[Fot] Diff ratio for Road America

[norlinengineering]

Looking back at my data from 2010 at RA with our Spitfire, we couldn't pull a 3.89 and had to go to a 4.11.  We were running Hoosier R6's, 185/60 13's.  With the 3.89 rpm going into turn 1 was 6400 at 106 mph.  With the 4.11, rpm was 6850 at 109.5 mph.  Hope this helps. 


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-------- Original message --------
From: David Amys <damys at charter.net> 
Date: 8/27/16  5:34 PM  (GMT-08:00) 
To: fot at autox.team.net 
Subject: [Fot] Diff ratio for Road America 

Need advice on which diff to run at Elkhart. Our first time out. GT6 with mild motor.  We have two diffs. 3:89 welded and 3:26 stock rebuild. Rev limiter set at 6,000.
Thanks
Dave and Alex


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