When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I know there have been other threads on this, but here's my experience, observations and measurements.
Like others have seen, my dealer had no idea what I was talking about. They told me there were no service advisories for my car and I told them that this was an optional software upgrade, not an update or fix. Later they came back with printouts of my C7 GS "build" proving that no upgrade was available. They even asserted that my GS didn't have the magnetic ride control feature. I asked them to call the GM tech line to get the upgrade details. They reluctantly humored me in this regard and then came back 15 minutes later to apologize and confirm that the upgrade was available and they were in the middle of installing it.
The day before I took the GS in, I found a bumpy section of road and drove for a fixed distance at a fixed speed in touring mode. I had a special app installed on my cell phone for recording bump data, though now that I think about it, I should have used the PDR feature instead and extracted the details from that. After the update, I let the car sit for one day and then went back to the exact same section of road and drove at the same speed for the same distance in touring mode, recording the bump data again.
From a seat of the pants perspective, the change is subtle. My wife was with me both times and couldn't tell the difference, but I did feel it was marginally smoother and more linear. Comparing the bump data, there is an obvious difference. On average around a 22% smoother ride. Here is a comparison of the raw data. This represents around one minute of driving. The top line is before the upgrade and the bottom line is after the upgrade. The spike near the end is driving over some train tracks.
Had mine done Wednesday at Grey Chevrolet, Port Orchard, WA. They knew all about it and had no issues. In Tour I felt an immediate difference in steering. It's much lighter, a bit scary. I would prefer a bit of resistance. I can probably find that in Sport. I had the impression it was a smoother ride, but that's awfully subjective. It may have been smooth asphalt. Thanks for the graph. That pretty well proves it.
Koranke , What is your build date on your GS ? I thought I read that the late 17 builds dates already had upgrade. I might have read wrong.Planning on checking with dealer when I do my next oil change my build date is 5/11/17. Is that app available for I phone?
Koranke , What is your build date on your GS ? I thought I read that the late 17 builds dates already had upgrade. I might have read wrong.Planning on checking with dealer when I do my next oil change my build date is 5/11/17. Is that app available for I phone?
Koranke , What is your build date on your GS ? I thought I read that the late 17 builds dates already had upgrade. I might have read wrong.Planning on checking with dealer when I do my next oil change my build date is 5/11/17. Is that app available for I phone?
Not sure of the build date, but I bought it on 6/10/2017, so before that. I created the app myself for a Windows phone, but you should be able to find similar apps for the iPhone.
Had mine done Wednesday at Grey Chevrolet, Port Orchard, WA. They knew all about it and had no issues. In Tour I felt an immediate difference in steering. It's much lighter, a bit scary. I would prefer a bit of resistance. I can probably find that in Sport. I had the impression it was a smoother ride, but that's awfully subjective. It may have been smooth asphalt. Thanks for the graph. That pretty well proves it.
Had mine done there in February, first one for them. No issues also. A little time spent figuring out the payment stuff. Said I would sign a waver to the 8 hour wait period that concerned them. Mark, the Corvette Tech, really knows his stuff. Saw him measuring the ride height during the process.
Did you by chance notice the difference immediately after the upgrade--i.e., not after waiting 8-10 hours for "curing"? I noticed the difference driving home from the dealership (35 miles) with no change after sitting 23 hours.
Originally Posted by Borntorun04/17
Koranke , What is your build date on your GS ? I thought I read that the late 17 builds dates already had upgrade. I might have read wrong.Planning on checking with dealer when I do my next oil change my build date is 5/11/17. Is that app available for I phone?
I think the upgrade cutoff is more like late-'18. There's a thread already active on checking the status of your software versions, including MRSC. Go to Page 9, Reply #180 for specific instructions on getting that info. If you have a GS of any YM:
Old version on all '17s and some '18s: 84136537
All (?) '19s + upgrade version: 84421869
Had mine done there in February, first one for them. No issues also. A little time spent figuring out the payment stuff. Said I would sign a waver to the 8 hour wait period that concerned them. Mark, the Corvette Tech, really knows his stuff. Saw him measuring the ride height during the process.
I remember you saying that so I took along Tadge's statement that you didn't have to leave the car and could let it sit at home, so they didn't make me sign anything. I had never used them for service. A little funky compared to Haselwood, but nice guys and as far as I can tell very competent. Sure was a bitch getting back on SR16. I avoided Sedgwick and went the other way. It was worse!
What about the car needing to sit for 8 to 10 hours after the flash?
The car can be driven immediately after the flash. It does not have to sit at the dealership. The temperature compensation will not be normalized until the vehicle has sat for 8 to 10 hours. Where and when this happens is irrelevant. When the vehicle sits for 8 to 10 hours, the temperature compensation will then be normalized.
The day before I took the GS in, I found a bumpy section of road and drove for a fixed distance at a fixed speed in touring mode. I had a special app installed on my cell phone for recording bump data, ... After the update, I let the car sit for one day and then went back to the exact same section of road and drove at the same speed for the same distance in touring mode, recording the bump data again.
From a seat of the pants perspective, the change is subtle. My wife was with me both times and couldn't tell the difference, but I did feel it was marginally smoother and more linear. Comparing the bump data, there is an obvious difference. On average around a 22% smoother ride. Here is a comparison of the raw data. This represents around one minute of driving. The top line is before the upgrade and the bottom line is after the upgrade. The spike near the end is driving over some train tracks.
Your charts definitely show the ride is less harsh especially going over the railroad tracks. The suspension absorbs more of the impact.
Had my 2017 GS done today. Seemed a little better on long ride home. I was told the new guidance is to let it set 24 hours, not 8 to 10. Can't wait to see if the ride has improved.
Did you by chance notice the difference immediately after the upgrade--i.e., not after waiting 8-10 hours for "curing"? I noticed the difference driving home from the dealership (35 miles) with no change after sitting 23 hours.
I think the upgrade cutoff is more like late-'18. There's a thread already active on checking the status of your software versions, including MRSC. Go to Page 9, Reply #180 for specific instructions on getting that info. If you have a GS of any YM:
Old version on all '17s and some '18s: 84136537
All (?) '19s + upgrade version: 84421869
The version on my 17 CE GS is 84136536. Looks like I need to get an upgrade.
So for those that did the upgrade - is the consensus its worth the $350 and you see a big difference or the difference is marginal and you wouldn't spend the money if given the choice knowing what you know now?
So for those that did the upgrade - is the consensus its worth the $350 and you see a big difference or the difference is marginal and you wouldn't spend the money if given the choice knowing what you know now?
I wouldn't say its a big difference or marginal; it's somewhere in between. But definitely worth it to me.
05-26-2018, 07:36 PM
Magnetic Ride Control Upgrade
