[Z06] Weird (aftermarket) suspension failure.
#1
Race Director<br><img src="/forums/images/ranks/7k-10k.gif" border="0">
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Weird (aftermarket) suspension failure.
Cruise-In attendees and followers are probably already aware that I had a significant suspension failure on my Z06 in Bowling Green.
There was a 6x6 or 8x8 piece of lumber in the road. Because of oncoming traffic, I couldn't move over far enough to miss it completely. There's not a mark on my bumper, so it appears that I hit it with the Gurney lip and the little bit of tire that sticks out. The impact punched out the coil-over mount but, as near as can figure (mechanics will be looking at it after the holiday) there isn't any other damage. (Pictures below.) The wheel has no scratches, dents or dings, and the tire is still holding normal pressure.
Since this is the first time I've banged up a Corvette, I'm looking for commentary on things to be sure to check for during the repair process - what little details need special attention to be sure the car gets back to factory standard condition, and where will it never make it back?
FWIW, it's a complete Pfadt setup - coilovers, sways, camber kit, and bushings.
There was a 6x6 or 8x8 piece of lumber in the road. Because of oncoming traffic, I couldn't move over far enough to miss it completely. There's not a mark on my bumper, so it appears that I hit it with the Gurney lip and the little bit of tire that sticks out. The impact punched out the coil-over mount but, as near as can figure (mechanics will be looking at it after the holiday) there isn't any other damage. (Pictures below.) The wheel has no scratches, dents or dings, and the tire is still holding normal pressure.
Since this is the first time I've banged up a Corvette, I'm looking for commentary on things to be sure to check for during the repair process - what little details need special attention to be sure the car gets back to factory standard condition, and where will it never make it back?
FWIW, it's a complete Pfadt setup - coilovers, sways, camber kit, and bushings.
Last edited by Just J; 05-26-2008 at 05:53 AM.
#2
Racer
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wow that sucks...glad iy didnt mess anything else up....I dont think you'll really be able to tell anything else until you get it fixed....then youll be able to tell what else happened.....I was ran off the road in my camaro ss a few years ago...had a set of aftermarket wheels and it was lowered. I got cut off and nailed a 6inch high curb....completely snaped 2 rims.....didnt do any other damaged though. I was really suprised.....so you never know
#3
Race Director
I recall a number of folks asking about the rumoured weakness in the shock mount area... but they were chased off as fear mongers and nay-sayers.
I guess the upper shock mount is a weak point in the Vette chassis, since it is designed for transverse leaf springs... not coil springs.
I guess the upper shock mount is a weak point in the Vette chassis, since it is designed for transverse leaf springs... not coil springs.
#5
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I recall a number of folks asking about the rumoured weakness in the shock mount area... but they were chased off as fear mongers and nay-sayers.
I guess the upper shock mount is a weak point in the Vette chassis, since it is designed for transverse leaf springs... not coil springs.
I guess the upper shock mount is a weak point in the Vette chassis, since it is designed for transverse leaf springs... not coil springs.
#7
Race Director
So in your opinion, the forces acting on the upper shock mount are no more with a coil over setup than a transverse leaf setup while driving over an 8x8 log?
I would rather say that it is possible the use of a coil over contributed to this failure - afterall, we really dont know do we?
Anyway - there were a number of comments from supposed GM source about the weaker aluminium upper shock mounts.
*shrug*
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SivaSuryaKshatriya (09-08-2022)
#9
I realize that he drove over a railroad tie sized piece of lumber. What I would worry about would be the GM designing that went into the shock mounting point wasn't spec'd for a coil over setup. The lumber caused a sharp impact leading to catastrophic failure. Would repeated track days cause the upper shock mounts to distort or metal fatigue?
#10
Race Director
I seem to recall this discussion happening at the time the C6 Z chassis was being tossed around as a possible race solution.
#11
Why do we argue over this crap?
Drive over a 6"-8" friggen log and you should expect some pretty good damage to an expensive, highly computerized, precision light weight sports car like a Corvette.
Moral of the story: Drive your truck over crap like this...then, hold your stones. Otherwise give yourself plenty enough room between vehicles to make corrections, braking and otherwise. Continue daily to dodge life's "unforunate incidence bullets" as they get thrown at you and hope for the best.
Look at the structural damage incidence rate for coilover users, not very common if at all.
This is just arm-chair quarterbacking.
Last edited by WFO; 05-25-2008 at 04:08 PM.
#12
I realize that he drove over a railroad tie sized piece of lumber. What I would worry about would be the GM designing that went into the shock mounting point wasn't spec'd for a coil over setup. The lumber caused a sharp impact leading to catastrophic failure. Would repeated track days cause the upper shock mounts to distort or metal fatigue?
Secondly, he did indeed drive over a log sized piece of wood. You would expect damage after that, however, is it reasonable to expect this much damage?
Dang, a Katech Z too. Wonder what the repair will involve.
#13
Melting Slicks
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I respectfully disagree. This is a prime example of what can happen when you impose loads on a structure (the shock mount) that it was not designed or tested to resist.
You modify cars at your own risk. I am willing to bet money that this failure WOULD NOT have occured if the car had the OEM leaf springs.
Frank Gonzalez
You modify cars at your own risk. I am willing to bet money that this failure WOULD NOT have occured if the car had the OEM leaf springs.
Frank Gonzalez
#14
Race Director
I am guessing there is a reason fo rthis - besides cost.
I do believe Short Throws car is based on a steel C6 chassis, not the alumium one - and I think it is safe to say that was a not a decision based purely on the cost of the steel vs alumium chassis.
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I respectfully disagree. This is a prime example of what can happen when you impose loads on a structure (the shock mount) that it was not designed or tested to resist.
You modify cars at your own risk. I am willing to bet money that this failure WOULD NOT have occured if the car had the OEM leaf springs.
Frank Gonzalez
You modify cars at your own risk. I am willing to bet money that this failure WOULD NOT have occured if the car had the OEM leaf springs.
Frank Gonzalez
#16
Drifting
Correct me if I'm wrong; but after looking the picture several time, does that picture shows that the shock mount/tower gave in and the coilover shock went up & through the shock mount/tower? In addition, if I may, how fast were you going when you hit the lumber? TIA Glad you ok and the car does not look too bad. Thx again!
#17
Former Vendor
I would love to see pictures of the upper top hat from the inside. IL, umm, maybe I will head that way to take a look???
Randy
www.dougrippie.com
Randy
www.dougrippie.com
#18
Race Director<br><img src="/forums/images/ranks/7k-10k.gif" border="0">
Thread Starter
Correct me if I'm wrong; but after looking the picture several time, does that picture shows that the shock mount/tower gave in and the coilover shock went up & through the shock mount/tower? In addition, if I may, how fast were you going when you hit the lumber? TIA Glad you ok and the car does not look too bad. Thx again!
I would love to see pictures of the upper top hat from the inside. IL, umm, maybe I will head that way to take a look???
Randy
www.dougrippie.com
Randy
www.dougrippie.com
#19
Drifting
I would love to see pictures of the upper top hat from the inside. IL, umm, maybe I will head that way to take a look???
Randy
www.dougrippie.com
Randy
www.dougrippie.com
#20
I'm very sorry to read of your misfortune - life's a bitch for sure!
Glad you're OK
I hope you will post more information about your accident when you get it.
Most doubts about the suspension mount and the fitting of coilovers,concern not so much the structural strength of the mount itself, but rather the possibility of metal fatigue in the structure around the mount, caused by the continuous flexing of the frame on a long term basis.
How many miles have you done with the coilovers fitted?
Glad you're OK
I hope you will post more information about your accident when you get it.
Most doubts about the suspension mount and the fitting of coilovers,concern not so much the structural strength of the mount itself, but rather the possibility of metal fatigue in the structure around the mount, caused by the continuous flexing of the frame on a long term basis.
How many miles have you done with the coilovers fitted?