Originally Posted by aaronb73 (Post 9204539)

Anyone running a novak ballistic 4.5 550 with the 14mm rotor? I'm on the fence whether to run the 4.5 with the stock rotor, the 14mm rotor or just scrap that idea an get a 5.5 (considering a tekin if going 5.5). I'll be running this with an RX8 esc.

Gearing on the stock rotor using the manual's recommended 12t pinion seemed to be on the slow side, 13t would probably be better. If going with the 14mm rotor I'd have to pick up at least a 16t, 17t pinions, probably need higher?

Originally Posted by t4mania (Post 9204639)

I spoke with Brent at Novak & he said the 14mm rotor provides more torque but you lose about 1200kv also. So it seems you can either have more torque or more RPM.

Originally Posted by JEFFs SC10 (Post 9203916)

anyone have trouble running the 48 pitch spur? I'm stripping the teeth under deceleration/braking and a little under acceleration. I checked gear mesh and I was good, just think these teeth can't hold.

Looks like I may be going to 32pitch for good insurance.

16/62 with a CC3800 kv sound right?

Originally Posted by TocSin (Post 9204967)

I've been running 48p with a Castle 1410 with no issues. Nice and quiet too. Ran it that way to take 5th in 4x4 SC at the Hank Perry 240. Never even had to take the gear cover off that weekend. I have the brakes on the RX8 turned down to around 50 though, and I'm usually pretty smooth with the throttle. That 4 pole will bring it right up on its nose with full brakes, which is hard on the belt, pulleys, spur...body...:lol: Spent a little time getting the mesh perfect though with full tooth engagement.

How narrow are your pinions? The ones I'm running are nearly identical width the the spur. The super skinny RR ones put a lot of torque on a small tooth face on the spur.

Originally Posted by ktm11rider (Post 9196476)

First run out with it. Totally stock setup. Might try heavier diff fluid up front and could use swaybars. Handled great overall though

http://i999.photobucket.com/albums/a...ider/hank2.jpg
http://i999.photobucket.com/albums/a...ider/hank1.jpg
http://i999.photobucket.com/albums/a...r/HPIM2183.jpg

Originally Posted by ffpm46 (Post 9197523)

Have they started shipping yet? I ordered on the 24th, haven't seen them.

Originally Posted by Ridley (Post 9200259)

I'm still not happy that Lutz was a few tenths faster than my lap times so I have some work to do :sneaky:

Originally Posted by JEFFs SC10 (Post 9203916)

anyone have trouble running the 48 pitch spur? I'm stripping the teeth under deceleration/braking and a little under acceleration. I checked gear mesh and I was good, just think these teeth can't hold.

Looks like I may be going to 32pitch for good insurance.

16/62 with a CC3800 kv sound right?

Originally Posted by JEFFs SC10 (Post 9203916)

anyone have trouble running the 48 pitch spur? I'm stripping the teeth under deceleration/braking and a little under acceleration. I checked gear mesh and I was good, just think these teeth can't hold.

Looks like I may be going to 32pitch for good insurance.

16/62 with a CC3800 kv sound right?

Originally Posted by CraigV (Post 9200456)

That number is the number of times that the motor has to make a complete revoluotion for every revolution the tires turn.

For example, the SC10 4x4 has an internal transmission ratio of 2.57. If you were to use a 62 tooth spur gear and a 12 tooth pinion gear, the final drive ratio would be:

FDR = (spur / pinion) x Transmission Ratio
FDR = (62/12) x 2.57
FDR = 13.278

That means that the motor has to revolve 13.278 times for the wheels to revolve once.

Let's say we have a 3800 kilovolt motor running at 7.4 volts. The motor would be turning at (3800x7.4) = 28,120 RPM or rotations per minute. So, in one minute the motor will turn 28,120 times.

With a FDR of 13.278, the wheels will turn (28,120 / 13.278) = 2,117.79 times.

If we decrease the FDR by raising the number of teeth on the pinion gear by two, we get an FDR of (62/14)x2.57 = 11.38. This would mean that during the same minute that the motor turns 28,120 times, the wheels would turn 2,471 times, which is 353.2 times more often than with the smaller pinion gear.

Since the wheels are turning more often (and hence faster) during this minute, the motor is using more power (drawing more amps with the same amount of voltage). This causes the motor to get hotter, and your battery to drain sooner.

Craig

Originally Posted by BlueGlowBoy (Post 9204595)

Anyone have any suggestions for how to fit the 17T pinions onto the truck? I can't seem to get an Allen Key in there at an appropriate angle to tighten it down, and it is too big to fit through the hole in the motor plate....

Also, in case anyone was wondering....the slipper pads fit the GT2 54T spur, but without modifying the motor plate, there is no way to get the 17T pinion close enough to mesh. (you'd probably also have to shave off some of the chassis and transmission case too...but I didn't bother looking that closely yet...)

Originally Posted by T-BirdJunkie (Post 9205277)

ThunderbirdJunkie's 3800 came off the track at under 130*F after 23 minutes on the track at 15/62, so he went up a tooth. Dunno how it's gonna act, but 1 tooth should be more than dandy.