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Originally Posted by NN5I
(1) What are Timbrens?
(2) When I was a boy, we used to do stuff like that to vehicles. We called it "hopping up" and we thought it would make it faster, but no one ever suggested, or believed, that it would improve fuel economy.
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There is a company called Timbren and they make "suspension enhancement" products. These products are mostly a variation on a single theme. You replace the little rubber bumper on your frame above the axle with one of their products (called "Timbrens" by most folks). The Timbren product is a larger version of the axle/frame bumper, made of softer rubber and has a spring inside.
The Timbren does not touch the axle until the truck is loaded (or over loaded, or you hit a massive pothole) Then the Timbren acts as a helper spring and increases the load carrying capacity of the axle and levels out the ride a bit. Unloaded there is no contact with the axle so daily use ride is not effected.
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Increasing the ease of air going in and exhaust going out will improve horse power a bit. Because the internals of the engine were not modded, these improvements have been known to increase fuel efficiency as well.
But only for those who drive it right. Driving it wrong, however, has proven to be much too much fun.