Tamiya Qds 46308 Clk Dtm (brushless)

[Justsidewayz]

I just pursched two Tamiya QDS 46308 CLK DTM. I am thinking of installing a Hobbywing 1/18th scale brushless system and a good radio. Do you guys think it can be done? Here is the link to the hobbywing product I am talking about. Click Here I belive this will work but I want your opinion first! Remember this is for fun. I have several 1/10 pro race and drift cars Losi, X-Ray, and higher end Tamiya's. Just want to race these with my nephew, and not have him kill my good cars. I have two spare fm radios for them. My cost on the two QDS's were $50 usd for both. Also I seen the Hobbywing brushless motor and esc on ebay for $50 usd shipped. These can handle up to 9cells. So I can still run the 9.6 volt packs. So all in all I would have $150 in two these 2 QDS's.

[Justsidewayz]

Also these brushless motors come in 5200kv and 7800kv which do you think I should use.

[TA-Mark]

5200Kv on 9.6v is ~49,000rpm. The 7800Kv even higher. It will make it move, at the expense of the pack as load would be massive.

Problem would be gearing. Being QD there is usually 1 pinion size and 1 motor position. A motor around 2000Kv->2500Kv would be more suitable to keep a similar rpm to the factory brushed motor. If you are not scared to modify to get the ratio lower it would work well.

[Justsidewayz]

Yea I do want them to go faster. I would have to use stock pinion so that gear mesh would line up. The 5200 would be my best bet. The QDS has a two speed transmission. As in you select either high or low. It would have to be in low gear all the time, as not to load motor and esc too much. Thanks for the quick reply. As well as letting me know what I am up against.

[wolfdogstinkus]

Hi, Justsidewayz you have caught my attention, I would be very interested to see how you get on with this, I have a MB QD project, and I am also looking for more speed.

Good luck with it and please keep us all updated!

My quick drive beetle

[TA-Mark]

MB QD I've done. Used a Castle Sidewinder Micro 4200Kv, almost bolted straight in, runs great and the system and 9.6v packs are all happy running on dirt/gravel (everything heats up on grass). I did fit a Futaba s3003 servo to it too.

Cheers, Mark

[wolfdogstinkus]

Thanks for the fast reply TA-Mark,

Is that motor the same dimensions as the one Justsidewayz has linked to?

And the QD gearbox handles it o.k?

[TA-Mark]

I've not used the EZ-Run systems so can't say for sure. They are both for 1:18 scale (Micro-RS4, X-Ray M-18 etc) so I would expect them to be the same can size, just different rpm/volt.

I wanted to put a 540 in the MB QD and I reckoned it would have handled it. The owner of the Beetle thought it was overkill and wanted the 1:18 size brushless. Has been running for quite a while in the hands of a 4yr old girl (my neice).

I use that 4200Kv Castle Micro motor in many of my 'toy' conversions.

[wolfdogstinkus]

I wanted to put a 540 in the MB QD

I was thinking the very same thing earlier, would need a smaller diameter shaft on motor though, or a different gear on the motor?

[Justsidewayz]

Wow I did not expect this much activity on this post, but hey I guess I stired up a lot of ideas. Thanks to all that have posted!

[wolfdogstinkus]

Wow I did not expect this much activity on this post, but hey I guess I stired up a lot of ideas. Thanks to all that have posted!

Hi, Justsidewayz, Sorry, didn't mean to hi-jack your thread,

I had my QD motor out last night and it is the same dimensions as the one you linked to, looks like it should fit,

Thanks very much for the link, and let us all know how you get on .

[Justsidewayz]

Well here we go. Last night I started in on the first QDS. First I removed motor, then rx/esc, then steering servo.

The motor pinion is a 8t. Getting the pinion off proved to be quite difficult. I used two straight screw drivers to pry it off. In the process i bent the end of the motor can out quite a bit, but it came off ok. I do not have my hobbywing EZ run setup yet. So I am kinda impatient so I removed my Tekin mini rage from my xray m18. This Tekin setup is a mini rage 6800kv. There specs say the motor is 20mm 180 size. This was smaller diameter than the original but not by much I would say maybe 4 to 6 mm smaller across. The motor has three different mounting positions luckily enough one set fit the plastic tabs that held the stock motor from spinning. The only thing is ti is a little longer than stock. I was able to put stock motor cover on just not able to screw down all the way. It does hold the motor in place quite well. I did not use the QDS aluminum motor cooling plates as they did not fit tight to the motor. I then used some green locktite on the motor shaft and pressed on pinion. Also while I had the gear case apart I re-lubed everything with some white lithium Greece.

I then moved on to the steering servo. I had a Futaba FP-S148 in the junk drawer. This servo had the same splines as the servo saver and was a perfect fit in the plastic tub. There was no modification needed at all.

I then installed my JR receiver, and mini rage esc in the stock electronics area. I glued the on off switch into stock location as it was not the same size as the stock one. Then ran ran wires into battery compartment. I also soldered the metal eye for the stock antenna I am using the metal wire aerial. I know it lengthened the antenna wire but it seems to work ok.

Ok testing I was only able to test in my apartment so no full speed runs yet. Hey every thing worked like a charm. Only thing was my stock 9.6v battery did not have enough punch left in it, and only made the esc and motor stutter because of the lack of power. I then tried my bran new 5 cell 1500mAh receiver pack. This worked like a charm. The car seems to be quite fast now, and I was able to spin up the rear tires in the linoleum in my kitchen. I will have to wait for some dry weather so I can do some full speed testing to check motor temps, and runtime. I would still like to get a new 9.6v pack. I found a good deal on a 2300mAh pack. Click Here

So good luck to all!

[Justsidewayz]

Well I ran my 5 cell 1500mAh receiver pack tonight. I got about 20min non stop run time. I used high and low gears. Mostly low gear. This car is fast now. I ran it hard the whole time and it was flawless. When I was done the motor was not even hot to the touch, actually it was cold. The outside temp was 50 degrees fahrenheit. I can not wait to get my new 9.6volt 2300mAh packs. The raido was a big help too. The steering and throttle responce on the car was so much smoother with my JR AM radio. I highly recommend this upgrade to anyone that has a Quick Drive Sport!

[TA-Mark]

One thing to remember with brushless in these 'toys' is the lack of gearbox bearings. If you don't give the poor things a cool down about every 20 minutes of runtime they will melt the locators for the gearbox shafts and bushings on axles. Same thing would happen in a 1:10 with a 540 brushless setup on plastic bushes.

[Justsidewayz]

Thanks I will have to install bearings on the axles. I was planning on that. I still am not too sure what to do with the gear shaft locator's. I guess just keep lots of grease on them and like your said let them cool. I will be racing with my nephew so I will keep the races to 5 min heats. Thanks for the advice.