[s-cars] Ball bearing turbo

[djdawson2@aol.com]

No... the GT30 has a 76.2mm (3 inch) major diameter on the compressor wheel.  The 3071 has a 71mm major diameter.  The advantage is a quicker spool up (lower threshold), and improved surge characteristics (higher PRs are OK at lower engine speeds).  The cost is high end flow, resulting in a peak hp loss at high rpm.  The gain in low and mid range power is really nice, however... more fun than RS2, as it seems to hit earlier than I remember the RS2 setup doing in my car.
 
So... the comp housing is different, and so is the wheel.  As such, you will require at least the CHRA, and the compressor housing.  The turbine section is exactly the same as the GT30R, so you could probably swap your turbine section onto the 3071 CHRA.
HTH,
Dave
 
-----Original Message-----
From: Mark Strangways <Strangconst at rogers.com>
To: djdawson2 at aol.com; james.murray at ericsson.com; HAHNMGH at peoplepc.com; s-car-list at audifans.com
Sent: Tue, 18 Oct 2005 18:45:35 -0400
Subject: Re: [s-cars] Ball bearing turbo


The 3071 is just the compressor cover right ? 
Or is it the wheel as well. 
 
I have the understanding that it is just the cover, but I did want to try the Garrett turbine housing. 
 
Let me know what U think ? 
 
Mark