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Cy, good job with the discovery. I had discussed this on another messageboard for the last 2 months, so I can relate to the ups/down of the install.
Since you have a Supra (same applies on a skyline) you can install a 5th AAA in the rear bumper. The body kit bumpers will need to have the shaft that holds the muffler trimmed off.
As far as motormount spacing, I used 1/8"th thick cuts of silicone hose under both motor mounts so I can adjust the mesh of the pinion by simply turning the screwdriver.
Another issue is the timing in the toothbrush and the beard-trimmers seems to be less than fantastic for an RC car. If you're reaching peak RPM in the first 2-3feet as you were saying, you'll definitely want to go with a taller pinion, or bump timing, because you should rev out to at least 6 feet, even with a 9t. A 13t should take it out to about 13t.
Oh and BTW, the FF180sh (nor FK180 or FF180ph) will not fit in an RSX, due to the short wheel base. And the motor isn't the same as the spinbrush motors.
Hope this helps.
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