LOSI 8T 10S Rocket........... - Page 3 - RC-Monster Forums

speedracer1129 · 12.03.2008, 09:22 AM

Quote:

Originally Posted by killajb

Speedracer,

Where do you run? I am in Ft. Lauderdale and would like to bring my speed projects out for testing..

killajb,

We are running in different areas. Either at FIU on 8street in Miami on Wednesdays or 12th ave in Carol City on Wednesday nights and Sundays after 3pm. We will be at 12 ave tonight as the street is much longer and wider than FIU. In all honesty, I do not think I will run at FIU with this car as the calculated speed based on previous testing for this car won't allow me to run it there.....

You should definately go out as you will see alot of different vehicles!! I will PM my number so you can call me if you have any other questions.

Luis

jzemaxx · 12.03.2008, 10:38 AM

Quote:

Originally Posted by Takedown

You might set a record with this. I think jzemaxx's record was 81mph with his MMT on 12s. Weve got to see a video of this thing in action.

I was on HPI rubber Phaltlines. Foamy's are not allowed per the rules. The foam's I would have gone WAY faster. Problem is I ran into the limit of the tires....not the truck.

speedracer1129 · 12.03.2008, 03:10 PM

Quote:

Originally Posted by jzemaxx

I was on HPI rubber Phaltlines. Foamy's are not allowed per the rules. The foam's I would have gone WAY faster. Problem is I ran into the limit of the tires....not the truck.

Yes, the Phaltlines are no good for anything above 75-80. I put a set of new ones at 76 and they ripped off in 2 passes!! I heard IMEX is coming out with a MT foam tire similiar to what JACO made for the Tmaxxs a few years ago...

speedracer1129 · **Round 2 -** 12.04.2008, 10:23 AM

Good Morning Guys,

DISASTER!!! The motor I purchased was apparently no good!! I had purchased a used motor from someone on another forum and it seems to have had problems. Before I left my house I ran the truck with the wheels off the ground on 5S for about 5 minutes pulling throttle on/off at about 1/8-1/4 throttle. I noticed the motor got to about 170ish with no load! I assumed it may have been because of no load on the motor. Well...............

got to the spot, prepped the truck and was able to run it for about 10 seconds. It took off from where I was fine. I made one pass at about 1/4 throttle to make sure everything sounded ok and it did. Brought it back to line it up again and when it got to the end to turn it back around it wouldn't move!!! When I got it back to the table you could smell the heat coming from the motor and it temped at about 220 at that point! I am going to try to contact Neu and see what they say as well as the guy who sold it to me as it was supposed to be an "almost new" motor.......

OH WELL

I think I am going to try a Medusa until I sort this out so this will be out of commision for a little while.............

sleebus.jones · 12.04.2008, 11:18 AM

Ewww. Sorry to hear about your bad luck. It's getting so used brushless is about as much of a gamble as used nitro nowadays. =/

killajb · 12.04.2008, 01:35 PM

I agree.. A few weeks ago I purchased a used Lehner with supposedly "10 hrs" of runtime on it. Well, when the motor arrived one of the bullet connectors fell off after I removed the heatshrink! I was changing the bullets anyway to match my ESC, but that was a sure sign of foul play. In addition, the leads were all discolored and when I finally attempted to run it, the thing smoked~

I purshased my 1515 2.5D new and it's flawless. I purchased a 1515 2D new from TeknoRC and first ran it with 6S and an 18-tooth pinion on my Hyper 8. I only ran down the street, turned around and hauled back but the motor was getting pretty warm so I shut it off. I've since switched to 4S and a 14-tooth pinion, perfect temps and ideal for track use anyway.

I don't think I'll ever buy a used brushless motor again for fear that someone else will just ignore caution and beat the crap out of it.

TDC57 · 12.04.2008, 02:39 PM

VIDEO!?? where is the video ???

P.S.
Looks like a great project..

speedracer1129 · 12.04.2008, 02:59 PM

Quote:

Originally Posted by killajb

I agree.. A few weeks ago I purchased a used Lehner with supposedly "10 hrs" of runtime on it. Well, when the motor arrived one of the bullet connectors fell off after I removed the heatshrink! I was changing the bullets anyway to match my ESC, but that was a sure sign of foul play. In addition, the leads were all discolored and when I finally attempted to run it, the thing smoked~

I purshased my 1515 2.5D new and it's flawless. I purchased a 1515 2D new from TeknoRC and first ran it with 6S and an 18-tooth pinion on my Hyper 8. I only ran down the street, turned around and hauled back but the motor was getting pretty warm so I shut it off. I've since switched to 4S and a 14-tooth pinion, perfect temps and ideal for track use anyway.

I don't think I'll ever buy a used brushless motor again for fear that someone else will just ignore caution and beat the crap out of it.

I agree, no more used stuff!! I am pretty picky about my stuff and I would feel bad if I was on the other end! I have spoken to a few companys already about the situation and they all seem to be on the same page that something happened to the motor before I got it. It seems that the a magnet came loose and rubbed against the can.

Oh well, I already spoke to Medusa and I am going to throw in a 80mm 1600kv when they come in.

jhautz · 12.04.2008, 08:05 PM

So you dont think that running the motor at its rpm limit and haveing the Center dif gears get chewed up when the dif bearing failed could have put any stress on the motor bearings? Seems pretty coincidental to me that the motor failed the next time you ran it. I wouldn't blame the guy you bought it from or the motor itself. Anything will break if you push it to its rpm limit and then add additional stress of chewing up gears. Thats the price you pay for pushing things to their bleeding edge IMO. You would have probably ruined a brand new motor doing that too.

speedracer1129 · 12.04.2008, 09:00 PM

Quote:

Originally Posted by jhautz

So you dont think that running the motor at its rpm limit and haveing the Center dif gears get chewed up when the dif bearing failed could have put any stress on the motor bearings? Seems pretty coincidental to me that the motor failed the next time you ran it. I wouldn't blame the guy you bought it from or the motor itself. Anything will break if you push it to its rpm limit and then add additional stress of chewing up gears. Thats the price you pay for pushing things to their bleeding edge IMO. You would have probably ruined a brand new motor doing that too.

j,

I understand what you mean but here is the thing. I have confirmed with both Medusa and Neu on my situation yesterday. Both of them stated that the setup was not the problem. I am not pushing the motor to it's "limit". The motor is rated at 60k continuous use max, not it's absolute max. On paper, the setup pushes slightly over 60k, but in the truck it will only about 45-50 so I am in no danger as far as that is concerned. The fact when I tested the motor with the wheels off the ground I was getting high heat already. Funny thing is that I got 2 different answers on that. Medusa said it was possible that the motor would get to those temps in that scenario. Neu told me that that was happening because a magnet was already rubbing in the can due to something from before. They both did say that it seems that the motor failed due to a magnet or magnets becoming loose and rubbing internally which caused the failure once it tried to pull the weight of the truck. Lastly, the center diff gears don't exist in this truck....In other words, this truck has a custom solid spool that uses a plastic spur gear on it...that is it! If you are picturing a bunch of chewed up metal, that is not what happened. If it was, we wouldn't be having this conversation!!

jzemaxx · 12.04.2008, 09:25 PM

Neu's will go well over 60K rpms. Umm my 1521 1.5D is 1900KV. I'm running 12S on it.....do the RPM math ;)

12.04.2008, 09:30 PM

you buy a used motor from me... come on here post your wonderful setup then when you run the motor over what its max rpm is and after you run it for more then 30 seconds in your paypal claim you want your money back......

you ran 1 run you had the carrier fail that would cause an abrupt shock on it and damage the bearings in the motor. i should not be responsible for you not running the motor within its specs. i ra the motor on 5s without any issues.

speedracer1129 · 12.04.2008, 09:31 PM

Quote:

Originally Posted by jzemaxx

Neu's will go well over 60K rpms. Umm my 1521 1.5D is 1900KV. I'm running 12S on it.....do the RPM math ;)

Ok, Jzemaxx I do have a question for you. Does your 1521 have the same motor mount spacing as a 1515?? That is the motor I originally wanted to run but I was under the impression that the 1521s had a different spacing for the mount?

speedracer1129 · 12.04.2008, 09:41 PM

Quote:

Originally Posted by cheesecake

you buy a used motor from me... come on here post your wonderful setup then when you run the motor over what its max rpm is and after you run it for more then 30 seconds in your paypal claim you want your money back......

you ran 1 run you had the carrier fail that would cause an abrupt shock on it and damage the bearings in the motor. i should not be responsible for you not running the motor within its specs. i ra the motor on 5s without any issues.

The motor was never ran out of it's specs to start. As previously stated, the motor was already giving problems on 5S and with no load so that says something. I may have made the mistake to have intended to run it after seeing that happen, but I had no reason to think there was any problem with the motor.

12.04.2008, 09:48 PM

there was nothing wrong with the motor when i sent it and your abuse on it should not make me responsible.