Delrin vs.Poly

[101charley]

Vendors offer differential and cradle bushings in either Delrin or Polyurethane. What is the difference? Which is better?

Sponsored

 

[Grimace427]

Delrin is very hard, almost solid. Will transmit much more NVH but with greater suspension feedback and performance. Polyurethane is softer than delrin, but stiffer than the OEM rubber bushings. For the street performance car definitely go with poly.

 

[Triple Wile E]

Delrin will have less deflection and more NVH and the Poly will have more deflection and less NVH because of the softer material. Both are good options to eliminate wheel hop it just depends on how NVH sensitive you are. I've got the Delrin cradle bushing and Aluminum diff bushings NVH is increased but its nothing I can't handle.

 

[BMR Tech]

To my knowledge, we are the only company on the planet who offers Delrin Cradle Bushings. And we are definitely the only company who offers multiple Cradle and Diff solutions - so I think I can definitely answer for you. ;)

Cradle to Chassis: Delrin is the clear winner. Aluminum and Delrin perform very similarly. The reason we chose to use Delrin, after originally developing and testing them in Aluminum was A, costing and B, the Delrin promotes less NVH.

Poly - this works very well too, but I am a firm believer that the NVH difference between the Delrin and Poly is so small, and the Delrin performs so much better, that the Poly is a waste of time. (this is my personal opinion - if I am going to spend the time, money and effort to replace my bushings, I want the best)

Cradle Bushing Lockout Kit: This kit is just amazing. People absolutely love it. It is my personal favorite solution. This kit "almost" works as well as the Poly Bushing kit - which is saying alot. This mod is for the person who wants the most cradle re-enforcement possible while retaining OEM-Like NVH levels.

Differential Mounts: Aluminum is the clear winner. Why is Aluminum better than Delrin in this application, yet the Aluminum wasn't as good in the Cradle Application in our opinion? Well, we have been designing, making and offering IRS components for many years now. In the years past, we have seen issues with melting Delrin Diff Mount bushings on IRS set-ups that are pushed extremely hard. You will not melt Billet Aluminum Diff Bushings.

Poly, this is the best overall solution. The Poly works VERY well for reducing pinion movement/deflection...while retaining bearable NVH levels. Some people have a hard time with the NVH levels, but most people can handle it.

Inserts: Excellent solution. They do not perform as well as the real bushings. Steeda offers pretty nice kits in Poly and Aluminum. Our Aluminum versions will be available in a few weeks, and our poly - we have had to redesign several times for reasons I do not want to mention at this time.


Of all that said, if you are just looking for increased performance - with minimal NVH levels, the CB005 Cradle Lockout Kit and BK049 Poly Diff Kit is your best bet. This package is proven, time and time again and works well. It is the best value ont he market. If you want a little less NVH than these offer, then the CB005 Kit + The Steeda Poly Insert Diff Kit is where it's at.

Sponsored