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A while ago, I wrote an article in an attempt to help customers and installers understand what a polyurethane bushing really was, because there was an overbearing assumption among the sport tuning community that poly was just a bushing that was harder than rubber. Well, in most cases that is the case, but in practice both rubber and polyurethane can achieve the same level of stiffness. The hardness of the polyurethane or rubber can be altered to whatever the manufacturer may see fit.
However, nearly all standard rubber bushings are designed to be soft, to keep OE stock handling cars easy on your spine. They are kind of ugly, and break down pretty significantly over time. Polyurethane, however, has become a standard in all tuning circles. Polyurethane looks great, has superior resistance to heat, chemicals, and the elements, and when properly greased with the right lube they can withstand severe punishment seen in track duty. We have had a line of ProParts poly bushings for awhile, but now the king has entered the building, with huge availability, superior engineered design, included proprietary long life grease, grease retention systems, and a lifetime warranty.
So popular that we have had customers asking for it by name for years now, it is finally time to stock the shelves with Powerflex Polyurethane bushings. This new product line (that has been familiar to many of you for quite some time) will completely build out the rest of our SAAB line, offering performance bushings options we were never even close to achieving in the past. In addition, we are finally able to service a huge selection of bushings for BMW, as well as VW/Audi, Volvo, and MINI.
We have control arm bushings, subframe bushings, sway bar bushings, differential mount bushings, engine mounts, transmission mounts, shock mounts, bushing inserts, bushing kits, you name it we got it!
Unlike other polyurethane bushings, Powerflex has very carefully re-engineered their bushings to be stronger and more resilient than nearly all other polyurethane options. They do this by design. Most poly bushings require yearly maintenance to reapply grease and prevent binding and squeaking. Powerflex polyurethane bushings have specially designed surfaces to hold the grease in for longer, and provide better surface area contact to prevent binding. Because of this, all Powerflex polyurethane bushings carry a lifetime warranty against tearing and noise, which is quite impressive indeed, ESPECIALLY for parts that are designed for sport and racing applications, in addition to high mileage street use.
How stiff you want them is your choice, and we supply a few different options:
Powerflex Street Series:
The street series is geared towards street driven cars that may encounter rough roads, carbonated beverages, and children in the backseat. They are the compromise between a teeth shattering track car and a floaty bag of potato salad. There are two colors of bushings in the Street Series, each describing a durometer rating. The Red is for high heat applications, such as exhaust and engine mountings. Moving up the scale is Yellow, which is somewhere around 70. This should be considered closest to a street bushing match, with the extra benefit of longevity and resistance to wear over Rubber.
Past that is the most popular Powerflex bushing color, Purple, which generally dials in around 80 on the Shore-A durometer scale. Some of these bushings are also composed of metal sections, reducing the amount of actual bushing material and further stiffening the overall attitude and strength of the bushing assembly. Occasionally these applications will feature a black bushing, just to make sure longevity is ensured, even though the line is still technically Powerflex Street. Some BMW trailing arm bushings fit this bill due to heavy abuse.
Powerflex Black Series:
These are the racing line of Powerflex bushings. They will be the stiffest, and will feel almost solid compared to the street series and other types of bushings. They come in around 90 on the Shore-A Durometer scale, which is about the same density as a shopping cart wheel.
These are the bushings you want when you are truly concerned with things like camber flex and turn in response. Completely building your car out with Powerflex Black Series polyurethane bushings will make it feel tight. Super tight. It will rattle your teeth and jostle your spine, and as soon as you get on the track it will all be worth it. It’ll be responsive, smooth, and track well. Best of all, it will communicate well with the driver, who will feel every bump and crack in the track. They will also feel exactly what your tires are doing, allowing the talent to become one with the machine and inch ever closer to the limit.
If you are on the fence about whether or not you need poly bushings, keep in mind that many polyurethane Powerflex bushings are made as two parts, which is really cool because you don’t have to press them in. You just push or cut the old bushings out and grease the new two-part bushings up to slide them in. Then the rest is cake!
Enter your vehicle in the eEuroparts.com vehicle selector and click this link to see what Powerflex bushing are available for your car!