Gears & Axles - Need advice! please help




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98Greenz28
07-17-2012, 08:46 AM
I have a cam only A4 with all bolt ons and 3.42gears and suspension

I just upgraded to a circle d 4000 stall from a yank ss3600 and the car is not any quicker at the track (60ft is the same and mph is down) I also got new 28'' tall racemaster DRs different then my usual M/Ts 25.66" tall.

60ft is still a consistant 1.62-1.65
MPH went from 92 to 89 in the 1/8th
E/T is still around 7.60s in the 1/8th

My question is do I need a different gear ratio to accommodate the new stall and tires or should I go back to the shorter M/Ts
Or was I expecting too much from the stall change?

Thank you

Abby!!!!!!!


01ssreda4
07-17-2012, 09:14 AM
All of the above :jest: A 28 inch tire is too much on the big end for a 3.42 rear. That's why you lost mph. Up the gear or lower the tire.

FirstYrLS1Z
07-17-2012, 10:29 AM
25.66 tire with 3.42s' = 3.17 effective ratio with 28" tire.
what you gained with the stall you lost with the tire.


98Greenz28
07-17-2012, 02:36 PM
^^^ ok thank you, sorry but i am still learning and really want to understand everything!


I really dont want to sell the tires so I will change the gears to either a 3.90 or 4.10