Gear Questions

[Doug Welch]

Bill

What gear is on the front? Sounds like its geared for IMI.

[William]

Hi Doug,
The front is 12.

Thanks,
Bill

[Doug Welch]

Bill

It is geared a bit low. We run an 79/80 on depending on conditions. But your driver also has to learn to carry more speed through the hair pin. We don’t drop below 7,400 and gearing alone won’t make up the difference. All things being equal, each tooth is good for about 200 rpm. So 4 teeth will only bring it up to 6,000.

[William]

Thank you Doug,
We have been practicing that turn a lot. Is 12 in the front good? Also what do you suggest to run at IMI in the front and back.

Thanks,
Bill

[Doug Welch]

Start with the following
Centennial 12/80
IMI 13/76
GJ 13/76

Some guys run more, some less. The above will get you in the ball park

[William]

Thank you for all your help Doug. I will be testing those gears.

Thanks,
Bill

[Anonymous]

Hi
Was wondering if these ratio combos would also be used on a TAG Leopard? If not, what would be a good starting point for IMI, GJ, The Track? Does anyone have any suggestions for ratios for CRE in the Springs?
Thanks
Chris

[Jon Romenesko]

Gear ratios vary from engine to engine, as their powerbands vary greatly. Rotaxes quit making power at about 12,500, whereas leopards spin a couple thousand RPM higher.

Can’t help on the Leopard ratios…maybe someone else can chime in.

[Jason Benoit]

For a Leopard in Tag Masters we run a 11/77 at IMI and 10/77 at TTAC. I would imagine the Juniors and seniors are running a little taller.

[Anonymous]

Thanks much.
I assume TTAC is Centennial (The Track)?
Appreciate the input.
Chris

[Garrick Mitchell]

You got it: The Track At Centennial.

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