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

[Dan Courtney]

MD likes the fun method!


Dan Courtney
La Jolla, CA
(858) 551-5455
  ----- Original Message ----- 
  From: Mad Dog Antenucci 
  To: Julian Kift ; dfcex at excaliburre.com ; De Tomaso List 
  Sent: Friday, October 30, 2009 9:22 AM
  Subject: Re: [DeTomaso] RPM drop, 4th to 5th with taller 5th gear


  Big Foot's calculator is a great toy but the best way to find out how the new gearing affects performance in a Pantera is to add allot of speed, elevation, head winds, heat, getting airborne on hills or passing Waldman's Viper before you get to the narrows again. 
   
  Mad Dawg Antenucci 
  Team Pantera Racing 
  The 1st & still the only vintage race team in open road racing 
  www.teampanteraracing.com





------------------------------------------------------------------------------
  From: Julian Kift <julian_kift at hotmail.com>
  To: dfcex at excaliburre.com; De Tomaso List <detomaso at realbig.com>
  Sent: Fri, October 30, 2009 7:02:07 AM
  Subject: Re: [DeTomaso] RPM drop, 4th to 5th with taller 5th gear


  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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