[DeTomaso] RPM drop, 4th to 5th with taller 5th gear

[Julian Kift]

Dan,

 

The best way to assess this change is to use the Excel gear ratio calculator developed by Mike Dailey. Its a great little tool, my copy is attached (will be stripped to the list) and I previously added all the available gear ratios to be able to quickly look at various combinations. The tall 5th is a 0.642 (vs 0.705 std), although a scarce 0.62 is apparently also available.

 

Prediction is if you shift from 4th at 6000 rpm (151 mph) your rpm would drop to 5000 with a std 5th and 4600 with a 0.642 tall 5th.

 

Julian

 


 
> From: dfcex at pacbell.net
> To: detomaso at realbig.com
> Date: Thu, 29 Oct 2009 23:38:40 -0700
> Subject: [DeTomaso] RPM drop, 4th to 5th with taller 5th gear
> 
> I've been thinking about installing the taller 5th gear in The Beast, to more easily dust The Dawg at a Silver State some day.
> However, The Beast needs to be in the 4,000 to 7,000 rpm range to really scream on the track.
> Does anyone know how the rpm drop would compare when shifting from 4th to 5th?
> 
> Dan
> Dan Courtney
> La Jolla, CA
> (858) 551-5455
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