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Old 01-10-2005, 12:05 AM   #1
s4floorin
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Default help adapting awd drivetrain into porsche 911...help!

I need some help putting together this project of mine. right now it is an idea, but i need more info to continue.
I would like to install a wrx drivetrain into a porsche. How would the drivetrain need to be situated? meaning would the gearbox need to be flipped over to work right? since the porsche is rear engine the car would need to drive in "reverse"...
what will i need to do here?

Also since the porsche doesnt have a front differential, i will need to adapt some of the wrx suspension parts to drive the front wheels. both are strut suspensions so it should work.

Please let me know any tips or ideas you guys may have. first timer on the boards, and need all the subie help i can get. maybe certain parts/years i should/shouldnt use?

thanks.
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Old 01-10-2005, 12:07 AM   #2
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Sombody in the SE forun has done this...search on "Porscharu"
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Old 01-10-2005, 12:20 AM   #3
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You're gonna get slapped for cross posting....
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Old 01-10-2005, 01:50 AM   #4
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Wow, just thinking about the fabrication required is mindboggling. I guess the only advice I could give would be to have a machine shop in your garage, or close by. Lot's of things will have to be made. Good luck.
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Old 01-10-2005, 02:54 AM   #5
Boxologist
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why not buy a 4S?
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Old 01-10-2005, 03:01 AM   #6
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Quote:
Originally Posted by billzebub
Sombody in the SE forun has done this...search on "Porscharu"
Yes. User steve_d. PM him for details. The original is a '68 912 with an EJ18 motor in it, and he's working on an EJ20 (turbo) powered '72 widebody 911 right now.
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Old 01-11-2005, 07:41 AM   #7
9-2xs
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problem #1 Porsche equals dry-sump air/oil cooled... I'm not sure where you fit the radiator, turbo, exhaust manifold, Up-pipe, and then there's the tranny, etc.... It looks like a lot of fabrication. And you can get a 911 Nat Aspr 3.0 or 3.2 stage 2 that's rock solid with the early 70's style exhaust that will produce 245hp... And it will be cheaper than all the fabrication... We usually get 120k miles + between rebuilds. Also look closely at the torque/hp curve... My Porsche pulls harder than my stage 3 WRX in 3rd 4th and 5th
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Old 01-11-2005, 08:09 AM   #8
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This begs the question of why?
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Old 01-11-2005, 08:57 AM   #9
joey1313
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I would like to see this when its done.
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Old 01-11-2005, 06:51 PM   #10
911renegade
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what year is this 911?

what are you planning on doing with this car?

to get a driveline from the transmission to the front of the car you will have to cut a tunnel in floor, porsche did not provide a "hump" for a driveline.

hopefully you know how serious it is to cut up the floor of a unibody car.
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Old 01-12-2005, 10:19 AM   #11
Jon Bogert
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Quote:
And you can get a 911 Nat Aspr 3.0 or 3.2 stage 2 that's rock solid with the early 70's style exhaust that will produce 245hp... And it will be cheaper than all the fabrication...
Simpler? Certainly. Cheaper? No way. The whole point of a WRX engine is that it costs 20% of a decent 3.0 or 3.2, nevermind another $800 for SSIs or whatever "Stage 2" means. And if you want 245hp out of a 3.0, you're talking cams, pistons and EFI (> $10k altogether) vs a $500 ECU reflash on the WRX motor.
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Old 01-12-2005, 11:49 AM   #12
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the WRX drivetrain would be a no go with the traditional porsche engine location...all of the drivetrain would be backwards...
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Old 01-12-2005, 01:56 PM   #13
Jon Bogert
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I don't think anyone was suggesting that he could use the Subaru AWD drivetrain. No chance of that. Perhaps read too many of those "flipping the ring gear" stories in kit car magazines?
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Old 01-13-2005, 02:59 AM   #14
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Quote:
Originally Posted by Boxologist
why not buy a 4S?
1234
lets be a post whore
yeah Box!
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Old 01-17-2005, 09:21 PM   #15
brandon
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Quote:
Originally Posted by Jon Bogert
I don't think anyone was suggesting that he could use the Subaru AWD drivetrain. No chance of that. Perhaps read too many of those "flipping the ring gear" stories in kit car magazines?
Now I'll admit I haven't had a Subaru tranny apart before, but could you please explain why you couldn't just flip the ring gear assembly? Is there something in the way? I'm sure there was someone on one of the Australian sites who did this for a rail a few years ago. I'm not saying you're wrong, I'd just really like to know why.
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Old 01-26-2005, 11:14 AM   #16
bryan_johnson
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Default motor spins the wrong way

The 911, 914, VW busses, and bugs have transaxles that spin backwards from normal front engine setups. Normally when people put non-standard motors in a VW or porsche they use the VW/porsche transaxle. KEP makes adapters for alot of these setups. www.kennedyeng.com

Another common conversion is the Corvair motor into old air-cooled VW busses. The corvair motor turned backwards from normal motors, so in that case, as I understand it, they turn the motor around and have some kind of adapter that lets you put the bell housing on the end of the motor that normally has the belts.

/Bryan
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Old 01-26-2005, 06:37 PM   #17
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A Subaru motor spins the correct way to mate to a Porsche transaxle. There are several companies who make Subaru -> Porsche transmission adapter kits that involve mating a Porsche style flywheel and bellhousing to the Subaru crank. This is what was done in the Porscharu v.1.

See below:







If you search in this forum there are several shots of the engine crossmember that Steve fabricated.
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