98prodrivewrs

Hi planning to get my car up to 450 bhp. What gearbox would be up to the job?
Any ideas on prices and fitting would be helpfull. As well as any changes in order to fit. My car is a uk 98
Thanks Mark

stevebt

iTrader: (8)

6 speed gear box should do you, mine worked out about £2k fitted

98prodrivewrs

Thanks. Was that a new box of used. Whats the scoob like with a 6 speed, whats the gearing like? Whats the performance in each gear? (speed etc) Who did you get it from, whats the make. A lot of questions quite new to performance tuning.

Foxmod

Hi mate,

6 Speed is fitted to the New Age STi's, see the subaru web site for the figures. I've been told it's £6K new

Dave

Neilo

you can get them supplied and fitted for about 3-3.5k from roger clark motorsport
i believe

stevebt

iTrader: (8)

i bought the box from a subaru breakers and it was fitted by a local garage. if your planning on fitting one you need more than just the gear box. i preferred my old RA gearbox that i blew up to the 6 speed but its tough acceleration is ok but not as good as my 5 speed IMO

98prodrivewrs

Any other gearboxes good for 450. Or can you buy stronger parts and rebuild it. What whould be the best idea

RoRu

You say that your quite new to tuning cars, do you understand the amount of time and money your gonna need to get upto that sort of power?
It might be a better idea asking question about pistons, rods, cranks, turbos, fuel systems etc before you worry about the gearbox.

stevebt

iTrader: (8)

tell me about it, i wont add my costs up anymore

Peanuts

iTrader: (15)

if your brave then you can try your luck with an sti5/6 box, you'll need the corresponding diff with it as well.
if your reasonably mechanically sympathetic then its been proven to take 500+ bhp.
if your not so brave, or you try it and trash the gearset, then you can opt for a ppg at about £2k + your own fifth gear, they also have a dog option for the deaf and heavy footed among us

98prodrivewrs

Yea had the car just over 2 years. Uk with full prodrive wr sport upgrade. As well as that i have uprated fuel pump,fcd,fmic,induction kit, de-cat,up pipe, greddy eo1 boost controler,greddy e-manage and uprated leads and spark plugs. Currently awaiting bigger turbo, injectors,headers and uprated clutch. So looking for gearbox might as well do it all at the same time.

Herd that if the car is well set up you can run about 400 of standard internals. So will keep cash aside for if or when it blows.

98prodrivewrs

Do you know rougthly how much a sti5/6 gearbox and diff would cost including fitting

Thanks for all your replies
(all relevant info welcome)

stevebt

iTrader: (8)

i trashed one of those before i put my six speed in

alanbell

iTrader: (6)

I broke 2 uk boxes and 1 wrx box , then put a 6 speed in and no probs >> except if you are going to race >> drag your car , your better keeping a good 5 speed, I think Harvey had >> or has ??? a sti box in his very high bhp wagon, Others are going for the 5 speed box rebuild >> Loads off money, >> To add my classic was about 360 380 bhp >> ishh , anyway good luck with yours , Alan.

98prodrivewrs

Hi alanbell how much would the sti box and diffs cost any ideas. Will be looking to do some quarter miles. Could the 6 speed cope with much 1/4 mile runs?

98prodrivewrs

Who supplied your box?

alanbell

iTrader: (6)

6 speed will cope very well , >> Dont think anyone has broken one yet !! But 6 speed slower on drag strip >> You need to use more gears ?? been there done that, If you want to spend LOADS of £££££ get yor box uprated, sti 5/6 with diff about (isshhh) £500 to £600 << isshh, If you can find one, cheers,

98prodrivewrs

Cheers

john banks

If you are trying to run 400 BHP on your 2.0 then I would go for a good 5 speed STi 5/6 box, change the rear diff to keep the short gearing. The torque will be modest on the 2.0 which will protect the gearbox to some degree.

Sounds like you have the right list of stuff re the power. Pulling it all together with the right turbo and the right map are the key things to get right. You'll need the ignition harness for the E-manage if you haven't already.

911

Two things:

1
My 407/340 Sti v3 is on it's original trans and has endured some very hard drag starts over a 3 year period at 314 bhp/280 torque and this year the 407/340 level all on very sticky Kumho V70's. The tyre grip must not be ignored here IMHO as the grippy tyres resist spinning so much more when dumping the clutch.
If you can ease the shock to the trans so much the better (hence using an organic clutch?)
2
API will sell you/fit for you a late V5/6 trans or a range of 6 speeders.
A friend of mine who races a Legacy bought the whole 6 speeder 'kit' from a breakers for £1400 delivered to his door on a pallet.
Solid 5 speeders are about 3K with ppg kits (find Zen Performance)
I think V6 trans are about £600 without dccd.

All above plus fitting.
Remember a 6 speeder can have the larger clutch too.

Graham.

98prodrivewrs

Yea got all the stuff imentioned fitted looking for bigger injectors, clutch and have my eye on a turbo just not sure how easily it will be to fit(find out how easily it will go on next week) its a Greddy TD06 will that do? Apart from the stuff i have listed can you think of anything else i may need?

Have got a big brake kit,braided hoses, performance rear pads and disks as well as uprated suspension.(came with the full prodrive wr upgrade in 98 says Prodrive and sti on shocks) So hope that brakes and suspension will cope.

Hope engine will cope with 400bhp for best part of a year. On doing searches seems a few do when treated well. Any ideas on amount of cars that are running around 400bhp on uk internals?

98prodrivewrs

Hi 911 whats the ppg kit? Not clued up much on performance tuning. Would the sti5/6 box and diff cope

alanbell

iTrader: (6)

check the greddy has the extra kit to fit a subaru, Before you buy it ,

98prodrivewrs

Sorry meant to say that i had a lot of the stuff fitted

Fitted following
de-cat, up pipe, induction kit, performance plugs and leads, fmic, fuel pump, greddy e-manage,greddy e-01 boost controler, fcd, and dump valve. Car already had prodrive exhaust, ecu (work done to it says prodrive and sti on case now not sure what they done) and uprated intercooler piping (off now for fmic)

wanted as follows
Bigger turbo (may have checking fitting), Bigger injectors(looking) gearbox (offered a sti 5/6 one and diff just have to work out how to get it transported) uprated clutch ( had paid for one but cancled order want something that will handle the power, hopefully not to heavy or impractical)

Think i remembered it all if not, anything else anyone can think off?

Thanks everyone for all help and pointers so far, though think i could have a lot more questions to ask

911

The PPG kit is a ange of helical or straight cut/ synchro or dog selected tough gearsets for the 5 speed box.
The hardened drag racers on here use them, and Zen Performance sell the kits.
Pavlo = Paul = Zen.
Good luck with the conversion.
You should 'feature' the car and your antics in Project section to amuse us all

Graham.

Cheryl

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98prodrivewrs

Thanks for all the advice guys

C 8HEP

ive got a v2 ra with dccd. if i want a 6 speed but keep dccd do i need a spec c, 6 speed box?

APIDavid

iTrader: (4)

To put a 6 speed in your car you'll need a gearbox from a 2002 on car from Japan with dccd [ not necessarily a spec C] OR a box from a written off WR1.

Either will have 3.9 front diff ratios and you'll need to fit a 3.9 rear diff to match. It is just possible that your RA may have a 3.9 rear diff already, as some do and a quote on here of your original transmission number will tell me.

The WR1 box - being Euro spec - will have a 1.1 : 1 drop gear set and uses a 3.545 rear diff which still means that you'll need a rear diff change - just for a different ratio !!

If that's not clear call me.

David APi Engines / APi Impreza
www.apiengines.com

Adam M

speak to zenn or lateral performance.

you really want a 5 speed as the 6 speed isn't great for proper power output cars with wider torque bands, unless you get forester or custom ratios that is.