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New Bump Deletes The Bang - Quiet Response Bumpstops

Posted in How To on January 1, 2012 Comment (0)
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Photographers: Jon Acuff

There is no question that hydraulic bumpstops have found their way into consumer’s vehicles. They, like many items first used on race trucks, have made the jump into 4x4s and prerunners—and not just on high-end vehicles. But what is acceptable in a race vehicle is not always acceptable in a daily driver. One such example is the loud clacking sound that often comes from hydraulic bumpstops being engaged during suspension oscillation (read: when you’re hammering your truck).

For some, it’s an acceptable noise that an owner gets used to. For others, the price, the maintenance, and the added noise are reasons to stay with a urethane (or factory style) bumpstop. But the crew at Pure Performance knew there had to be a happy medium.

Enter the Quiet Response (QR) bumps. The QR bumpstops are neither a plain urethane bumpstop nor a hydraulic bumpstop. Instead, they’re made up of closed-cell poly foam rings around an emulsion bumpstop. The nitrogen charge in a QR bump is not what acts as the mechanical spring, and instead it’s the closed-cell poly foam that slows down the suspension compression. The 2.0 body does in fact hold nitrogen and a 1-inch Nitrotec shaft, but it’s more of an emulsion shock design with valving on the end of the shaft. By using shock valving inside the extruded aluminum 2.0 body, the QR bump can slow down more aggressive and faster compression movement, and can also slow down the rebound damping of the bumpstop.

The Quiet Response bumpstop has two closed-cell poly foam rings around the 1-inch Nitrotec shaft. The rings act as the mechanical spring, replacing the use of nitrogen pressure as a spring.

We got our hands on a set of the QR bumps for a project truck that would be able to put a hurt any bumpstop. During initial testing, there was no noticeable sound emitted during bumpstop engagement, and the action was smooth and unnoticed. They definitely have done their job so far, and we’ll have to see how they hold up over the next few months.

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Sources

Pure Performance
Green Island, NY 12183
518-270-9822
http://www.pure-performance.biz/
SMP-Fabworks
Sylmar, CA 91342
(818) 890-3931
http://www.smp-fabworks.com

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