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Old 05-12-2009, 07:41 AM   #1
aaron04
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Default RWD win and fail

I had my center diff welded at a local shop with a 220 amp welder.

i used this thread for reference http://www.clubwrx.net/forums/powert...wd-w-pics.html

so for about 50 bucks and the cost of new transmission fluid my car is now full RWD.

you dont have to drop the trans for the install either. just take off the trans mount, drive shaft, pop off the shift linkage with a punch and then take out the back 10ish bolts on the back of the transmission. the center diff will slide out easily along with the transfer gears.

put the welded one back in, and the gears, seal the pieces of the case and put everything back together... DING your RWD.

so a 07 wrx with a dogbox and externally gated fp green with meth makes for lots of fun.
first part broken is the left rear axle. they dont like launching with all the power to the back i guess... lol. so im replacing it with stock for now and saving up for dss stage 5. the cusco r160 lsd will follow soon after.

ill keep updating with what happens to the ongoing carnage of my drivetrain.
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Old 05-12-2009, 09:10 AM   #2
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easy enough to do, but you won't gain any power from doing it, you still are driving all the exact same parts.
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Old 05-12-2009, 09:37 AM   #3
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Quote:
Originally Posted by rkramer View Post
easy enough to do, but you won't gain any power from doing it, you still are driving all the exact same parts.
I don't think that was the point of his post. To me, it seems like he was showing people how cheap and easy it can be to go rwd. Albeit not the most sound way of doing things, no one can argue the cost effectiveness. Also I would bet he did this for the fun factor, not to gain a few ponies, which would indeed be minuscule in the grand scheme of things.
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Old 05-12-2009, 10:08 AM   #4
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Quote:
Originally Posted by aaron04 View Post

first part broken is the left rear axle. they dont like launching with all the power to the back i guess... lol. so im replacing it with stock for now and saving up for dss stage 5. the cusco r160 lsd will follow soon after.

ill keep updating with what happens to the ongoing carnage of my drivetrain.
Sweet! Subscribed...
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Old 05-12-2009, 10:20 AM   #5
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Yeah, I find this interesting too. I like AWD on the track but, RWD is tempting.
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Old 05-12-2009, 10:26 AM   #6
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Yeah, I find this interesting too. I like AWD on the track but, RWD is tempting.
I ran RWD a few years back but found it frustrating. I was only on 235 street tires but the car made too much power. It was nothing but wheel spin. Due to the rear geometry you don't get much squat under acceleration (even with soft springs) so the rear doesn't hook up well at all.

-Duncan
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Old 05-13-2009, 05:48 AM   #7
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it was mainly for fun factor. not for more power. but not having the viscous couple in the center diff should net a small gain. it will be mainly for drifting as soon as the drivetrain and suspension are up to snuff.

think a rear sway will kill my wheel hop. i have cobb springs
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Old 05-13-2009, 08:04 AM   #8
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I ran RWD a few years back but found it frustrating. I was only on 235 street tires but the car made too much power. It was nothing but wheel spin. Due to the rear geometry you don't get much squat under acceleration (even with soft springs) so the rear doesn't hook up well at all.

-Duncan
The squat can be changed though. We have a new product we are testing that would help with this.

Tony
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Old 05-13-2009, 09:32 AM   #9
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Quote:
Originally Posted by aaron04 View Post
think a rear sway will kill my wheel hop. i have cobb springs
How will a SWAY BAR kill your wheel hop?

IIRC the sway is used in the Lateral suspension to reduce the flex (left to right) of the suspension compression / extesion on the sides of the car...

I would tend to thing that a trailing arm with some sort of snubbing would be more for a good lauch and hook-up... Think how a snub bar holds a leaf spring from rippling on a muscle car.

I'm no suspension expert though...
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Old 05-13-2009, 10:33 AM   #10
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TIC, is that the tubular crossmember thingy?
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Old 05-13-2009, 01:32 PM   #11
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Upgrade tranny motor mounts, rear diff bushings, bushings at the sides of the T-brace, and also upgrade your trailing/lateral arms to pillow ball or STIFFER than stock bushings. This will help with the wheel hop and also get ride of the slack in the driveline.
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Old 05-14-2009, 04:49 AM   #12
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Expect your rear crown and pinion to break next, mine did and thats with a R180
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Old 05-23-2009, 04:25 PM   #13
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decided to go with an r180 and dss axles. hopefully that holds up lol
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Old 05-23-2009, 04:28 PM   #14
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subscribed
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Old 05-24-2009, 09:36 PM   #15
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used to have a datsun 510. had a datsun 240z with a built 280z turboed running up to 25 psi on race gas..

the 510 had r160. i took the r180 out of the 240 put it in the 510, bought a r200 from a 280zx or some similar and put that in the 240z. that was what lots of folks were doing at the time. r200 was a bit longer in the back. you had to use a different 'mustache bar' that allowed a slightly longer back on the r200. other than that it was a direct bolt in..

wonder if you could build a mount (or does someone make one) to put a r200 in there..
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Old 05-24-2009, 09:48 PM   #16
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It's been done. The entire crossmember has to be modified and there's no straight axle bolt on.
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Old 08-09-2009, 04:52 PM   #17
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seems to run pretty good. made about 25 passes last night. really really fun. every thing held up great til the ride home when the welds on the center diff let go. guess ill try a better machine shop. lol heres a vid... ran out of steering angle at the end haha

http://www.youtube.com/watch?v=bA9xL...layer_embedded
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Old 08-09-2009, 06:17 PM   #18
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sounds very interesting and fun! what did you do with ur front axles?
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Old 08-09-2009, 07:24 PM   #19
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front axles are still in
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Old 08-10-2009, 07:10 PM   #20
aaron04
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possibly getting a ppg spool diff so i dont have to worry about the trans anymore...

think im gonna go the cheap route and buy some more r160's and maybe a lsd for it. seems like the ring and pinions like to break from other people so ill just keep buying diffs lol and transfering the lsd.

for not many suspension mods the geometry of the suspension is very good. i need more steering angle. and some coilovers to keep the body roll down more than my cobb springs do.

but... i have found the best way to get rid of re092's lol
4 down in 1 night...
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Old 08-11-2009, 04:26 AM   #21
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Yeah I had some thougts on swapping a 1JZ in my GC and using it for drift/wangan. the only issue would be the rearend. they just dont seem to like RWD.
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Old 08-16-2009, 07:16 PM   #22
aaron04
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something bery bery bery baaaad happened lol.

either the diff was not welded perfectly true and balanced or the bearing race was not seated properly.

because it blew the **** up....

the bearing for the center diff assploded
causing the transfer gears to go crazy and munch themselves to oblivion.

but i have spares for both.
so im going to weld my new diff up and make sure this shop does a little better job and put the new gears in. ohh the carnage

it will be ready next week.

picked up a FWD impreza steering rack and ordering coilovers on tuesday.

next event should be nuts!
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Old 08-17-2009, 11:02 AM   #23
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Lol, that's hilarious.

So the FWD impreza rack has a greater throw? That's good to know!

Phil
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Old 08-22-2009, 07:05 PM   #24
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I did this like 4 years ago in my 02 wrx. I fixed the wheel hop with the full poly bushing kit. wheel hop stop right there. I riped the spider gears in like 1 day. so i welded the r-160 and it lasted for like 3 months of hard driving. i finally broke because i was in a drift and the road transfers from asfalt to concret and i didnt get off the gas fast enough. it broke two teeth off the ring gear. i got enother diff and put it back to awd. I did build a tranny to be only rwd. i took the front diff out of it and caped the drive shaft holes. then i got the empi outer cv joints with the tone rings so the brearing would stay together and the abs wouldnt freak out. i got rid of the car before i ever put this rwd trans in but i always wanted to. I even started making a list of rear stright axles to put in the car. but i never got that far. it was fun while it lasted. now i think i and going to get like that custco center diff for my 08 wrx. if they even make it for the 08.
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Old 09-19-2009, 04:40 PM   #25
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well more bad news.... before the event tonight i popped my rear diff...

feels like the r+p we shall see i guess.

not messing with 160's anymore

im gonna step it up to a r180 and get some 04 sti axles for now
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