sumir brahmbhatt

so just by looking at the pictures would anyone be able to tell what kind of sc it is?

mingster

looks like it's a similar setup as comptech's SC.

bgrubin

Vortech is the same garbage centrifugal S/C that comptech uses.

* Same parasitic drag as a roots blower
* Major lag in producing boost like a turbo has
* Low efficiency limited to single-digit boost
* Complexity of a belt-driven system

None of the benefits of a roots/lysholm blower and all the shortcomings of a turbo. Someone remind me why companies produce systems around these units? Oh yeah.. they're cheap.

We need to start a major campaign to get Whipple to make an import system.

Cheers,
Ben

RT

arm-chair tuners unite
BTW, Comptech uses a garbage Paxton (just in case there's any confusion)

RicePimp

It's a centrifigal blower. So the basic characteristics should be similar to the comptech blower (as with any centrifugal blower). The biggest (only?) advantage over a turbo would that there is no lag. However in a centrifugal unit boost doesn't build linearly so the big gains are only on the top end. Down low you get very little boost and parasitic loss. With a turbo, lag can be an issue depending on design, but since the turbine is driven by exhaust pressure you can get high boost levels relatively low, and a turbo is more efficient and you can typically run higher boost, though that isn't really an issue with the s2000 engine. With your low displacement, high compression engine what you really want is boost through as much of the powerband as possible. Unless all you want is boost up top a turbo would probably be best. Even a constant volume design like a roots blower isn't going to equal a turbo. In theory the turbo should do a much better job of really changing the characteristics of the engine. A blower can never really do that. You don't have as many variables to play around with. You are limited by the belt driven nature.

On the other hand Vortech knows superchargers. They may be able to better match the supercharger itself to the engine, than with the comptech unit. The cooler opens more doors too. Also if they do any ECU work that might let them run with more boost. If I had an s2000 I'd be most interested in the price. Vortech should be able to offer this relatively cheap. They currently offer a system w/ aftercooler for a civic for under $5k, and most of their systems are in that price range. So while a turbo may be ultimately superior, this may be a better value, and blowers are typically much easier to install.

bgrubin

[QUOTE]Originally posted by RicePimp
[B]It's a centrifigal blower. So the basic characteristics should be similar to the comptech blower (as with any centrifugal blower). The biggest (only?) advantage over a turbo would that there is no lag.

RicePimp

Yeah, I figured that was what you meant. I wasn't trying to correct you. I just don't know any other term to describe the kind of lag that you get with a turbo.

In any case you had a point, it would be really nice to see is someone design a a system based around a screw type blower. Those compare a lot more favorably to a turbo and get boost really low, even compared to the smallest of turbos. It's hard to predict exactly how an engine will take to a particular system without putting it on a dyno, so it would be nice if someone would at least build a home-brew system as a basis for comparison in the real world so that we don't have to resort to "arm-chair tuning" as RT puts it and really know what would happen with a smaller engine. Even something like this would be interesting to compare to the comptech system. Anyone willing to cut a hole in their hood?

JRM

[QUOTE]Originally posted by bgrubin
[B]

Vortech is the same garbage centrifugal S/C that comptech uses.

* Same parasitic drag as a roots blower
* Major lag in producing boost like a turbo has
* Low efficiency limited to single-digit boost

RicePimp

[QUOTE]Originally posted by JRM
[B]

Tanqueray

Several people have talked about one design being more 'efficient' than another design.

How are you defining efficiency? The amount of heat added to the intake charge? The amount of power lost to create more power? The pumps volumetric efficiency?

Inquiring minds want to know.