Guibo - Proposed Motormount rule

[chuck baader]

Question about the legality of substitution of the guibo. The stock piece (BMW) connects the drive shaft to the transmission and is made of rubber. The alternate is of aluminum with poly bushings to cushion the forces. Both perform the same function, but would the aluminum piece be legal? Is the guibo a bushing? Thanks for your imput. Chuck

[Greg Amy]

So that's what those things are called...whenever I needed one for the old Formula Ford I'd call the guy and ask for "that rubber coupler piece in the driveshaft..."

Chuck, I'd suggest unless it was offered on a same-spec-line BMW, it's not a compliant part...I'd certainly not consider it a suspension bushing...

[chuck baader]

Greg, all BMWs from the 2002 to current (I think) use the guibo. Spec line has nothing to do with it. Chuck

[Greg Amy]

Spec line has nothing to do with it. Chuck

If none of them use the aluminum version, then I suggest it's not a compliant part in IT.

[JeffYoung]

Legal under the new driveline mount rules in my view, so long as there is some squishy stuff in it.

[Greg Amy]

Legal under the new driveline mount rules in my view, so long as there is some squishy stuff in it.

Have those been approved yet?

[tac911t]

Legal under the new driveline mount rules in my view, so long as there is some squishy stuff in it.

The Guibo is not a mount, it is a driveshaft flex joint. It would be like replacing U-Joints with CV-Joints, or a solid shaft. Reading the Nov Fastrack, it states that the Rubber or other inserts can be replaced with other non-metallic inserts.

The BMW Guilbo that was on the E36 M3 I had (my only experience with guilbo's), was mostly a rubber piece, with metal strips inside for reinforcement. Sounds like the replacement part is mostly aluminum with a little rubber.

Is the intent of the aftermarket motor and transmission mounts is to include the driveshaft or halfshafts?