Yes, we are talking about super chargers here

I'm designing a custom supercharger, because a mate of mine here can do metal fabrication a pretty cheap and I already have a lot of the things that are in the vortech/comptech kit. (Injectors, Fuel Pump, Computer etc)

I'm tossing up between an Eaton's Roots type super charger and a Vortech Centrifugal one. I've heard that the Vortech blower produces too much of it's power too high in the powerband to be useful for anything. Apparently peak power is at 8500rpm and it's a pretty steep gain to there (meaning that low and mid end doesn't get much boost).

On the other hand, I've been told that neither roots nor screw type positive displacement super chargers can continue to produce good boost to 9000rpm.

Does anyone have any thoughts on which super charger will make the best USABLE power? Also, I notice that Vortech make a normal supercharger and a "super quiet" supercharger. Is the normal one audible in day to day driving? I want to keep it as quiet and as "sleeper" as I can. (As much as a beautiful beast like an S2000 can be a sleeper!)

Thanks!

 

I'm actually looking to do the same thing. You damned oversea's guys get extra room to play with on the intake manifold side. Its not as easy over here as it would be for you!

If you're going to do a custom job, I would go with a roots or whipple charger.

Blake

 

Thanks for your reply, Blake.

Why do US S2Ks have less room on the intake side than the Australian ones? Something to do with Left/Right hand drive?

Secondly, why do you think a Roots type super charger would be better? Do you have any particular manufacturer in mind? And what's a whipple charger?

Ken.

 

Yes...damned steering is in the way. Master Cylinder too.

Actually, if you are having it mounted to the manifold, similar to the Jackson Racing superchargers, you might have to be wary of the ABS and the hard brake lines.

Well, theoretically, the screw type charger will give you a much better curve, resulting in hopefully faster times. Also, it would be much more track friendly, especially if you fall out of VTEC.

The Whipple charger is another design that actually compresses the air in the supercharger. The Roots compresses the air in the intake manifold. Whipple runs cooler than the Roots, which I've heard it said that you almost have to have an aftercooler with a Roots to get the most out of them. But the Whipple chargers are much less efficient when the engine is not using all air being forced into it. Has to do with it always compressing the air, causing it to use more power when the engine is under vacuum.

Check these links: http://home.att.net/~jroal/blowers.html

It has links for Eaton (Roots) and Whipple superchargers. They both have their advantages. I think I'll end up trying both and seeing which works better.

Blake

BTW, I think the mst popular Roots SC manufacturer is Eaton, who uses Magnuson to sell to the public (see link).

 

reduce weight(radically) and maximize NA power mods.....the result will be
acceleration comparable to FI(by numbers) but without the parasitic effect of blower, the resulting throttle response and power curve will be more satisfying than supercharged.

 

Please keep your post on topic. He didn't say he wanted to go NA. FI has more potential on this car than NA. If you aren't going to benefit the discussion, please stay out of it.

Blake

 

Comptech says that when they were developing the SC for the S2000, they tried the Roots type. They chose to go centrifugal because they said the roots type would not hold up to the high RPM nature of the F20C. I know someone JDM makes a roots type, but who know's about the quality, and you must also consider that they only keep the cars to 40,000KM, so who knows how they will last. Just thought I would add my thoughts on that.

Chris