Inner CV Joint design - why not Tripod? - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

rice_classic · 07-02-2021, 04:37 PM

I raced Hondas for a dozen or so years and most I've worked on the inner CV joint used a Tripod design which effectively never failed.

Considering how little work the rear axles on our cars do vs a FWD car - I was blown away to find out that our inner joints used a Rrzeppa joint.

For reference
https://www.kmpdrivetrain.com/drives...-rzeppa-joint/

Quote:

Originally Posted by fromKMP

Race cars
For race cars, there are other benefits to the tripod joint. The tripod joint is more compact than the Rzeppa joint. The result is that a tripod joint of the same size as a Rzeppa joint is stronger or a tripod joint with the same strength as the Rzeppa joint is smaller and lighter. Sometimes, when space is at a premium, switching to a tripod joint means a stronger driveshaft can be made without using more space.

Does anyone know if any shops, tuner or individual has gone down the road of converting the inner joint to a Tripod?

ka-t_240 · 07-02-2021, 04:54 PM

I have never taken them apart, or done failure analysis on them, but I have helped change more axles on FWD Hondas at the track than I can count. Is that not where they fail?

Ultramaroon · 07-02-2021, 05:13 PM

I've considered it for a custom solution but my inners are tight. All the lash is in the outer joints.

Bone stock suspension. They're perfectly ok, just annoyingly sloppy.

rice_classic · 07-02-2021, 06:20 PM

Quote:

Originally Posted by ka-t_240

I have never taken them apart, or done failure analysis on them, but I have helped change more axles on FWD Hondas at the track than I can count. Is that not where they fail?

FWD failures are generally the outboard joint.

rice_classic · 07-03-2021, 01:47 AM

I suppose I could just call DSS and see if this is something they have input on.

Capt Spaulding · 07-10-2021, 01:08 PM

I'd be interested in hearing what DSS has to say.

07-02-2021, 05:13 PM	#3
Ultramaroon not playing cards Join Date: Sep 2014 Drives: a 13 e8h frs Location: vantucky, wa Posts: 32,396 Thanks: 53,053 Thanked 37,225 Times in 19,308 Posts Mentioned: 1117 Post(s) Tagged: 9 Thread(s)	I've considered it for a custom solution but my inners are tight. All the lash is in the outer joints. Bone stock suspension. They're perfectly ok, just annoyingly sloppy. __________________ service manuals

07-03-2021, 01:47 AM	#5
rice_classic Senior Member Join Date: Jun 2012 Drives: Nevermorange FRS Location: Seattle, WA Posts: 4,171 Thanks: 757 Thanked 4,206 Times in 1,807 Posts Mentioned: 78 Post(s) Tagged: 1 Thread(s)	I suppose I could just call DSS and see if this is something they have input on. __________________ SCCA T4 - FRS

07-10-2021, 01:08 PM	#6
Capt Spaulding Persona Non Grata Join Date: Nov 2015 Drives: '15 BRZ (WRB) Location: On the Border Posts: 1,882 Thanks: 2,016 Thanked 2,782 Times in 1,201 Posts Mentioned: 10 Post(s) Tagged: 1 Thread(s)	I'd be interested in hearing what DSS has to say. __________________ Slow is smooth, and smooth is fast

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07-02-2021, 04:54 PM	#2
ka-t_240 Senior Member Join Date: May 2014 Drives: BRZ Location: Fargo, ND Posts: 973 Thanks: 124 Thanked 328 Times in 237 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I have never taken them apart, or done failure analysis on them, but I have helped change more axles on FWD Hondas at the track than I can count. Is that not where they fail?

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