I finally installed my thermocouple and wired up the pyrometer gauge that's been in the car for almost 1/2 a year now. Since I might do a valve job sometime down the road and don't want to remove the manifolds twice, I opted to install the thermocouple temporarily on the downpipe and welded a bung right after the downpipe joint. It is a VDO pyrometer kit.

What is the typical response time for a pyrometer gauge? I warmed up the engine for about 10 minutes at idle and it didn't move from the minimum reading of 250F. Out on the open road, it was very slow to adjust to throttle positions. It took around 30 seconds to get to the max of 750F at WOT running 3200rpm and 12psi boost (I modulated the speed in "S" with my left foot ). After the run, I continued on at about 10% throttle with the temp dropping very slowly (30 sec) to about 450F.

What's the deal? Is this because it is post-turbo? What are typical idle and WOT temps pre/post-turbo?

Thanks for the help!

__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)