to anyone running the VAC tie rods. This failure was at the glen. Just a reminder to inspect critical components. No evidence to suggest that there is anything wrong with the VAC product, but that failure could have ended much worse!
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This is why we take pre-event Tech inspection at a shop - seriously. -
Aluminum?
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I agree with the importance of tech, but I'm curious if there was even any visible indicator of this before it failed.Originally posted by Estoril View PostComment
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So if it wasn't the fault of the tie rod then what was the reason for the fault?2003.5 MT JB/B - CSL SCHRICK SUPERSPRINT EISENMANN JRZ SWIFT MILLWAY APR ENDLESS BBS/SSR DREXLER KMP SACHS RECARO AR SLON MKRS GSP DMG KARBONIUS CP AUTOSOLUTIONS KOYOComment
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I'm not inferring there was - but Tech is there to find things early - that can be found. I've seen a suspension failure at a PCA HPDE that ended involving more than one car and bent metal. Not to mention the safety aspect.Originally posted by Pklauser View PostComment
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EACMEN:Originally posted by eacmen View Post
Was this the failing part?? https://store.vacmotorsports.com/vac...-m3-p3748.aspxComment
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That’s the only part I can find. Don’t know the driver personally just saw the insta post.Originally posted by Feffman View PostComment
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It looks like it's Crooked Commie. I think he is on this forum, he was definitely on the old one.Comment
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What's odd in the photo is the sheared taper (remaining in the spindle) is flush to the spindle. The stud attached to the tie-rod still has part of the taper on it, suggesting that the flange on the stud wasn't sitting flush to the spindle.'05 M3 Convertible 6MT, CB/Cinnamon, CSL Airbox&Flap, PCSTuning, Beisan, Schrick 288/280, SS V1's & 2.5" System, RE Stg 1&SMF, KW V2, CB PS, Apex EC-7RComment
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my thoughts as well. It would appear that the tapered stud was not machined to the proper max OD.Originally posted by jbfrancis3 View PostComment
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VAC par.
2005 IR/IR M3 Coupe
2012 LMB/Black 128i
2008 Black/Black M5 SedanComment
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All - this was my car, running the VAC Bump Steer tie rod kit. Yes the car is inspected and teched before every event. There was no indication on the stud of an upcoming failure. The tie rod spherical was functioning as expected with no play. Installation was absolutely completed to spec. I will have to review how many events exactly were on this tie rod. Below a picture of how it sheared. I think there is a moment arm being created that will eventually fatigue the stud where it meets the spindle. I am switching to stock tie rods for now, and looking into the SLR or AKG kit for the future - I'm not comfortable running the VAC bump steer or their control arms anymore.Attached FilesLast edited by CrookedCommie; 08-31-2021, 06:40 AM.Comment
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This is how their stud is designed, and yes, I believe this led to the failure. The stud should have a shoulder to sit on the spindle or it will eventually shear in this manner. Hence why I am looking into the SLR kit as it has a whole bracket that seats on the spindle.Originally posted by jbfrancis3 View PostComment
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Based on this for sale post, it looks to me like VAC updated the design, probably to avoid this exact failure. Of course I haven't seen any info or PSA yet.
Compare the updated stud to the original design on their website:
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