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Old 02-11-2012, 03:16 PM
sdg1871 sdg1871 is offline
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Location: New York, NY
 
Join Date: Mar 2009
Posts: 899
Mein Auto: 2012 Dinan Stage 2 550xi
Quote:
Originally Posted by jimefam View Post
Thought I'd bump this for some data, today was the first test and tune at one of my local tracks so I drove the 2 hrs to the track. I barely had fuel left when I got there as the idea was to get some runs in with 93 octane and then with VP's MS109(chose it because I thought it would give me the greatest differential) so I make the first couple of passes which ranged from horrible(1st pass was 13.7@109.18) to best(13.09@109.65) then I was out of fuel to where range to empty literally said ---. I put 3 gallons of race fuel in and make the first pass. Now I had expected to see everything the same while the dme adapted but I ran 13.4@108.18! WTF? So I said it must take time adapt but I ran 9 more passes and the best I could muster was 13.28@108.35 with my best 60' ever of 2.074. I dropped about 1.5mph of trap speed and I have NO idea why. Now that may seem like a little but as a reference my friend who has a 2011 550i just like mine(on 20" also) except he has the dinan stage 2 ran his car and had a top trap speed of 111.5. So he ran just over 1.8mph faster than me with what's supposed to be a 100hp difference. I'm not sure why the difference it could be the oxygenated fuel or it may be nothing but I found it interesting and unexpected none the less.
Very interesting. I wonder if you would have run faster on 19s.
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2012 Dinan Stage 2 550i xDrive M Sport, Imperial Blue Metallic, Cinnamon Brown Leather and Light Wood Trim. Major options are M Sport package, cold weather package, sport automatic transmission, active roll stabilization, premium sound, and side and top view cameras.

Dearly departed BMWs: 2009 550i M Sport in Carbon Black Metallic and 2003 540i M Sport in Titanium Silver
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