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Old 2009.11.15, 09:33 PM   #1
Traveler
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MR-02 ASF Unequal Turning Radius Left/Right

One of my ASF MR-02 exhibits this unusual behaviour. Any help is appreciated.

First, this particular chassis will not run straight with the steering trim centered. I must set my EX-I UR to R-2 to get the car to track straight. But what is more frustrating is that the left and right turning radius is different. The left turning radius is smaller than the right. This makes the car a lot better at turning left than right. Unfortunately at our track we run clockwise with more right turns.

Is this something that can be adjusted on the ASF board? If so, what do I need to do?

Thanks!
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Old 2009.11.15, 09:55 PM   #2
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my car is the same way .i have my steering balance set to left 67 right 98 trim r 2
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Old 2009.11.15, 10:17 PM   #3
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I don't know if this is a fix for your problem, but my car had the same issue. The left to right turning radius was way off. My right steering was fine but when turning to the left it had about half the radius of the right wheel. I was told by a local expert that I should replace the pot... I soldered in a new Kyosho pot and my problem was immediately fixed... I hope this helps..
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Old 2009.11.15, 10:23 PM   #4
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Did you try different tie rods???

Kris
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Old 2009.11.16, 05:27 AM   #5
Traveler
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Thanks for the responses guys! I've tried different tie rods to no avail.

The reason I asked about the board is because on the Gen1 XMODS boards you can adjust the steering pot with a screwdriver. I believe this is true for the MR-02 AM boards as well, but I never had to adjust any. Wondering if there is a screw adjustment on the ASF board for this.

I have a new pot laying around, but was going to see if there were other solutions before swapping that part out.
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Old 2009.11.16, 12:26 PM   #6
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Quote:
Originally Posted by Traveler View Post
Thanks for the responses guys! I've tried different tie rods to no avail.

The reason I asked about the board is because on the Gen1 XMODS boards you can adjust the steering pot with a screwdriver. I believe this is true for the MR-02 AM boards as well, but I never had to adjust any. Wondering if there is a screw adjustment on the ASF board for this.

I have a new pot laying around, but was going to see if there were other solutions before swapping that part out.
The AM boards have a small pot on the board that you can use to center the wheels. I am 99% sure ASF cars don't have this adjustment. See the photos in this post.

A bad or dirty POT could be causing your problem, but what are the end point adjustments set to? Did you try what B-main suggested?

Does your car make any funny noise when you turn the car all the way to the right?

-Jer
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Old 2009.11.16, 12:34 PM   #7
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Guess I'll have to take the servo assembly out and see what's going on. I don't see any adjustment point in the pics of the ASF board either. I don't want to live with the steering balance set to different left and right points to compensate as I'm not sure what if anything this will throw off. My goal is to make the thing go straight and have an equal L/R turning radius without any radio inputs.

Will post if I learn anything after taking it apart.

Thanks!
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Old 2009.11.16, 12:51 PM   #8
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it may not be the pot,maybe an extreme case of tweak.
check this out,

Quote:
Originally Posted by mk2kompressor

H-plates can cause the car to have tweak (any pan or touring car drivers worst nightmare) here is how to get the plate as flat as possible to the chassis.

unscrew the two long screws holding the H-plate to the chassis and remove the small oblong spacer.



take a look at the part of the chassis that spacer came from, you should see where the screws were tightened at the factory there will be small raised part around where the screw enters the hole.
this needs simply scraping off with a hobby knife so the mounting point is flat and the H-plate re fitting.



as you tighten the H-plate screws try and get them in as even as possible and be carefull not to overtighten them.
or maybe one of the front knuckles is binding
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Old 2009.11.16, 12:57 PM   #9
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Wish you were right. But when I turn the car over and turn the wheel on the TX from far right to far left, I can see that the front wheels don't turn as much to the right as to the left. And there is no servo motor noise at far right indicating that maybe the servo gears are jamming at that point.
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Old 2009.11.16, 01:32 PM   #10
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Answer to problem

Sounds to me like your board, pot and chassis are totally tweeked. Just since I am a nice guy I will give $10.00 for your junk.

Don't wast any more of time or money on this thing. All your after market aluminum parts are probably ruined as well because of mini-z tweekmosis.

I hate this has happened to you Traveler. I can sell you a brand new board and parts at a discount if you give me all your old hop ups.

They will cost you a lot more than here at the shop or anywhere for that matter. But have all been handled by Rodney, James, Wade and Pedro so you know they have to be good.

Send me a PM so we can get this deal done!
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Old 2009.11.16, 01:37 PM   #11
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But are you willing to make me a member of your racing franchise and change the name to MAWG???
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Old 2009.11.16, 02:31 PM   #12
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This probably won tbe it but eliminate the radio first. Maybe there is something wrong with it. Try reversing left and right and see if its still the same side that has less steering. If thats not the case its the radio.

GL
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Old 2009.11.17, 07:31 AM   #13
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Update - Still no fix

Got up early this morning and opened up the chassis hoping to find a chunk of RCP restricting the movement of the servo saver on one side. No such luck!

I removed the servo assembly and sprayed everything with some canned air to get any small particals out. Reassembled the chassis but problem remained.

I took it apart again and replaced the pot. Reassebled the chassis but problem remained.

I wanted to chunk the chassis at this point, but now I am on a mission. Next I will replace the servo gears. Didn't want to do that when I replaced the pot, because if it worked properly afterwards I wouldn't know which fix corrected the problem.
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Old 2009.11.17, 07:37 AM   #14
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Quote:
Originally Posted by Traveler View Post
Got up early this morning and opened up the chassis hoping to find a chunk of RCP restricting the movement of the servo saver on one side. No such luck!

I removed the servo assembly and sprayed everything with some canned air to get any small particals out. Reassembled the chassis but problem remained.

I took it apart again and replaced the pot. Reassebled the chassis but problem remained.

I wanted to chunk the chassis at this point, but now I am on a mission. Next I will replace the servo gears. Didn't want to do that when I replaced the pot, because if it worked properly afterwards I wouldn't know which fix corrected the problem.
Traveler did you make sure that the pot was centered if it is then it can be that you tweaked the front end try another chassis and make sure that you cables are all solder on the board. Also, check the plates and make sure that they are all holding on and that there is no play where the pot is on.
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Old 2009.11.17, 09:46 AM   #15
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I told you so!

Come on man, when are you ever going to start listening to me? Have I ever steered you wrong? No pun intended.

Just because you have more posts than me and have spent several thousand more dollars at this stuff doesn't mean you know more than me.

For the sake of all that as good give me your junk and be done with it! Even if you only made $10.00 an hour will all the time you have invested in this thing you could have already bought one of my overpriced, record setting, not to mention race winning setups.

Heck I might have even let you carry my gear into the shop this week.

Traveler if your ever going to be considered for MWGR your going to have to do a little better than this. Hopefully James hasn't stumbled upon any of this.
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