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Stock 5 speed transmission

Old 24 September 2018, 07:43 AM
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Rick2017
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Default Stock 5 speed transmission

What are the limits on the 5spd uk2000 box in terms of bhp out of interest and what transmission oil would people recommend for the longevity of the box.

Also I watched a subaru on tv last night break high 7s on a quarter mile called the white bullet.a new world record apprently. And another subaru breaking mid 8s on a std 6 speed transmission no mods to the box
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Old 24 September 2018, 05:29 PM
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i had an old 5 speed running 280. was recommended not much more to be on the safe side. I think its more the torque that kills them
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Old 24 September 2018, 06:12 PM
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i think its torque and hard launches that will destroy a 5 speed. i had a version 6 sti 5 speed in my blobeye wrx making 354bhp and 365ftlbs of torque, i had it for maybe 2 years then upgraded to a 6 speed and sold the box to a mate who used it for a few years with no issues
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Old 24 September 2018, 06:15 PM
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Originally Posted by the shreksta View Post
i think its torque and hard launches that will destroy a 5 speed. i had a version 6 sti 5 speed in my blobeye wrx making 354bhp and 365ftlbs of torque, i had it for maybe 2 years then upgraded to a 6 speed and sold the box to a mate who used it for a few years with no issues
are the ratios different in the 5spd sti compared to the uk2000
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Old 24 September 2018, 06:34 PM
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Originally Posted by the shreksta View Post
i think its torque and hard launches that will destroy a 5 speed. i had a version 6 sti 5 speed in my blobeye wrx making 354bhp and 365ftlbs of torque, i had it for maybe 2 years then upgraded to a 6 speed and sold the box to a mate who used it for a few years with no issues
how did this make the car feel compared to the uk box ? It's the only thing that I don't like coming from imports to my 1st uk car is the super long gearing ,
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Old 24 September 2018, 06:49 PM
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Originally Posted by scooby kid View Post

how did this make the car feel compared to the uk box ? It's the only thing that I don't like coming from imports to my 1st uk car is the super long gearing ,
made a really really fast car is what it did, the ratios were quite short and as the box had been refreshed by api it was rifle bolt precise
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Old 24 September 2018, 06:50 PM
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Originally Posted by Rick2017 View Post
are the ratios different in the 5spd sti compared to the uk2000
i couldnt tell you mate to be fair, it was alot closer ratio than the box that was originally in the car
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Old 24 September 2018, 07:13 PM
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Awesome it's something I'm really thinking of having done with a clutch/flywheel.
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Old 24 September 2018, 07:15 PM
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I'm not that bothered about long gearing I wouldn't mind knowing what these can take . Has anyone ever taken one to it's limits

Last edited by Rick2017; 24 September 2018 at 07:16 PM.
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Old 24 September 2018, 09:41 PM
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Destroyed 4 over probably 15,000 miles @400 bhp and similar torque
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Old 25 September 2018, 07:40 AM
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Originally Posted by johnlogie View Post
Destroyed 4 over probably 15,000 miles @400 bhp and similar torque
I didn't no these could take 400
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Old 25 September 2018, 10:06 AM
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Originally Posted by Rick2017 View Post
I didn't no these could take 400
Eh?
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Old 25 September 2018, 11:15 AM
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Originally Posted by TECHNOPUG View Post
Eh?
didn't no stock 5spds were capable
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Old 25 September 2018, 11:20 AM
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Originally Posted by Rick2017 View Post
I didn't no these could take 400
Originally Posted by Rick2017 View Post
didn't no stock 5spds were capable
"Destroyed 4 over probably 15,000 miles @400 bhp and similar torque"

Does this suggest that they are capable at 400bhp? I guess if you never plan on driving more more than 3000 miles, then yes, they are capable
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Old 25 September 2018, 11:27 AM
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Originally Posted by TECHNOPUG View Post
"Destroyed 4 over probably 15,000 miles @400 bhp and similar torque"

Does this suggest that they are capable at 400bhp? I guess if you never plan on driving more more than 3000 miles, then yes, they are capable
if you drive like miss daisy and donít use full power it would probably last a while. I do occasional track days so the box was getting a bit of abuse. The last straw was at the JGM day at Elvington where the box shat itself by lunchtime. I would not suggest to anyone that 400/400 and a 5 speed box is a good combo. I now have a 6 speed set up
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Old 25 September 2018, 11:27 AM
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Originally Posted by TECHNOPUG View Post
"Destroyed 4 over probably 15,000 miles @400 bhp and similar torque"

Does this suggest that they are capable at 400bhp? I guess if you never plan on driving more more than 3000 miles, then yes, they are capable
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Old 25 September 2018, 11:29 AM
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Originally Posted by johnlogie View Post


if you drive like miss daisy and donít use full power it would probably last a while. I do occasional track days so the box was getting a bit of abuse. The last straw was at the JGM day at Elvington where the box shat itself by lunchtime. I would not suggest to anyone that 400/400 and a 5 speed box is a good combo. I now have a 6 speed set up
couldn't the torque be pulled back abit through mapping to save the box.the price of a 6 spd box is ridiculous
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Old 25 September 2018, 11:33 AM
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Originally Posted by johnlogie View Post


if you drive like miss daisy and donít use full power it would probably last a while. I do occasional track days so the box was getting a bit of abuse. The last straw was at the JGM day at Elvington where the box shat itself by lunchtime. I would not suggest to anyone that 400/400 and a 5 speed box is a good combo. I now have a 6 speed set up
As you say, you can drive around the gearbox limitations but then it makes it rather pointless having a 400/400 engine if you are never able to use all the power.
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Old 25 September 2018, 11:42 AM
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Originally Posted by TECHNOPUG View Post
As you say, you can drive around the gearbox limitations but then it makes it rather pointless having a 400/400 engine if you are never able to use all the power.
mine will never see over 300bhp that's plenty for day to day driving. What transmission oil was you using was it anything special?
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Old 25 September 2018, 11:46 AM
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Originally Posted by Rick2017 View Post
couldn't the torque be pulled back abit through mapping to save the box.the price of a 6 spd box is ridiculous

Sure. But then it's not going to be 400/400. 5 speed boxes are cheap, so if you are able to do the work yourself, you could probably drop in 4 5speeds for the price of a 6-speed conversion. If you are only doing track days then you may consider changing the box once a year as good value. However, the box could let go at any time. The first time you give it full throttle for example. Or it may last a few thousand miles of abuse.

If you have to pay someone else though, the labour costs will soon rack up. If you want 400/400, especially in a road car/daily driver and don't have the means to swap the box yourself, then 6speed is really the only sensible financial option.



Presumably you currently have a UK2000 or similar. Add up the cost of a reliable 400/400 engine plus 6-speed conversion and you may as well just save all that money towards getting an STi with 6-speed. Whilst it can seem attractive to get a cheaper WRX/5speed car and mod it over time, if you want more power than OEM bolts on’s (turbos, injectors etc) can provide; 330/350, then it makes far greater financial sense to buy an STi as a starting point. Law of diminishing returns – power is cheap and easy at first but gets progressively more expensive £/bhp. Especially once you’ve exceeded OEM parts capability and need to buy aftermarket turbos, forge the engine, strengthen drivetrain etc.



What mods/power are you running at the moment?
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Old 25 September 2018, 11:48 AM
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Originally Posted by Rick2017 View Post
mine will never see over 300bhp that's plenty for day to day driving. What transmission oil was you using was it anything special?
Why the talk of the price of 6-speed boxes then?
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Old 25 September 2018, 11:49 AM
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Originally Posted by TECHNOPUG View Post
Why the talk of the price of 6-speed boxes then?
because I wanted to no the limitations of a 5spd box
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Old 25 September 2018, 11:52 AM
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Originally Posted by TECHNOPUG View Post
Sure. But then it's not going to be 400/400. 5 speed boxes are cheap, so if you are able to do the work yourself, you could probably drop in 4 5speeds for the price of a 6-speed conversion. If you are only doing track days then you may consider changing the box once a year as good value. However, the box could let go at any time. The first time you give it full throttle for example. Or it may last a few thousand miles of abuse.

If you have to pay someone else though, the labour costs will soon rack up. If you want 400/400, especially in a road car/daily driver and don't have the means to swap the box yourself, then 6speed is really the only sensible financial option.



Presumably you currently have a UK2000 or similar. Add up the cost of a reliable 400/400 engine plus 6-speed conversion and you may as well just save all that money towards getting an STi with 6-speed. Whilst it can seem attractive to get a cheaper WRX/5speed car and mod it over time, if you want more power than OEM bolts onís (turbos, injectors etc) can provide; 330/350, then it makes far greater financial sense to buy an STi as a starting point. Law of diminishing returns Ė power is cheap and easy at first but gets progressively more expensive £/bhp. Especially once youíve exceeded OEM parts capability and need to buy aftermarket turbos, forge the engine, strengthen drivetrain etc.



What mods/power are you running at the moment?
I'm running about 220ish maybe a bit less. I rescued the car long story and doing it up in stages.just a k&n filter and front mount intercooler set up. I've put in a 255 walbro pump and new plugs and leads. I work for a main dealer as a tech
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Old 25 September 2018, 11:54 AM
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300/300 shouldn't be an issue but you can destroy a box on stock power if you abuse it. A little mechanica sympathy goes a long way.
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Old 25 September 2018, 11:57 AM
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Originally Posted by TECHNOPUG View Post
300/300 shouldn't be an issue but you can destroy a box on stock power if you abuse it. A little mechanica sympathy goes a long way.
that's why I was asking about the boxes. You no like someone who's been there and done type of thing. Gives me an idea of what I can do then. I surpose a good transmission oil would help abit as well
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Old 25 September 2018, 12:33 PM
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I would stick to around 300. I really don’t see the point in spending the money to get the car reliable at much higher power level when you can’t use that power properly on the road anyway.
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Old 25 September 2018, 12:54 PM
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Originally Posted by johnlogie View Post
I would stick to around 300. I really donít see the point in spending the money to get the car reliable at much higher power level when you canít use that power properly on the road anyway.
that's very true .I'm changing rear mains on Saturday and the oil separator along with a stock sti clutch.
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Old 19 November 2018, 02:14 PM
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Originally Posted by johnlogie View Post
I would stick to around 300. I really donít see the point in spending the money to get the car reliable at much higher power level when you canít use that power properly on the road anyway.
For time attack racing (so no hard launches) do you think a GC8 5 speed STI box would still suffice or again is the best option the 6 speed box.... Trying to sort out my budget for the next year. I'll be running close to 400.

Cheers,
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Old 19 November 2018, 06:55 PM
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Originally Posted by Ash Webster View Post
For time attack racing (so no hard launches) do you think a GC8 5 speed STI box would still suffice or again is the best option the 6 speed box.... Trying to sort out my budget for the next year. I'll be running close to 400.

Cheers,
i wouldnít like to say Ash. My first gearbox went at a little over 300bhp on the road (while I was in Ireland ). Another on the road, one at knockhill doing a track day. Up to this point I had never launched the car. The last one went at Elvington where I tried the drag strip for the first time. I had no confidence in the gearbox lasting the day and knew it would go at some point.
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Old 20 November 2018, 11:31 AM
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Originally Posted by johnlogie View Post


i wouldnít like to say Ash. My first gearbox went at a little over 300bhp on the road (while I was in Ireland ). Another on the road, one at knockhill doing a track day. Up to this point I had never launched the car. The last one went at Elvington where I tried the drag strip for the first time. I had no confidence in the gearbox lasting the day and knew it would go at some point.
ouch I'm already running ~330. WIll have to put the new turbo back until after the 6 speed.

thanks for the info
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