Tamiya Grasshopper - RC-Monster Forums

James · **Tamiya Grasshopper -** 10.13.2006, 05:35 PM

I have a tamiya grasshopper that i want to convert to brushless. Would the Castle Creations mamba proformance pack with 8 GP3700 cells work of if it to much of not enough power for it? Is it worth all the extra wieght and work to run 10 or 12 cells? About how fast will it go? Is it hte right batteries fot the motor?

captain harlock · 07:57 PM

Well, the mamba brushless setups might work with grass hopper very well, but it wont accept sub-c cells. The Mamba series are very small actually, even for the Grasshopper.

How about getting a 380 size feigao motor with a Mamba Max controller ( NOT Mamba controller- Maba esc is a mini size controller and Mamba Max is a 1/10 size controller)?

The owner of this forum and the whole site can make a very nice and satisfying offers for you, James. Check out with'em via e-mail.

monel_funkawitz · 10.13.2006, 09:40 PM

an esc does not care if the batteries are sub c, C, D, Q.

James · 10.14.2006, 09:27 AM

I have a MGM compro 80 esc and a wanderer 12s i used 2 times in a T2 i had for a year and didnt really like it. I had problems with gearing, and i described another problem i had with it to mike and he thinks it blew the BEC runing 12 cells. If i run less cells will it be more religable? Would that work with one of the 380 motors? Which one will go fsat, but not ruin the tranny?

10.14.2006, 03:46 PM

well if theres a problem with the bec on your computer just get a UBEC and use that instead should be ok on 12 cells then.

TBH the mgm controllers are not the best example of where sensorless technology is nowadays with the braking problems etc but those problems are probably fixed now in the latest software.

The grasshoppper is a very simple car and originally came with a 380 size motor i suspect that one of the purple can feigoa motors would fite nicely if you get low enough kv you could use a mamba 1/18th controller if you use a higher voltrage with low kv motor you could use cells smaller than subc for this or possibly lipo.

jhautz · 04:21 PM

Quote:

Originally Posted by James

I have a MGM compro 80 esc and a wanderer 12s i used 2 times in a T2 i had for a year and didnt really like it. I had problems with gearing, and i described another problem i had with it to mike and he thinks it blew the BEC runing 12 cells. If i run less cells will it be more religable? Would that work with one of the 380 motors? Which one will go fsat, but not ruin the tranny?

If you blew the BEC and everything else still works on the ESC you will need to run a rx pack or a UBEC to make it work.

Edit: whoops. was typing while chilledoutuk posted.....

captain harlock · 10.14.2006, 03:56 PM

Hmmm..I've never thought that a esc does not get damaged by using different battery sizes.

I should be more careful when I reply in the future.

James · 10.14.2006, 04:35 PM

Quote:

Originally Posted by chilledoutuk

well if theres a problem with the bec on your computer just get a UBEC and use that instead should be ok on 12 cells then.

TBH the mgm controllers are not the best example of where sensorless technology is nowadays with the braking problems etc but those problems are probably fixed now in the latest software.

The grasshoppper is a very simple car and originally came with a 380 size motor i suspect that one of the purple can feigoa motors would fite nicely if you get low enough kv you could use a mamba 1/18th controller if you use a higher voltrage with low kv motor you could use cells smaller than subc for this or possibly lipo.

I have the hornet but the tranny/axle housing is craked, so when i replace it i was going to ge tthe grasshopper one instead so i cna gun the mamba system. I can get the hornet part, and run a 540 size motor to. I have a could i run the wanderer 12s on 8 cells? would that have to much torq? how fast would it go?

jhautz · 10.14.2006, 04:41 PM

Quote:

Originally Posted by James

I have the hornet but the tranny/axle housing is craked, so when i replace it i was going to ge tthe grasshopper one instead so i cna gun the mamba system. I can get the hornet part, and run a 540 size motor to. I have a could i run the wanderer 12s on 8 cells? would that have to much torq? how fast would it go?

If you know the gear ratio you can use the speed calculator that BrianG put together.

http://scriptasylum.com/rc_speed.html

Without knowing all the particulars of your setup its hard to tell how fast it will go. Just plug in the info and it should tell you a pretty decent estimate anyway.

James · 10.15.2006, 08:20 PM

I have and old usless rustler, that i just took the rear end off of, made it about 3 1/2 - 4 inches norrower, and tomorrow im going to connect it to the chassis. I thought narrowing it would the the hard part, but i cant figure out how to connect it to the chassis.

I put the 12s in and on 8 cells it got up to 35, it didnt even have enough power to wheely, and striped the gears.

James · 10.18.2006, 11:07 PM

I tried programming my mgm 80 esc, and i held full throttle turned on esc, and nothing happend?
Also i have a 6 cell matched GP3300 , and 4 mached GP3700 can i mix them to gether to make 10 cells?

10.19.2006, 09:58 AM

james in a word "no"

Bassically due there different capacittys the 3300 would discharge first and then be reverse charge by the current from the 3700 cells thus killing the 3300 cells.

JOHN01374 · 03.30.2007, 02:31 PM

Guys I put a MM5700 in a grasshopper running IB4200's last weekend and it was a blast on sticky dirt/clay (can you say wheelstand) and simply ridiculess on concrete. Anything near full throttle and the car would spin out or standup and do this funky twist thing because only one tire was getting power. I ran about 6 packs through it and didn't hurt anything but the tires. Both are completly bald and the right rear has large tear. both where brand new out of the box before the 5700 :)

BrianG · 03.30.2007, 02:44 PM

John, how were the temps on the 5700? I would think that motor on such a light car wouldn't load the motor enough, but plan to use a 4600 on a CRT.5 and was wondering how hot it ran.

BTW: Welcome to the forums!

JOHN01374 · 04:25 PM

Brian,

I don't have a temp gun but I did the 5 second finger test several times during the runs and didn't have an issue. I let the car sit outside about five mins between packs and the motor never really got too hot to touch. The Battery pack did get pretty warm but I have LiPo's on the way. Some of the motor cooling might have to do with the design of the hopper. The body is completly open and the motor is pretty much hanging out in the breeze.