03-05-2006, 06:37 PM
If this solution were available I am sure it would require an intercooler for optimum performance, probably and aftermarket ignition, but actually engine bay / supercharger cooling would be of a major concern for me also.
Is there really enough room in the engine bay to do this solution correctly?
They're cheap, easy to install, and thermally more efficient than roots/twin-screw, but they don't provide enough boost at low-mid RPMs. For heavy street vehicles, like Audi's, roots/twin-screw is best (large torque gains throughout the entire RPM range). You would need an intercooler for this engine to obtain reasonable boost/power without detonating with the stock compression ratio and pump gas.
Have you seen any info on the MTM (AutoRotor) or APR (Eaton) supercharger solutions for the 4.2?
03-12-2006, 12:53 AM
Here's all sorts of calcs for the 32 v ABZ engine, your enigne is 11:1....and centrifugal is the only way to go IMO.<ul><li><a href="http://forums.audiworld.com/a8/msgs/98631.phtml">My Supercharger Calcs</a></li></ul>
MTM originally developed their supercharger for the A8, and it's also available for the S4. There's a catch... it's $21,500 for the bolt-on 450HP version in the US. You don't want to know what the 500HP version costs (which requires internal engine modifications).
APR is working on a supercharger for the S4. You'll need to contact them to find out more info as it's not due out until mid Summer.
MTM - <a href="http://www.mtm-online.de/en">http://www.mtm-online.de/en</a>
APR - <a href="http://www.goapr.com">http://www.goapr.com</a>
03-24-2006, 10:44 PM
I'm lucky enough to have an Audi specialist reasonably close to my house who's a pro at sport tuning. I phoned and asked about it a few weeks ago and they said 7-1, but I'm going to wait until my B7 is out of warranty before I go with the SC.
The MTM solution is incomprehensible. I've got an '07 A6 4.2 on order that I'd love to drop a supercharger on but hell, I can get the S6 for a cheaper price than the MTM mod.
Are the APR or PES solutions going to be more reasonably priced?