[dd74]

Originally posted by Carrera3.5L
Sorry, but he's wrong, plain and simple. There are 2 different pistons available, and that is where the difference in compression is. Both motors use the same headgasket.

The "engineers" at car shows are typically sales people that are culled from the various dealerships in Southern California

I just spoke with the engineers (who don't go to car shows) at the VW proving grounds in Arizona. We have a very good technical pipeline going between us over the years where they supply us tech info otherwise unobtainable and we provide them with prototype performance parts for testing and evaluation. They further confirm that the pistons (and thus CR) are different (and not just a different part number) between a euro and US spec motor and the US versions are about a MEASURED point lower. The A3 here in the States is using the lower compression 10.3:1 pistons as well.

Our bone stock car was detonating badly on the street and dyno with 91 after we got it last March, so much so that we had to abort the dyno runs. Mixing in 5 gallons of 100 octane to raise the octane level cured the detonation and allowed us to get the 185 whp baseline number.

When we drove the car to SEMA for display in BBS of America's booth, we filled it full of 100 octane and than blended with 91 in Barstow. The car also topped out at 153 mph on I-15 with the APR software and our intake/exhaust systems.

Believe your engineer source if you want. The magazines write based on the info they are spoon fed. Many of the journalists wouldn't know a camshaft from a crankshaft.

Ralph

Are your modifications recognized by Volkswagen? Is the car under warranty after chips, intakes and exhausts are installed "closing the gap" as the article says between U.S. and Euro cars?

Secondly, Euro magazines rate the 2.0 T at the same horsepower and torque for U.S. and Euro models, which doesn't make sense if one engine has higher compression than the other. Maybe I'm wrong in this regard, but if you could share some of that "unobtainable" information you obtained, it'd clear things up a bit for me.

Thanks.