.

No idea how much longer it would last though.

The Chief

Depends how brutal you are

Sti will take 400 a 5 speed WRX well only a matter of time

New_scooby_04

iTrader: (4)

Torque, not bhp kills gearboxes. There is no set in stone limit, depends on how the car is mapped and driven and, of course, previous useage etc.. Certainly, low 300s are fine if carefully driven, any higher and you're increasingly risking it. Quite a few on here, me included are in the mid 300s and the box seems ok....touchwood etc..

Ns04

F1 CJE UK

iTrader: (8)

zen told me 350 ish was a safe level for a 06 WRX but i think the gearbox is different than other wrx due to the move up to 2.5

GazTheHat

If your torque gets close to starting with a "4", start saving.

jasonius

iTrader: (1)

Iirc, the 5sp was uprated ~2003 and again in 2005, which I believe is the same as used in post 2006 (ie 2.5) wrx's.

Given that the 2.5 wrx delivers a claimed 310ft-lb I would imagine, that with the warranty margin required by design, 350+ no problem. Probably 400 if driven with a little mechanical sympathy..

Black-Hawk

iTrader: (4)

Had to rebuild 3rd/4th on my 06 wrx at 5000miles but not sure if it was human error , its running iro 380bhp/370ftlbs its been fine since even after a tyre spining launch or two.

MaDaSS

As above, i too am running mid 300's through mine, but i must say where my gearbox is concerned, i am a wuss with it. I will not tempt fate! lol.

Aztec Performance Ltd

iTrader: (234)

A TD05-16g was enough to strip 2nd gear on mine.

That said, I drive it how its supposed to be driven and it will probably show its heels to most 400bhp cars.

Running uprated gearsets now.

Little point in having bags of power and having to take it easy, as you would be better off with less power and drive it hard imho.

DaveR

I've been running an MY02 WRX with a 2.5 litre 350bhp/350lbs ft conversion for over a year now without problems. Uprated clutch (AP), but standard gearbox.

Mind you, I don't Santa Pod it or anything - daily driver with 2 or 3 trackdays a year

BIG FUD

iTrader: (84)

As above 100%

leonpoole

I like your style

howellsy42

iv got a classic sti that is running about 330 with 320ibft and i poped my gear box 3 weeks ago just had it re built with a ap clucth and lighted flywheel

Black-Hawk

iTrader: (4)

Just got back from powerstation's RR she's 404lbf.ft now.,not bad for a wrx.

BadJK

thanx for the advice guys does any one know who sells the uprated gear set to go in my box if it goes **** up and wha sort of price????

Black-Hawk

iTrader: (4)

Good question, i may need one, just converted 404.3lbf.ft into nm its about 550nm,

F1 CJE UK

iTrader: (8)

as above think i will need that as well