 Torque limits of stock CV joints |
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| 914e |
 Nov 8 2020, 10:33 AM
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#1
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Member  Group: Members Posts: 496 Joined: 21-February 20 From: Arizona Member No.: 23,951 Region Association: Southwest Region 
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It seems that the limits of the 901 transmission is about 225 pound feet. I have not been able to find much information on the design limits and real limits of the CV joints. At most I see references to them being the weak link. My new motor outputs 175 pound feet of torque. I'm afraid the CV joints will not last long. Should I plan on installing something like tarett 914 axles? They claim a limit of 300 pound feet of torque.
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| 76-914 |
Nov 8 2020, 12:26 PM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,495 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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If the "e" in your handle indicates electric then I'd go with larger CV's. I snapped 3 914 CV's running a V8 (300+ ft lb's) and that wasn't even burning rubber. With a Suby that produces ~250 ft lb's I have no breakage issues. (IMG:style_emoticons/default/beerchug.gif)
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| 914e |
Nov 8 2020, 04:01 PM
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#3
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Member Group: Members Posts: 496 Joined: 21-February 20 From: Arizona Member No.: 23,951 Region Association: Southwest Region
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QUOTE(76-914 @ Nov 8 2020, 11:26 AM)  If the "e" in your handle indicates electric then I'd go with larger CV's. I snapped 3 914 CV's running a V8 (300+ ft lb's) and that wasn't even burning rubber. With a Suby that produces ~250 ft lb's I have no breakage issues. (IMG:style_emoticons/default/beerchug.gif) Yes, it was converted about 20 years ago. I am updating with it a modern AC motor. I know that in our bug the motor made short work of the old worn CV joints and transaxle. It doesn't have anywhere near this power. The new motor has about the same HP as 914-6 GT but with more torque across 5000 rpm. Then the regen on braking which the old DC motor does not have pretty much has the driveline under load all the time. Is there any other axle options besides stock, Tarett, or something completely custom? |
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| 914Sixer |
Nov 8 2020, 04:16 PM
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#4
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914 Guru Group: Members Posts: 8,877 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Blind Chicken Racing, CV101 may be able to help you. Try 930 turbo cv's
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| KELTY360 |
Nov 8 2020, 08:42 PM
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#5
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914 Neferati Group: Members Posts: 5,031 Joined: 31-December 05 From: Pt. Townsend, WA Member No.: 5,344 Region Association: Pacific Northwest
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Give the stock ones a try and see what happens. If they break you would have to upgrade anyway. If not, then you have your answer.
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| IronHillRestorations |
Nov 8 2020, 09:29 PM
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#6
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I. I. R. C. Group: Members Posts: 6,716 Joined: 18-March 03 From: West TN Member No.: 439 Region Association: None
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Brand new ones are pretty strong. If there's any wear high HP wil lunch them quick.
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