Monsterized DT03 gearing

[Saito2]

I've been noticing all the neat monsterized DT03s showing up on Tamiyaclub. For those that have done it, how is the gearing working out for you in relationship to motor temps and acceleration? Years ago some folks on here were attempting to create a more modern Stadium Blitzer using the older DT02 as a base. The consensus then was that 1. the Blitzer had a slightly geared down version of the Bear Hawk gearbox to cope with the bigger tires 2. the DT02 was not geared low enough in general (overheating motors, sluggish acceleration), although torquier 550 motors made it possible somewhat. Now the DT03 uses the DT02 gearbox, so are these monster DT03s working out ok? I'm contemplating building one myself. Thanks for any insight.

 

[iluvmud]

21 minutes ago, Saito2 said:

I've been noticing all the neat monsterized DT03s showing up on Tamiyaclub. For those that have done it, how is the gearing working out for you in relationship to motor temps and acceleration? Years ago some folks on here were attempting to create a more modern Stadium Blitzer using the older DT02 as a base. The consensus then was that 1. the Blitzer had a slightly geared down version of the Bear Hawk gearbox to cope with the bigger tires 2. the DT02 was not geared low enough in general (overheating motors, sluggish acceleration), although torquier 550 motors made it possible somewhat. Now the DT03 uses the DT02 gearbox, so are these monster DT03s working out ok? I'm contemplating building one myself. Thanks for any insight.

 

Weird, never knew that the blitzer beelte and bear hawk have different gearing...... gear boxes are the same so I wonder how that was pulled off.

[TwistedxSlayer]

The TB01 and Levant share the same diff casings but they have different ratios. The Levant is 13/39 where as the TB01 is 15/39. That’s the pinion and crown wheel for the diffs. 

 

What im saying is, it’s possible to fit different stuffs within the same gearbox’s or diffs

[ThunderDragonCy]

I have truck wheels with Schumacher racing truck tyres rather than monster wheels, so slightly smaller, on my DT03 but have absolutely zero issues with the 17t pinion and 13.5t brushless. I run it on 8 4v nimh and the tamiya ESC and even on grass never had trouble. Haven't tried it with a brushed motor but I suspect the torque of brushless system is the key. 

Having said that, I have just properly monsterized/mad bull'd the Rising Fighter with its Dt01 gearbox and that only has a minimum 17t pinion too and runs no trouble with a silver can. I guess millions of Mad Bulls can't be wrong.

[Nobbi1977]

Stock gearing seem ok on my two / three. 

[TurnipJF]

I too run a monsterised DT-03, using Mad Bull wheels and tyres, a 17t pinion, a 13.5t brushless motor and 2s LiPo. I have no thermal issues from motor or ESC, even on grass. Acceleration is no problem either - on high grip surfaces it can lift its nose and would probably flip on its back if one isn't careful with the throttle.

 

I think that such vehicles are coming into their own these days thanks to brushless motors, which typically prefer taller gearing than their brushed counterparts. With brushed technology, you would be quite restricted in terms of motors, as lower turn brushed motors want to rev higher and thus need lower gearing. In contrast, a 13.5t brushless doesn't rev much higher than a good Sport Tuned unless you fiddle with the timing, but develops far more torque, so is quite at home in a taller-geared vehicle.

[Saito2]

11 hours ago, iluvmud said:

Weird, never knew that the blitzer beelte and bear hawk have different gearing...... gear boxes are the same so I wonder how that was pulled off.

Yeah, I didn't know that either at first. BITD, TAMark or Kontemax studied the two gearboxes and found subtle gearing differences. You see it with the pinion choices. The Bearhawk runs 15T or 17T while the Blitzer runs 13T or 15T. 

The Madbull situation is odd. Tamiya went to the trouble of redoing the gearing for the Blitzer (which truck tires aren't all that big) but did nothing when making the Madbull out of the Mad Fighter. It helps the DT01 trans is very low drag, but those Lunchie tires are quite a bit bigger than buggy tires. That said, my Madbull silvercan gets warm while more powerful brushed motors tend to get downright hot in that chassis.

I think you guys are right. The brushless thing might be the key. Those earlier DT02 conversions were back before brushless got affordable.

[TurnipJF]

I think Tamiya may have thought Blitzer buyers to have more racing aspirations than Mad Bull buyers. They probably thought Blitzer buyers would want to fit faster motors so adjusted the gearing to suit. Mad Bulls on the other hand are great  bashers for kids of all ages, but have pretty much zero race potential. Tamiya therefore probably didn't see any point in making them suitable for faster motors.