Join Date: Oct 2006
Location: Killeen, TX originally Tucson, AZ
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Re: Supercharger...TRD vs URD
The question here should not be one of reliability or durability, but simply what type of power band you, as an individual driver, prefer. Roots and Twin Screws are very different beasts from centrifugals. I have no doubt that both the URD and TRD set ups are very well R&Ded and will make their respective owners very happy, but it really is an apples to oranges comparison. The rotrex in the URD should make more peak power than the roots TRD, and it should have more potential on the top end (read max HP and TQ). The TRD however, being a PD charger, will be better on the lower end until the centri catches and passes it in the mid to upper RPM levels. The centris power delivery is much more linear than the fat, almost constant torque curve of a PD. Yes, I understand that a centris low end can be improved by smaller pulleys or larger gears, but, IMHO, you cannot beat a PD charger for low end muscle. One the other hand, the only thing that beats a centri for peak numbers is a turbo and mucho $$$$. I have never worked with or driven in a rotrex charged car, but I have a lot of experience with paxton, procharger and vortech centris and magnusson and kenne bell PDs in Corvettes. The centris are awesome quarter milers and will walk most maggies all day on the track, but it is a different story on the streets...I prefer my power down low and don't care much about top end, so I will be going with the TRD set up at some point, but I can't wait for anything URD might come out with to make it better.
2007 FJ, 6 Speed, Black Diamond, 3" Rough Country, 17x9 Polished DC-1s, 33x12.5 MTZs, FlowMaster Super 40, TRD CAI, URD Short Shifter