shogun32
Well-Known Member
- Joined
- Feb 8, 2019
- Threads
- 89
- Messages
- 14,682
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- 12,214
- Location
- Northern VA
- First Name
- Matt
- Vehicle(s)
- '19 GT/PP, '23 GB Mach1, '12 Audi S5 (v8+6mt)
- Vehicle Showcase
- 2
The EB/PP got the double-Whiteline full-replacement treatment. Aside from the drive-shaft click/clack it was basically silent. The GT has BMR CB762+Whiteline Diff total replacement and there is an undercurrent of 'road growl' but not remotely like the piercing diff singing you get with the Puck systems. Next spring I might try retrofitting the Whiteline IRS bushings (drop-in kit, not total replacement) and see if I can't banish the noise. The GT has some noise from the MT82 trans because of the Steeda trans (front) insert. The EB I passed on that piece and no discernable increase in trans noise.
The Whiteline stuff costs a fraction of the BMR/Steeda solutions and does a much better job IMO.
Yes there are large ID/OD washers to protect the bushing material from being cut by the narrow lip of the bushing cups. There is some squishing of the material but all of the bolt torque is being absorbed by the bolt, acting on the center hollow shaft. The WL system has some give to it unlike solid 6061/Delrin which allows it to attenuate sound. I wouldn't recommend Delrin as a material because it's not particularly suited to shock loads. That said most of those forces are absorbed by the suspension so unless you're able to drive big twist/bending loads into the sub-frame it's not really a problem. Delrin is just a lot cheaper to source and machine than 6061 and gives you a rigid and dimensionally consistent solution vs something like 85shore Poly.
The Camaro has a similarly defective factory solution (void rubber, but seems a lot stiffer?) and I'll be making my own Whiteline-like solution since there are no offerings except from GM (6061, and dimensioned wrong) or BMR's which are too hard.
The Whiteline stuff costs a fraction of the BMR/Steeda solutions and does a much better job IMO.
Yes there are large ID/OD washers to protect the bushing material from being cut by the narrow lip of the bushing cups. There is some squishing of the material but all of the bolt torque is being absorbed by the bolt, acting on the center hollow shaft. The WL system has some give to it unlike solid 6061/Delrin which allows it to attenuate sound. I wouldn't recommend Delrin as a material because it's not particularly suited to shock loads. That said most of those forces are absorbed by the suspension so unless you're able to drive big twist/bending loads into the sub-frame it's not really a problem. Delrin is just a lot cheaper to source and machine than 6061 and gives you a rigid and dimensionally consistent solution vs something like 85shore Poly.
The Camaro has a similarly defective factory solution (void rubber, but seems a lot stiffer?) and I'll be making my own Whiteline-like solution since there are no offerings except from GM (6061, and dimensioned wrong) or BMR's which are too hard.
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