Deffo being doing that if I've cocked up and gone too low. All calculated values in Table 4.1 are based upon given module m and number of teeth (z 1 and z 2).If instead, the modulem, center distance a and speed ratio i are given, then the number of teeth, z 1 and z 2, would be calculated using theformulas as shown in Table 4.2. Great track.Īre you local to Silverstone? You're welcome to come see what the 3.9 feels like.Įdit: Another tip Sparrow offered was to use 205 section tyres rather than the usual 195's - slightly taller profile lengthens the gearing a little. NOTE 1 : The subscripts 1 and 2 of z 1 and z 2 denote pinion and gear. ![]() I took the car with its old 3.6 FD down the hangar straight a few years back, and used 5th, the only time on the GP track. Will be good to compare onboard vids from Rockingham and Donington. If you're curious how changing ratios will affect your gearing, this tool will remove the guesswork. I worry the top end is too low but I think I'll be Ok. Gearing Calculator This is a gear ratio calculator designed to help our customers decide on the best transmission and differential choice for their purposes. I'm yet to draw conclusion on the lower final drive choice as I haven't revisited the tracks I go to, yet. ![]() Have a look at the thread below, where Eddie and Nige help me out with some great info. The 3.9 is great, the car is savagely quick in 3rd and 4th, and gets to the redline in 5th very quickly (along with proper torque steer). I changed it from a 3.6 (CBA) which was great on the road but I was only using 2 gears on track most of the time, 3rd and 4th. ![]() I have an EGU code 02j in my 20vt Mk2 which is 3.9. Blimey, the 4.23 FD in your car must be totally barking mad. 755 gearing youll need: 02a311361Q is 142.77 and 02a311158E is 226.05 For the.
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