Blew something in my rear end with only 474whp
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Joined: Apr 2015
Posts: 97
Likes: 10
From: Anaheim Ca
Automatic trans
I have had direct contact with 4 C7 corvette owners plus myself that have had spider gear breakage.All of us have a "*****" automatic.One owner who is presently upgrading to a 1500 HP set-up has had me modify his undamaged differential (his is a manual trans)with 4 spider gears (as I did in a used replacement) instead of just the 2 as it is produced.I believe there is a company that will soon have a heavy duty differential (ring gear carrier section only) for the non-elsd units.I have even spoken with the manufacture of the differentials for GM,and they say they are not allowed to supply any parts to anyone, except GM. As long as the side gears are still good the spider gears and cross shafts can be replaced with C6 parts.If anyone has some good side gears from a C7 I am interested in obtaining them for future repairs for those who need them.
Ed
Ed
Burning Brakes
Joined: Apr 2014
Posts: 780
Likes: 176
From: MV CA
I saw this happen on the Ron Fellows school track when the instructor was demonstrating launch control. GM covered this cause it was a stock Z51. I have 610 RWHP with ***** automatic cause I live in California and need to keep the wife happy and no problems to date. Knock on wood.
Last edited by smajicek; May 23, 2017 at 12:12 AM.
Thread Starter
Racer
Joined: Oct 2016
Posts: 434
Likes: 27
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
One of the nice side benefits of the DSC Sport MSRC controller is that as soon as the system sees WOT, it softens the rear dampers, squats, sticks and goes without wheel hop.
While GM condones "track use," I don't think that includes drifting and donuts. You may have stressed the spyder gears earlier, and your last launch was the final straw.
While GM condones "track use," I don't think that includes drifting and donuts. You may have stressed the spyder gears earlier, and your last launch was the final straw.
Thread Starter
Racer
Joined: Oct 2016
Posts: 434
Likes: 27
I have had direct contact with 4 C7 corvette owners plus myself that have had spider gear breakage.All of us have a "*****" automatic.One owner who is presently upgrading to a 1500 HP set-up has had me modify his undamaged differential (his is a manual trans)with 4 spider gears (as I did in a used replacement) instead of just the 2 as it is produced.I believe there is a company that will soon have a heavy duty differential (ring gear carrier section only) for the non-elsd units.I have even spoken with the manufacture of the differentials for GM,and they say they are not allowed to supply any parts to anyone, except GM. As long as the side gears are still good the spider gears and cross shafts can be replaced with C6 parts.If anyone has some good side gears from a C7 I am interested in obtaining them for future repairs for those who need them.
Ed
Ed
One of the nice side benefits of the DSC Sport MSRC controller is that as soon as the system sees WOT, it softens the rear dampers, squats, sticks and goes without wheel hop.
While GM condones "track use," I don't think that includes drifting and donuts. You may have stressed the spyder gears earlier, and your last launch was the final straw.
While GM condones "track use," I don't think that includes drifting and donuts. You may have stressed the spyder gears earlier, and your last launch was the final straw.
Im at 5k miles btw
Last edited by Steve Garrett; May 29, 2017 at 03:08 PM. Reason: Merged Posts-please use the Multi-Quote button (the middle icon) in the lower right hand corner of each post to make your responses look like this!
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Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
I'm not talking about OEM launch control. I'm talking about a replacement aftermarket controller which transforms the way an MSRC-equipped car performs, including hard launches. A big cause of wheel hop is a rear suspension which isn't effectively transferring weight to the rear wheels.
Last edited by Foosh; May 23, 2017 at 12:34 AM.
Thread Starter
Racer
Joined: Oct 2016
Posts: 434
Likes: 27
I'm not talking about OEM launch control. I'm talking about a replacement aftermarket controller which transforms the way an MSRC-equipped car performs, including hard launches. A big cause of wheel hop is a rear suspension which isn't effectively transferring weight to the rear wheels.
Last edited by Steve Garrett; May 29, 2017 at 03:08 PM. Reason: Merged Posts-please use the Multi-Quote button (the middle icon) in the lower right hand corner of each post to make your responses look like this!
Team Owner
Joined: Oct 2004
Posts: 25,583
Likes: 16,942
While i can't guarantee it will totally eliminate wheel hop, I haven't seen it since I installed mine, but driver technique is always a factor. As I said, when the DSC controller sees WOT without lateral G forces, it immediately softens the rear MSRC shocks and transfers weight to the rear tires, which makes great launches much more effortless. When cornering, it stiffens things up on the appropriate side.
It's a much more predictive than reactive system like the OEM MSRC controller. I don't think the tires were your problem.
It's a much more predictive than reactive system like the OEM MSRC controller. I don't think the tires were your problem.
Thread Starter
Racer
Joined: Oct 2016
Posts: 434
Likes: 27
While i can't guarantee it will totally eliminate wheel hop, I haven't seen it since I installed mine, but driver technique is always a factor. As I said, when the DSC controller sees WOT without lateral G forces, it immediately softens the rear MSRC shocks and transfers weight to the rear tires, which makes great launches much more effortless. When cornering, it stiffens things up on the appropriate side.
It's a much more predictive than reactive system like the OEM MSRC controller. I don't think the tires were your problem.
It's a much more predictive than reactive system like the OEM MSRC controller. I don't think the tires were your problem.
What needs to come out to change the diff on these cars? I might as well get the delrin bushings if the whole rear end needs to come out so i can put them in along with the new diff.
Last edited by Liter of cola; May 23, 2017 at 06:43 AM.
Race Director
Joined: Jun 2005
Posts: 10,909
Likes: 2,701
From: Phila Suburbs 2023 C8 & 2013 650ix
One thing you are going to learn the hard way and the expensive way is that once you experience wheel hop, you have to "immediately" let off the gas. Blaming the tires or GM is just pissing in the wind. You should be blaming yourself for not knowing better.
Le Mans Master
Joined: Sep 2012
Posts: 8,793
Likes: 145
Well... I'm certainly no expert, and I know that a whole lot of people have many, many hard standing start launches without broken rear ends, but this is why I've always been more of a rolling start guy for my street fun. Rolling in from mid 1st or 2nd, I see as having much better chance of hooking up/not putting it in the grass or wall, and much less chance of blowing up the tranny/diff/halfshafts/whatever.
Maybe if you didn't have a tune you still have some chance of getting a warranty coverage? I wish you the best of luck.
Maybe if you didn't have a tune you still have some chance of getting a warranty coverage? I wish you the best of luck.
Le Mans Master
Joined: Jan 2017
Posts: 5,363
Likes: 4,108
From: New England
Well... I'm certainly no expert, and I know that a whole lot of people have many, many hard standing start launches without broken rear ends, but this is why I've always been more of a rolling start guy for my street fun. Rolling in from mid 1st or 2nd, I see as having much better chance of hooking up/not putting it in the grass or wall, and much less chance of blowing up the tranny/diff/halfshafts/whatever.
Maybe if you didn't have a tune you still have some chance of getting a warranty coverage? I wish you the best of luck.
Maybe if you didn't have a tune you still have some chance of getting a warranty coverage? I wish you the best of luck.
Team Owner
Joined: Sep 1999
Posts: 41,732
Likes: 1,718
From: Springfield MO
Are the C7's spider gears weaker than the old C6's? If so, you would think GM would resolve the problem by a redesign.
When the C6's first came out, people were blowing the CV joints. GM changed the design of the CV joints for the C6's and they were weaker than the old C5's. C5 axles in the C6 solved the problem.
I believe GM finally fixed the design.
As for wheel hop, the C6's also had it, but when they introduced the ZR1, they had different diameter axles(left to right) to cure the wheel hop, and they also put the larger axles into the Z06.
GM is pretty proficient about redesigning parts to reduce manufacturing costs, and ending up with weaker parts than the ones they replaced, meaning they have to go back and redesign the parts again to fix the problem they created.
When the C6's first came out, people were blowing the CV joints. GM changed the design of the CV joints for the C6's and they were weaker than the old C5's. C5 axles in the C6 solved the problem.
I believe GM finally fixed the design.
As for wheel hop, the C6's also had it, but when they introduced the ZR1, they had different diameter axles(left to right) to cure the wheel hop, and they also put the larger axles into the Z06.
GM is pretty proficient about redesigning parts to reduce manufacturing costs, and ending up with weaker parts than the ones they replaced, meaning they have to go back and redesign the parts again to fix the problem they created.
Melting Slicks
Joined: Jun 2016
Posts: 2,845
Likes: 521
From: Eastern WA
Kind of crazy they broke just spinning them. That isn't as much load as a prepped track and hooking them up on a good launch. You can spin them just as hard with a stock motor. Hopefully the dealer sees it this way too.
Former Vendor
Joined: Dec 2015
Posts: 747
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From: Jessup MD