[ANSWERED] Melting AFM Actuators
#21
CF Old Timer
#22
Burning Brakes
Wonderful. I'm taking my '16 Z51 M7 tracking on 8/11. I hope I don't face the same issues as you are. When I was at Spring Mountain I never had an issue with the same car, but it was only in the 50's and our lapping sessions were pretty dang short.
#23
Sr.Random input generator
Guys, you can just do what I did:
https://www.corvetteforum.com/forums...k-driving.html
When/if they come up with a solution for prior years, we can then get it. In the meantime, no one should deal with this mess.
I've made two track days since, and the last one was an open track day at 95-98 degrees F. So far, no issues with the actuators 'removed' : )
Regarding the answer, I am glad that the actuators are removed for the 17+ models, but it is still shocking that there is still no permanent solution. At the very least, GM should definitely let us stop by dealers and get it disabled. As far as I know, actuators stay open when disabled. They would just stay open, and even if the actual actuator malfunctions, since it is disabled, we'd not need to care.
https://www.corvetteforum.com/forums...k-driving.html
When/if they come up with a solution for prior years, we can then get it. In the meantime, no one should deal with this mess.
I've made two track days since, and the last one was an open track day at 95-98 degrees F. So far, no issues with the actuators 'removed' : )
Regarding the answer, I am glad that the actuators are removed for the 17+ models, but it is still shocking that there is still no permanent solution. At the very least, GM should definitely let us stop by dealers and get it disabled. As far as I know, actuators stay open when disabled. They would just stay open, and even if the actual actuator malfunctions, since it is disabled, we'd not need to care.
Last edited by X25; 07-29-2016 at 08:26 AM.
The following 2 users liked this post by X25:
IN54NITY (08-03-2016),
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#24
Melting Slicks
Guys, you can just do what I did:
https://www.corvetteforum.com/forums...k-driving.html
When/if they come up with a solution for prior years, we can then get it. In the meantime, no one should deal with this mess.
I've made two track days since, and the last one was an open track day at 95-98 degrees F. So far, no issues with the actuators 'removed' : )
Regarding the answer, I am glad that the actuators are removed for the 17+ models, but it is still shocking that there is still no permanent solution. At the very least, GM should definitely let us stop by dealers and get it disabled. As far as I know, actuators stay open when disabled. They would just stay open, and even if the actual actuator malfunctions, since it is disabled, we'd not need to care.
https://www.corvetteforum.com/forums...k-driving.html
When/if they come up with a solution for prior years, we can then get it. In the meantime, no one should deal with this mess.
I've made two track days since, and the last one was an open track day at 95-98 degrees F. So far, no issues with the actuators 'removed' : )
Regarding the answer, I am glad that the actuators are removed for the 17+ models, but it is still shocking that there is still no permanent solution. At the very least, GM should definitely let us stop by dealers and get it disabled. As far as I know, actuators stay open when disabled. They would just stay open, and even if the actual actuator malfunctions, since it is disabled, we'd not need to care.
What happens when the car goes in eco mode without the valve closed? It seems there are noise and vibration issues. Is that true? Or maybe its only an issue on the auto...for some unknown reason that no one has explained yet.
Last edited by djnice; 07-29-2016 at 02:49 PM.
The following users liked this post:
Harris (08-11-2016)
#25
Safety Car
Guys, you can just do what I did:
https://www.corvetteforum.com/forums...k-driving.html
When/if they come up with a solution for prior years, we can then get it. In the meantime, no one should deal with this mess.
I've made two track days since, and the last one was an open track day at 95-98 degrees F. So far, no issues with the actuators 'removed' : )
Regarding the answer, I am glad that the actuators are removed for the 17+ models, but it is still shocking that there is still no permanent solution. At the very least, GM should definitely let us stop by dealers and get it disabled. As far as I know, actuators stay open when disabled. They would just stay open, and even if the actual actuator malfunctions, since it is disabled, we'd not need to care.
https://www.corvetteforum.com/forums...k-driving.html
When/if they come up with a solution for prior years, we can then get it. In the meantime, no one should deal with this mess.
I've made two track days since, and the last one was an open track day at 95-98 degrees F. So far, no issues with the actuators 'removed' : )
Regarding the answer, I am glad that the actuators are removed for the 17+ models, but it is still shocking that there is still no permanent solution. At the very least, GM should definitely let us stop by dealers and get it disabled. As far as I know, actuators stay open when disabled. They would just stay open, and even if the actual actuator malfunctions, since it is disabled, we'd not need to care.
I'm surprised there weren't many driving the C7 hard enough to melt these every time. Claude must be one of the few driving the Stingray hard.
Last edited by SBC_and_a_stick; 07-29-2016 at 02:38 PM.
#27
Pro
Check out this TechLink about track engine temperatures including a few comments about the A8 and M7:
http://sandyblogs.com/techlink/?p=4998
http://sandyblogs.com/techlink/?p=4998
#28
Sr.Random input generator
Check out this TechLink about track engine temperatures including a few comments about the A8 and M7:
http://sandyblogs.com/techlink/?p=4998
http://sandyblogs.com/techlink/?p=4998
#29
Melting Slicks
I know it won't fix your issue but I wonder if this will help. I know after every session on track I always drive to the other paddock (@VIR) or around for at least 5-10mins at roughly 25-40 MPH in 3rd or 4th. My experience is, that I have been able to get my brakes & rotors to last longer and my oil samples from Blackstone have consistently come back good. I know its only a consolation but at least its worth a try.
#30
I know it won't fix your issue but I wonder if this will help. I know after every session on track I always drive to the other paddock (@VIR) or around for at least 5-10mins at roughly 25-40 MPH in 3rd or 4th. My experience is, that I have been able to get my brakes & rotors to last longer and my oil samples from Blackstone have consistently come back good. I know its only a consolation but at least its worth a try.
Are you implying that some other drivers don't do cool down laps
For those that don't, try this next time for as a simple example. Next time you are done with a session, get out and get your ungloved hand as close to the rotors as possible. Toasty.
Than the next time do a full on cool down lap, and drive at least 5 mins at slow speed. Than get out and recheck. Not so toasty.
Notice how much less heat is present.
At WSIR this would mean driving to SOW, or even leaving the track and driving in the desert for 5 mins if too much traffic track side.
As to AFM, not quite sure.....but as a general precaution.....maybe it's b/c my track is in the desert......so maybe this is a common practice that gets copied locally.
In other parts of the country, do drivers do a cool down every time.? I would guess yes?
Laser pyrometry is also a more reliable way to check this.....than an ungloved hand.
Last edited by DLC7; 07-30-2016 at 12:17 PM.
#31
Drifting
Are you implying that some other drivers don't do cool down laps
For those that don't, try this next time for as a simple example. Next time you are done with a session, get out and get your ungloved hand as close to the rotors as possible. Toasty.
Than the next time do a full on cool down lap, and drive at least 5 mins at slow speed. Than get out and recheck. Not so toasty.
Notice how much less heat is present.
At WSIR this would mean driving to SOW, or even leaving the track and driving in the desert for 5 mins if too much traffic track side.
As to AFM, not quite sure.....but as a general precaution.....maybe it's b/c my track is in the desert......so maybe this is a common practice that gets copied locally.
In other parts of the country, do drivers do a cool down every time.? I would guess yes?
Laser pyrometry is also a more reliable way to check this.....than an ungloved hand.
For those that don't, try this next time for as a simple example. Next time you are done with a session, get out and get your ungloved hand as close to the rotors as possible. Toasty.
Than the next time do a full on cool down lap, and drive at least 5 mins at slow speed. Than get out and recheck. Not so toasty.
Notice how much less heat is present.
At WSIR this would mean driving to SOW, or even leaving the track and driving in the desert for 5 mins if too much traffic track side.
As to AFM, not quite sure.....but as a general precaution.....maybe it's b/c my track is in the desert......so maybe this is a common practice that gets copied locally.
In other parts of the country, do drivers do a cool down every time.? I would guess yes?
Laser pyrometry is also a more reliable way to check this.....than an ungloved hand.
I agree on some tracks there isn't alot of room or time to do a full cool down lap. But even in the desert it should help because the temperature delta between brakes / exhaust / oil / trans fluid should be quite high. On the GS I tend to use at least 3rd because I want the engine well above idle but below the mid-range powerband, roughly just under 2500 RPMs. Through my testing this results in the quickest cooling on my car. Although it seems that it wouldn't help much for the drivers that are having failures during their sessions.
#32
Tech Contributor
Thread Starter
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"Ask Tadge" Producer
Unfortunately, he works for a major corporation that isn't going to allow him to admit or commit to any solution publicly.
Also, to address your first response a little more clearly: bear in mind that when Tadge writes his answers, he realizes that they'll be read by more than just the person who asked it. Therefore he attempts to address the general population with the answers. For instance, his mention of modifications to the car weren't to point a finger at you. Rather to let folks know what could be the cause and to make sure other readers also understand that.
I'm pretty sure this isn't "cased closed" from GM's perspective. While it may be frustrating to those that are affected, I'd say patience is a good virtue to have for the time being.
Last edited by jvp; 07-30-2016 at 04:33 PM.
The following 5 users liked this post by jvp:
Along4theRide (08-01-2016),
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#34
Pro
2016 C7 Z51 manual transmission, no mods and last time I was at the track I ended up melting the AFM actuators. I always run a cool down lap at half speed. I've decided to not run the car on the track in the summer months and stick to autocross only until it cools down. Very disappointing that they have a solution but it isn't backwards compatible. Fingers crossed that they come out with a solution for the 2014-2016 C7s.
#35
Pro
#36
CF Old Timer
2016 C7 Z51 manual transmission, no mods and last time I was at the track I ended up melting the AFM actuators. I always run a cool down lap at half speed. I've decided to not run the car on the track in the summer months and stick to autocross only until it cools down. Very disappointing that they have a solution but it isn't backwards compatible. Fingers crossed that they come out with a solution for the 2014-2016 C7s.
The following 3 users liked this post by Along4theRide:
#37
BaylorCorvette - You did nothing wrong. I always do cool down laps also, my failure occurred on the track, you can't very well be in the middle of a session, and stop to do a cool down lap. This *IS* a design issue with the car. As has been stated, it's so much of an issue, they changed the design of the car in 2017. The only thing left to do is form a prayer circle and hope that they don't forget the existing customers who already purchased these cars and are now left with the issue. Hang in there.
Might need to add some chanting to that!
The following 3 users liked this post by descartesfool:
#39
Melting Slicks
Since all GM did on the 2017 M7 is remove the valves it seems like they could just sell current owners a $200 track performance improvement upgrade that removes the valves and retunes the ecu.
#40
Pro