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View Full Version : Need Help. MR-02 Always Tweaked, Turning


Jace1283
2009.01.27, 10:58 PM
i have a mr02 that turns normal/understeers when turned right but when i switch left the rear end kicks out or spins out. its so bad that if i turn left i can do a donut within a rcp track. if i do that turning right it just hits the wall. ive shimmed the diff even, i've turned down the steering with the helios. i've replaced MM from 98 to 94 and new tplate and high force clamp, alloy castor mounts, no change. disk damper, chassis, kyosho diff have always been the same. the car has been like this since i got it, i can still remember it doing it back in the day when i was running enzo test car. I'm thinkin maybe i have to shim something but im still guessing. help would be much appreciated and if you need info/pics just lemme know. setting up rcp again track tomorrow so i can test. thanks!

car setup:
kyosho 30/20 f/r
94 mm 2.4 mr-02 w/helios
2.0 deg alloy knucks
pn springs, cups, stainless pins
pn alloy .5 deg castor kit
pn med plate
pn LCG mm 94mm
disk damper
kyosho oil shock
kyosho diff w/titanium shaft
SC430 body
pn stock 70t

actually already had some uploaded, pics:
http://pic70.picturetrail.com/VOL1841/8532638/21043684/352106551.jpg
http://pic70.picturetrail.com/VOL1841/8532638/21043684/352106353.jpg

color01
2009.01.27, 11:38 PM
Crappy tires? Binding bearings? Motor wire hitting the body? The SC430 is a pretty low shell and your motor wires are pretty "out there".

Try swapping left/right rear tires and see what happens? That sounds like a REALLY bad case of tweak, especially after you got an alu T-bar mount.

Rune
2009.01.28, 03:52 AM
Measure the distance on between tower bar and lower bar in the front. This should be the same on each side.

This is easy to get a little tweaked if you tighten one side first.

Check the front spring length. These should also be equal on each side.

Also switch the tires around as Color said.

When you have checked that the above is not the cause of the problem, you can start to shim your H plate. I typically use a thin plastic sheet on the motor mount side. The shim sets is to thick for me. I usually start with something around 0,03mm and go from there.

To get an idea of witch side you have to shim, place a 0,5 or 1 mm shim on one side, and see if the problem moves to the other side. Then you know witch side you have to adjust.

Another tip is to test without the body.

byebye
2009.01.28, 07:06 AM
Definately test without the body and see what happens.

Is there slight play from left to right on your diff? It could be too tight and may bind the bearing. Also put the diff in oppositely so it spins free of the motor and check the resistance.

Is the body bottoming out on the front tires?

Kris

EMU
2009.01.28, 07:48 AM
Check to see that the motor wire is rubbing the diff shaft. Also check that the diiff has a little lateral play in the motormount, and is not rubbing the bearings. Make sure that you have a good bearing in the right wheel and the wheel is not overtightened. Also try a new set of tires. Mini-z's tend to hook left because of the placement of the spur in the diff. Its typically push right/hook left.

JuniorWKR
2009.01.28, 09:02 AM
I used to run that body... the front tires hit the headlights.... ur gonna have to dremel them down from the inside...

MantisMMA
2009.01.28, 12:29 PM
also check for hair or any kind of material between the front bearings and the knuckles. o

color01
2009.01.28, 02:45 PM
Btw, are you running Kyosho 20 slicks in front? That would be a big no-no and an obvious cause for spinning out.

Jace1283
2009.01.28, 03:15 PM
sorry, tires are 30's up front 20's out back, kyoshos

this problem has occured to varying degrees on an enzo body, a 350z body(98mm), uhh the NSX only lasted a couple heats so not sure, and now the sc430 body. im guessing because of the 94mm with no offset that it is just more pronounced than it has been. will go with you guys' advice on this stuff, thank you. im finishing up the cleaning and will have my wide L setup soon, thanks

yasuji
2009.01.28, 03:52 PM
sorry, tires are 30's up front 20's out back, kyoshos

this problem has occured to varying degrees on an enzo body, a 350z body(98mm), uhh the NSX only lasted a couple heats so not sure, and now the sc430 body. im guessing because of the 94mm with no offset that it is just more pronounced than it has been. will go with you guys' advice on this stuff, thank you. im finishing up the cleaning and will have my wide L setup soon, thanks

looks like a metric yard of droop in the front.... that will give you tons of steering and roll... the sc430 body is verry low @ the rear tires.... check the clearance @ the rear wheels to the body

yasuji
2009.01.28, 03:55 PM
also check everything else that is mentioned above;)

boroEF
2009.01.29, 02:57 PM
check for a tweaked t plate, or slightly widened t plate fastening holes (on the chassis!).

It's not uncommon for the mounting holes on the chassis to enlarge with age/use, causing unwanted left/right rear plate on the t plate.

PN racing makes an aluminum spacer that solves this. Basically secures to the bottm of the chassis using 4 screws instead of 2.

this thing: pnracing . us / new / news_image / 20090104-171559-2 . jpg?r=57

remove spaces in url.

Jace1283
2009.01.29, 06:59 PM
yeah i already have that too, its the high clamp force tplate mount, car pretty much has it all.

i got my track up and the car wasn't tooo bad. i did notice a clean spot on the right rear fender so the wheel must have been rubbing at some point. im using the pn med plate. the axle is already on the highest setting, my sc430 sits real low on the rear, just an inherent thing about the body. i may need to give a stiffer t-plate a shot.

the problem im having now is keeping the rear end planted well and getting rid of some of the twitchiness during acceleration. i also was running a mostly glossy damper plate with light oil. i sanded down the plate along with the little black things so they have a dull finish and did all my testing dry. i got some oil and will be putting it on... i may also go a little stiffer in front to med springs

yasuji
2009.01.29, 07:17 PM
yeah i already have that too, its the high clamp force tplate mount, car pretty much has it all.

i got my track up and the car wasn't tooo bad. i did notice a clean spot on the right rear fender so the wheel must have been rubbing at some point. im using the pn med plate. the axle is already on the highest setting, my sc430 sits real low on the rear, just an inherent thing about the body. i may need to give a stiffer t-plate a shot.

the problem im having now is keeping the rear end planted well and getting rid of some of the twitchiness during acceleration. i also was running a mostly glossy t-plate with light oil. i sanded down the plate along with the little black things so they have a dull finish and did all my testing dry. i got some oil and will be putting it on... i may also go a little stiffer in front to med springs
did you try and reduce the amount of droop ??

Jace1283
2009.01.29, 08:28 PM
i put in medium springs (purple). my spring kit goes (soft)red/green/purple/white/yellow(hard). springs have a lot less droop up front. also since i put oil in the rear it's been stiffened up a tiny bit, putting a little harder springs in front toned the car down some. my steering range is now pretty even side to side, used to be very lopsided. car is making progress, im actually feeling pretty good about it. helios + 2.4 is a great help tuning

Mike Keely
2009.01.30, 09:57 PM
I always put super glue on the outside edges of all of the tires just to make sure that they are not starting to role over. Make sure you don't get it on the top of the tread part, just on the side. I use a razor knife to put it on.

Jace1283
2009.01.31, 11:06 AM
^ yeah ive done that but dont like the mess, i use tape. i need to get that grip lock stuff.

will be racing the car today so ill find out how its really running. i did shim the rear slightly between pod and plate

i also molded a soft lead plate under the whole nose, lol, j/k, i wish

yasuji
2009.01.31, 12:04 PM
i put in medium springs (purple). my spring kit goes (soft)red/green/purple/white/yellow(hard). springs have a lot less droop up front. also since i put oil in the rear it's been stiffened up a tiny bit, putting a little harder springs in front toned the car down some. my steering range is now pretty even side to side, used to be very lopsided. car is making progress, im actually feeling pretty good about it. helios + 2.4 is a great help tuning
just by the pics...the top and bottom bar that you have are both thinner than stock.... the top bar is slightly higher to compensate for the anti roll bar cups
and the bottom bar is lower than stk to run less preload @std spring lengths.....to me a good starting pointfor stock is 0mm droop for mod pancar .6mm droop

Jace1283
2009.02.01, 01:40 PM
So i finally found the problem, it was the differential. i hadn't really done any maintenance on it. we switched the diff for a known good working one and the problem was gone. i just took my diff apart and cleaned it real good, hopefully its enough to fix but i may have to get new diff balls and a gear. it was pretty gunked up inside with some sludge on the plates, lol.

now i need speed, i got the same motor as everyone else but theyre running faster lap times than i am. im pushing the car to the limit but i just can't get it to drive like i want. the problem is it kind of keeps rolling too easy so i cant get the steering i need. it just doesnt slow enough when i let off the gas so i can take turns tight, thats what it feels like. i really don't brake much as it usually just screws me up. i do have the brake setup so it doesnt spin hard or anything. its just that others aren't using brake a whole lot or at all, theyre car turns when they let off the gas. thanks for the help

EMU
2009.02.01, 03:57 PM
Does anyone you race with have the ICS connector? You need to remove the virtual inertia that the car has. I have noticed that some boards do it more than others. Removing the virtual inertia will give you more drag brake when you come off the throttle.

Jace1283
2009.02.01, 04:09 PM
no one has that yet, one guy was thinking of getting it but hasn't yet. honestly 2.4 has been nothing but a headache for me, i may end up selling my junk and just play xbox 360 online, lol

x_zminiracer
2009.02.05, 09:52 AM
............

Jace1283
2009.02.05, 04:58 PM
We just let off the gas earlier than you do J :D and on the monster you really need to use the brake...;)

haha D, none of your BS, my car really does roll too much, ive driven your cars and i remember how my am car was.

EMU
2009.02.05, 06:43 PM
What motor are you using?

Jace1283
2009.02.05, 07:20 PM
What motor are you using?

2009 pn stock 70t

EMU
2009.02.05, 08:30 PM
That motor has decent drag brake... so I am sure its the Virtual Inertia. On my Pan car with 09 PN 70t, I have a little VI, and want to get rid of it, but I dont have the ICS connector. I need to find one in stock.

x_zminiracer
2009.02.06, 02:07 PM
............

Jace1283
2009.02.06, 09:24 PM
I ain't BS ing ;) theys the facts, can't hep it if you don't want to hear it :D

So your saying my / our cars roll too much? Cause your using the same 2.4 factory set board we are. IDK what your talking about, with the new 70 motor my car don't roll at all? What's that clicking sound? :p J's radio!

i ordered the ics connector, dont bother asking me where i got it it was the last one. its my last chance or im going back to AM! or quitting, one or the other haha

D, i wouldnt talk unless you know what your talking about. have you driven my car? no, have i driven yours? yes, have i driven Ts? yes. do i remember what my am car drove like?, yes. have people on here said that some 2.4 boards roll easier than others? yes. basically what im saying is QUIET!!! lol. ive been right 3 times when you were against me so no more of your horse radish, see you on the track tomorrow lol
might want to read this: http://www.minizracer.com/forums/showthread.php?t=30867

dont you remember my enzo D, the thing was sideways in the corner it had so much brake and thats how i liked it, probly not as much now but my 2.4 is way on the other side of the spectrum.

x_zminiracer
2009.02.07, 08:13 AM
...........

dvsstrike
2009.02.07, 08:54 AM
D erase your previous post and stay out of his thread please