Busa/VW091 Adapter Testing Results

[fabr]

Hmmmm,I would have thought someone would ask why he suggested titanium.

[Carlriddle]

I'm gonna say between the torque and the RPM the small inner circle that holds the spider together gave way.  Allowing each individual part to slide its way towards outside ending up like a pile of eraser shavings, which prob didn't take too long.  A tougher material +, easing edges +, little more material in center to hold together +. 

I didn't finish engineering school, but I did stay in a Holiday Inn on way to LS. 

[fabr]

I'm gonna say between the torque and the RPM the small inner circle that holds the spider together gave way.  Allowing each individual part to slide its way towards outside ending up like a pile of eraser shavings, which prob didn't take too long.  A tougher material +, easing edges +, little more material in center to hold together +. 

I didn't finish engineering school, but I did stay in a Holiday Inn on way to LS. 

PRICELESS!!!!!!!! I did too! 

[Hammerworks]

Polar moment of inertia will be lower.

[Reidy02]

I learn so much from this site.  Before today I had always thought this was a "Guido Coupling." 

Go figure.....

Holy crap the things you see when you don't have a gun!!

[fabr]

That's guibo, not guido. And you guys wonder why I bitch about correct spelling. Oh wait! It's really supposed to be spelled giubo and pronounced as "joo bow". Pretty interesting info about how guibo became the accepted but incorrect spelling and pronunciation for a flex coupling. 

[fabr]

Check out this giubo. 

[Lance-W]

Are you suggesting that you use this type?
The diameter of the 3 driven pins on that with the package size constraint you're working with is going to be a problem.  If you "fit" that concept into the area you're working with the pins are only going to be about .375 dia?    Not enough for the load you're trying to put thru it.  You could fit a paddle shape like is on the Busa motorcycle alot easier but I still doubt it would carry the load considering the reduced diameter you're trying to fit it into.

I think Carl has a good thought with the wimpy little ring in the middle on your current part failing and then the pads floating around and getting squished out into the grinder

[fabr]

Are you suggesting that you use this type?
The diameter of the 3 driven pins on that with the package size constraint you're working with is going to be a problem.  If you "fit" that concept into the area you're working with the pins are only going to be about .375 dia?    Not enough for the load you're trying to put thru it.  You could fit a paddle shape like is on the Busa motorcycle alot easier but I still doubt it would carry the load considering the reduced diameter you're trying to fit it into.

I think Carl has a good thought with the wimpy little ring in the middle on your current part failing and then the pads floating around and getting squished out into the grinder

Not suggesting anything but that revshift giubo is the performance upgrade to the 3 series BMW one suggested by BDKW1.  Uses 10MM pins. Must work fine as the pins are not reported by the bimmer world to have any issues at all  .The stock giubo does have issues with the rubber going bad as all rubber will eventually.Consider what really drives a u-joint. 2 little nubs in a small diameter package can handle upwards of 2000 HP in a drag car.

I agree.

[Lance-W]

U-joints...... Two little nibs that are loaded in almost perfect shear and fully supported by the bearing surrounding them.  The problem with this is the flexible coupling allows the pins to be in bending unlike the u-joint.

Basically I'm just comparing the factory Giubo on the Busa with the envelope you have to work in.  The diameter is the key.

[LiveWire]

Fabr's coupler is before the final gear reduction. The one in the Busa is in the rear wheel, right? So after the final gearing.

[fabr]

U-joints...... Two little nibs that are loaded in almost perfect shear and fully supported by the bearing surrounding them.  The problem with this is the flexible coupling allows the pins to be in bending unlike the u-joint.

Basically I'm just comparing the factory Giubo on the Busa with the envelope you have to work in.  The diameter is the key.

There is no giubo on a busa. A cushion drive,yes, but not a giubo.

[Yummi]

There is no gudio on a busa. A cushion drive,yes, but not a guido.

I think there can be a Gudio on a busa......

[fabr]

THAT would be a guido. Still no giubo.

[fabr]

Polar moment of inertia will be lower.

Damn if I know. LOL!!! His reasoning was that titanium was a shock absorbing material in itself . Sort of like why titanium is used for things like golf clubs. I countered with it would be abrasive on the hardened steel jaws. His answer was "hmmmmm.........".