mn6 to mn12
Race Director
Joined: May 2005
Posts: 15,960
Likes: 21
From: West Norriton PA
St. Jude Donor '08
Actually they should gear for the trap speed and stop adding power when they cant get the power to the ground anymore. 60's fall with gearing. Gears slow the rotation speed of the tire which lets you hook faster (actually it hooks when the car reaches the speed that the tire rotation is at).
I am more interested in top speed and handling. The Z06 tranny was primarily geared for road racing not drag racing.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Most road race circuits are spent in 3rd and 4th gear with an occasional 2nd. The MN12 2nd gear is lower then the MN6s 2nd gear and many times the MN12 2nd is just too low of a gear.
LS1/MM6 LS6/M12
1st Gear 2.66:1 2.97:1
2nd Gear 1.78:1 2.07:1
3rd Gear 1.30:1 1.43:1
4th Gear 1.00:1 1.00:1
5th Gear 0.74:1 0.84:1
5th gear is a non issue as it is TOO high for most circuits. If you have the GM Motorsports gear box with a .85 5th gear ( MN12 5th at .84 too ) then that would be used occasionally too.
Gearing is always a challenge. Too make up for gearing raise the red line, to you can run 6800-7000 rpms
Instructor
Joined: Nov 2008
Posts: 156
Likes: 0
From: Manning SC
Actually they should gear for the trap speed and stop adding power when they cant get the power to the ground anymore. 60's fall with gearing. Gears slow the rotation speed of the tire which lets you hook faster (actually it hooks when the car reaches the speed that the tire rotation is at).
I know this is an old post but I find this very interesting primarily because I have no idea what you're talking about.
Could you expound on this?
