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Old 28 Mar 2008, 10:04 AM   #1 (permalink)
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Subaru engine and gearbox

I am not a subaru owner but I have a plan of building a kit car and use a subaru engine and gearbox so I need some technical help

I have an opportunity for a 2000 impreza 2.0l turbo engine producing 218bhp
and its gearbox. However, I would like to put a bigger turbo to get power closer to 300bhp

Will the gearbox be able to handle that power and torque?
Can the same gearbox be enhanced to take more power and torque and what is the maximum recommended?

Also, I plan to lock the centre diff to use the front wheel drive section only as the kit is a mid-engined layout so the front drive shafts will drive the rear wheels when the gearbox is set at the back of the car.
Will this have any affect on the diff housing since in the normal car it only takes half the power?

Anyone who can help please reply.
I appreciate your time
Thank you
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Old 28 Mar 2008, 02:14 PM   #2 (permalink)
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You might want to consider upgrading the gearbox to a Type RA gearset
or something aftermarket which is a bit more stout.

Your project sounds really interesting

are you going to blog it or ???

I'd like to see how it goes

Jamie
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Old 28 Mar 2008, 02:48 PM   #3 (permalink)
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Thank you for your reply
So if I change the internal gears it would be enough to take a 300bhp engine.
What about locking the center diff to have just the front wheel drive diff working. Would it cause excessive stress on it.

As for the blog, i'm still in the planning stage and have bought nothing yet. However, if you would like more details on the kit i'm planning to build, visit www.autospeciali.co.uk. The kit car is called the veleno and is a mid-engined supercar.

I hope that i succeed in doing it and I may consider putting my construction development on the web, but it is surely going to be quite some time in the future
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Old 31 Mar 2008, 11:42 PM   #4 (permalink)
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put it in a mark 1 escort hehe
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Old 01 Apr 2008, 07:28 AM   #5 (permalink)
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It is a mid-engined car. The drive shafts have to come out from the sides of the gearbox not from the rear
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Old 01 Apr 2008, 08:56 AM   #6 (permalink)
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my uk 2.0 litre turbo is currently running a little short of 300bhp, and the standard gear box is still alive with over 300ft lbs of torque. the car has been like this for about 16 months, although i've never properly hammered it.
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Old 01 Apr 2008, 05:15 PM   #7 (permalink)
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Hi Brumbrum. Your 2.0 litre turbo is a standard wrx model or an sti version? Sorry to ask but I am aware that there is a wrx turbo and an sti but don't know how to tell the difference.
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Old 01 Apr 2008, 06:07 PM   #8 (permalink)
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it's a MY1999 u.k turbo, so no, it's not a WRX or STI, just the normal turbo model as released in the UK, as standard: 215bhp / 214ft lbs of torque
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Old 01 Apr 2008, 07:41 PM   #9 (permalink)
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Mine is the same, uk turbo with just short of 300 brake and over 103k done on the original box and clutch as well. I have to admit i do give the old girl some stick now and again and she hasnt seriously let me down so far (touch wood).

My main niggle with the gearbox / clutch has been the clutch slave cylinder which sticks now and again so the clutch biteing point moves but its easily sorted by dropping the clutch in neutral and its back to normal. Easily fixed, just havent had the time yet though.
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Old 02 Apr 2008, 07:20 AM   #10 (permalink)
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So you just increased the power from 215hp to just under 300hp and kept the standard gearbox. That is good news. But how do you think I can make the standard gearbox stronger just to be on the safe side

What modifications did you make to increase your engine power

Thanks
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Old 02 Apr 2008, 08:01 AM   #11 (permalink)
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to incease from 215 to 300 it's not just a question of bolting things on to a scooby. with the correct ECU the usual way is to change the exhaust system to one without catalytic convertors for better breatheing, changing air fiter, and to get a safe 300 you will be looking at a bigger turbo then having the ECU custom mapped to run your engine on it's optimum performance. with the original turbo on the late 'classic' shape scooby's most people don't get much more than 270bhp from them. i got lucky and am getting over 290

as for the gear box.............. .dunno m8

i'm sure you can get even more detailed explanations from other members.
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Old 02 Apr 2008, 08:04 AM   #12 (permalink)
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anyways, is it not the engine torque that kills gear boxes?? don't quote me on that though.

what i should also mention here is that at the time i had my car remapped my clutch kept slipping and could not handle the extra power load. which meant getting a new uprated clutch. but my clutch was pretty worn, and this does not happen to most people. but be aware that older scoobys can suffer fron worn cluthches, and they often need replacing in the cars mid life.

Last edited by brumbrum; 02 Apr 2008 at 08:09 AM.
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Old 02 Apr 2008, 08:12 AM   #13 (permalink)
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I suppose it really depends on how far you want to go. If you want serious reliabilty then a later sti 6 speed box would probably be your best best - might work out cheaper in the long run if the power you want is too close to the breaking point of the original box.

Bear in mind the weight of the car will also affect how hard the gearbox is working so a standard box will probably last a lot longer if your car only weighs half as much as a normal impreza. (i think lol)
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Old 02 Apr 2008, 08:22 AM   #14 (permalink)
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this project could get expensive if modifying a normal uk turbo engine, you may be better off getting an sti engine and 6 speed sti box as mentioned above.
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Old 02 Apr 2008, 11:35 AM   #15 (permalink)
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I am looking for a bhp of around 350 to 400. Someone suggested to use RA gearsets as an upgrade but i read that these sets are good for a bhp range of 275 to 350.
I also thought of using an sti 6 speed version which people say is stronger, but i don't know whether it is stronger in standard form or needs upgrades. Anyone knows what are the practical bhp and torque that the sti 6 speed can take and what prices should I be looking at
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