-----Original Message-----
From: 928intl.com [mailto:Mark@928intl.com]
Sent: Friday, March 22, 2002 12:26 PM
To: 928
Subject: [928] interesting dyno results


I recently had my intake manifold extrude honed and my throttle body
enlarged from 75mm to 80mm.  The dyno test yesterday show no change on my
6.4 liter motor.  My last test 6 months ago showed 414 at the rear wheel and
yesterday was actually 410.  I was very disappointed to say the least.
Next I removed the top of my air cleaner assembly and picked up 15 hp.  Next
we removed the air cleaner and picked up another 10hp.  Now I'm at 436 at
the rear wheels but I need to find a better way to provide air to the motor.
I wish I had tried removing the air cleaner before because now I'm not sure
if the extrude hone did anything.



Mark Anderson
928 International
www.928intl.com




From: Marc Thomas [mmthomas@ix.netcom.com]
Sent: Monday, March 25, 2002 12:04 PM
To: 928
Subject: [928] 928 S4 Intakes

Some years ago we extrude honed, flowed and dyno'd an S4 intake on a
stock'er and and the same on early US runners.  Note the results on our
website!  We sell extrude honed intakes for early cars, but not for the
S4..... :)  

I did the same test on a stroker a year ago or so, and the result was still
no gain, but no loss either.  I did not flow the intake pre and post
extrudehone as we did previously as it was a "loaner".  I did note other
interesting features about the extrudehone process that may or may not
contribute to the lack of gain on the S4 intake.

As a few of us who have studied the intake carefully have noted and as Kim
mentioned, the factory did a damn good job on the intake and it will be very
difficult, maybe not impossible, to build a better dual plenum manifold that
provides as much overall area under the curve.  The design is an engineering
tour de force superbly suited for the 928 and its broad torque range.

Excellence is always in the details!

Marc
DEVEK