That is an unfair comparison:
A single Supercharger vs. Twin Turbos? Uhhhh....compare them on a one-one
basis and the Supercharger will win. If you want another example of Turbo
heat and lag from Paxton Tech Q&A. (We can quote different opinions/results
but the fact still remains that for the money, you can't beat a
Supercharger.)
"Turbochargers are powered by exhaust pressure while superchargers are
driven from the engine crank pulley. Superchargers allow you to attain boost
and horsepower on demand. A turbocharger requires the exhaust pressure to
build resulting in a "lag" in horsepower increase. A turbocharger will
typically have a higher discharge temperature than a centrifugal
supercharger. This higher temperature is a result of the turbo impeller
spinning faster and the heat generated from the exhaust gas."
- Bernd
BTW: They use the Vortech as a comparison...they should be using the Paxton
since Vortech was a spin-off from Paxton manyt moons ago. Yes, the original
designers couldn't get their sh*t together so a few of them broke off from
the company and formed Vortech....still, a slightly inferior (but good)
design to Paxton.
-----Original Message-----
From: owner-dakota-truck@buffnet.net
Subject: Re: DML:ATI Supercharger Kit
Here Ted, take a look at this page.....this should explain my reasoning.
And I was wrong, 12psi from a supercharger is not the same as 12psi from a
turbo, as explained in the clipping from the webpage below.
http://www.gcoast.com/turbo/technical.html
(this excerpt taken from link above)
This effect is shown rather dramatically when comparing an intercooled to a
non intercooled setup. A Vortech s-trim producing a measured 8psi on a stock
5.0 will generally add between 100-120 rwhp. The Incon twin turbo in
intercooled fashion can add close to 200 rwhp on a stock 5.0 at 8psi.
Of course part of that difference in rwhp can be attributed to the lower
parasitic loss of the turbo but it still serves to illustrate the fact that
manifold pressure is not a very good indicator of hp across setups.
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