My car was RR'd in 4th when I went a couple of weeks ago! The biggest
problem all the turbo cars had was the weather and as the tdi has a side mounted intercooler it really doesn't
help! Guys at TSR said try it on a winters day and it should be more accurate. I believe the rollers their are pretty accurate as somebody put a
mk4 ibiza cupra on their and it came out as 180.5 bhp which was spot on! However he did have a FMIC! Like devonmikeyboy said their fan is crap and really doesn't
help turbo cars!
I would really look into your map situation as in my experience that is normally where the
problem lies!
Matt