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[sam_a156]

Quote: Originally Posted by roland2003 (original)

Hi sam, a common error on RR's is calibration of the RPM to roller speed (mph ).
The best way is if the RR software is able to link to the cars ecu through OBD2 link , that way its bang on. The way alot of RR operators do it is to hold it at 3000rpm in whatever gear your using on the rollers and enter that. ....there is scope for error doing it this way. Power v rpm on the plot will then be wrong.
Are they correcting for ambient temp/ambient pressure and charge air temp. Or have they got a fan that replicates 'on the road' charge air temps?

Oh, that must be it. In fact I saw him doing that before the actual run: revving the car to about 3-4k rpm. That explains the "shifting" of the curve on the 2nd run.

To my knowledge no ambient temp/ambient pressure corrections were applied. They naturally have a fan, but I seriously doubt it would adjust the air temp.

The thing is, that you have to appreciate that I have a little communication problem with the local folks as my Polish is limited to ordering in a restaurant...and their English (not to mention Finnish) is likewise often not very fluent. When tuning using the sign language things may get lost in translation.