View Single Post
      06-23-2009, 07:44 PM   #2
Major General
J08M3's Avatar
Drives: 2011 M3 COUPE
Join Date: May 2008
Location: NEW YORK

Posts: 6,012
iTrader: (8)

Did you give your ECU a chance to adjust to each octane change before the dyno? I think it takes about a full tank of gas of a certain octane to do that (so I've been told on here). In which case how could you do this in one day? If it's more than one day between runs you could easily see +/- 5 hp just by the weather that day.
J08M3 is offline   United_States
Reply With Quote