Issue with GM on Lowering C7
09-09-2017, 04:19 PM
#41
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To be honest, the dealer wouldn.t know if its lowered on stock bolts or not. there is no 100% standard for the stock bolt location. They vary as they arrive at dealerships. There probably is a standard, but there is no way it is adhered to based on the different ride heights I have seen on new cars.
My dealer absolutely refused to lower my car on stock bolts before I drove it home, citing some BS about manufacturer prohibiting it. Right.
09-09-2017, 09:20 PM
#42
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St. Jude Donor '13
If they knew the car was adjusted to be outside of those specs after it left the factory, that would give them legal grounds to deny many kinds of warranty claims on the suspension. Having the dealer do the work establishes a paper trail. If you lower it yourself all the way on the stock bolts, they might say that no C7 is allowed to leave the factory set that way and you must have done it after delivery.
Persuading GM that your car was properly adjusted and they should cover it is one thing. Fighting GM on a warranty claim is a whole 'nuther story, you can easily wait years and spend more money on lawyers than you spent for your car.
More importantly, I've seen several sources that appear credible who say that best handling is achieved at stock ride height.
Besides, many people think a slammed 'vette looks like a ricer.
Last edited by Gearhead Jim; 09-09-2017 at 09:32 PM.
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09-09-2017, 10:53 PM
#43
Race Director
^^^ This really is the best solution. If you ever have a warranty claim on the suspension (which is unlikely) then just set it back to a higher ride height.
09-09-2017, 11:47 PM
#44
So what is the published spec? I'd like to see it.
09-10-2017, 04:15 AM
#45
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^^^ Makes two of us
09-10-2017, 04:48 PM
#46
I guess it must be a well-kept secret.
09-10-2017, 04:51 PM
#47
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It is extremely proprietary. Know only to a select few. Not even Mike Furman knows ............ 
09-10-2017, 06:22 PM
#48
They do publish ride height specs and two ways to measure them. One way requires measuring between two points on the suspension under the car, up on an alignment rack. The other just measures from the pavement to the top of the wheel well arch.
If they knew the car was adjusted to be outside of those specs after it left the factory, that would give them legal grounds to deny many kinds of warranty claims on the suspension. Having the dealer do the work establishes a paper trail. If you lower it yourself all the way on the stock bolts, they might say that no C7 is allowed to leave the factory set that way and you must have done it after delivery.
Persuading GM that your car was properly adjusted and they should cover it is one thing. Fighting GM on a warranty claim is a whole 'nuther story, you can easily wait years and spend more money on lawyers than you spent for your car.
More importantly, I've seen several sources that appear credible who say that best handling is achieved at stock ride height.
Besides, many people think a slammed 'vette looks like a ricer.
If they knew the car was adjusted to be outside of those specs after it left the factory, that would give them legal grounds to deny many kinds of warranty claims on the suspension. Having the dealer do the work establishes a paper trail. If you lower it yourself all the way on the stock bolts, they might say that no C7 is allowed to leave the factory set that way and you must have done it after delivery.
Persuading GM that your car was properly adjusted and they should cover it is one thing. Fighting GM on a warranty claim is a whole 'nuther story, you can easily wait years and spend more money on lawyers than you spent for your car.
More importantly, I've seen several sources that appear credible who say that best handling is achieved at stock ride height.
Besides, many people think a slammed 'vette looks like a ricer.
09-10-2017, 07:58 PM
#50
LOL . . . uh oh, I'm screwed then, 2.25 fingers on the front, and 2 on the back on mine.
09-10-2017, 08:05 PM
#51
Safety Car
YMMV, but lowering it is the last thing I would want to do. It already scrapes coming out of a parking lot or over a speed bump. Slow and angled helps reduce this, but it does not eliminate it. I can't imagine what would happen if it were lowered even more. Why do you guys want to do this?
09-10-2017, 08:44 PM
#52
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RL, my dealership (a Hendrick dealership) lowered my Stingray with no issues. Find another dealership to do the work for you.
09-10-2017, 09:29 PM
#53
My local Buick/GMC dealer lowered mine for sixty bucks. 
09-10-2017, 09:41 PM
#54
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^^^ Some will, some won't.
09-10-2017, 11:46 PM
#55
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It's in the Service Manual or at least the on-line version dealers use. Someone posted a copy of the page here, I printed it out for my own use but didn't save a copy in the computer. I should be able post a copy up here some time tomorrow (Monday).
09-10-2017, 11:53 PM
#56
Thanks, I would appreciate that.
P.S. we were just keeping this thread on the first page until you came back.
P.S. we were just keeping this thread on the first page until you came back.
Last edited by Foosh; 09-11-2017 at 12:00 AM.
09-11-2017, 06:32 AM
#57
never an issue except which speed bumps other than that everything is perfect.
I can't stand a very high "stock" vette and sport car in my opinion should be lowered & since it's on stock bolts it should be possible as it's within factory perimeters other wise they could've just made it fixed.
09-11-2017, 07:57 AM
#58
Regarding handling and performance, many of us have installed the DSC Sport MSRC controller, which the vast majority consider to be a major upgrade in the performance of the MRSC dampers. It improves both handling and ride comfort because it utilizes a number of sensors already in the car to adjust damper firmness/softness on all four corners independently, which the OEM controller does not utilize. A number of folks have shaved their lap times by a couple of seconds after installing one.
DSC recommends "stock ride height" for best performance, so I'm trying to figure out exactly what that is. I know they do not recommend lowering it all the way on the stock bolts because that does reduce suspension travel, and hence the ability of the shocks to perform up to their max capabilities in keeping the chassis settled.
DSC recommends "stock ride height" for best performance, so I'm trying to figure out exactly what that is. I know they do not recommend lowering it all the way on the stock bolts because that does reduce suspension travel, and hence the ability of the shocks to perform up to their max capabilities in keeping the chassis settled.
Last edited by Foosh; 09-11-2017 at 08:18 AM.
09-11-2017, 08:10 AM
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09-11-2017, 09:57 AM
#60
Race Director
Just to be clear, lowering on stock bolts does not give the car a "slammed" look. There's not enough adjustability built in for that.