6 Speed Box

green_goblin · October 9, 2009

Hi, just looking for some tech help!!

Does anyone know what is involved to change the 99 classic 5 speed to a 6 speed?? just looking for some general info on approx cost to do the job, ie how much it will cost for the parts as i would be doing it myself, also what needs changing??

I take it from what i read the 6 speed boxes should be good for up to 600bhp is this correct??

Cheers

Jason

fai17 · October 9, 2009

Not entirely sure what you need for the conversion but yes the 6sp box is good for a little bit for;

ciaranrb5 · October 10, 2009

Yes heard they are pretty strong. I was looking for one and the seem to come in about £2kish

From what I know I think you will need prop, correct ratio rear diff and drive shafts and possibly the rear hubs

A 6 speed from a uk car should actually go straight on with your standard diff according to a few things I have read.

I would ceheck this for definate though.

I think I will be going PPG as people complain you are always changing gear as the gears are shorter due to it being a 6 speed.

Also I can't resist the sound of a straight cut box.

mystery machine · October 10, 2009

you are always changing gear as the gears are shorter due to it being a 6 speed.

Yes - and it means you can always find the right gear!

I'd take a 7-speed if they did one...

mystery machine · October 10, 2009

P.S. I believe that the earlier 6-speeders were lower-geared than the more recent ones... the change might've been made when they switched to the 2.5L, but I'm not 100% about that.

ciaranrb5 · October 10, 2009

P.S. I believe that the earlier 6-speeders were lower-geared than the more recent ones... the change might've been made when they switched to the 2.5L, but I'm not 100% about that.

Yes think your right hawkeye sti's and 6 speed Forresters have a longer ratio 6 speed box meaning higher speed capabilities in each gear.

When i said the gears were shorter in a 6 speed i meant gear ratio no gearlever throw. My 5 speed is braw with the short shift

green_goblin · October 10, 2009

Cheers for the info guys

The only reason im thinking of going 6 speed was because i have heard alot of things about people breaking the ppg's as first and second are only rated to 400bhp and its not until further up the box that you get 600bhp rated, the last thing i wanted to do was loose time up the strip by changing gear more but what do you do.....put in ppg and be scared to rip it up the track incase you break it or get a 6 speed which seems to be a bit stronger and loose a little time!! aaaaarrrghhh dont know what to do!! its a hard choice

Edited October 10, 2009 by green_goblin

sparky_sj04 · October 10, 2009

Cheers for the info guys
The only reason im thinking of going 6 speed was because i have heard alot of things about people breaking the ppg's as first and second are only rated to 400bhp and its not until further up the box that you get 600bhp rated, the last thing i wanted to do was loose time up the strip by changing gear more but what do you do.....put in ppg and be scared to rip it up the track incase you break it or get a 6 speed which seems to be a bit stronger and loose a little time!! aaaaarrrghhh dont know what to do!! its a hard choice

If the PPG is rated for 400bhp in first and second I would think that's for the helical cut. The straight cut synchro will be rated for a good bit more.

If I was you I would have a look at this and phone them.

http://www.zenperformance.co.uk/p/drivetrain

Good luck.

Mark

green_goblin · October 10, 2009

If the PPG is rated for 400bhp in first and second I would think that's for the helical cut. The straight cut synchro will be rated for a good bit more.
If I was you I would have a look at this and phone them.

http://www.zenperformance.co.uk/p/drivetrain

Good luck.

Mark

Cheers Sparky will give them a call when i get home

mystery machine · October 10, 2009

When i said the gears were shorter in a 6 speed i meant gear ratio no gearlever throw.

Aye, that's what I was on about too - the closer ratios make it easier to stay wherever in the rev range it is that you want to be. I love it, one of the nicest features of the STI

My 5 speed is braw with the short shift

I'm intrigued by the quickshift linkage - do you know if they do one for the 6-speed?

braveheart · October 10, 2009

Cheers Sparky will give them a call when i get home

Hi Jase, i have been running PPG straight Cut for the last 2 years mate and have never had an issue....My mate Damien thats comming up to Crail runs it also in his P1 and also believe Andy F runs PPG, if you can put up with the noise then its for winners in my eyes..i have driven 6 speed also to see if what the diffrence, and in my oppinion the PPG was the better option for the track and for Crail..but it's people personel prefrence and also the money factor...

Chris

sparky_sj04 · October 10, 2009

I'm intrigued by the quickshift linkage - do you know if they do one for the 6-speed?

GFB do one. As do Prodrive (as fitted to RB320) - but the Prodrive is well expensive. Speak to Duncan at Hypertech about the GFB. Supposedly shortens the throw between 3rd and 4th by about 40%.. but can't remember the exact figures.

green_goblin · October 10, 2009

Hi Jase, i have been running PPG straight Cut for the last 2 years mate and have never had an issue....My mate Damien thats comming up to Crail runs it also in his P1 and also believe Andy F runs PPG, if you can put up with the noise then its for winners in my eyes..i have driven 6 speed also to see if what the diffrence, and in my oppinion the PPG was the better option for the track and for Crail..but it's people personel prefrence and also the money factor...

Chris

Moneys not really an issue Chris, i had just heard that andy had broke his ppg before and read a few other things about people breaking them so was a bit scared of paying over 3k to break it!! but from what you guys are saying i think i will go ppg!! just wish i could catch up with one of you guys sometime to hear what its like before i go for it!!!

Jase

mystery machine · October 10, 2009

GFB do one. As do Prodrive (as fitted to RB320) - but the Prodrive is well expensive. Speak to Duncan at Hypertech about the GFB. Supposedly shortens the throw between 3rd and 4th by about 40%.. but can't remember the exact figures.

Cheers, Mark - I'll need to see if I can have a noodle with someone's RB320 'box - get an idea of what it'd feel like.

soundie · October 10, 2009

i'v e heard stories of people having to rebuild their straight cut dog boxes quite a lot, but I think the syncros a bit less brittle. Have also heard of a batch of ppg that were jumping out of gear (4th i think) a problem that ppg were well aware of and were solving. (bout 3 months ago)

I almost went for a helical syncro box, but went to the 6 speed instead and love it.

you need to get matching diffs and therefore new (newer) rear hubs - the rear brembos that came too were a bonus for me!

also took the opportunity to do uprate clutch and flywheel, but then, you'd probably do that anyway with a new ppg.

cost was abotu 1800 box only, 2.1k with hubs, calipers, diffs + linkages. all in all with my new clutch and flywheel plus labour its more like 2.7k. great option.. the smoother option imo, i've got it with helix autosport c+fh and feels almost standard! could imagine a straight cut ppg with maybe a double plate clutch would feel more like a proper racer. strokes and folks.

Cheers, Chris.

green_goblin · October 10, 2009

i'v e heard stories of people having to rebuild their straight cut dog boxes quite a lot, but I think the syncros a bit less brittle. Have also heard of a batch of ppg that were jumping out of gear (4th i think) a problem that ppg were well aware of and were solving. (bout 3 months ago)
I almost went for a helical syncro box, but went to the 6 speed instead and love it.

you need to get matching diffs and therefore new (newer) rear hubs - the rear brembos that came too were a bonus for me!

also took the opportunity to do uprate clutch and flywheel, but then, you'd probably do that anyway with a new ppg.

cost was abotu 1800 box only, 2.1k with hubs, calipers, diffs + linkages. all in all with my new clutch and flywheel plus labour its more like 2.7k. great option.. the smoother option imo, i've got it with helix autosport c+fh and feels almost standard! could imagine a straight cut ppg with maybe a double plate clutch would feel more like a proper racer. strokes and folks.

Cheers, Chris.

Yeh i had heard similar stuff about the straight cut boxes!! I will be going with a twin plate hyper exedi clutch as i will need that to take to power me thinks!!

Cheers for the info Chris

ciaranrb5 · October 11, 2009

There is a fair difference in price between PPG built and fitted and a 6 speed bought and fitted API quoted me £3400 for a built straight cut PPG box with billet selector forks and I would need to provide a TY754 gearbox casing.

colin_ross · October 11, 2009

In my opinion if you can find a 6 speed with the right (long) rations then I'd go for that. If you do fubar anything parts are readily available at any subaru dealer and it'll be strong enough for 99% of users. Plus it's nice and quiet and is easy to live with. The shorter ration boxes are meant to be just as strong but I'd spend more time in neutral then I do in gear as I'm throwing gears at it like mad as it is. I think I get max 3 or 4 seconds out of 3rd gear as it is if I'm nailling it.

I've got a ppg straight cut in mine. I've got it because I got the chance of it cheap, lighter and the ratios suited me. So far it's been strong enough but it is harder work. For an everyday car I wouldn't even consider it.

jimmy_AyrshireScoobs · October 11, 2009

dont get the 6 speed mate,im fed up with it having to change every 2 secs.

when overtaking from 50mph in 3rd gear full throttle,lucky if i can get level with the car before needing to change up,i preffered the 5 speed in my classic.

mystery machine · October 11, 2009

dont get the 6 speed mate,im fed up with it having to change every 2 secs.
when overtaking from 50mph in 3rd gear full throttle,lucky if i can get level with the car before needing to change up,i preffered the 5 speed in my classic.

When was your gearbox made?

green_goblin · October 11, 2009

I sent Frank STI a pm about his box, would his be the longer or shorter ratios.....its a 53 plate??

Cheers

Jase

mystery machine · October 11, 2009

I sent Frank STI a pm about his box, would his be the longer or shorter ratios.....its a 53 plate??
Cheers

Jase

I think I'm right in saying that all the 2.0L STIs came with the lower-geared (shorter) 'box.

I wouldn't write it off though - you might prefer it that way.

jimmy_AyrshireScoobs · October 11, 2009

my car is the blobeye mate,2.0 version,gearing is pish tbh!

mystery machine · October 11, 2009

my car is the blobeye mate,2.0 version,gearing is pish tbh!

Aye, the later ones are higher-geared.

green_goblin · October 11, 2009

Aye, the later ones are higher-geared.

At what year does it go to the longer ratio??

Cheers

Jase

6 Speed Box

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