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Race Car Fabrication There is a lot of cool fabriaction going on the race car industry, show us what you got.


Race Car Fabrication There is a lot of cool fabriaction going on the race car industry, show us what you got.

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  #1  
Old 08-12-2008, 11:08 AM
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Small rear IRS Differential?

I am looking for a small lightweight rear IRS diff/housing.

So far I like the Subaru rear diff, they don't have alot of tabs and crap all over them and they are CHEAP. The S2000 might be a little lighter, but the price for one isn't worth it. I can't find much on the Miata, but it has big "wings" on it.

Does anyone have any other ideas? Quaife has one for 4-5 grand... maybe next year. I will be using an engine with about 200 hp and maybe half that in torque.

Thanks.
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Old 08-12-2008, 11:40 AM
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http://www.1speedway.com/irs_quickchange.htm nice little unit ,sells for around $1500
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Last edited by Dqracer; 08-12-2008 at 11:44 AM.
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Old 08-12-2008, 12:20 PM
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Look at a Jaguar rearend.. I have a few freinds that have picked the up out of Bone yards relativley cheap
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Old 08-12-2008, 12:48 PM
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Jagruards aren't bad, because its a Dana 44 center section. I pay around $250 for a complete axle.

RX7 is another option, and easy to come by, but they look pretty weird.

Supra would be my first choice. You can pick them up for under $500 when you find them. They are harder to find, but doable if you search a few junk yards. They are nice because they are aluminum, have few mounting tabs, and look pretty normal.
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Old 08-12-2008, 01:23 PM
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The 99' up cobra center section maybe an option too.
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Old 08-12-2008, 02:00 PM
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Honda

The Honda CRV SUV has a very small and skinny rear IRS. The first ones it was hanging out there and easy to see as you followed one down the road. They also had large tires so the gearing is likely deeper than a smaller car IRS. I have been wanting to see about one myself. Plus scince the Honda CRV's are usually (if not all) 4x4 there is a front end (also IRS) that could be used if you wanted a 4x4 setup. Bill
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Old 08-12-2008, 05:00 PM
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supra/celica IRS 7.5 inch, cast housing.
mark 3 supra 8 inch, cast housing, alum. rear plate
same with mark 4 supra IIRC.
cressida shared the supra rear end setups with similair model years.
gears and LSDs or lockers are pretty common, and easy to find.
early rav4 is a small unit, might be a 6.7, i'm not sure.
newer ones are electrically controlled viscous units.
all trac turbo celica (more rare) maybe a 6.7 as well? some have a thorsen....
many many to choose from
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Old 08-13-2008, 12:34 AM
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I don't know the exact specs on the RX7 rearend, but looks a lot like a Toyota 3rd member with a long pinion. May be pretty easy to setup and adapt for a small buggy or whatever you're working on.
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Old 08-13-2008, 09:14 AM
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You guys are great. On the other motorcycle based boards all you hear is Baaaaaaa Baaaaaaaa as almost everyone steps the line the flock sets. Overnight, I have more ideas than all the other places combined.

I got started a little last night. The CRV case is great, but a problem it has is that the AWD system has a diff worked into its snout.

That mini quick change is awesome! It costs quite a bit, but I think I could get away with that. It costs about the same as an inline reverse, and I can do with out that for a while.
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Old 08-13-2008, 11:17 AM
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Also look at.

If you see one take a look a the Ford Merkur (The cars look a little like a spaceship. Germans technofunk engineering) They have (I believe) a 8.8 differential that has German CV flanges right on its sides with IRS axles (I cannot remember what the flanges fit but they are large. I dunno if they are 930 large, doubt that but?). The diff IS a little heavy though as its cast iron. But look at it anyways. Its not that wide.

I have heard that the newer Thunderbirds also used a diff like this but it was supposed to be an aluminum case IRS setup. I do not know what it used for axles coming out of the diff but even IF they were not what you wished its supposed to be an 8.8 as well. Perhaps a person could take the parts out of the Merkur cast iron diff to have the German CV flanges and put them in the Thunderbird aluminum case? I want to see if this is possible as I have heard what I stated above and its likely they are. I used to have a Merkur diff laying around but where it is not I am not sure. I would need to find the Aluminum version and take it apart to see if there is a compatability issue but my understanding is the 8.8s parts are swappable in the IRS diffs. But I do need to prove it. Bill
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Old 08-13-2008, 11:32 AM
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Here is the T-bird center chunk.


Also the 99' up cobra's and they where a 31 spline unit. Here is the Cobra set up fabed into a cobra kit car chassis.


Last edited by Tripp; 08-13-2008 at 11:37 AM.
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  #12  
Old 10-15-2008, 11:06 PM
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You can also try a Mitsubishi Starion (dodge conquest) rear.
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Old 10-16-2008, 01:25 AM
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Irs Rear

The S2000 rear is built by Mazda................

The Supra rears are the best.........go to Majestic Motorsports on youtube
and watch 1350 hp white Supra......this car has never broke a rear end yet but has broke about 10 driveshafts until the carbon fiber one in it now was built...no more driveshaft failures....i am still amazed the rear ends hold the power the Supra guys put down. my 2 cents...
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