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Old 2015.01.30, 06:24 PM   #1
Jshwaa
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My First Mini-Z

OK, so I'm finally a Mini-Z owner. Just confirmed a purchase on eBay, for a "Kyosho MINI-Z MR-03S SAUBER Mercedes - KYO32207S-B" and an 8-pack of eneloop pro's.

Haven't even got it yet, but can anyone tell me what I'm undoubtedly going to want to purchase next(ie bearings, etc.)? I don't plan on doing as much 'driving' as much as dissecting it to analyze the electronics, but I would like to get the 'must have's' out of the way as soon as possible.

Thanks in advance.
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Old 2015.01.30, 07:26 PM   #2
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ball bearings. until you know what your racing on, hold off on tires. other than that, the LM runs fairly well right out of the box. you don't want to dump a lot of money into something that isn't going to provide the returns with little track time.
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Old 2015.01.30, 09:39 PM   #3
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Good to know, thanks.

Went ahead and got the Boca LBT ceramic hybrids. That should work, eh?

Last edited by Jshwaa; 2015.01.30 at 09:43 PM.
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Old 2015.01.31, 09:51 PM   #4
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any bearings would do... I'd throw in a carbon fiber t-plate, just in case the stock plastic plate breaks... and that's it...

When you start to get serious, there's a whole lot more to think about...

Welcome to the forums...
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Old 2015.02.01, 09:06 AM   #5
Jshwaa
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Quote:
Originally Posted by herman View Post
any bearings would do... I'd throw in a carbon fiber t-plate, just in case the stock plastic plate breaks... and that's it...

When you start to get serious, there's a whole lot more to think about...

Welcome to the forums...
Thanks, Herman.

Looking forward to sharing my thoughts when I get my wheels! Picked up some Si4562's from Digikey to hopefully make running a 32T survivable.

Would anyone suggest cramming 2 more cells (ie. 6-cell) in them, or is 4-cell good enough?
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Old 2015.02.01, 09:33 AM   #6
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if you want that kind of power, look into kyosho's Li-Fe cells.
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Old 2015.02.01, 11:44 AM   #7
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if you want that kind of power, look into kyosho's Li-Fe cells.
Cool! Will those drop in with minimal hardware modifications? I don't want to cut up anything if I don't have to. Thanks again.
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Old 2015.02.01, 03:18 PM   #8
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they plug in with a battery wire harness. no modifications necessary.
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Old 2015.02.01, 10:58 PM   #9
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they plug in with a battery wire harness. no modifications necessary.
OK, cool. I was just curious about the holders. I take it that the shape and volume of one of the Li-FE's is very close to 2xAAA's?
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Old 2015.02.02, 08:28 AM   #10
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I ve changed my tires. metal bearing. metal wheelnuts, and run for about 10 hours on the track in my local shop,

after 10 hours i broke my first thing that's the t plate, so i changed it to the x-power fiber t plate. i also changed FRONT STEERING KNUCKLE to 1 degree

I have every spend written in my excel file. I am trying to use every parts from the original as long as possible.

this is only my 4th month to own mini-z 03mm

and i am so addicited to it. whenever anything in my car goes wrong i will keep thinking it whole day.
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Old 2015.02.04, 07:26 PM   #11
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OK, so I got my mini-z....



Didn't even put batteries in it before I gutted it...

So, let me get this straight...



They actually provided a spot for 2 more FET's and just DIDN'T put them there??? LOL. Talk about marketing. How many mini-z's have been destroyed in the effort to put 2 FET's there, I wonder...

So, another question... Do people stack FET's on either side of the PCB(ie 6 FET's or greater), or does simply installing the extra 2 FET's in the empty slots (ie 4 FET's) provide enough drive for hot motors/Li-FE cells?

I bought a 10-pack of these bad boys...



However, I think there may be a new FET on the block...

Went perusing through Digikey's selection of FET's and found these...



They are a different package style, but this allows for a little more power dissipation.

I'm sure you've all heard of the almight Vishay Si4562. Pretty decent FET for use with mini-z's. Low Vgs, low Rds, and decent power dissipation (2W). Here is the Si4562 stats...



Here's the stats of the 'new' FET...



Si4562's dissipate 2W, while this new FET dissipates 2.3W. This is a marked difference, and should show itself in cooler running, and less thermal resistance when running hot motors. Haven't GOT them yet, but I ordered them right after I ordered the 4562's, and got the 4562's today, so they should be here tomorrow or next day. Plan to install 4 of those and a heat sink to one of the pairs.

Just wanted to check up and ask about the mysterious 'missing FET's'. I plan on losing tires here really soon!

Last edited by Jshwaa; 2015.02.04 at 07:33 PM.
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Old 2015.02.04, 07:31 PM   #12
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The standard 03 comes with 4 fets, two on bottom two on top. 8858 fairchild fets is the normal upgrade ones so you can use those for comparison for specs. I am not certain about this but I think that because it is a sport you only get two fets.
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Old 2015.02.04, 07:45 PM   #13
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The standard 03 comes with 4 fets, two on bottom two on top. 8858 fairchild fets is the normal upgrade ones so you can use those for comparison for specs. I am not certain about this but I think that because it is a sport you only get two fets.
Hmmm...interesting. So the ONLY difference is the number of FET's included? Why the heck would they not put 4 FET's on a MR-03S?? I feel like I bought an inferior mini-z now

Anyway, here's the specs for the 8858...



Looks like they are 'about' as good as the 4562's. They require a 10V Vgs to achieve the minimum resistance, which the mini-z does not provide. This is a stat many people overlook in their search for FET's, as they are only looking for a low R(ds) and a high I(d), not knowing that the FET requires a proper gate drive to achieve those parameters. And the 8858's are also 2W power dissipating...

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Old 2015.02.04, 08:38 PM   #14
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no the sport uses a different radio system and is not compatible with the higher end ko propo radios. It uses the cheaper flysky radio system which kyosho probably integrated with the esc unit previously used.
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Old 2015.02.05, 06:44 AM   #15
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no the sport uses a different radio system and is not compatible with the higher end ko propo radios. It uses the cheaper flysky radio system which kyosho probably integrated with the esc unit previously used.
So how do the differences between the ko-propo design and the 'flysky' system translate to the power end of the mini-z? Do they all run on the same FET circuit as far as the motor is concerned?

Does anyone know if installing the extra FET's on this MR-03S board will work? I did not take a close look to see if the locations are actually connected to power/signal for possible use. I will be upset if I can only use 2 FET's on this thing....
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