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View Full Version : What motor for an MR-03 Sports?


drewbagel423
2015.03.16, 08:19 PM
I'm looking to upgrade from the stock MR-03 sports motor. I've noticed a lot of the PN motors say they're incompatible with the sports chassis. I'm ok with installing new FETs as well as required.

Solo1
2015.03.16, 08:28 PM
The problem with the pn motors in the S is they wont mount in the rear pod you have to buy a pn rear pod of some sort. I'm running a pn 70 t in a lcg4 pn rear pod and have no problem with stock fets. Have also read here that you should be able to go to a 50 t with no fet upgrade but again you will probably need a new rear pod. And all this depends on you not nosing the car into something and spinning the tires for a while which is what i believe is the simplest way to burn out the fets.:D

drewbagel423
2015.03.16, 08:37 PM
You mean these two?
http://www.insidelinehobbies.com/p/6949250/pn-racing-mini-z-mr0203-98-102mm-v4-lcg-motor-mount-blue.html
http://www.kenonhobby.com/PN-Racing-Mini-Z-PNWC-70-Turn-Offcial-Stock-Motor_p_43044.html

Can't believe the pod is almost 4x the price of the motor.

EDIT: Do you also have an S, btw?

cowboysir
2015.03.16, 09:31 PM
I don't understand what he means by "motors not fitting" but the plastic motor pod should be able to hold a typical 130 motor since there's no size difference between them and a stock mr03s motor. You can geta motor pod but it's not really needed

DMALMAD
2015.03.16, 09:40 PM
honestly i would just go with a kyosho x-speed motor.

Solo1
2015.03.16, 11:05 PM
I have 2 sports mini z's and the pn motor does not fit properly in the stock pod (at least i couldn't get it in right) and in my opinion a 70 t is faster than an x speed though a x speed is faster than stock. I like the 70 t as it brakes more(stronger magnets?) than stock or an x speed

DMALMAD
2015.03.16, 11:58 PM
If you are going to be racing then get the 70t and buy a motor pod (PN LCG V4) and also get a dps set too while you are at it. Then if you are going that far also look into a ball diff and 64p pinions. Seems like a lot but that is really bare bones. But really it depends on the class you are racing in. If you are racing at your local track see if they run a 70t class otherwise if you are running in your basement for fun stick with the stock motor and gear it up or go to an x-speed.

ilove599xx
2015.03.17, 01:41 AM
i am using x speed, but can I install the R246 motor in my mr03 sports in the future?

Jshwaa
2015.03.17, 08:55 AM
I couldn't change my motor in my stock mr-03s motor mount without breaking 'something' on it. So fragile....

Best bet is to purchase a PN mount, in my opinion...

I really like this one. "Kyosho Mini Z LM Aluminum Motor Mount (MR-015/02/03) - KYOR246-1202"

http://i83.photobucket.com/albums/j314/Jshwaa/Mini-Z/DSCN2327.jpg (http://s83.photobucket.com/user/Jshwaa/media/Mini-Z/DSCN2327.jpg.html)

Haven't had an issue with it yet...

drewbagel423
2015.03.17, 01:13 PM
Thanks for all the responses. I assume if I don't need to upgrade the FETs for the 70t then I don't need to for the x-motor either?

mleemor60
2015.03.17, 01:35 PM
I would certainly think not. The X-Speed should be just fine and will add additional speed but will lack torque so a smaller pinion is indicated to keep unwanted heat from building up in the motor and electronics. The eyelets on the X-Speed should also be compact enough to not cause issues. If you select the PN 70 then you will gain some torque but loose top end. A larger pinion can be used but staying around 11/53 is good for most all but the most stupidly large tracks. When you attach the motor leads just be careful not to interfere with the small capacitor that is concealed between the screw mount holes. The PN motors have a significantly larger eyelet so use caution. Most of the PN motors have a rather crude crimp around the pinion shaft bushing which can impede the fitment of the stock motor spacers. A little sanding on the inside of the spacer or some filing on the motor boss can correct it. Just be careful. If you get the 70 to fit properly it will be a great little workhorse for you. if you run them long enough to replace the brushes you will gain significant performance advantages. The older they get the better they run without doing any of the things that people do to supposedly make them faster. The looser they get the better they run.

Jshwaa
2015.03.17, 01:41 PM
I would certainly think not. The X-Speed should be just fine and will add additional speed but will lack torque so a smaller pinion is indicated to keep unwanted heat from building up in the motor and electronics. The eyelets on the X-Speed should also be compact enough to not cause issues. If you select the PN 70 then you will gain some torque but loose top end. A larger pinion can be used but staying around 11/53 is good for most all but the most stupidly large tracks. When you attach the motor leads just be careful not to interfere with the small capacitor that is concealed between the screw mount holes. The PN motors have a significantly larger eyelet so use caution. Most of the PN motors have a rather crude crimp around the pinion shaft bushing which can impede the fitment of the stock motor spacers. A little sanding on the inside of the spacer or some filing on the motor boss can correct it. Just be careful. If you get the 70 to fit properly it will be a great little workhorse for you. if you run them long enough to replace the brushes you will gain significant performance advantages. The older they get the better they run without doing any of the things that people do to supposedly make them faster. The looser they get the better they run.

Just an off the wall question about the PN motors... why does the PN 70T come with a bushing can, but the 32T, 43T, etc. all come in bearing cans? Are bearing cans not allowed in a 70T race?

DMALMAD
2015.03.17, 03:46 PM
Probably to keep costs down because at most events 70t is used as a handout which could get very expensive if you are talking about a 20$ handout motor:eek:

KWT
2015.03.17, 04:40 PM
Do not get the LM motor pod unless you have a LM body. You will also need a LM diff or diff shaft.

drewbagel423
2015.03.17, 04:57 PM
Do not get the LM motor pod unless you have a LM body. You will also need a LM diff or diff shaft.

How do I tell which body I have? I think it's either MM or RM.

DMALMAD
2015.03.17, 06:00 PM
LM bodies look like actual Le Mans cars. What body do you have? If your stock motor pod has the motor in front of the axle (nearer to the chassis) it is either lm (102) or mm (98). If your motor pod has the motor above the axle or behind the axle then it is either HM (86 or 90) or rm (94). The numbers refer to wheelbase in milimeters.

drewbagel423
2015.03.17, 06:22 PM
Lambo Murcielao SV

It actually says MM/LM on the underside

mleemor60
2015.03.17, 06:54 PM
Lambo is 98mm.

mleemor60
2015.03.17, 07:22 PM
Just an off the wall question about the PN motors... why does the PN 70T come with a bushing can, but the 32T, 43T, etc. all come in bearing cans? Are bearing cans not allowed in a 70T race?

You can get a bushed 50T which is a decent entry motor for carpet where rolling resistance is higher but early on the 70T was the entry level motor and was used for "stock" competition at all PN events and was soon adopted as the go to motor for base competitions around the World. As I mentioned earlier the older they get the faster they get right up til the bushings wear out. You can routinely find them cranking out 32-35,000 RPM's on their second or third set of brushes with minimal "comm" maintenance. PN then brought out the 80T for the entry motor so to speak but they were significantly slower than the 70T but they did have a little more torque so you could add teeth to get the speed up. We recently tested one at 4.8V and it put out a whopping 18,167 RPM. When we jumped it up to 7.4V for use in an MRX it instantly jumped to 38,000 plus while remaining very tractable. The PN bearing motors are decent pieces for competition and remain the standard for the scale. I love the 70T but there are, in my opinion, superior motors out there but they remain to be less accessible. Now with the advent of brushless motors development will likely stop on the brushed units. Currently the brushless motors with single pole armatures lack adequate drag brake capabilities. Once we have good access to multi pole rotors that too will change. Though weak at best, you can get some brake action out of the mono pole motors with careful board settings plus utilizing some of the more advanced menu settings in the more modern radios. On the plus side, reverse is less necessary since the car will roll back far enough after an impact that you can usually just drive off kind of like we used to di it in the 80's in 1/12th scale when reverse wasn't allowed.

You are coming in at an interesting time so keep up what you are doing.

DMALMAD
2015.03.17, 08:51 PM
Yea personally I really like the feel of the atomic round can motors but gave up on them because they weren't avialable locally. As for the brushless, we recently tried a 1/18th speed control with an atomic sensorless motor and it had enough drag break to almost make the car do a complete stop!!!:eek: Yes the motors leave a lot to be desired but mainly I think the drag break issue was the result of poor quality esc on Kyosho's part. Anyways sorry for the sidetrack:o

drewbagel423
2015.03.18, 12:16 AM
So being that I have an MM, what is the correct part number motor mount?

mleemor60
2015.03.18, 06:41 AM
MR2289 is the part number for the 98-102 LCG V4 motor pod. there are others but this timeless design remains the most trouble free motor pod out there for the 98mm or 102mm chassis.

drewbagel423
2015.03.18, 11:01 AM
I looked up the X-speed motor, and it seems there are three different part numbers it's listed under. Any idea what the difference is?
MZW8P
MDW023
MDW002P

mleemor60
2015.03.18, 04:48 PM
There have been variations for RWD and AWD. The third I don't know and I'm no longer sure which is which. I have a couple at home. When i return tomorrow i will check and advise.

doug01n
2015.03.27, 11:47 AM
FETs are different from 03 to 03S... I wouldn't go with 70T. PN prints that is not compatible, and we already 3 or 4 burned boards here in Brazil using the 70T in sports. If you insist, start with 6T and go not beyond 8T standard pinion, measuring the temperature of board and motor to avoid damage.

drewbagel423
2015.03.27, 05:33 PM
Great, another wrench in the works. Anybody have any idea what FETs are compatible with the sports board?

KWT
2015.03.27, 11:54 PM
Great, another wrench in the works. Anybody have any idea what FETs are compatible with the sports board?

They both use the same replacement FET type. The sport board only has 2 FETs install with the pads for 2 more while the MR03 ASF has 4 FETs installed.

drewbagel423
2015.03.27, 11:59 PM
So the 8858s will still work on the sports board?

Even though only two spots are populated, are the unused pads still connected to the appropriate signals? In other words, can I populate those spots to get 4 FETs on the board?

mleemor60
2015.03.28, 07:23 AM
Replacing the fets with 8858's and adding the second pair will open up the board for use with virtually any motor. The gains will be most noticeable with the slower type motors such as the 70T and 80T offerings from PN. The more powerful motors will become far less manageable because of the available power increase from the fet installation. Don't be surprised if you have to start minimizing throttle high point's to use the extra power and, or even going to weaker batteries to get back the level of control you might be used to. At least until you get used to the change.

drewbagel423
2015.03.28, 11:06 AM
Would you recommend only replacing the two FETs then. Not all four? I was just thinking along the lines of having the most headroom as possible to not fry the board by using an aftermarket motor. I only plan on using the PN 70T or the X-speed.

stefano225
2015.03.28, 12:22 PM
Regarding using the Xspeed I can state there is no problem with stock fets , been using it for the past week or so with out any issues.My current set up is X speed on a r 246 aluminum motor mount and 64 pitch pn diff 54/10.I can run for hours motor doesn't even get warm.I don't race , homemade track in the basement 14ft 6ft nothing big but fun to play around:)

drewbagel423
2015.03.28, 12:24 PM
Which x-speed part number are you using?

stefano225
2015.03.28, 12:29 PM
I will look it up when I get home and post the item number.

stefano225
2015.03.28, 12:38 PM
MZW8P it's the one listed under options on the Kyosho site parts list for the MR03 asf , I remember calling awhile ago and asked tech support for compatability with sports MR03 and was told that it was OK to use it.

drewbagel423
2015.03.28, 01:49 PM
Thanks, stefano.

KWT
2015.03.28, 11:36 PM
MZW-301 is the correct part number for MR03 ASF x-speed.

drewbagel423
2015.03.28, 11:58 PM
I started disassembling my sports to see how difficult it would be to install more FETs. There are four wires of various colors coming off the front and three black towards the back of the board. Would I be better off de-soldering those wires first?

Solo1
2015.03.29, 08:34 AM
I replaced 1 fet in my sports with a pn 1 as i burned out reverse i think with a dropped screw when working on the car or possibly by not first trimming the eye on the wire of a pn 70t on install and the car has been working fine since, have probably 3000 laps on car. When i replaced the fet i just removed board from car flipped it over and held it above car with 2 alligator clips without removing those wires and soldered in new fet. car works fine with 1 pn fet and 1 stock fet.

drewbagel423
2015.03.29, 10:13 AM
Looking at the board I see three parts which look like FETs, in addition to the two open spots. I wonder if I'd just be better off installing two new FETs and not messing with those other parts that may or may not be FETs.

stefano225
2015.03.29, 10:25 AM
This thread might help http://mini-zracer.com/forums/showthread.php?t=40232

drewbagel423
2015.03.29, 10:38 AM
Thanks. I PM'd dmald because his one message was kinda confusing, at least to me.

Solo1
2015.03.29, 11:18 AM
pic of burned fet

http://i613.photobucket.com/albums/tt215/huckleberry800/20150123-_MG_4565_zpsdac67da7.jpg (http://s613.photobucket.com/user/huckleberry800/media/20150123-_MG_4565_zpsdac67da7.jpg.html)