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      01-22-2013, 10:10 PM   #48
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Drives: RR Velar R=Dynamic M4 R1200GS
Join Date: Apr 2007
Location: Toronto

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Originally Posted by CSMRX7 View Post
I have to admit that my experiences are very different. A little background, I have over 10,000 laps at my local track, where I was an instructor (which closed last summer ). I have done probably 600 laps in an NA M3 and probably 1100 laps in a SC E90 (575 and 625 kits) on this track. I never had any overheating issues, although our ambient temps way up North are lower than California.

I have been able to do much better laps with the SC. I saw appeciably higher speeds on both the front and back straight with front straight speeds increasing by 30kph on the front straight. The only place I saw any slower times was on the entry to the front straight that was a 2nd gear turn, so traction is an issue here with street tires. On r-compounds this was not a problem, so beyond requiring early braking points I didn't see any deterioration of lap times.
You were also at about 3500 asl so of of course a FI engine will maintain its power compared to a NA engine which will have a loss of 3% per 1000 ft per altitude increase.Your increase compared to stock will be much greater than someone who operates much closer to a sea level pressure altitude like Laguna Seca.

Last edited by Gearhead999s; 01-22-2013 at 10:21 PM.