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angel7692
2012.01.06, 09:44 PM
Hey all,

I just got my first Mini-Z. It's an Enzo Ferrari MR-030 with a Perfex KT-18 transmitter.

I noticed that the wheel that's next to the large gear/differential (right wheel) tends to get more power than the other wheel (left wheel). If I tighten the bolts to where the manual says they should be tightened the left wheel doesn't get power. If I loosen the bolt I still find that the right wheel is the "preferred" wheel when it comes to distributing power from the motor. Is this the fault of the stock differential? Is my car defective?

That wheel power issue results in the car spinning out when I do more than 50% throttle. My mate just bought the MR-020 Ready Set and he is not experiencing any of these problems. He can go full throttle without spinning out. Both cars are stock.

Also I tend to hear a crackling noise (like electricity) coming from the car while it's not moving. What is that; a defect?

Thank you.

imxlr8ed
2012.01.06, 11:13 PM
The stock diff will put power down evenly as long as the tires have good traction. The variation in power you are now experiencing is either due to lack of traction or the left rear wheel nut is too tight. If it's a stock diff, make sure there is a little tiny bit of side to side play in the axle through the motor mount.

What surface are you running on and what tires do you have on?

The crackling noise is either the servo working to stay centered or if it's a bit of a whistling noise it could be the motor fets. Set the throttle trim until the noise disappears. I usually have my throttle trim set so the forward just starts to sing at the slightest forward trigger movement.

byebye
2012.01.07, 12:14 AM
What surface are you running on? What tires are you running? Is there any play in the differential from left to right?

Kris

angel7692
2012.01.07, 01:37 AM
I've been playing with the nuts and it's helped but it's not perfect. There is some play in the axel. On the flip-side my friend's Ready Set came with no play in the axel it works perfect.

I'm currently driving it on a wood floor with the stock tires. These tires appear to racing slicks as there are no grooves in them.

It's not the servo or the throttle trim. The crackle sounds like it's coming from above the batteries. It's as if the sound is coming from the logic board.

byebye
2012.01.07, 08:40 AM
The wood floor is too slick for your tires. Is there still craclinkg when the radio is on?

Kris

angel7692
2012.01.07, 11:08 AM
When I turn off the remote the crackling stops.

I don't think the floor is an issue as we have an Xmod and an MR-020 running with the same "****ty" tires and they don't have this issue.

rajiex
2012.01.07, 12:37 PM
When I turn off the remote the crackling stops.

I don't think the floor is an issue as we have an Xmod and an MR-020 running with the same "****ty" tires and they don't have this issue.

the crackling you hear is the servo motor or pot trying to center itself. The new 03 board are constantly trying to correct itself. I think this is a common noise with these boards. It shouldnt affect your steering.

angel7692
2012.01.07, 02:05 PM
You're right. The crackle does not affect the steering. I just found it odd to hear that noise. I guess that's the way all MR-030's are?

As for the differential. Under medium to high throttle in a straight line the rear of the car kicks out to the left. It just seems to prefer to give power to one tire.

If I tighten the nuts too much only the wheel next to the differential spins. If I drive it like that the rear end doesn't kick out but it doesn't seem right as the other wheel gets no power.

imxlr8ed
2012.01.07, 02:40 PM
Xmod tires may bite a bit better on a wood floor, if it's an AWD Xmod... well, that would explain the handling difference a bit more.

Mini-Zs have alot of punch... that power usually translates into tire spin on slick surfaces. They are usually better run on office type carpet, ozite or RCP track type sufaces to experience the full potential of the cars. If you're gonna race on wood floors it would be good to invest in some soft rear tires and maybe for the front as well. Softer tires on a wood floor will pick up dust and dirt instantly though so you may want to vaccuum or even mop a bit if you want it to stay consistent. The AWDs are a bit better suited to houshold surfaces like tile, wood and driveways... The 2WDs can run well on those too but you gotta have good throttle control.

Check the shop here for some tires... I'd recommend anywhere from a kyosho 20 to a PN 6 degree tire for the rears and anywhere from a kyosho 30 to a PN 10 degree for the fronts.

angel7692
2012.01.07, 04:59 PM
Normally I'd agree with you on the tires as that makes sense. When I see my friend's Mini-Z, with the same exact tires (we even did a tire swap and he still had no problem), not have this problem I'm inclined to think it's something else.

After a lot of testing I think my problem is coming from the differential. Do you have any differential trouble shooting tips? I've been adjusting the nuts on the wheels for hours and that won't fix my problem. Could it be a faulty internal differential component?

imxlr8ed
2012.01.07, 06:34 PM
Possibility with a binding in the stock diff. If you friends car is the same exact setup and his is handling on the same surface... And you've swapped tires... Maybe your H-plate is tweaked and the rear isn't getting the same loading on the rear tires. Flip the car over, minus the body, hold it level upside-down amd eyeball the rear tires and the front tires together. The tweak, if there is one, may be visible... May not be. All four tires should be on the same level. If the right or left rear appears to be sitting lower than the others, that may be your issue. Same goes for the front end as well, make sure there is no binding in the travel up front and make sure your springs are perched properly.

If the rear is tweaked, it xould be from the way it was shipped, or maybe the screws into the motor mount are not fully tightened evenly.

Tough little cars to tune but you'll figure them out eventually!

As far as the axle goes, as I said before... There should always be a tiny bit of side to side play in it... just a hairs width.

Hope all this helps.

imxlr8ed
2012.01.07, 06:40 PM
Oh, I used to pack my stock diffs with some grease to smooth them out a bit. Trouble shooting the diff... They should counter-rotate freely, with no binding. Swap diffs with your friend, see if it helps?

Make sure your front wheel nuts aren't too tight as well, on that surface... If you have a front wheel binding, it will certainly get you spinning out.

angel7692
2012.01.09, 03:55 PM
I don't see any tweaking

angel7692
2012.01.09, 04:00 PM
I don't see any tweaking. My friend is hesitant about swapping differentials so while that's a good idea I'll have to pass on it. What kind of grease would you reccomend. Is silicon spray good enough?

Kennon Hobby has a 20% restocking fee + shipping that I do no want to pay. I'd rather use that money for an upgraded differential. I could talk to Kyosho but I don't want to wait that long to have the car shipped overseas. I'm really leaned toward getting a new differential.

What differentials would you reccomend for an MR-03 Enzo Ferrari? It's going to be raced on an RCP track.

imxlr8ed
2012.01.09, 04:04 PM
Fresh out of ideas then, other than just to get some aftermarket tires, you'll see the car really handle then.

These cars are tough to troubleshoot, tough to see the real problems sometimes. You can chase your tail for a while before something simply overlooked turns up.

Wait, it's an Enzo body so this may not be it... are the front tires rubbing anywhere on the body? How about the rears?... they really shouldn't be but you never know.

byebye
2012.01.09, 04:22 PM
It's the surface you are running on. It's too slick. The mr-03's are lighter than the mr-02's. Is the mr-02 am or asf? The am cars only have two fets vs four on the mr-03 so the mr-03 naturally has more power.

Trying running a 9t pinion and add some weight to your car, maybe a quarter centered on the chassis. The dynamics of these cars take little to change.

Kris

angel7692
2012.01.09, 04:59 PM
The tires aren't rubbing. I did notice that the Enzo body doesn't let the rear suspension compress all of the way. The tire end up touching the body before the spring can compress.

My friend has an MR-02 2.4GHZ. It's a Murcielago body if that helps.

I really like your idea with the quarter; I'm going to give that a shot. As for tires what would you reccomend for wood floors? Perhaps something with treads?

color01
2012.01.09, 06:15 PM
Foam tires are the way to go for wooden floors. Bruce from O-Zone (dunchadoit on these forums, I believe) can hook you up with some specialized foams, otherwise X-Power is also selling premounted foams now but hard to find in the USA.

Good luck. :) Rubber rear tires are only good with plastic front tires on wooden floors -- you end up with a barely-controllable RWD drift car.

angel7692
2012.01.09, 07:44 PM
What makes the foam tires so good?

You said that rubber tires wouldn't work. Is that true even if the tires have grooves?

unearthed name
2012.01.09, 08:41 PM
simple, foam tires generally are more grippy then rubber tire. rubber tire pick dust on hard surfaces and it make them lose traction. the only thing i ever see running good on hard floor are awd (i miss my evo)

angel7692
2012.01.10, 08:38 AM
I think I understand. Foam tires provide maximum grip because they don't let the dust stick to them. Would foam tires be good on an RCP track?

Rune
2012.01.10, 09:05 AM
A few ears ago we had a painted MDF track.

On this surface the tire to use was GPM 25 shore.
These had so much grip that we had traction rolling problems.

We had to swab the surface before driving, but then it was sufficien grip for many hours.

If we used traction compund we even got higher grip levels. Window cleaner and Corally Jack The gripper was the two things that gave us best traction.

Foam tires also worked, but not as good as these tires.

byebye
2012.01.10, 09:14 AM
The tires aren't rubbing. I did notice that the Enzo body doesn't let the rear suspension compress all of the way. The tire end up touching the body before the spring can compress.

My friend has an MR-02 2.4GHZ. It's a Murcielago body if that helps.

I really like your idea with the quarter; I'm going to give that a shot. As for tires what would you reccomend for wood floors? Perhaps something with treads?

Dust sticks to slick rubber tires quickly even after thoroughly sweeping and mopping. Treaded tires would be a good option if you use your stock wheels. I have a set of foams but they don't work well for me on any surface other than rough concrete.

Kris