Savage XL-E

Speedwise, how is electric compared to nitro?

[Savage03]

Got my 3 speed cluster out and wondering did you use something specific for the spacers?

[Janezki]

clowkoy: I'm not the speed freak, but I think the truck should go just fine and accelerate faster than nitro version.
Should - because there will be snow and ice in here for atleast next three months, so not much grip available for serious testing...

Anyways, this is what I got from the top speed estimator:

Differential Ratio: 3.3076923076923075
Transmission Ratio: 1.8894009216589862
Other Ratio: 1
Spur Tooth Count: 47
Pinion Tooth Count: 16
Total Voltage: 22.2
Motor KV: 1668
Tire Diameter (inches): 6.69
Tire Ballooning (inches): 1
Motor Current Draw: 66
Motor coil Ω: 0.0114
Spur/Pinion Ratio: 2.94 : 1
Total Ratio: 18.35807 : 1
Tire Circumference (inches): 27.3 inches (693.43 mm)
Total Motor Speed: 35774.6 RPM
Vehicle Speed: 50.38 mph (80.93 km/h)
Estimated Adjusted Speed: 47 mph (75 km/h) - 7% loss
Effective KV Value: 1611.47
KT constant: 0.81 oz-in/A
Motor Torque: 0.28 ft-lbs
Final Torque: 5.12 ft-lbs
Final Power: 1465.2 watts (2 HP)


Savage03: There are three spots that you should check:



- to keep left bearing on it's place, use something that fits the axle and is the right lenght.
I used inner part of E-Maxx front driveshaft, which was cut to right lenght.
It is possible to use the clutch from 3rd gear, just remove all the moving parts.
- to remove sideplay from the axle, I used two 6mm shims between bearing & c-clip
- to remove sideplay from maingear axle, I used one 8mm shim behind right bearing
Shim could also be put to the left side, depends from the position of idler & main gear, the goal is to get them "inline".

The amount of shims may vary between transmissons, so just check that you remove excessive play and the gears still roll smoothly.
Can't remember from where I bought the shims, but atleast the 6mm ones do have a HPI part number.

First gear can be removed completely.
I left all three gears to the input shaft (where slipper & spur are) - it could also be reduced to one gear with proper spacers, but seemed a little too much hassle...

[doo540]

Nice write up on the locked tranny!
I'm still using the stock 3 speed with Neu 1515 1y on 4s with the mmm
Top speed right know is 48 mph (radar) with Losi Bolt-On tires.
I went thru 3 stock diffs, now I'm running Cen Gen ring and pinion conversion.
My motor mount is up high (kershaw design) and my lipo is inside the frame above the driveshaft and below the motor. Nothing hanging on the outside of the frame. Still using stock brakes, seem to work ok for me. I like watching the truck move around as it shifts thru the gears. I haven't done a speed run with the new gears, I think they are 10% faster then teh stock rear end ratio.

[Savage03]

Thanks for the detailed write up helped alot. I got mine all finished, I found that 2 tamiya bushings worked perfect so shimmed the main gear as well like you said, never paid much attention to just how much play their is in the center trans! Now their is no play and they line in perfect.