most power through a standard gearbox
 

hi my mate at work who is a ford fan was surprised how much power a standard scooby gearbox will take, i know a classic 5 speed is about 350bhp but how much will a newage take cheers j

i think martyn jefferies is running stock 5 speed box and running over 500bhp

Its not the bhp, its the torque that you need to compare ;)

Tony:)

how much torque will they take and what about the newage 6 speed , i think he is thinking of a change cheers j

6 speed will take big power and hARD use, 600 bhp +

Anything above 300 on a uk classic box and 320lbs on a classic late sti and newage wrx 2ltr box and you should start to consider upgrading if you want to carry on tuning.

Tony:)

he was a cosworth chap so would be looking at sti's j

Id go new age sti then, JDM twin scroll if he can get one ;)

Tony:)

Was talking about this with the guys at Scooby Clinic on sat.

365 bhp is the max

It depends on driving style too, thats why people can get 400bhp+

Whoops thats a classic box im on about not newage soz

martyn's is an sti 5/6 box, quite a bit stronger than the previous sti's for some reason......

520lbft seemed to be the breaking point :thumb:

:notworthy:notworthy:notworthy:notworthy

On the dyno...........

Looks like yours was a well looked after box, without the dodgy nut ;)

Tony:D

Martyn was the car using a standard wrx box or did you put an sti box in? Having a 2.1 built at EngineTuner atm so hoping my my99 uk box will hold......at least for a short while :lol1:

My box was the original standard fitment box for a JDM version 5 WRX, lasted an entire season of Prostreet and some 30-35 hard launches before finally throwing in the towel on a dyno day in October. 4th gear let go and was all that reqd replacing. Box now back in again and all is well :D.

Obviously I can't say how long anyone elses will last.

:confused:really not sure what to go for with the wagon,dont wont to ruin it,is it just pot luck? 300? 350?? the 5 speed is probably fine if u drive with sympothy at 330 lbft but 350? i think its hit and miss as others have broke the 5 speed running less than 300lbft.:wonder:

This I like the sound of :thumb:

i do 2,but ive heard many people braking the uk 5 speed at 350lb and less,im running 303lbft and its never missed a beat and feels identical to when the car was only 215lbft,im in a dilemma of going for 330ish or 350ish because the 5 speed is my main concern!im starting to think it would make no odds,but who knows????:cuckoo::wonder:

My last classic MY95 UK's box let go at 300/300, so i guess it's a lot to do with luck, my RA's at 335/320, and holding fine at the mo. Will be running a little more when Api have finished the forged build, so will be interesting to see how it lasts.

My bugeye 5 speed was OK with the TD05 at about 350 BHP but as soon as I added methanol injection and ran at 400 BHP and about 350 torque it smashed 2 gearboxes in 8 weeks........ now run a Jap 6 speed (API) but keep looking for 7th gear on the motorwar LOL

Shaun

how much torque were u running with the td05?

oh,and do u LAUNCH ETC?lol

99green wagon.....about 320 :(

Shaun

I broke 3rd gear both times.....it might be due to the fact that for the newage box 3rd gear is the default option for doing anything....whatever gear you were in to start with. I'll just drop from 5th to 3rd to overtake LOL :)

:( so were u launching/driving hard?or do u drive with alot of mechanical sympothy?:D

99 GreenWagon

Both times I was dropping down into 3rd to overtake a tosser on the A69 and when the turbo hit boost the gearbox just crapped itself !! Not lauching from a standing start.

The second time it happened I drove around for a month or so just avoiding 3rd gear until API could sort it out.........made some funny noises and reverse was a nigtmmare to get into LOL

Shaun

oh,so do u think that 320 lbft could be classed as the so called limit?theres me thinking 330?350? its neither here nor there? the reason im asking is because this level depends on wether i opt for bigger injectors or not.:thumb:im thinking maybe just go 330 to hopefully be safe.....ish?:lol1:

As I've said before I have had customers running close up to 400hp on a TY752 Vers 3 transmission and never broken it in 2 years of competition [ winning as well ! ] And guys on TY754 in road cars with barely 300 hp breaking 2nd or 3rd gear regularly.

Remember that any TY 752 is at least 12 years old with 12 years of metal fatigue. Some TY754's are 11 years old............

I think that somewhere between 350 - 380 hp and 350 - 360 ft lbs is probably Ok for a 754 - above that level and you're on borrowed time, BUT, the later 2.0 WRX 5 speeders are stronger again, especially the drop gear bearings at the back which are usually the source of most noises. So a late blob eye 2.0 5 speed is about as good as they get.

David

ah,so which one is on my99? sorry but i dont know lol

^ TY754

Im currently contemplating a power hike, and hoping my TY754 STi5 box will accept it :thumb:

Intersting read good to know they can take the power if they're looked after properly