The was a water cooled electric 1/8 onroad car featured in an rc car action magazine, and guess how much it weighed...

...13 or 14lb. Of course it was made by Chris Fine.

No kidding. But then again, he's probably using Feigaos (or his mysterious "XLT" motors) geared to the moon so no wonder. For the same weight (and probably price), he could have gotten a Neu 1515 or maybe even a 1521 and not have to worry about it.

Bottom line: Dihydrogen Monoxide cooling is good for: bragging rights, to do something different, or to make your setup look "techy" with all the doo-dads running everywhere.

watercooling
 

I had a 61mm extended Lst2 around 15 lbs due to 8k 6S lipo and 1527 1D motor and a 40 ser big joe tires. I had a +9 pinion with a 6S and I guess it was a bit much on the high side for the Hydra 240 to handle. After 7 min
it went up in flames. It was running real good before the mishap. It will
wheely up even though my batts are in front and I extended it also in front
to avoid wheelies. My motor and ESC stayed cool till the ESC started smoking and flames started coming out. Less gearing and I think it will be fine. I was running it with a 5S and it ran good. I guess the 1527 1D eats too much amps for the ESC to handle. Do you think the MGM 22418 will take my setup better? I know I have to gear it down when I get it back up and running.
My setup ran real cool, I checked the waterflowing with a temp gun and it drops about 40 degrees before it goes back to my water tank.

rotfl more or less right :rofl::lol::rofl::lol:

1527 1D is a 2300kv motor, you shouldnt be running it on anything more than 4s lipo. For 6s lipo a 1527 1.5D would be more than enough, though a 1521 1Y would be great also. Getting the setup correct (motor/Kv/voltage/esc) is critical- boat and plane escs arent designed to handle the high current surges from a standstill or when you punch the throttle whilst moving- MGM would be much more suitable, though the MMM can handle the 1521 and 1527 also it seems...

+1 to what Suicideneil suggested

The nitro motor you replaced in your lst2 was revving between 30000-35000rpm at max under load. This is also the ideal rpm range for a BL motor and will give you plenty of gearing options to adapt your motor to different driving conditions. Crazy fast with bigger pinions and better controlable + more likely to behave like a nitro motor with smaller pinions. With no need to use those ultra small pinions below 12t.

A 1521/1Y (1577kv) @ 22,2V (6s) would rev at 35000rpm and is a perfect fit. Your 1527/1D (2300kv) @ 22.2V might have hit 51000rpm. Your 9t pinion indicates that it was impossible to gear it apropriatly. Even with 5s it will rev @ 42500rpm. Still not easy to gear as it will require very small pinions and a powerfull ESC. At 2300kv it would be a better fit with 4s lipo, but this would demand very high Amps to get some decent power for your heavy truck: 2000-2500 Watt -> 150-200A @ 4s. I guess the MGM 224 is your best bet or maybe the MMM if it really can provide a 200A surge current.

watercooling
 

My extended Lst2 was running a 34/63 gears, stock is 25/63. It's just too much load from excessive gear that is why I fried two ESC. Now I know how to be conservative as I spent way too much on ESC. I made a flat chassis 2" extended Lst2, I'll be putting the 1527 1D or 80mm 2K Medusa(when it arrives).I'll be running a OFNA spider 53 spur 13? It should be weigh 14lbs hopefully or lower. I'm sure this would handle better with the lower
center of gravity.