3LikesRC12L3O That likes to spin around to the left under full throttle
01-19-2019, 09:15 AM
#1
RC12L3O That likes to spin around to the left under full throttle
Sorry if this is the wrong section but my problem is I have a RC12L3O Pan car that likes to spin around when I full throttle from any speed. I have foams on the front an rear, 30mm on the front and 50mm on the rear not sure on the shore the rear are bsr racing purple stripe and the front are yellow strip, hobby wing esc 2s or 3s Lipo, engine is a 17.5 t I believe not sure but it’s a Novak racing engine can’t find the exact engine anywhere. Think it’s a 540. Gearing is 38 teeth pinion, 93 teeth spur. Alignment is good checked everything, likes to spin around to the left every time I full throttle at any speed. I can fill throttle from dead stop it takes a second to wind up then it punches it then it does donuts. Thanks for any input. Also driving on asphalt
01-19-2019, 09:43 AM
#2
rebuild your diff and make sure its smooth, check your bearings escpecially in the rear axle
01-19-2019, 09:48 AM
#3
bearings on right side look good an are their suppose to be balls in the holes in the spur gear wasn’t sure so I jus made sure everything was like it was before I disassembled it, haven’t checked beatings on left rear tire
01-19-2019, 10:16 AM
#4
Sounds like the car is squatting asymmetrically when it accelerates hard. If there were bad bearings I would expect it to pull to one side constantly.
Put the chassis on a table so you can look at it edge-on, then compress the suspension all the way and release. Then lift the front of the chassis with the tip of a pen (or a really small hex driver) positioned along the centerline. If the right-front wheel lifts up first, add preload to the left-rear shock, and vice-versa. Then flip the car around and do the same test on the rear. If the right-rear wheel lifts up first, add preload to the left-front shock, and vice-versa. Do this a couple times until both axles lift off the ground symmetrically. This may not entirely solve the problem, but it should help significantly.
Put the chassis on a table so you can look at it edge-on, then compress the suspension all the way and release. Then lift the front of the chassis with the tip of a pen (or a really small hex driver) positioned along the centerline. If the right-front wheel lifts up first, add preload to the left-rear shock, and vice-versa. Then flip the car around and do the same test on the rear. If the right-rear wheel lifts up first, add preload to the left-front shock, and vice-versa. Do this a couple times until both axles lift off the ground symmetrically. This may not entirely solve the problem, but it should help significantly.
Last edited by fyrstormer; 01-19-2019 at 12:49 PM.
01-19-2019, 12:58 PM
#5
Tried that got everything even the right tire came up first when lifting and the left or right wheel did the same thing, had to add like 8 oz weights to get it even
01-20-2019, 02:31 AM
#9
It is a chassis designed to make left turns around an oval track 
01-20-2019, 03:49 PM
#10
Tech Adept
It’s a lto, so it needs good traction to accelerate in a straight line. If traction is poor it won’t go straight due to the huge % of left side weight. Also if you lift in the center the right rear should be 1/16 in the air before the left rear leaves the ground. It’s called wedge and helps the car work on the left turns. It should not be equal left to right.
We now run, 70-73% left side weight. If you turn right hard it may just roll over.
We now run, 70-73% left side weight. If you turn right hard it may just roll over.
01-20-2019, 07:57 PM
#11
Ah, I didn't realize the OP's car was specifically designed to turn left. Yeah, that does make a rather obvious difference in its configuration, not to mention it begs the question of why the OP bought it if he wasn't intending to drive it in the specific way it was designed for.
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
