Billet wheel Flex

[nc69rs]

How much flex have you guys seen during autocross of road course ? I did a autocross today and my wheels moved 3/4 inch to make contact with the coilover bracket.

[Mr Nick]

Is the picture showing metal shavings from the rim, or just scuffed rubber on the tire sidewall?

[nc69rs]

That's metal shavings were the rim made contact all the way around.

[oleyeller]

That begs the question... What wheels are you running?, what rear end?

[dontlifttoshift]

....and what did it rub on? Picture is unclear.

[nc69rs]

Budnik 18X12
12 bolt rear I measured 10-15 thousands end play per side
The wheel hit the lower coil over bracket.

[nc69rs]

Better pictures I hope, you can see in one where the tire was rubbing on the actual coilover.
I have now modified the bracket to avoid further contact with the rim.

[BlackHD]

What did you do to fix it?

[65 drop top]

Man, 3/4” of wheel flex sounds like a ton to me. Are you sure it’s not the coil over bracket that is flexing?

[oleyeller]

What tire and air pressure were you running. I can see the tire moving over, but the wheel? That just seems like a lot..... Mine is closer than yours but I have not leaned on it that hard yet,..... you have me interested in changing my lower shock mount.

[nc69rs]

I am running Rivals, 32 psi. I am surprised at the movement too, it seems excessive that's why I'm asking.
I thought with the bracket being steel if it moved that much it would bend.

[79T/Aman]

you have the wheel flexing in and the coil over pushes out on the bracket, so a little flex from both and "voila"

[egoman]

Does this car have a floater or a standard flanged or c-clip axles. If not a floater you can get a fair amount of movement with standard style rear ends. Combine the flex in several areas and that could explain your problems.

[nc69rs]

I am going to mount a GoPro for this weekends autocross and see what's going on.

[79T/Aman]

looks to be on a stock GM housing, cut yourself a 1/4" plate to go between the spring perch and the lower bracket plate, or an aluminum block to fill the void where the leaf spring was.

[nc69rs]

It is a stock housing. ridetech said they run the same setup with as little as 3/8 clearance and no rubbing.

[FlyDoc]

I want to see the go-pro video!

[AU Doc]

^^^^ What he said!