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Old 2001.12.10, 02:58 PM   #1
jagr
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different left and right steering characteristics

Hi all. I seem to have a problem with my steering. When I steer right and trottle on, my benz goes in a circle with radius of about 10cm. But when I do it on the right, it does a circle of about 30cm which is not good enough for me to make tight turns. I am using 25 degrees rear tyres and 20 degrees for the front. Other parts are modified 3 degrees knuckle, 1 deg toe in, rear suspension and damping, gpm differential gear. What could I adjust to make the turnings more balanced on both sides.
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Old 2001.12.10, 05:02 PM   #2
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I had this problem too, what I did was take the ESC cover off, and torwards the front / non-spur side of the board, there is a tiny pot-adjuster, if you put a screwdriver in and turn it, it is a front wheel adjustment, fool with that and your transmitter's steering trim until you get equal amounts of steering for each left & right.

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Old 2001.12.10, 07:16 PM   #3
Ken Mifune
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or just cut through the label. There's already an access hole in the cover.
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Old 2001.12.10, 07:29 PM   #4
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LOL man, I had no clue!! that's awesome

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Old 2001.12.10, 07:36 PM   #5
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Anyone that adjusts that,

Remember those type of adjustments are meant for VERY VERY VERY VERY small itty bitty less then a hair size changes... in some cases those pontentiometers can't even turn more then a quater turn, if you go beyond its extents it will break, just a warning, I think the one on the Z has a wider angle it can use though.

Basicly try to center yer controlers steering setting, and then use that to center your wheels... if you have to turn it more then 1 or 2 degrees, you probly did not center your servo gears on the servos internal sensor before reassmebling the servo, and its a good idea to get that centered first, but only if its been taken apart after the car was first purchased.

Just more common sense tips , to save a Z before its too late...
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Old 2001.12.11, 09:36 AM   #6
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if i adjust the pot on the board, wouldnt that be equivalent to adjusting my steering trim. cos right now, when my steering is straight, the wheels are aligned straight. if i am gonna adjust the steering trim to achieve balanced steering on both sides, my car wouldnt be able to go straight then.
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Old 2001.12.11, 10:05 AM   #7
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ken, you get the award for most observant. btw, do you ever gwt dirt or crap from the floor in there?
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Old 2001.12.11, 10:30 AM   #8
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it is sort of the same as adjusting your transmitter's steering trim, but you would only adjust the pot a tiny bit. I have no clue which way you turn it, it will be trial and error, but turn the pot, with the batteries in & power switch on, so you can see how much effect it has on the steering. Turn it one way, and then set the steering trim on your controller so the wheels are straight again (if your st. trim was centered before, it won't be now). Turn the wheels all the way left from the controller and see what angle they are at, then turn them all the way right, and check to see that the angles are close together. If it got worse, turn the pot back the other way, adjust your trim again, and check the angles again.

My problem was the same for the car as you're having, it would turn tighter one way than it would the other, but my steering trim wasn't centered on the transmitter when the car's wheels were to begin with, out of the box. In fact, it's still not, even after I adjusted it....but it turns equally to either side now that I adjusted the pot.

I hope this helps you out!!!
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Old 2001.12.11, 11:01 AM   #9
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well i once opened up the transmitter the fix a problem i had. after changing the steering wheel to some fanciful one, my tx couldnt steer properly anymore. it would turn the wheels all the way left and be stuck there even if u steered right. so i opened up the thing and adjusted the pots in there. i think you can even adjust the pot for the steering trim to be centered. but before you open anything up be very sure that you will be able to put it back together
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Old 2001.12.11, 01:52 PM   #10
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I realised that the problem was not due to steering but more to grip
When I drove my z in left and right circles at very slow speed, it is capable of making equally tight turns on both sides. But once I ran it at top speed, it is only able to make tight left turn but not a right turn. When going in circles on the right, it tends to slip out thus going round in a big circle.
Anyone faced a similar problem and solved it? I believe it has to do with adjusting the nuts on the wheels or something along the line.

Last edited by jagr; 2001.12.12 at 03:31 AM.
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Old 2001.12.12, 05:10 AM   #11
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just a reminder to those adjusting their steering to center... there are basically three ways that you can do it...

first option
- center the steering trim
- turn on controller
- turn on car
- take off the cover of your esc and look for the small dial on the
circuit board (in the attatchment it's marked "this")
- adjust the dial with a small screwdriver to center your steering

second option
if you're ok with having a hole on the esc cover you can put a hole in the sticker as suggested by ken... and perform the same steps in the first option.

third option
unscrew the steering wheel of your controller and take it out. remove the steering wheel as well... insert a small screwdriver in the hole where the screw holds the steering wheel in place, and you can center the wheels from there too (there's a small slot in there that does the same thing as the dial on the circuitboard)... make sure that the screwdriver will fit the slot...

hope this helps.... spread the word...
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Old 2001.12.12, 11:58 AM   #12
Ken Mifune
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I think it's worth it to just cut the hole in the label.
I had a piece of tape over the hole until I found a tiny pen with a plug on the end of it that fits pretty flush.
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Old 2001.12.12, 08:00 PM   #13
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Talking Steering Characteristics

I have seen and experienced this.
I attribute this to the standard differential fitted in Mini-Z racers combined with the left bias of the motor. Remember, the motor on Mini-Z racers is biased towards the left of the chassis.
Also, the standard nylon gear diff is way too loose and causes the Mini-Z to 'torque-steer' when traction is lost.
What I can suggest to get the Mizi-Z more balanced is to fit either a Kyosho or 3rd party Ball-Diff. If you cant source a 3rd party or Kyosho ball diff, another quick fix is to strip or dissasemble the standard diff and put some good quality lithium grease in the diff. make sure the grease isnt too light, hence it must be thick.

The grease shouldnt leak, as the Mini-Z diff foesnt get hot at all.

Some feeback on my suggestions would be appreicated )
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Old 2001.12.12, 10:08 PM   #14
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I was just about to put an ity bitty amount of Stealth Diff lube left over from one of my RC10T ('92 version) kits... since mine is realy noisy and rather sloppy and worn out (even though its hardly used in the living room, and only on a track for less then an hour).

I figure it will work ok... its nice white vasaline like lube wont be noticeable .

The sound of my Gear Box (and motor):

http://members.home.net/draconious/M...torLubless.wav
Now to try and get an AFTER sound for this BEFORE sound .


EDIT --

well an ity bity bit dont do **** hehe.
sounds a little better I guess... I would have to goop it in there, wich I dont want to do... now to work on motor lube... new thread
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