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<div>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. </div><div><br></div><div><br></div><div><br></div><div id="composer_signature"><div style="font-size:88%;color:#364f67" dir="auto">Sent from my Verizon 4G LTE smartphone</div></div><br><br>-------- Original message --------<br>From: David Amys <damys@charter.net> <br>Date: 8/27/16 5:34 PM (GMT-08:00) <br>To: fot@autox.team.net <br>Subject: [Fot] Diff ratio for Road America <br><br>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.<br>Thanks<br>Dave and Alex<br><br><br>Sent from my iPhone<br>_______________________________________________<br>fot@autox.team.net<br><br>http://www.fot-racing.com<br><br>Donate: http://www.team.net/donate.html<br>Archive: http://www.team.net/archive<br>Forums: http://www.team.net/forums<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/norlinengineering@comcast.net<br><br><br></body></html>