Re: Re: Re: Re: SciTeck-twin turbos (Jason)

From: dakota 318 4x4 (dak3184x4@hotmail.com)
Date: Wed Apr 26 2000 - 15:48:19 EDT


ok now i want one damnit :)

With a twin turbo setup, you can optimize one turbo for low RPM's and try
>to diminish the turbo lag.
>
>In general, a turbo can reach much greater boost levels than a SC.
>Remember too that a SC has to be driven by the engine itself which is a
>substantial parasitic loss. For example an SC providing an 8PSI boost
>level might take away 50+hp from the engine just to turn it! The turbo's
>are turned by the exhaust flow. If there isn't any exhaust flow, there
>isn't any boost! Hence the reason for "turbo lag" at low RPM's. SC cars
>have the power almost immediately. Much superior for low rpm/high torque
>needs. But you're not going to get a street SC with much more than 10 PSI.
>Even relatively small single turbo's can make 10PSI look like child's play.
>
>So the short answer is that a twin turbo setup will probably kick an SC,
>BUT!!! You can't simply slap major boost on a stock 3.9 (or nearly any
>stock engine). I really couldn't imagine putting more than 8 psi through a
>stock 3.9. I know I'm pretty conservative, but for most of you I doubt if
>you're really looking for dedicated drag toys. For 8 psi, twin turbos is
>major league overkill!
>
>Now if somebody wants to completely rebuild and modify their 3.9, then you
>can have some serious fun with a twin turbo setup!!!
>

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