Not that Im an expert because Im not but from the 3 cars Ive had dynoed on the road and also stand. Id do road. The cars behaved very differently on the road with varying conditions hills, etc.. that a stand dyno cant replicate. Just my .02's However a stand dyno is a great starting point for tuning. Not sure about the differences in bike and car engines though.
Edited by PhotoguyUSA, 14 November 2007 - 10:20 PM.