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Mr. Merk's Avatar
 
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rsr 15x11 fitment for 930

I have a friend with a '78 930 and a set of real RSR wheels. Hoping to install them on this car but running into fitment issues using the wider rear turbo suspension.

I know the 15x11 et-27 will fit a 911 with turbo flares

I know they will fit a 930 with 934 flares

I read an old post from Gordon Ledbetter stating he installed RSR rear trailing arms on a '76 turbo to fit RSR wheels.
Quote:
We had a customer who wanted to fit RSR 9 & 11's wheels on his 76 turbo. The wheels stuck out past the fender lip maybe 1 inch or more, I can't remember exactly. We fitted RSR steel trailing arms and the wheels fit and the car aligned. Spring plate location and pick-up point were the same, just the wheel flange position changed. Gordon
Quote:
Chris, the steel arms we put on the turbo were short RSR. I don't think there was a steel turbo trailing arm. Gordon
Can anyone confirm this?


I do not know if the '76 and '78 shared suspension design

What I'm wondering is if an RSR rear control arm will:

A. fit a 930 without cutting/welding in the pivot mounts

B. allow the RSR 11" wheels to fit inside the turbo flares

'74 RSR IROC


I believe these are aluminum turbo and steel RSR arms

https://www.early911sregistry.org/forums/showthread.php?55907-Cast-turbo-rear-arm-transplant&highlight=trailing

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Last edited by Mr. Merk; 09-28-2020 at 08:38 AM..
Old 09-28-2020, 07:26 AM
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Not sure the answer but that’s a lot of coin to drop on a part to make another part fit.
Old 09-28-2020, 08:02 AM
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^Agreed.

You could build custom RSR look wheels with the right offset and width and have thousands of dollars left over for the cost of a pair of RSR steel trailing arms (go check they are absurdly expensive)

I think you would also need to convert to RSR brakes and do a bunch of other custom fab work to run the heavier steel RSR arms. So not worth it unless you are building an RSR tribute/clone etc.

Can we see pics of the wheels?
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Old 09-28-2020, 08:31 AM
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I understand the opinions but looking for technical information in this thread.

I do not have any pictures although I did handle the wheels a couple days ago. Very cool, very light.
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Old 09-28-2020, 08:44 AM
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RSR wheel offsets are for a 911 and as you know will not fit a 930. If you must use RSR wheels on a 930 then 911 trailing arms will also be needed. The RSR trailing arms are a down grade when compared to 930, SC/Carrera trailing arms would be better and less expensive by far.
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Old 09-28-2020, 09:21 AM
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Quote:
Originally Posted by RarlyL8 View Post
RSR wheel offsets are for a 911 and as you know will not fit a 930. If you must use RSR wheels on a 930 then 911 trailing arms will also be needed. The RSR trailing arms are a down grade when compared to 930, SC/Carrera trailing arms would be better and less expensive by far.
I agree however the 911 trailing arms are not a direct swap and require welding in the pivot points after cutting up the torsion tubes.

RSR arms are made on a jig by modifying steel arms. You'd think if they were being manufactured that one could build them to accept the 930 brakes as well.

I believe RSR arms mount to the car same as 930 arms, but position the wheel like a 911 arm. That's what I'm trying to confirm.

I've asked Gordon to weigh and sent an email to TwinSpark as well. Crossing fingers.
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Old 09-28-2020, 09:49 AM
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https://www.augmentwheels.com/

They've done some really involved work for me.

I'm sure they can build you or modify a wheel for the perfect offset
Old 09-28-2020, 10:02 AM
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Harvey Weidman Wheels have made special offset 11 x15 fuchs for 930 cars in the past. He uses 4 8x 15 donors to make them I don't know what he charges for this. AND his home burned down in Oroville last week. So it will be some time before any sense of normalcy returns to his life and business
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Old 09-28-2020, 07:35 PM
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Quote:
Originally Posted by TRE Cup View Post
Harvey Weidman Wheels have made special offset 11 x15 fuchs for 930 cars in the past. He uses 4 8x 15 donors to make them I don't know what he charges for this. AND his home burned down in Oroville last week. So it will be some time before any sense of normalcy returns to his life and business
I think that's the route my friend will take. He was speaking with a friend in SoCal that sent him pictures of a white 930 with Harvey's 11s on it. They'll probably have about an inch less dish but still look amazing with the big tires.

I'd still like to confirm the RSR trailing arm fitment, so anyone in the future looking for the same information can find it here.
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Old 09-29-2020, 04:06 AM
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It’s been a while but short RSR trailing arms are a direct fit to a 930. The wheel flange ends up more inboard than the 930 arm so RSR wheels will fit. I think the caliper mounting is in the rear as well. The steel arm shown above looks like a SWB arm. This all happened while I was at Rothsport in Shirwood Or. we also did a Turbo Look conversion to RSR, with Harvey’s modified wheels, you could hardly tell they weren’t originals. Someone in England is making RSR arms I think, can’t remember who. Gordon
Old 09-29-2020, 07:43 AM
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Quote:
Originally Posted by gled49 View Post
Itís been a while but short RSR trailing arms are a direct fit to a 930. The wheel flange ends up more inboard than the 930 arm so RSR wheels will fit. I think the caliper mounting is in the rear as well. The steel arm shown above looks like a SWB arm. This all happened while I was at Rothsport in Shirwood Or. we also did a Turbo Look conversion to RSR, with Harveyís modified wheels, you could hardly tell they werenít originals. Someone in England is making RSR arms I think, canít remember who. Gordon
Thanks Gordon. I believe you're referring to TwinSpark in England.
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Old 09-29-2020, 09:25 AM
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The 930 arms push the wheel out ~19.8mm) per side over the SC or RSR, the 930 also used 28mm spacers to further move the wheel out for a total of 47.8mm, the 930 fender lip is 50.8mm further out than the SC/Carrera

here's a shot of RSRs and SCs
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Last edited by Bill Verburg; 09-29-2020 at 09:52 AM..
Old 09-29-2020, 09:43 AM
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Quote:
Originally Posted by Bill Verburg View Post

here's a shot of RSRs and SCs
That's RSR and *930*
Old 09-29-2020, 03:29 PM
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Quote:
Originally Posted by Jim2 View Post
That's RSR and *930*
I believe those to be SC

here's 930
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Old 09-29-2020, 03:41 PM
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930 arm going forward is rectangular section, 911 is round section.

930 arm is short and stalky, 911 is long and skinny. Technical huh, lol.

930 bearing carrier is necked down behind the wheel flange, 911 is squared off.

The 930 casting above the CV runs pretty much straight back in line with the spring plate mounting face, the 911 casting above and rear of the CV is scalloped off exposing the CV.

Post 14 looks to be pre 78 930, note caliper cut out is at front of dust shield.
Old 09-29-2020, 04:47 PM
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Bill, I use your reference material regularly. Thank you for years of keeping your info available.

Old 09-29-2020, 04:56 PM
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