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Model Forum / Radio Controlled / Land Models / July 2003ntc3 spinning while braking
My ntc3 always spins fast under braking, always 180 degrees. It started happining about a month ago and I've exhausted all means as to figuring out what is causing it. I've never had a car that has done this, my brother's ntc3 is fine, even under heavy braking with all wheels locked up. My neighbor's hpi is fine too. Here is what I've done so far: * Checked alignment: Tried 0, 1, and 2 degree toe for the rear * tried 0, 1, 2 degrees toe in and out for the front in different combinations * tried different camber angles, * replace all the bearings, * cleaned out diff and put back together * different levels of tightening on the diffs * new wheels and tires, different combinations of wheels and tires, * checked for play in suspension, * rebuilt cvds After all this the car will still quickly pull a 180 to the right, and sometimes to the left. Any suggestions? Jay Borrow an MIP Tweak Station and see if your spring preload is all equal. You might have uneven pressure on one of the tires. The other thing to look at is binding in the diffs and axles (bearings).  SignatureJustin Mahn remove Panties to reply > My ntc3 always spins fast under braking, always 180 degrees. It started > happining about a month ago and I've exhausted all means as to figuring out [quoted text clipped - 17 lines] > > Jay What kind of tires are you using? Foam or Rubber? I use Foam Tires on my NTC3. My Rear has 3 degree toe-in. Suspension spring is stock, Shock oil weight is 40wt all around. I give like 6 mm droop for my rear end. Front is 5mm. If you find my setup still bad, then I would suggest that you REBUILD the car from Step 1 of your Instruction manual. That's what I did to my Serpent Impulse and finally found that the arms are bent. *duh!* By the way, do you have a One-Way or Solid Axle somewhere in your NTC3? Alfie > Borrow an MIP Tweak Station and see if your spring preload is all equal. > You might have uneven pressure on one of the tires. The other thing to look [quoted text clipped - 26 lines] > > > > Jay I haven't gone to step 1 but I have redone the whole drivetrain and suspension. I also still have the standard ball diffs and arms are perfect with no excess play. > What kind of tires are you using? Foam or Rubber? > [quoted text clipped - 43 lines] > > > > > > Jay I had this "180 Spin" when I was driving my Serpent as I have mentioned earlier. It has a something to do with the droop and suspension. There's nothing much with the diff, because if your diffs are loosen out, it will only make your car handle better and not much top speed. The pressure plates will be the one suffering from the Diff balls causing all that friction. Try to use a new set of tires (foam ones) and you should know the problems. Alfie > I haven't gone to step 1 but I have redone the whole drivetrain and > suspension. I also still have the standard ball diffs and arms are perfect [quoted text clipped - 51 lines] > > > > > > > > Jay > My ntc3 always spins fast under braking, always 180 degrees. It started > happining about a month ago and I've exhausted all means as to figuring out Try moving your left shocks to the right side, and the right shocks to the left side. See if it changes the direction that it spins. If so, check your shock oil and shock pistons to make sure they are all the same, or the same on each side. Make sure rear diff is not looser than front diff (and slipping). Try dialing out the brakes a little bit do they dont *completely* lock when you hit them (you may have already done this). Let us know what fixes it just in case someone else has the same problem... Thanks -tom I'm still working on it. I'm getting the diff rebuild kits to change out the bearings and friction disks for the front and rear diffs. I tried the brake thing but it leaves me with long brake distances. I will let the board know when I fix this. Thanks for the ideas though. > > My ntc3 always spins fast under braking, always 180 degrees. It started > > happining about a month ago and I've exhausted all means as to figuring [quoted text clipped - 13 lines] > Thanks > -tom I replaced the worn drive rings and carbide balls in the ball diff. No more steering and braking issues and fixed what I thought was a permanently slipping clutch. Apparently one of my diffs wasn't getting the power down to the ground. My car was either front wheel drive or rear wheel drive (if I switch the diffs front and back). > I'm still working on it. I'm getting the diff rebuild kits to change out > the bearings and friction disks for the front and rear diffs. I tried the [quoted text clipped - 22 lines] > > Thanks > > -tom > I replaced the worn drive rings and carbide balls in the ball diff. No more > steering and braking issues and fixed what I thought was a permanently > slipping clutch. Apparently one of my diffs wasn't getting the power down > to the ground. My car was either front wheel drive or rear wheel drive (if > I switch the diffs front and back). Jay, thanks for the update. -tom I think that this can be caused by several things. 1) one of the wheel bearings is worn out. This has caused me to spin out under power and not breaking, though. 2) the car will spin out if you have the front and rear tires switched around (ie harder tires in the rear and softer tires in the front). the same thing can be happening if you have the springs reversed, also. I have only seen racing done with harder springs and tires in the front. tim >> My ntc3 always spins fast under braking, always 180 degrees. It started >> happining about a month ago and I've exhausted all means as to figuring [quoted text clipped - 13 lines] >Thanks >-tom |
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