333pg333

So the question beggars, if we upgrade CV's and axles is there a possible downside? Can that then transfer too much stress back to the diff which is more expensive and time consuming to replace?

PorscheLars

i don't think the diff is constructed for CVJ to break before the diff does.

If a CVJ hook up and explode, the diff will also have enormous peak torque to handle caused this situation.

A diff dont last longer because you have a beter CVJ who dont vibrate and wear out as quick as lower quality CVJ.

The flex in the drive line as axsels (betveen CVJ's), springs in the lamell plate and the flex in the long transaxle saves the diff and the gearbox. Some gearboxes is also neckdowned to flex more and and absorb more peak torq.

Back to the CV Joint's, I have send email to GKN and to a Swedisch company about high torque CVJ.
hope for some good answers.

Is pre-87 driveaxels shorter than -87on. and the splines 33 vs someting else? (I could check home in the manual, but anyone who knows.)

333pg333

It may also be possible to use a 928 CV or one off a different car. I am doing a little digging at the moment...

Cory9584

what about having custom ones made? http://www.driveshaftshop.com/1offaxles.ivnu

Tms951

Right now I am running LoBro axles. They were put together for me by Marty @ raxles.com. They use the HD LoBro cromoly CVs and because my car was built for road race I went with rifle drilled shafts. Each axle is about 3lbs lighter than stock. Today they held up at the dragstrip, but still they are not a drag specific axle. hey are defantly stronger than stock though.

95ONE

What did they cost you TMS? DO you mean the Cage was Chromoly? It seems this is the only true weak link in there. If there were some super strength cage, that seems it should fix the problem. OUt there? Your guy have them? SOurce?

I too was thinking that maybe we can take a 911 Turbo Set. Swap out CV's (held by simple retaining ring.) and there you go. But.. I'm only Guessing these have the same Diameter CV"S and bolt patterns? 928/911? Anyone know?

blown 944

TMS I would be very interested in this and also how you like the quaife carrier? I have a line on a Thorsen (sp) carrier, ever here of them, it looks like a quaife design?

CMF

I am running bmw m5 axles. They are 100mm (porsche original 90mm). You need to change gearbox flanges. (audi 100 flanges are 100mm and bolton)

Tms951

They are similar to the ends some one linked to on Pegasus Racing. here is a quote from there "Heavy-Duty version with a higher torque rating than standard. Heavy-duty version now comes honed for smoother operation with inner and outer race machined from 8620 steel, and a billet cage of 4340." The diffeence between these and the ones I have is that mine have heat sink fins machined in them.

A stock shaft would not fit and a bigger one was needed. I chose the rifle drilled to save some weight because I mostly use my car as a track car. I was told a solid axle could be sourced for les money.

I far as what they cost I don't know, I get discounts on stuff because I work at a shop that sells Raxles axles. Even at what I paid they were expensive. If you don't get the rifle drilled shaft they should be much cheaper.

My sugestion is to call raxles and talk to marty, he will build you something that will fit your needs and as best he can your budget.

blown 944

What year is your 951 and what year M5?

Something will come of this thread I'm sure of it

95ONE

ok... Very interesting... But what about the "Flange" at the wheel/hub?

Are these the same length?

95ONE

CMF ????? Hoping for an answer...

Also. TMS951 noticed that we both broke CV caged on the Driver side.

Has anyone else who has broken a CV Cage on WHICH SIDE it has broken? TMS is thinking that maybe Transmission movement might have something to do with this.

333pg333

So if we run bigger/stronger CV's and axles, what is the chance of pressure damaging the crown wheel and pinion or some other more expensive part?

David Floyd

Drivers side for me also.

95ONE

Sweet. I think we might be on to something here. If maybe a few can confirm this side... we might have some solid evidence that it might not be JUST the cages. Maybe there's a different fix here.