wollow86

iTrader: (7)

Hi guys. I participated in my first on road race yesterday, and am happy to say i had an absolute blast!

One slight problem though. The car was great at the start of the race, but towards the end the back end would be come loose. Both under breaks and on power through the slower corners, after a long and a small straight.

When i got the car home, and took off the wheels (i was using pre-glued sorex 36r with the schumacher wheels they come on) both rear wheels had this:

Right Rear


Left Rear


what can I change to prevent this?

KoE

iTrader: (6)

i'm not an expert but it seems to me that your wheels were scrubbing against something; loose hingepin? grub screw?

wollow86

iTrader: (7)

Heres what they are rubbing against, any ideas on how to stop it?

rosko

Looks like it could b hitting the top of the ballcup. I would suggest using open faced ballcups like the ones for the team losi type r sedan. When I had a schumacher back in the day the ballstuds were bigger than losi and associated so u migjt have to get different ballstuds also.

BrodieMan

iTrader: (3)

you might be able to shave a bit of material off the top of the ball cup. doesn't look like it would take much to stop the ballcup from touching. with the two rings on your rims, your ball cup might have been getting stuck in those two grooves momentarily and causing some weird handling.

rc_square24

iTrader: (9)

Attach the wheel and visually confirm where they are rubbing when they spin.

I may be wrong but doesn't look like the ball cup is very scratched up.

If not the top link it can also be the spacing of the hub carrier in relation to the lower arm. If too forward or aft the lower arm will rub the wheel. Move the spacers around the hinge pin to adjust clearance (the shorter, outboard pin).

As mentioned if its the ball joint cup then just shave off material until it doesn't rub.

wollow86

iTrader: (7)

You were right rc_square. It's actually rubbing underneath on the arm. All I could see to change on the car was the height that the lower arm sits on the hub carrier. I adjusted that, and seems to have corrected the problem, but also added 2mm to the rear ride height. I've adjusted the preloading on the front springs to even out the ride height a bit. I'll take it to the track and see how it handles when I can. But I guess I can take some of the preloading on the shocks off if it feels funny. I'm still very new to all this so I have alot more to gain from practice rather then setup tweaks, so it shouldn't matter to much.

rc_square24

iTrader: (9)

There is a plastic spacer/washer between the carrier and the lower arm visible on the 2nd picture of your car. Can also try moving that to the other side of carrier.

wollow86

iTrader: (7)

Marks are on both sides of the arm. What effect would moving that spacer have normally?

Foxxrocket

It could also be rim diameter. Had the same issue with my TA05. The front end ballcups where rubbing against the inside rims. I went with a tire that had more internal space, and that fixed the problem.

wollow86

iTrader: (7)

Any recommendations?

defcone

iTrader: (15)

Just get a file and shave off some of the ballcup on the top.

Foxxrocket

Well, I will tell you to avoid using Speedminds. Those were the tires that caused the problem. I switched to Sorex and Much More tires. But it's best to find out how much space the the arm takes up before you go and blow money on new tires.

Skiddins

I would remove that spacer, looks like a 2mm, and replace it with 2off 1mm spacers, one each side of the carrier, this will make the wheel more central on the carrier.

Skiddins

rc_square24

iTrader: (9)

Hmm, its weird that both sides of the arm is scratched. When you check it with the wheel on does it look like there is not enough clearance on both ends of the arm? If so then youre right moving that spacer wont change anything so switching to the middle hole may be best. I see there are three holes for the carrier and on the lowest one (as in pic) it may cause the arm to be too close to the inside of wheel.

What does the tire have anything to do with this? Do you guys mean the wheel?

Maybe you can post a pic with the wheel on the car so we get a view of how it looks like when installed.