6 speed
hi there, could anyone tell me how much power and torqe the sti 6 speed can take? my car currentley has 360 bhp and 375 torque and i'm on my 3rd gearbox!
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Six speeds should take around 450 500 all day long providing you changer gear properly rather than cracking it into gear all the time.
I went through 2 five speeds in 3 weeks on my classic. I swapped to a six speed and havent had a problem since. Daz |
6 speed
cool, thanks for that,i'm planning on a new turbo which should take it over 400 bhp so i'll order a 6 speed.cheapest i've found is £2000+vat from grade a is that a good price? it comes with everything that's needed to fit to a classic.
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try APi they will be cheaper :)
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The works race car has 600 odd BHP, fistfulls of torque and it's been flatshifted all season... not broken yet. :eek2:
(standard spec-c box) Andy |
When putting a 6 speed in a Classic do you have to put 6 Speed STI Clutch and Flywheel in?
I know you need: The box Gear Linkage Prop shaft Is that it?? (assuming diff ratios are the same) |
Change the clutch ? Not unless you want to, the 5 speed set up will work fine. Ditto the speedo and so-on.
David APi |
Originally Posted by APIDavid
(Post 6650969)
Change the clutch ? Not unless you want to, the 5 speed set up will work fine. Ditto the speedo and so-on.
David APi |
If you want a good gearbox read this:
https://www.scoobynet.com/drivetrain...onversion.html I may be selling. |
dont forget the extra weight a six speed will place on the car. (lots)
As an alternative PPG gearset, not an awfull lot of difference in price :) |
Originally Posted by cookstar
(Post 6652259)
not an awfull lot of difference in price :)
Fitting shouldn't be to bad coz it's already booked in for a clutch and flywheel at the end of the month. Is the Gearbox number different between a JAP and UK box?? I'm 99% sure it's a uk version, but would like to be 100% when i go to pick it up. |
Yes check the tranny chart for correct gearbox identification
Warning the rear diffs are different ratios Mark A |
Originally Posted by turboDean
(Post 6667250)
There is to the price i just got one for ;) 52 plate STI 6 speed with 39K for less than £1k.
Fitting shouldn't be to bad coz it's already booked in for a clutch and flywheel at the end of the month. Is the Gearbox number different between a JAP and UK box?? I'm 99% sure it's a uk version, but would like to be 100% when i go to pick it up. TY856 W N is UK TY856 W B is JDM They don't interchange. David APi |
Cheers guys, i'm pretty sure it's a UK car from some question's i've asked, but i've asked the guy to confirm the gearbox number.
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Originally Posted by Mark A
(Post 6667377)
Yes check the tranny chart for correct gearbox identification
According to that web site this is how the uk sti 6 speed compares to the uk 5 speed 6 speed - 1st 3.636 2nd 2.375 3rd 1.761 4th 1.346 5th 0.971 6th 0.756 5 speed - 1st 3.454 2nd 1.947 3rd 1.366 4th 0.972 5th 0.738 This means 5th (6sp) is almost the same as my current 4th and the 6th (6sp) is actually a lower than my current 5th, so i will have a lower top speed with a six speed box. Is this correct?? :confused: |
Yes. Assuming your diff ratios remains the same.
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Is the web site accruate though???
It also says the front diff is 3.90 for all 6 speed sti box's (jap/uk/usa) :confused: I thought the 6th gear would be slightly longer ratio than my current 5th. |
The JDM ratios seem to be more popular for 6 speed conversions IIRC
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Don't forget that the 6 speed cars run on 17 " wheels whereas the Classic is designed around 16" wheels. That is where the longer 6th gear comes from.
ALL 6 speeds use the 3.9 front drive ratio at the moment,JDM or UK/Euro type The difference is the drop gear set up, asthe UK/Euro uses 3.545 rear ratio which is deliberately stepped down by the drop gears to reduce propshaft speed and the NVH [ noise Vibration & harshness ] that comes with fast rotating parts. David APi |
Originally Posted by APIDavid
(Post 6672634)
Don't forget that the 6 speed cars run on 17 " wheels whereas the Classic is designed around 16" wheels. That is where the longer 6th gear comes from.
ALL 6 speeds use the 3.9 front drive ratio at the moment,JDM or UK/Euro type The difference is the drop gear set up, asthe UK/Euro uses 3.545 rear ratio which is deliberately stepped down by the drop gears to reduce propshaft speed and the NVH [ noise Vibration & harshness ] that comes with fast rotating parts. David APi Any idea how much the difference the difference in rpm would be?? |
Based on 225/35/18 tyres the top speed of a uk 6 speed box in 6th would be 171mph @7000rpm
Based on 235/35/18 tyres the top speed of a uk 6 speed box in 6th would be 173mph @7000rpm Based on 225/35/18 tyres the top speed of a uk 5 speed box in 5th would be 175mph @7000rpm So not really much difference worth worrying about. |
Originally Posted by P20SPD
(Post 6674489)
Based on 225/35/18 tyres the top speed of a uk 6 speed box in 6th would be 171mph @7000rpm
Based on 235/35/18 tyres the top speed of a uk 6 speed box in 6th would be 173mph @7000rpm Based on 225/35/18 tyres the top speed of a uk 5 speed box in 5th would be 175mph @7000rpm So not really much difference worth worrying about. I'm currently running 215/35 but will be running 225/35 on my next set of tyres. |
Originally Posted by Fuzz
(Post 6621784)
The works race car has 600 odd BHP, fistfulls of torque and it's been flatshifted all season... not broken yet. :eek2:
(standard spec-c box) Andy |
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