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Old 03-14-2022, 06:59 PM   #1
DrZiplok
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Default Waited too long for Ben's QSRCs to be ready...

... should have replaced the balljoints on schedule. Oops.

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Old 03-14-2022, 07:34 PM   #2
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How in the world does that happen twice? The Rally guys don’t even have ball joint failures.
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Old 03-14-2022, 07:47 PM   #3
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How in the world does that happen twice? The Rally guys don’t even have ball joint failures.
The first time it happened turning left. Next day it happened turning right.

I guess we turn and stop fairly hard, and we do it a lot, plus a fair bit of kerb-hopping? ABS + Delrin bushings probably combine to add a lot of shock loading.
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Old 03-14-2022, 07:55 PM   #4
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It amazing how consistently they failed. Id suggest avoiding Meyle balls joints and stick to lemforder.

Next batch of QSRC should drop tomorrow FYI
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Old 03-14-2022, 07:56 PM   #5
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How in the world does that happen twice? The Rally guys don’t even have ball joint failures.
These guys break EVERYTHING.

They are the John Lane of 2022
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Old 03-14-2022, 08:25 PM   #6
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Originally Posted by 2manyturbos View Post
How in the world does that happen twice? The Rally guys don’t even have ball joint failures.
Seriously this. Never experienced a front ball joint failure, except that one time the strut broke off the car.

I replace the lower ball joints when there's play, which is probably what's kept this from becoming an issue.

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The first time it happened turning left. Next day it happened turning right.

I guess we turn and stop fairly hard, and we do it a lot, plus a fair bit of kerb-hopping? ABS + Delrin bushings probably combine to add a lot of shock loading.
I'd love to run the numbers the braking, turns, and curb smashes that happen per lap, and then how many laps to failure. I bet it's pretty darn high.
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Old 03-14-2022, 08:29 PM   #7
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Originally Posted by blkaplan View Post
Next batch of QSRC should drop tomorrow FYI
Oh really. You should update me on you know what.
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Old 03-14-2022, 09:39 PM   #8
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Originally Posted by culberro View Post
I replace the lower ball joints when there's play, which is probably what's kept this from becoming an issue.
There's no play in these, they're still tight.

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I'd love to run the numbers the braking, turns, and curb smashes that happen per lap, and then how many laps to failure. I bet it's pretty darn high.
Obviously different tracks have different ratios, but some ballpark numbers:

~14 track hours per race
~2 minutes between kerb hits (VERY approximate)
~10s between corners at our usual tracks
~6 races per year
~2 years since these were installed

So on the order of a thousand kerb hits across ~170 hours on track, and ~10,000 stop/turn events.

Here's a lap from Sonoma a few minutes after the second balljoint replacement.

https://www.youtube.com/watch?v=5Nq1CgnYdnc

Brandon is perhaps more kerb-hungry than other drivers on the team...

Last edited by DrZiplok; 03-14-2022 at 09:49 PM..
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Old 03-15-2022, 01:38 AM   #9
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Default Camber ?

How much camber do you run?
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Old 03-15-2022, 10:34 AM   #10
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Dang i was wondering why you guys were down. 2yrs is a lot i guess with the engine you run. Its probably heavier im sure.
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Old 03-15-2022, 11:18 AM   #11
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I bet it is from the bus stop. I think that is where one of the bolts that holds the ball joint to strut broke on me last race.

https://youtu.be/NVFhf6LBBSI?t=171
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Old 03-15-2022, 01:46 PM   #12
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Was this bernal dads racing?
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Old 03-15-2022, 03:01 PM   #13
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Was this bernal dads racing?
DrZiplok is BDR, my video is not BDR
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Old 03-15-2022, 11:55 PM   #14
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How much camber do you run?
Last time I measured it was a bit over 3°. We aren't super scientific on our setup; tire wear suggests we could probably use a bit more on the working side, but that would require longer control arm extensions, and we are lazy...
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Old 03-16-2022, 01:03 AM   #15
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Originally Posted by DrZiplok View Post
Last time I measured it was a bit over 3°. We aren't super scientific on our setup; tire wear suggests we could probably use a bit more on the working side, but that would require longer control arm extensions, and we are lazy...
That should be fine unless something goes into full bind and the weak link will break, have fun!
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