My project is underway. Using S2000 engine to my Lotus Super 7.
I've been told one of the weakest point in the S2000 engine is the driveshaft U joint. Don't really know how much power before it breaks.
So, before I put the driveshaft, I would like to beef it up. Is someone out here
selling this adaptor to modify the U-joint ? This adaptor is in replacement of the stock S2000 using a standard but stronger U-joint.
Any information and advice ?

Thanks a lot

 

I've never seen those. Are you going to change it at both ends?

 

I would like to replace the U-joint that goes to the tranny. Since my differential is a Cosworth type, I will use a cosworth coupling at the other end.

You said you never see this one?
Is it true the Joint in the S2000 is very thin and can break anytime?

Thanks

 

This is the first I've heard of this. Who you been listening to? People have 400 to 500 whp going through those things and that's not what breaks. We hear all the time how our diffs are weak, how our CV joints are weak, how our clutches are weak. Who ya gonna listen to?
You're putting all this into a chassis that's much lighter than an S2000, right? I'm not feeling the need to worry over the propshaft CV type joints.

 

 

the driveshaft does not have U joints.

if you replace one driveshaft CV joint with a U joint, you are going to have all kinds of vibration. You will have to replace BOTH CV joints.

also, the driveshaft CV joint is not regarded as overly weak. The diff is (but you can fix that with Comptech).

 

Well, now you heard it!!
Actually two guys one in Oregon and one in England reported about this issue.
Both blew their driveshafts during road racing.




That's why both went to beefed up their joints

Yes! my car weight 990lbs same as the 2 guys who blew their driveshaft.

 

Something else had to have been going on in those cases. When Turboed S2000 are pushing in excess of 400 whp on a 3000 lb. car don't blow propshaft CVs, I find it odd that these guys would.
If you are about to do the same sort of thing with your vehicle, then it's certainly something to be worried about, but that doesn't mean it's common with S2000s.

 

"but that doesn't mean it's common with S2000s. "

Yeah that's why I am asking. If this is not common, puzzles me why blew in a very light car that weigh in just below a thousand.
Maybe...not balance well?

Thanks

 

All sorts of things can contribute to a parts failure when you are dealing with a "put together" car. Who knows what a different differential will do the loads and strain of a CV joint. And what about the type of road circuit it was. Maybe there were turns and curves that put odd loads on those diffs and that transferred to the CV joint.
Like I said, it's like a consideration for what you're trying to do, but it hasn't been one for most unmodified drivelines.