Greddy Twin-Turbo In Development

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On the g35/350z, there were four superchargers available: vortech, hks, stillen, and procharger. The stillen was the only roots type. The vortech and procharger were both centrifugal units. The hks was a rotrex unit.

The stillen made great torque down low, as typical of a roots, but it gave up *way* early. I know of a stillen stage1 g35 coupe down in florida that ran high 13's in the quarter at like 101mph. My g35 runs low 13's at 104mph with boltons. The undersized roots unit used by stillen is the joke of the forced induction community in the g35/350z world.

The vortech and procharger units make much more power than the stillen. But because they are centrifugal units, they make no torque. Also, they have problems holding on to the belts using the smaller pulleys. And you want to talk about reliability? The vortech blowers have had problems with bearings lately.

On Sharif's dyno(a dyno dynamics), a bone stock VQ35DE with a vortech might put down around 340whp out of the box. The same car, with say an APS single or a Turbonetics single(the second most disparaged FI kit) will put down the same rough peak power, but will also put down close to 100wtq more than the vortech.

To demonstrate the difference in torque, many supercharger owners go for shorter gears(say 3.92's or 4.0's), to get into boost more quickly. But the turbo guys, if they do anything with gears, always go to taller gears(3.54's to 3.3's for the manual guys).

And before you buy into any kind of warranty offered by Stillen, check around the g/z world to see how well that warranty worked out. I know of a guy in kentucky that slung a rod; he had his car trucked down to Atlanta and Sharif performed the post-mortem on the engine. He also did all of the footwork on the warranty. That was a couple of years ago, and I'm not sure the car's owner got everything worked out on the warranty. Also, that warranty was only offered on the Stage 2 version of Stillen's kit. If you wanted a Stage 1 or 3, you didn't have that option.