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I got up this morning and decided to take the Granite for a little backyard bash. My current set up is a Castle Mamba X ESC paired with a 1410-3800Kv motor running 3s. Gearing is 32p13/57. At one point I was running 17/57 gearing and was able to clock a top speed of 53 mph. The biggest problem I had was motor heat. I lowered the pinion to 13t with the hopes of lowering motor temps. In any event, this morning's session ended after about 12 minutes when the motor hit the temp limit (there was also some noticeable clicking coming from the front diff - more on that later). At this point I took it inside and downloaded the datalog.
The motor hit a max of 193.3 degrees and the Mamba-X hit 195. Just too hot. I went to Castle's website and looked up the 1410-3800Kv motor. Turns out they recommend 2-3s for 4wd vehicles weighing up to 4 pounds. 2s for 4WD vehicles weighing up to 6.5 pounds. So there is my issue. Granite is a 6.5 lb truck and the motor is not designed to run on 3s in vehicles weighing more than 4 lbs.
So off to the LHS to see what they had. After some debate I decided on a Castle 1512 2560Kv motor that can run 2-4s. I thought this was a good motor to run on 3s. I figured if I went back to the 17t pinion, performance would be close to the 13t on the smaller motor.
Swapping out the 1410-3800Kv motor and installing the 1512-2650Kv motor was pretty straight forward. I did have to take the Mamba-X off in order to fit the new motor. Future removals will require me to removed the top of the receiver box so I don't have to re-tape the ESC every time.
Now here was the first issue I ran in to. When I went to plug the motor leads into the ESC, they were way too big.
So back to the LHS for some new connectors and I was in business. I got everything buttoned up and I went out to test. Performance was nearly identical to what I had in the morning. Definitely more torque though. As I ran the truck through my bash area the clicking from the front diff got worse and worse. Eventually I was left with a RWD granite and with the amount of power I was pushing it was basically undriveable. I took it inside to check out the front diff and to check the data log. Max motor temp was 153 and max ESC temp was 173 degrees. I was pleased. Now for the diff:
I thought it was going to be missing teeth on the ring gear but instead it was melted teeth on the input gear.I had a broken input gear laying around so I quickly moddded it up with a wheel axle and I was back in business. So back out I go and 8 minutes later I was FRONT wheel drive only. I was already running a modded rear input shaft so I was baffled. Back behing the wall I go. I pull out the rear diff and this is what I find:
I never liked how close the hole for the pin was to the end of the plastic. So much for that. I made a new hole farther back in what appeared to be a solid piece if the plastic shaft and threw it back together. I went outside to test and it lasted 3 minutes. Of course no one has AR310802 in stock. I was able to find someone selling complete diffs in EBAY (brand new). Of course I don't need the entire diff and it's twice the price, but you gotta do what you gotta do.
So long story short, I really like what little I got to test of the 1512-2850 motor. It should give me the performance I am looking for on 3s while maintaining reasonable motor temps. My only concern is whether the amount of torque from the motor will be too much for the driveline. I really would like metal diffs!
The motor hit a max of 193.3 degrees and the Mamba-X hit 195. Just too hot. I went to Castle's website and looked up the 1410-3800Kv motor. Turns out they recommend 2-3s for 4wd vehicles weighing up to 4 pounds. 2s for 4WD vehicles weighing up to 6.5 pounds. So there is my issue. Granite is a 6.5 lb truck and the motor is not designed to run on 3s in vehicles weighing more than 4 lbs.
So off to the LHS to see what they had. After some debate I decided on a Castle 1512 2560Kv motor that can run 2-4s. I thought this was a good motor to run on 3s. I figured if I went back to the 17t pinion, performance would be close to the 13t on the smaller motor.
Swapping out the 1410-3800Kv motor and installing the 1512-2650Kv motor was pretty straight forward. I did have to take the Mamba-X off in order to fit the new motor. Future removals will require me to removed the top of the receiver box so I don't have to re-tape the ESC every time.
Now here was the first issue I ran in to. When I went to plug the motor leads into the ESC, they were way too big.
So back to the LHS for some new connectors and I was in business. I got everything buttoned up and I went out to test. Performance was nearly identical to what I had in the morning. Definitely more torque though. As I ran the truck through my bash area the clicking from the front diff got worse and worse. Eventually I was left with a RWD granite and with the amount of power I was pushing it was basically undriveable. I took it inside to check out the front diff and to check the data log. Max motor temp was 153 and max ESC temp was 173 degrees. I was pleased. Now for the diff:
I thought it was going to be missing teeth on the ring gear but instead it was melted teeth on the input gear.I had a broken input gear laying around so I quickly moddded it up with a wheel axle and I was back in business. So back out I go and 8 minutes later I was FRONT wheel drive only. I was already running a modded rear input shaft so I was baffled. Back behing the wall I go. I pull out the rear diff and this is what I find:
I never liked how close the hole for the pin was to the end of the plastic. So much for that. I made a new hole farther back in what appeared to be a solid piece if the plastic shaft and threw it back together. I went outside to test and it lasted 3 minutes. Of course no one has AR310802 in stock. I was able to find someone selling complete diffs in EBAY (brand new). Of course I don't need the entire diff and it's twice the price, but you gotta do what you gotta do.
So long story short, I really like what little I got to test of the 1512-2850 motor. It should give me the performance I am looking for on 3s while maintaining reasonable motor temps. My only concern is whether the amount of torque from the motor will be too much for the driveline. I really would like metal diffs!