Saw this on another Rennlisters post...forgot the string, but WOW.

As we see below:

http://www.teammfactory.com/gear-calculator#

Thanks "winders"

Go to this site and compare various gear boxes...what a great resource.

Just need to know:
1. Ring & Pinion ratio (Divide big # by small #) 9 31 = 3.44
2. Know tire diameter (Get this off of Tire Rack, or?)
3. Know Red Line, example 6,800
4. Know gear sets (Divide big # by small #), 2nd Gear 42/21 = 2.05**

**Stock 993 2nd gear

 

This link does not work:

MFactoryCompetitionProducts.com

This one does:

http://www.teammfactory.com/gear-calculator#

Is this what you wanted us to see?

 

Personally I prefer the axes flipped, rpms on X and speed on Y.

 

and it's a calculation: Shift Point: XXX Is this the RPM drop between gears?

 

Looks that way!