TC4 Issue
05-04-2010, 09:31 AM
#1
TC4 Issue
I have a TC4 with a Losi Excelorin 7500kv system in it. It always pulls to one side off the line and spins like mad to the left but not to the right. Can anyone tell my why??? Still, once it gets going, it's fast as hell!
05-04-2010, 09:49 AM
#2
Good day!
How is your side to side ballance and are the diffs in good shape? The TC4's do have a pull under power, it has to do with the fact that it is a drivshaft car. I ran on last year as my first car an had a blast. Also is your allinement corect?
How is your side to side ballance and are the diffs in good shape? The TC4's do have a pull under power, it has to do with the fact that it is a drivshaft car. I ran on last year as my first car an had a blast. Also is your allinement corect?
05-04-2010, 10:20 AM
#3
It's called torque steer. It is a vary common problem amongst shaft cars.
05-05-2010, 07:12 AM
#4
It's got a solid front axle, so I was thinking about loosening up the rear diff to make it "pull" more than "push" hoping that would eliminate the problem. I have heard about the shaft drive issue but didn't realize that it could be so bad. I'm gonna take the whole thing apart and clean and re-align everything, but with this much power I have a feeling that it's not gonna solve the problem, maybe just "lessen" it.
05-05-2010, 07:44 AM
#5
....
and you should see it when you have a "supercharger" profile on your esc.... my car handles just fine but now with some of these new profiles out when the motor winds out on the straight it give the car a bobble.... it all good if you ready for it
05-05-2010, 07:45 AM
#6
Tech Adept
iTrader: (1)
Hard hit
If you clamp the throttle from a dead stop with a high powered motor, the torque reaction will load up the right side of the car while unloading the left side. More traction on the right than on the left will make the car turn left.
Two choices: anticipate the torque steer and make a steering correction to the right. This may take some practice to get right. Or squeeeeeeze the throttle off the line to minimize the hard hit of the torque.
Two choices: anticipate the torque steer and make a steering correction to the right. This may take some practice to get right. Or squeeeeeeze the throttle off the line to minimize the hard hit of the torque.
05-05-2010, 07:48 AM
#7
If you clamp the throttle from a dead stop with a high powered motor, the torque reaction will load up the right side of the car while unloading the left side. More traction on the right than on the left will make the car turn left.
Two choices: anticipate the torque steer and make a steering correction to the right. This may take some practice to get right. Or squeeeeeeze the throttle off the line to minimize the hard hit of the torque.
Two choices: anticipate the torque steer and make a steering correction to the right. This may take some practice to get right. Or squeeeeeeze the throttle off the line to minimize the hard hit of the torque.
05-05-2010, 08:22 AM
#8
all good advice. thank you all! another thing I could do is reprogram the trottle curve on the esc and have it take off a bit slower. but the last time I tried that the esc seems to be a bit "off". that could be a problem with the program itself I think.
05-05-2010, 09:32 AM
#9
you could put some toe-in on the front to make the car track stright.
05-05-2010, 09:58 AM
#10
toe in??? I thought toe OUT in the front for straight tracking.
05-05-2010, 10:17 AM
#11
...
mine tracks just fine... and I kinda think yours does too.......It is just what was mentioned before.... with a shaft drive car there is torque steer... it just happens... honestly I wouldn't change your car... it is something you either have to live with or change to a belt drive car....
05-05-2010, 12:08 PM
#13
Toe-in forces the car's slip angle inwards, so the front of both left, and right tires are working against each other. And because the car's tires want to turn in on each other, this makes the car track stright. But this also makes the car want to push comming out of the corner. Normal car setups have toe-out in front and toe-in at the rear.
It could also be the car's steering linkage. I've noticed when I also had this problem, that there was a little play between the steering bellcranks and the steering bellcrank posts. I placed .010" shims under the steering bellcranks to remove some of that play.
It could also be the car's steering linkage. I've noticed when I also had this problem, that there was a little play between the steering bellcranks and the steering bellcrank posts. I placed .010" shims under the steering bellcranks to remove some of that play.
05-06-2010, 05:34 PM
#14
I'm going to go with checking droop also. I have a tc4 used for speed runs only and it drives straight. Now if the droop get off alittle then it will pull to one side.
05-07-2010, 01:03 AM
#15
make sure your shocks are of equal length and rebound too 
As others have said though, torque steer might be what is causing it though, that motor sounds pretty quick.
As others have said though, torque steer might be what is causing it though, that motor sounds pretty quick.