Re: Active Autowerke tubos <long> part 1

[rusmaster <rusmaster@xxxxxxxxxxxxx>]

Jason,    Just a couple of quick comments.  The SC can make more boost. at lower RPMs, it's just a matter of
changeing the pulley sizes.  Then you use the popoff valve to control the maximium amount at the upper RPM
ranges.  But, the SC will never give as much boost as a turbo, thats a given.  Comparing the systems isn't
quite fair, since the turbo system is so much different that the SC that you are comparing.  But, good to hear
that you like the turbo better.  Sounds like lots of fun.

Take Care,
Russ




> Date: Mon, 25 Jan 1999 08:20:20 -0800 (PST)
> From: Jason Leung <bmwturbo@domain.elided>
> Subject: Active Autowerke tubos <long> part 1
>

Snip

>
>
> I used to have a 325i, 2.5L six, with a centrifugal
> supercharger from ERT.  This was a very nice set
> up, but low end torque was lacking.  Top end pull
> was great, the thing would rev like crazy, but
> since supercharger speed was limited by the speed
> of the engine, I got maybe 1psi of boost at 3000 or
> below, 3 psi of boost at 5000 or so, 5 psi
> of boost at 6300 or so, and 6 psi if I revved the
> car to 7000.  The car felt normally aspirated
> until 4000 rpm.  And it felt like the supercharger
> created a lot of parastic drag at low RPMs.

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