So we just did the final assembly of our car. During the final alignment I noticed the rear wheels were migrating toward the car body instead of the axle head. Not cool. We used the silver bullet with a 3 degree cant. We also lightly inserted a decent set of axles and wheels after drilling to verify the wheel tracked the way they were supposed too and they were. Any ideas what might have changed? We didn't have to push the axles in real hard or anything. We don't have time to change it for the this race but we have one more in a week. So we want to see if we can fix it by then. Thanks!!
What just happened?
- Thread starter NeedforSpeed
- Start date
Could have warped. Are you using BSA axles? If so you may have a slight bend in them. Try turning the 180*. Do they still visually look canted the same? Also do you have the steer set? The wheels won't go to the head the same when it is steering in a curve. Do you have a meter stick or something to mimic the rail? If you do the roll test with a mock rail you can see how the rear wheels behave while the DFW is holding the line on the rail. If you still have problems switch the wheels and axles to the opposite side.
Like ngyoung said, change the wheels around on the car. Sometimes it works, sometimes it doesn't. Also, do the wheels migrate out in reverse?
I have a tuning board. I did have the steer set. I used a yard stick to mimic the rail and the wheels still go into the body when it is riding the rail. The wheels migrate to the head in reverse. I will move them around and see what happens. Thanks guys.
- Nov 24, 2011
- 3,903
- 30
- 48
- 13
- Nov 24, 2011
- 3,903
- 30
- 48
- 13
I drilled a block for a friend and when he painted the top and bottom it warped so bad the wheels had positive cant.
I think he also used the wrinkle paint. I did a second car for him and told him to glue in 1 row of cubes before painting.
He set the track record 2 times and won his derby.
I think he also used the wrinkle paint. I did a second car for him and told him to glue in 1 row of cubes before painting.
He set the track record 2 times and won his derby.
Get another baseline on what the rear wheels are doing. Remove the bent DFW axle, install a straight axle and roll the car again. The DFW may have a bit of influence on how the wheels migrate. I usually don't recheck wheel migration after checking it the first time (maybe this is why I can't find that extra bit of speed). Depending on how high or low, the DFW axle bend changes the nose height of the car. This can/will change rear axle toe, whether in or out. This could effect wheel migration. If the rear wheels are still moving in, you just may need to drill another block. You did say the wheels migrate out to the axle head in reverse, but not while moving forward, and this is what leads me to believe its a rear axle toe issue.
you could try taking some of the bend out of the front axle that would lower the car some and change the tow of the rear axle if you drilled your front axle hole to low it limits how much bend you can place on the front axle most guys here run a lot of bend but you must compensate with axle hieght
We must have done something wrong when we drilled using the silver bullet or the paint warped the body. We also cut our weight pockets after we cut the block so that could have done it. One of the rear axles looks towed in and the cant angles look a little different than each other. I'm not really sure of what happened all I know is I have to talk my son into building another car by Saturday. We got first in den, third overall with this car so thats pretty good for what we had to work with. Although my youngest son won the sibling race and had the fastest times overall with a car that has more problems than his brothers. So what do I know
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Thanks everyone
Thanks everyone
You wouldn't even believe how many blocks I've had to burn because I screwed up the drill job. I'm sure there's people on here that've done this longer than me that have A LOT more wood to burn than I do. It's part of the learning process and getting it right. You'll get there. Sadly there's nothing we can do for you on here with how to get the drill right. Make sure you have a fence setup when you drill so you can secure everything tight so your SB and wood don't move when you drill. Other than that, just try drilling a couple of junk blocks before your car to make sure you're dead on.
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