Ok I understand..... I was thinking straight 2 part epoxy. Yeah urethane makes much more sense. I just looked it up and the durometer is clearly listed.

I have to stay away from that site, otherwise I'll be making all kinds of crap. The gears are turning.....


-Rob

 

I'd be worried about those, it looks like it gives it an 1/8 of free play then hits? Hard to tell from the pics but if that's the case its going to cause a pretty solid impact when they do hit.

 

FWIW solid works pretty well on our car. I'm running the hardest level of urethane.

 

I'm curious what these actually act upon in the stock bushings? Do they actually nestle up against the outer metal sleeves?

 

Looks like they ride against the small ring of rubber inside the mount ring.

 

Yeah that is correct. There is a little gap but once that is taken up the aluminum collar will make contact with the outer edge of the rubber busing making it more or less solid. The idea is to allow a minimal amount of compliance. I haven't even driven the car yet but I'm doing some autocross this weekend (on 275 BFG R1s) so I'll get a really good idea on how well they work when I launch.



-Rob

 

I hate the way the stock diff bushings and mounts felt.

when i let out the clutch i want the car to move, i dont want to have to wait for everything to clunk into place THEN start moving.

Same goes for when i hit the next gear, i hate feeling the rubber mess unload then clunk back under load.

 

i was going to comment about urethane mounts as ive been doing that with just about every mount in every car ive ever owned.

why not fill the gaps atleast before putting the collars on?

 

agreed . and a very nice piece too

 

Hey guys,


I did a little testing on these diff collars and I have to tell you that I'm actuality very happy with the mod.

First thing I noticed was when I was jacking up the car. There was virtually zero deflection in the bushings with the new collars on.

I really did not know what to expect from the diff collars as I had never thought that OEM bushings were a big problem. In fact, I thought that it might be rather difficult to quantify the difference with them installed. I could not have been more wrong! The difference with the diff collars was immediately noticeable through every application of the throttle. Initial delivery of torque was improved substantially and every throttle adjustment was delivered almost instantaneous to the rear wheels with a very direct feeling whether it was on, off, or part throttle modulation. Up shifts and down shifts are noticeably firmer with a more direct feel for the road surface by suppressing the wasted motion in the OEM bushings. Heel and toe down shifts also become much more sensitive to the rev match / wheel contact to the road surface. During wheel slip, again the feedback through the chassis is significantly improved.

I would classify them as more of a driver feedback tool than a performance modification.

These diff collars are supposed to allow for a minimal amount of deflection, and looking at the design there should be a tiny amount. However, I do not feel any, despite knowing that there has to be a minimal amount. My personal feeling is that this minimal amount is absorbing unwanted vibrations that perhaps a solid diff mount would produce.


The diff collars improved feedback so much that now I'm really sensing just how much wasted motion and feedback is lost in the OEM tranny and motor mounts. Stiffer tranny and motor mounts just quickly rose to the top of my mod list!


This is my personal opinion, and since I've never had anything other than unmodified OEM bushings on the car, I might be the best one to I've them the thumb up, however I am very happy with the mod.






-Rob