[Fot] Diff ratio for Road America

[Scott Janzen]

I've only been there for the Kastner Cup, 3.89 diff in my GT6, 7,000 RPM redline, and Scott is right - the main straight and the one back down are a long time at redline.  That said, I found gearing elsewhere to be good, though I do run a close ratio TR6 box, so 2nd gear is really tall.

On Aug 28, 2016, at 10:36 AM, Barr, Scott wrote:

Which tires?  Roughly 22" diameter?  I generally used a 3.89 there, but it's an awful lot of revs for a long time if you have no overdrive.  I tried a 3.27 once, but the Spit didin't have enough grunt to pull that gear, and I was drag-limited to about 88 mph.  Not ideal either.  Maybe the GT6's additional torque would make the 3.27 gear work just fine.

I will try to remember to send you a gear calculation spreadsheet which I have on my computer at work...

Scott (B.)



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-------- Original message --------
From: David Amys <damys at charter.net>
Date: 8/27/16 10:26 PM (GMT-06:00)
To: fot at autox.team.net
Subject: [Fot] Diff ratio for Road America

-------- Original message --------
From: David Amys <damys at charter.net>
Date: 8/27/16 10:26 PM (GMT-06:00)
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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