FLM Tranny Forward Brushless Conversion (FLM49000)

[_dV]

Th BP diffs don't make it easy to get an appropriate gear reduction. In my center diff conversion i'm going to try BPs + 46 spur + 16-17 pinion + Tekin 1350kV + 5s

[Bondonutz]

Originally Posted by _dV

Th BP diffs don't make it easy to get an appropriate gear reduction. In my center diff conversion i'm going to try BPs + 46 spur + 16-17 pinion + Tekin 1350kV + 5s

Do you know the gearing of the BP diffs, If not I'll go look for it. Thanks.

[thzero]

29/9

Not very far off from the 43/13 of the standard ones, i.e. 3.2 vs 3.3.

1350 on 5S might be a tad low in the rpm department. I'm looking at going with the 1.5y wind 1800 CN for a center diff conversion and like a 50/13 (could go with a 46/12 too) for target of about 45 with ProLine Badlands.

Good source of info.
http://scriptasylum.com

Also I should note that truggy diffs should probably drop right in with some shimming. I didn't fully test it, but I dropped in my RC8T diffs into the Savage bulkhead and with some minor shimming it rolled true. Didn't do anything to check the bevel gear for fitting.

Originally Posted by Bondonutz

Do you know the gearing of the BP diffs, If not I'll go look for it. Thanks.

[Bondonutz]

Originally Posted by thzero

29/9

Not very far off from the 43/13 of the standard ones, i.e. 3.2 vs 3.3.

1350 on 5S might be a tad low in the rpm department. I'm looking at going with the 1.5y wind 1800 CN for a center diff conversion and like a 50/13 (could go with a 46/12 too) for target of about 45 with ProLine Badlands.

Good source of info.
http://scriptasylum.com

Also I should note that truggy diffs should probably drop right in with some shimming. I didn't fully test it, but I dropped in my RC8T diffs into the Savage bulkhead and with some minor shimming it rolled true. Didn't do anything to check the bevel gear for fitting.

AH, I see BrianG's new version of his page and it's awesome. I also had no idea he's added the BP diffs to the speed calc,sweet.
Thanks !

[_dV]

1350 on 5S might be a tad low in the rpm department.

If i plug my values into (using the 1350kV motor, 17 pinion) Brian G's calc i get 51.98 mph (83.5 km/h) which is in the ballpark for 5s. Definitely enough rpm for top speed. Are there any other issues with slower motors?

I wanted to stay away from smaller pinions so i have just opted for a larger one but with a slower motor.

I did consider truggy diffs but thought i would try this first. They would make it possible to use a faster motor and a decent sized pinion but i'd like to try and avoid the extra cost. With Vorza\RC8 heavy duty spiral diffs (43/10) i could use a 46 spur, 19 pinion and 1550kV for 49.99 mph (80.29 km/h)

[thzero]

Other item to consider is that is some pretty serious rollout. Be interesting to see what your temps of your esc/battery/motor are.

Btw, the RC8 diffs are 43/13s just like the standard Savage so you wouldn't really gain anything from switching to those. Looks as if the Vorza (and D8), after looking at the manual, and RC8T are 43/10 diffs would give you more gear reduction. Although most truggy diffs, including the Vorza/D8, their bevel gear is attached to a cvd joint instead of just a dogbone. Someone suggested to me in another thread about the amongst other truggies... someone recommended the HotBodies/HPI Lightning Stadium Pro to me as they attach to dogbones, not CVDs.

Originally Posted by _dV

If i plug my values into (using the 1350kV motor, 17 pinion) Brian G's calc i get 51.98 mph (83.5 km/h) which is in the ballpark for 5s. Definitely enough rpm for top speed. Are there any other issues with slower motors?

I wanted to stay away from smaller pinions so i have just opted for a larger one but with a slower motor.

I did consider truggy diffs but thought i would try this first. They would make it possible to use a faster motor and a decent sized pinion but i'd like to try and avoid the extra cost. With Vorza\RC8 heavy duty spiral diffs (43/10) i could use a 46 spur, 19 pinion and 1550kV for 49.99 mph (80.29 km/h)