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zipzapa--
Nope! Not 10:28. Recheck your calculations on my site--I think you'll find it is 10.28:1.
The idea is fine, but check to see if you get good gear mesh with the 7-tooth pinion.
I take it you're looking for speed, so keep looking for an 8-tooth and a 9-tooth gear which mesh properly with the idler gear. The shaft hole in the pinion on these gears will often be larger than the motor shaft diameter. I find a piece of small-diameter electrical wire insulation which press fits over the motor shaft will sometimes increase the diameter so a larger pinion can be used. In fact, you might have to do that with the MT's pinion, maybe even drill the pinion hole a tiny bit larger to accomodate the insulation added to the motor shaft.
If you've looked at my MT mods section, you might have noticed I've done that with a gear box. Look for the red insulation as a part of the 8-tooth pinion on the "fast" MT gear box mod.
An interesting possibility is to cut apart the four different transfer/idler MT idler gears and use the 8-, 9-, 10-, and 11-tooth parts as modified pinion gears on your ZZ or ZZSE. And since that pinion is always driving the 18-tooth section of any ZZ/ZZSE transfer/idler gear, you have two different ways to adjust the gear ratio for your car. With different motor RPMs you add a third factor. I'll see if I can make a chart of the options in the morning.
chilli
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