Let's talk high performance CVs/Axles, What are today's options |
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Let's talk high performance CVs/Axles, What are today's options |
vintage914racer |
Sep 21 2020, 12:37 PM
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#1
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Member Group: Members Posts: 429 Joined: 28-December 03 From: Minneapolis, MN Member No.: 1,473 |
I became the member of the failed CV joint club when the inner joint on my 914-6 vintage racer exploded entering turn-one at Road America. Just to spice things up, the tranny I was running has a welded diff, so the failure sent me into a spin....fortunately I avoided contact damage.
My winter project is to upgrade to a guard LSD and find beefier CVs that can handle the power my car is putting out. I know there are options out there that consist of taking other Porsche CVs and adapting for use. I'm hoping to find an off the shelf option, as my available time to tinker in the garage is limited these days. I see Tarett sells high performance half shafts and I know Renegade does or did at one time. Is there anything else out there that I should know about? |
brant |
Sep 21 2020, 12:42 PM
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#2
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914 Wizard Group: Members Posts: 11,640 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
lots out there.
you can upgrade to 944 joints fairly easily (thread in the classics) that will increase the size to 100mm and the later hubs (911) can bump you to 108mm is your chassis braced on the rear swing arm mounts? these cars without tube bracing on the pivot point... will flex the entire frame and swing arm out due to modern tires. flexing or stretching that CV joint in a corner when you are putting power down... is how I have blown all of my joints. and adding the brace bars into the swing arm mount solved my problem 15 years ago... zero blown CV's since that time. of course really big torque.. a V8 may just be too much for the small joints.. but I don't know how much torque your putting out. |
ClayPerrine |
Sep 21 2020, 01:04 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,520 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
is your chassis braced on the rear swing arm mounts? these cars without tube bracing on the pivot point... will flex the entire frame and swing arm out due to modern tires. Brant, Do you have a link to the braces? I would like to add a set to Igor (the 4.0L car). Clay |
brant |
Sep 21 2020, 01:09 PM
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#4
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914 Wizard Group: Members Posts: 11,640 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains |
is your chassis braced on the rear swing arm mounts? these cars without tube bracing on the pivot point... will flex the entire frame and swing arm out due to modern tires. Brant, Do you have a link to the braces? I would like to add a set to Igor (the 4.0L car). Clay I don't.. sorry I bet CFR sells something similar off the rack I have 2 cars with swing arm braces... but my race shop added them in house and not a pre-fab part. brant |
vintage914racer |
Sep 21 2020, 01:40 PM
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#5
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Member Group: Members Posts: 429 Joined: 28-December 03 From: Minneapolis, MN Member No.: 1,473 |
lots out there. you can upgrade to 944 joints fairly easily (thread in the classics) that will increase the size to 100mm and the later hubs (911) can bump you to 108mm is your chassis braced on the rear swing arm mounts? these cars without tube bracing on the pivot point... will flex the entire frame and swing arm out due to modern tires. flexing or stretching that CV joint in a corner when you are putting power down... is how I have blown all of my joints. and adding the brace bars into the swing arm mount solved my problem 15 years ago... zero blown CV's since that time. of course really big torque.. a V8 may just be too much for the small joints.. but I don't know how much torque your putting out. My car is indeed braced. I have a tangerine kit that was installed a few years ago. It was reinforced again last year when I had a suspected soon ear replaced. |
Mark Henry |
Sep 22 2020, 09:11 AM
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#6
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
My 901/914 trans I have the 108mm CV's, hubs, stubs, and input shafts (early 70's 911) and use Sway Away axles part # 2420.
I used later G50 108mm CV's, cheaper, easier to find, but they don't have the gasket groove. I carefully cleaned the mating surfaces and used a sealant. |
914forme |
Sep 22 2020, 06:34 PM
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#7
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Times a wastin', get wrenchin'! Group: Members Posts: 3,896 Joined: 24-July 04 From: Dayton, Ohio Member No.: 2,388 Region Association: None |
Nice Mark - good call on the G50 parts over the 930 parts.
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Mark Henry |
Sep 22 2020, 06:53 PM
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#8
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
Nice Mark - good call on the G50 parts over the 930 parts. The turbo CV's are quite a bit wider, I don't know if that would cause an issue. The G50 CV's are the same spline but are IIRC only 1-3mm wider. They work perfectly. Money shot, you can't really see anything but the bright red Sway-Away axles look pretty. (IMG:style_emoticons/default/biggrin.gif) (IMG:http://www.914world.com/bbs2/uploads/post-26-1497650959_thumb.jpg) |
sixnotfour |
Sep 24 2020, 09:27 PM
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#9
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914 Wizard Group: Members Posts: 10,436 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains |
The fact you had a welded diff, that alone will lessen the load..as it 100% bind every
slight angle from str. and even str with varing road surfaces... hence the differential.. |
mb911 |
Sep 25 2020, 05:48 AM
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#10
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914 Guru Group: Members Posts: 6,883 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest |
What about the bolt on cv/axle kit from tarret? Seems like a simple solution
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vintage914racer |
Dec 18 2020, 10:00 AM
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#11
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Member Group: Members Posts: 429 Joined: 28-December 03 From: Minneapolis, MN Member No.: 1,473 |
What about the bolt on cv/axle kit from tarret? Seems like a simple solution Good question. I’m curious about this as well. From what I can tell they, and pelican, re-sell the renegade high performance kit. The options mentioned above are all good options, but a ready to go solution from tarett, without having to source new flanges, stub axles, etc, is pretty appealing. |
Gary |
Dec 18 2020, 11:51 AM
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#12
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Senior Member Group: Members Posts: 744 Joined: 12-January 03 From: Mount Airy, MD Member No.: 134 Region Association: MidAtlantic Region |
I'm running a 108mm setup also:
* 1970 - 1973 sportomatic trans flanges. Part number 901-332-209-15. I believe 901-332-209-22 works too. These are coarse - splined and IIRC about 3/8 longer than the manual transmission flanges, making up part of the difference in length between 914 and 911 axles. * 1969 - 1975 911 CV / axle; P/N - 911-332-033-08; 108mm 4 bolt CVs. * early 911 stub axle / wheel hub - sorry I don't have the exact years handy. Saw this combination described on the old listserv many years back posted by someone who raced. Has been working fine with my 3.2 for a few years now. |
914Sixer |
Dec 18 2020, 05:02 PM
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#13
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914 Guru Group: Members Posts: 8,906 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region |
Using 911SC hubs, stubs and 915 coarse spline transmission flange. They are 100 mm 6 bolts. Using 944 CV's with sway away full floating axles. Plenty of axle choices over in the Classic Section.
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