losi 5ive-T conversion pics - Page 5 - RC-Monster Forums

auto2 · 04.29.2012, 09:23 PM

found a place to stretch the beasts legs. CORN FIELDS

nothing like cruizin at 60+ mph down a corn field ( without corn lol)
just dont roll over at the far end cause its a 5 minute walk to go get the thing.

i'm down to a 16t pinion with the castle blower fans and its running cool now.
no issues;no problems; just fun :-) i need tires.

brainanator · 03.13.2012, 10:53 PM

:D :D awesome!

03.15.2012, 07:28 AM

The motor looks tiny in that vehicle, guess if you have it geared wrong it will quickly damage the motor.

auto2 · 07:46 AM

i never thought 30,000 would diff out like that.:-) well guys what do you-all suggest? 50,000 and gear it for 55MPH ? i used brians speed calculator and without ballooning tires the 17 i have in it is geared for like 46 mph + or- and i doubt im going that fast on the straight? mike is sending me a 16 t to try and if that doesnt help its back up to 18T oh and BTW the 18 pinion is SICK! FAST. but full throttle from a dead stop was worse with the 18. from a slight roll it lifted the ft tires for a sec.

auto2 · 03.15.2012, 07:49 AM

"I've stated elsewhere about the heat generated through the use of a center diff that unloads quite often on my heavy vehicles. Mike countered that the sharp angles of the drive shafts are the reason for excessive heat. "

yes center diff front cup is 180 degrees. some of the gas guys that run for hours have actually got the dog bone blue from the heat. the rear cup was 150.

fastbaja5b · 03.14.2012, 01:53 AM

200f is too hot, something's not right there.

killajb · 03.14.2012, 07:27 PM

Quote:

200f is too hot, something's not right there.

My thoughts exactly, something's definitely not right much longer at 200f.. demagnetizing effect would ruin one's day I think..

auto2 · 03.14.2012, 09:16 PM

Quote:

Originally Posted by killajb

My thoughts exactly, something's definitely not right much longer at 200f.. demagnetizing effect would ruin one's day I think..

i changed the current limiter from 200 to 150 just before that run. could that cause the motor to heat up?how?

FG101C · 03.14.2012, 10:14 PM

It's diffing out to the front a lot. From my experience with brushless motors, this is just my experience, brushless motors like a load. Diffing out may be causing the motor to run with less of a load causing slight over revving. I fixed this same sort of issue in my 1/8th Truggy by going to a thicker center diff oil.

In my baja the 2028 was running hot, so I went up two teeth on the pinion and it coooled down some.

Again this is just from my experience, I'm by no means saying that's the problem with your truck or saying I'm an expert at this...end disclaimer.

auto2 · 06:56 AM

Quote:

Originally Posted by FG101C

It's diffing out to the front a lot. From my experience with brushless motors, this is just my experience, brushless motors like a load. Diffing out may be causing the motor to run with less of a load causing slight over revving. I fixed this same sort of issue in my 1/8th Truggy by going to a thicker center diff oil.

In my baja the 2028 was running hot, so I went up two teeth on the pinion and it coooled down some.

Again this is just from my experience, I'm by no means saying that's the problem with your truck or saying I'm an expert at this...end disclaimer.

i have 30000 dif oil in the center and its still diffing out lol
well this is interesting cause i though it would of run hotter on the street using a lot of brakes and basically dragracing over and over but it ran hotter on a dusty track with no real traction with a 17 pinion where i had an 18 on the street. i probablly didnt drive it for 12 minutes on the street though cause bashing gets boring to me real fast. plus it was 45-50 degrees during the street test and the track test was 70 degrees f

Bondonutz · 03.15.2012, 11:03 AM

Quote:

Originally Posted by FG101C

It's diffing out to the front a lot. From my experience with brushless motors, this is just my experience, brushless motors like a load. Diffing out may be causing the motor to run with less of a load causing slight over revving. I fixed this same sort of issue in my 1/8th Truggy by going to a thicker center diff oil.

In my baja the 2028 was running hot, so I went up two teeth on the pinion and it coooled down some.

Again this is just from my experience, I'm by no means saying that's the problem with your truck or saying I'm an expert at this...end disclaimer.

Diffing out def cause excessive heat, had the same probs with my EP buggys till the CD was running heavier fluids.
As if you hadn't heard it enough, 200* is excessive. With that much power to weight ratio you should be running 150-160* at the most. Gearing down may kill the fun a bit but def make a nicer/more managable drive and bring the heat way down.

My 2cents

auto2 · 03.15.2012, 11:20 AM

bondo i do know 200 is hot. thanks:-) only happened once. wont happen again. kinda suprised me. i did gear down. from 18 to17. is 45ish MPH too high for a track with 200 foot straight? maybe. that why i ordered a 16 from mike. but a few other people thought i need to gear up to give the motor some load. i do have 30,000 in the center. guess im going to 50,000?

Overdriven · 03.14.2012, 07:53 PM

Wow, thats a huge difference! You could almost make that triple into a quintuple if it weren't for the fact you couldn't slow down enough for the next turn! I see what you mean about the stocker not being able to turn enough though. Gotta love brushless, always enough power on tap to do whatever you want!

auto2 · 03.14.2012, 08:00 PM

i did make a quintuple plus a few feet and ended up in the next lane. if you play with it in the air you can get it to slow down and just land for the rt turn. i made it once out of 3 and decided to just do a quad lol

killajb · 12:26 AM

Quote:

i changed the current limiter from 200 to 150 just before that run. could that cause the motor to heat up?how?

Not exactly sure and there could be a few causes to reason.. FG101C may be on the right track regarding the center diff in general.

I've stated elsewhere about the heat generated through the use of a center diff that unloads quite often on my heavy vehicles. Mike countered that the sharp angles of the drive shafts are the reason for excessive heat.

In either case (or perhaps both combined), the motor mount transfers that heat as well. I'm sure that would contribute to overall high motor temps.

Patrick from Castle can chime in on the efficiency curve of the 2028. In my XBE for example, a 1520 runs cooler with the relatively tall stock gearing (~50mph) than a 1717 does. Hard to fathom at first, but then CC released info that the 1717 seems to "brick wall" after certain rpm's in terms of efficiency.

Regardless of the cause, I go for the lowest temps possible and 200f is pushing it. Sometimes a little trial and error is in order to find where things seem most comfortable.