Synthetic Elastomer vs Poly bushings - Mustang Evolution

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Old 01-06-2015, 09:49 PM   #1
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Synthetic Elastomer vs Poly bushings

So I'm in the market for an upper control arm, my first choice was the Whiteline unit here:

Whiteline Mustang Adjustable Rear Upper Control Arm KTA141A (05-14 All) - Free Shipping - AmericanMuscle

But then I saw the bushing is "Synthetic Elastomer" , basically synthetic rubber. Whereas the rest of my stuff is BMR with the polyurethane bushings.

Upon reading up on the differences, I ran across this response from Whiteline about the very question, with some interesting points but this being a Whiteline rep I take it with a grain of salt, any thoughts?:

to answer the original question we originally designed a bushing compound to replace the brass bushings on hill climb vehicles. Over the years our business became centered more around general replacement thus our compound needed to change to minimize NVH associated with Polyurethane. In fact we also make many automotive and non-automotive polyurethane goods - our Polyurethane plant is one of the largest in the world.

Our principal formulation has evolved to what we now refer to as Synthetic Elastomer. It is a long chained polymer very similar to Poly but evolved to hold more desired characteristics such as higher tensile strength, elasticity, and memory.

It is for these reasons we have engineered features to minimize NVH such as scalloped designs, voiding, pin-holing and of course pocket knurling to maximize grease retention. In general we look at how an arm moves, how it articulates under various loads, the reason for the articulation and how it effects other components in the Suspension chain - then we design the bushings to allow or restrict those movements to optimize the suspension travel.

Just think about this..... the Mustang has progressed since the 60's to weigh more, go faster, more torque, more suspension demands and more mileage.... yet wheels have gotten larger since the 60's thus lowering tire wall size... if the car has progressed that much shouldn't you expect your bushings to evolve as well? Its a critical item to link between your tires and your steering inputs.

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Old 01-07-2015, 08:40 AM   #2
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Whiteline's bushings are pretty remarkable, and several people run them with good results. If you're not doing hardcore drag racing, then a SUPER stiff UCA really isnt "that" important. In that case, even if the Whiteline was slightly softer than comparable brands, i would take it for the potential in reduced NVH.

My last car had super stiff motor mounts all the way around, a hard clutch, basically the "racecar" package ... never again haha.

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Old 01-07-2015, 08:51 AM   #3
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I have the whiteline panhard bar as one of the first suspension modifications done to my car maybe 4-5 months into owning it. I have also pulled the bar off twice and no problems or squeaks with it in the 3 years i have had it. Make sure to use a good grease with whatever bushings you decide to get. Energy suspension white grease works well on polyurethane and i think on the whiteline bushings. Whiteline should give you grease with the lca as my panhard bar came with grease from whiteline. You might regret getting an UCA unless you are full out all into drag racing. I have Steeda LCA with relocation brackets and Steeda adjustable UCA with the Steeda UCA bracket. I also have my car lowered almost 3 inches in the rear and have stiff motor mounts and with the Steeda UCA i get a clunk almost feels like a tug in the rear end when the car downshifts. The only side effect of a polyurethane UCA but i also have stiff motor mounts and a lower mustang then most so that might contribute to the clunk during downshift.
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AirRaid CAI, BBK Ceramic LT Headers, BBK Catted X Pipe, Borla ATAK, MPT 93/97 Tune, Steeda LCA's and UCA, Steeda Relocation Brackets, 373 gears, WaveTrac LSD, Dynotech Driveshaft. Prothane Motor Mounts, Whiteline adjustable panhard bar & brace.Ground Control Coilovers with Koni's custom valved. Coming soon Circle D 3800 Stall and Lone Wolf Intake Manifold.
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