Need help setting up a 915 for short gears
 

Hi,

What is the best way to select gears. Is there an online guide.

I have a 74 915 that I use with my race 2.7 L in a gt4 car.

Here are my current stock gears.
11-35
18-33
23-29
27-25
21-29

What is a good source for new/used gears also.

I currently hit the shift light (set at 6800) at the end of the back straight on Mid-ohio in fourth gear. I never use 5th gear right now.

By my calculations (and assuming I am going to leave 1 & 2 alone) My new gears should be:

11-35
18-33
22-30
25-26
28-23

This is about a .75 drop between all gears instead of the larger .68 step between second and third.

What should I be looking at on my dyno sheet to lead me to a new gear range.

Looking at my dyno sheets. I see that my max torque comes in at 4900 and my max hp comes in at 6500. Should I be tailoring my gearing to take advantage of max torque or hp.

Thanks

Ed

Dear Ed,

Fine questions all, you might try moving this to the Racing Forum.

I posted this over on Rennlist but might as well do so here as well

You want to gear for the hp curve

here is a summary of what you have, what you propose, and another idea. The question becomes what top speed do you need to gear for? Any idea?
http://forums.pelicanparts.com/uploa...1081777230.jpg