Brushless Bosscat gearing

[1911Colt]

I have a HW 10.5 for my Bosscat. The motor manual says to gear for ~8.00 final drive. I can, or could, achieve this with 28/92, except 21 is the largest pinion that will physically fit with a 92 tooth spur. (I don't have any smaller spurs.) 92/21 x 2.42 = 10.6 FDR.

The Bosscat manual was written for brushed/NiCad of course. 10.6 FDR is about what it recommends for a 13 turn brushed.

So, what do you folks think? Don't do it? Try it and check temps? 10.6 and 8.0 seem to be worlds apart, however a 10.5 brushless is probably reasonably close to a 13T brushed.

I am not racing. I will probably just put slicks on and run on pavement. Run time is of no concern.

[juicedcoupe]

It'll probably still be much faster than the vintage chassis and drivetrain can handle.

[Retro rc]

Definitely need to go 8.0 or even as low as 7.6 you should be able to find a 86 or 89 t spur easy enough. Do you have a slipper fitted or is it just the u 277 layshaft?

I’ve run as low as a 8.5 on original transmission just make sure your diffs belts and slipper are set right

[1911Colt]

It has the original slipper. It is the Bosscat "competition" (1992?).

[1911Colt]

you should be able to find a 86 or 89 t spur easy enough

How right you are! I finally got the ship notice on my Cougar. It has an 86 tooth spur standard according to the manual and exploded view. I have the pro transmission (can't call them "tranny" anymore, that has a new meaning) for it, so will use the 86 on the Bosscat.

[Retro rc]

The 86 won’t fit on the bosscat, the slipper spur is different to the cougar I’ll try and post some pics later on for you.

[1911Colt]

I have the 86 tooth spur from the Cougar Classic now. It seems that all I need to do is cut away the center section (the thick center with provision for the drive pin). The 2 screw holes to attach the spur gear to the Bosscat splipper housing are there and in the proper location. I won't even have to cut with surgical precision, as the 2 screws will locate and align the spur. Good thing, "surgical precision" has never been an option for me.

My Top Cat and 1 of my 2 Cougars will run the pro transmission, so I don't mind cutting the one spur gear.

Random observation: the re-re Top Cat is essentially the same car except for the front suspension, but came with a 95 tooth spur gear vs the 86 on the Cougar. Good on Schumacher, as the 86 is probably useful in more scenarios than the 95.

[1911Colt]

For future reference- Drilling a 5/8 inch hole through the center of the Cougar/Top Cat spur gear worked perfectly. It bolted directly onto the Bosscat slipper.