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What kind of power can the standard gearbox and diff's handle
Was just interested to find out which gearbox and diff's you blokes running mega 400+ BHP are using and what can the standard unit handle before it throws it's guts out. I know this has prob been covered before but I tried searching and drew a blank
Craig |
In a classic most people opt for a newage STi 6 speed box and matching diff, but some like myself use the standard casing with PPG internals.
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And some of just keeping chucking 5 speeds at em, which if I'm honest is a waste of money. My RA has broke 5th gear 3 times now running anywhere between 300 and 330 ftlbs of torque. No drag strip starts, no clutch dropping etc.
In 5 years I have spent just short of 500 quid on 2 RA boxes, and another 1100 quid on an sti ra box, dccd pro controller and having my front diff fitted. Thats does not include fitting which I do myself. I could have gone 6 speed for a few more quid. If you want to run over 300 I would go ppg or 6 as said above. |
A very wise bloke said an STi 5/6 box could take upto 400bhp
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Yeah I think the later ones had a wider 2,3 and 4th?
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I ran a V5 RA box on the strip at between 410-451bhp for 6 months with over 30 full launches and never killed it... some just seam to take the power and others dont
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The casing on the TY754 gearboxes was alot stronger.
Its not the BHP that kills a gearbox, its the Torque that kills them. |
Originally Posted by Marx Mcrae
(Post 9310672)
The casing on the TY754 gearboxes was alot stronger.
Its not the BHP that kills a gearbox, its the Torque that kills them. Horsepower = Torque x rpm / 5252 An engine running at 5252 rpm, its torque and BHP are the same thats where the lines on yer graphs cross or the dyno is stuffed. Not trying to be a smart ass just I studied this stuff :) Craig |
Originally Posted by Marx Mcrae
(Post 9310663)
A very wise bloke said an STi 5/6 box could take upto 400bhp
Craig |
Originally Posted by intergrale4x4
(Post 9310728)
So how often do these come up and how much will I need to pay for a good one mate ??
Craig |
anything over 350 on a 5 speed and its pure luck if it survives or not. there doesn;t seem to be a point at which they all fail, well except stupid power anyway. once you hit 350 it prob wont last unless your luck
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Originally Posted by Marx Mcrae
(Post 9310740)
I sold a V6 gearbox with matching diff for £450 last month, but you can usually get them cheaper
Craig |
from a MY99/00 classic impreza
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Originally Posted by Marx Mcrae
(Post 9310826)
from a MY99/00 classic impreza
Thanks Craig |
Don't think I'll bother with this gearbox
Subaru impreza wrx sti 6 speed DCCD JDM gear box set on eBay (end time 07-Apr-10 15:03:22 BST) Prob comes in a truck with 200 illegal's that get dole money soon as thay set foot in Dover (Another 2pence on a litre a fuel and 5k on my PAYE) |
i got mine from scoobyclinic, but you do realise its about 3 grand for the gear kit?
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Originally Posted by Tidgy
(Post 9310867)
i got mine from scoobyclinic, but you do realise its about 3 grand for the gear kit?
Craig |
lol, personaly didn;t fancy the ratio changes of a 6 speed, also as far as which is stronger there seems to be no concensus
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6 speed
You can pick up the box, diff shafts ect for about 2,000-2,500 ish However 4,5,6 syncros are the weaker ones so they are worth replacing. I had another part needed to. Its a heavy bugger. A five speed is doable on the driveway...but a six. So by the time you pay for someone to pull the old box in and put the new one in Budget for 3,500ish. That will however take pretty well much all the torque you can throw at it. PPG similar cost to the above ..are stronger than TY754...but can break. The standard boxes, as mentioned, go for a later TY754 as opposed to earlier TY752. As the casing is stronger. A bit hit or miss as to when they will break. 340-350lbs seems to be the max. However I know people blow them running less I know people who have run more through them and they have held. (VN is the code for the UK boxes to match the rear diff - VB for the Jap boxes to match the jap rear diff) these 600ish (tested) from a breakers. Can pick them up for 400ish. Trouble is the histroy on many of them is a touch vague. Hope this helps |
Originally Posted by Tidgy
(Post 9310938)
lol, personaly didn;t fancy the ratio changes of a 6 speed, also as far as which is stronger there seems to be no concensus
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Originally Posted by Steve Whitehorn
(Post 9310977)
6 speed
You can pick up the box, diff shafts ect for about 2,000-2,500 ish However 4,5,6 syncros are the weaker ones so they are worth replacing. I had another part needed to. Its a heavy bugger. A five speed is doable on the driveway...but a six. So by the time you pay for someone to pull the old box in and put the new one in Budget for 3,500ish. That will however take pretty well much all the torque you can throw at it. PPG similar cost to the above ..are stronger than TY754...but can break. The standard boxes, as mentioned, go for a later TY754 as opposed to earlier TY752. As the casing is stronger. A bit hit or miss as to when they will break. 340-350lbs seems to be the max. However I know people blow them running less I know people who have run more through them and they have held. (VN is the code for the UK boxes to match the rear diff - VB for the Jap boxes to match the jap rear diff) these 600ish (tested) from a breakers. Can pick them up for 400ish. Trouble is the histroy on many of them is a touch vague. Hope this helps |
Originally Posted by intergrale4x4
(Post 9310865)
Don't think I'll bother with this gearbox
Subaru impreza wrx sti 6 speed DCCD JDM gear box set on eBay (end time 07-Apr-10 15:03:22 BST) Prob comes in a truck with 200 illegal's that get dole money soon as thay set foot in Dover (Another 2pence on a litre a fuel and 5k on my PAYE) "Harro I be Brucie from Kazicstan and I would be licking your gearbick I will be sending you used notes in a potected bag. You be giving me a big discount if you are able to play with my sister ?? Like big time she loves the big Diks ?? Please answer me soon as my sister needs her box sorted. Yeack shee mash" :) |
Originally Posted by intergrale4x4
(Post 9311158)
Just sent this to the bloke with the advert on ebay posted above ;)
"Harro I be Brucie from Kazicstan and I would be licking your gearbick I will be sending you used notes in a potected bag. You be giving me a big discount if you are able to play with my sister ?? Like big time she loves the big Diks ?? Please answer me soon as my sister needs her box sorted. Yeack shee mash" :) |
Originally Posted by Einstein RA
(Post 9311850)
What if the bloke is a genuine seller and not some scumbag?
with the amount of bull in it if its genuin he's selling it with false info in it. so who cares lol |
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