A new twist on twins - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 08-29-2006, 12:22 PM   #31
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One of the greatest things....perhaps THE greatest thing about a supercharger is the instant torque. We produce boost at very low RPM'*. Even small turbo'* as twins cannot achieve this.

The dual boost with the turbo/sc setup is very common. It'* been done many times over the years, and both units have actually been produced by GM back in the 1940'* 'conjoined'.
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Old 08-29-2006, 01:58 PM   #32
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Yes nothing can touch a belt driven Roots blower off the line, but they heat up very fast, and lose a lot of effeciency up high.

A lot of dual boost setups will have a clutch on the nose drive like Mercede'* supercharged setups, and release the supercharger when the turbo kicks in to remove the drag from said motor.

But the only time in any racing is that low rpm boost used is off the line on a drag strip. Any other road racing, etc, that rev range below turbo spooling isn't used. Turbochargers are also more effecient when sized properly, especially over a roots application. All FI setups have benefits, but when ultimate power is concerened, the elegance, and effeciency of a turbo is hard to beat.

It'* not a coincidence the fastest 3800'* all have turbo'* on them...
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Old 08-29-2006, 03:43 PM   #33
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We should've known, guys...

If Bill were really going to do this, he would say something sneaky like "There'* something in the works"... Then he would hit us all with pictures of the finished product and a precautionary statement like "Testing hasn't been finished on this setup yet... Still a lot of data to collect before I can recommend anyone else try it."

We've got you pegged, Bill! I think you should just go ahead and do it anyway, since to got the ball rolling.
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Old 08-30-2006, 12:35 AM   #34
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I'd do a full drivetrain swap
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Old 08-30-2006, 01:38 AM   #35
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You suck.

And yeah, instant torque is great from the roots, but it also allows for instant KR, thanks to low RPM, high boost situations. Which is a major reason I'm looking into turbos myself.
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Old 08-30-2006, 03:46 AM   #36
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Quote:
Originally Posted by chadow427
You suck.

And yeah, instant torque is great from the roots, but it also allows for instant KR, thanks to low RPM, high boost situations. Which is a major reason I'm looking into turbos myself.

With GP'* it'* instant 12'* or 11'* with an otherwise stock motor..
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Old 08-30-2006, 04:57 AM   #37
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Heck, if you use a turbo that takes a while to spool, it'* like built-in traction control off the line

No use making huge power if you can't put it down to the pavement.
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Old 08-30-2006, 10:00 AM   #38
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Oh, you mean like right now? But that'* the FUN car. I haven't driven it in a month if you can believe that.
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Old 08-30-2006, 10:04 AM   #39
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Rerember the boy or was it the ex-marine who cried wolf?
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Old 09-03-2006, 03:10 PM   #40
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Blast, I wanted to read of the twin turbo project
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