Unexpected acceleration
Le Mans Master
Joined: Aug 2000
Posts: 6,486
Likes: 1,659
From: Las Vegas NV
Try it if you don't believe me. Go to a deserted parking lot. Push the brake pedal as hard as you can (as the OP said he did) and then press the gas as hard as you can. Report back.
Safety Car
Joined: Aug 2012
Posts: 3,960
Likes: 1,106
Burnouts like you describe can't be done with FULL brake pressure -- usually, people use LIGHT brake pressure to keep the car stationary.
Try it if you don't believe me. Go to a deserted parking lot. Push the brake pedal as hard as you can (as the OP said he did) and then press the gas as hard as you can. Report back.
Try it if you don't believe me. Go to a deserted parking lot. Push the brake pedal as hard as you can (as the OP said he did) and then press the gas as hard as you can. Report back.
Both the front and rear brakes are extremely potent on the C7.
Racer
Joined: Feb 2005
Posts: 254
Likes: 2
From: Beachwood (Cleveland) Ohio
Getting back on point - - I, too, am very interested in knowing if the OP's experience is a rare - if even extremely rare - event. And, to shadow his inquiry... has anyone had a similar issue with their C7? Or, know of any other examples? This is profoundly dangerous! And to the OP - please report back on what was discovered as the cause.
Doug
Doug
Melting Slicks
Joined: Aug 2014
Posts: 2,746
Likes: 916
I asked about whether or not he had a dry sump and a recent oil change because my car would hold RPM even with my foot off the gas pedal and in some cases the RPMs would climb with my foot off the pedal. My issue ended up being due to a dry sump oil overfill and oil was getting sucked into the engine. Sounds like slightly different situations in that mine would do it after hitting the accelerator pedal where his account appears to have happened without even touching the pedal. I thought the throttle bodies were designed to fail closed???
Last edited by lakemg; May 3, 2017 at 09:38 PM.
Burning Brakes
Joined: Sep 2014
Posts: 761
Likes: 49
From: Ringwood New Jersey
I have a wide foot/3E, and every so often when I'm braking I'm on both [the brake and gas]. Never happened with any other car I've owned. Have to be careful which shoe's I wear when driving. Hope every thing works out for you...
Pro
Joined: Oct 2016
Posts: 546
Likes: 89
It acted like you were power braking? So the car was completely stopped and the revs climbed? That's what happens during power braking. What your saying makes no sense. The front tires locked up but your say the rear wheels kept pushing you? Only in a bad movie can that happen. Why did you not just press the start button and turn it off?
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Race Director
Joined: May 2008
Posts: 10,742
Likes: 629
From: Manheim Pennsylvania
I have heard of un commanded power application on a Ford where the car exceeded 100 MPH before the operator got the engine shut down with the ignition switch. The dealer could not duplicate the malfunction (?). If the engine speeds up without driver imput, manual transmission operators need only to depress the clutch, automatic operators have to select neutral, then as the engine hits the rev limiter shut it down with the ignition switch. You will not be able to over power the engine by just using the brakes. Just like the OP stated.
You will have to hold the ignition button for a few seconds before the engine will shut down (safety feature when vehicle is in motion [unsafe feature when you needed the engine shut off seconds before you got to select ignition off].
You will have to hold the ignition button for a few seconds before the engine will shut down (safety feature when vehicle is in motion [unsafe feature when you needed the engine shut off seconds before you got to select ignition off].
Last edited by Larry/car; May 4, 2017 at 10:27 AM.
Pro
Joined: Oct 2016
Posts: 546
Likes: 89
I have heard of un commanded power application on a Ford where the car exceeded 100 MPH before the operator got the engine shut down with the ignition switch. The dealer could not duplicate the malfunction (?). If the engine speeds up without driver imput, manual transmission operators need only to depress the clutch, automatic operators have to select neutral, then as the engine hits the rev limiter shut it down with the ignition switch. You will not be able to over power the engine by just using the brakes.
Actually your wrong and it took 5 seconds to search...
http://money.cnn.com/2010/02/17/autos/brake_override/
"Toyota has said it hadn't previously used the technology because some drivers occasionally choose to use both the brake and gas pedals at the same time for certain maneuvers, such as starting the car on a steep incline.
Some automakers, like General Motors, feel it's not needed. GM has technology similar to brake override, but only on cars like the Corvette ZR1 and Cadillac CTS-V, vehicles with engines so powerful they threaten to overwhelm even strong braking.
A GM spokesman said the brakes on most of its cars are strong enough to stop cars even at full throttle. GM specifically tested this with a Pontiac Vibe, a car engineered by Toyota."
Or how about this one that was posted earlier:
http://www.caranddriver.com/features...d-acceleration
Le Mans Master
Joined: May 1999
Posts: 6,516
Likes: 1,303
From: Windermere FL
Gosh that is some scary ****. Never heard of it happening on the C7 before. But having so many decades in computers, I am not surprised that fly-by-wire could do this.
I thought that the car's computer record the last few seconds of data that is available for crash analysis. I would tend to think that perhaps there is some interesting data stored in there? Did the dealer pull it? Or did they erase it?
This happened to me in my supercharged C4 but was caused by my cruise control which was flaky. Me, I threw in neutral before it got outta hand. But the C7 is quite a bit quicker so I guess you got to have quicker reactions on a C7.
I thought that the car's computer record the last few seconds of data that is available for crash analysis. I would tend to think that perhaps there is some interesting data stored in there? Did the dealer pull it? Or did they erase it?
This happened to me in my supercharged C4 but was caused by my cruise control which was flaky. Me, I threw in neutral before it got outta hand. But the C7 is quite a bit quicker so I guess you got to have quicker reactions on a C7.
Last edited by Flame Red; May 4, 2017 at 10:33 AM.
Instructor
Joined: Feb 2016
Posts: 222
Likes: 140
From: St. Marys Ohio
Wow, that is scary, 460 unchecked hp.
It behooves all of us to think through an emergency plan.
Clutch down, auto in N, hit the off switch, easy to say here but more difficult to do in the midst of an emergency.
The off switch is invisible to me in my seating position but I will practice hitting it in scared S... less mode.
I don't recall any mention of a rev limiter on the C7, if not I will chance an engine over
any other outcome.
I do hope that is a 1 of 1 event and we are all not sitting on a launch pad.
All best wishes in getting your car situation back together and your wits as well. Quite an nerving event!
It behooves all of us to think through an emergency plan.
Clutch down, auto in N, hit the off switch, easy to say here but more difficult to do in the midst of an emergency.
The off switch is invisible to me in my seating position but I will practice hitting it in scared S... less mode.
I don't recall any mention of a rev limiter on the C7, if not I will chance an engine over
any other outcome.
I do hope that is a 1 of 1 event and we are all not sitting on a launch pad.
All best wishes in getting your car situation back together and your wits as well. Quite an nerving event!
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 34,950
Likes: 12,363
From: NE South Carolina
That is not disrespectful it is what happened in most of the unintended acceleration cases. I recall 60 minutes who in only a way they can distort the facts, showed preachers wife who ran into her child in front of the garage door and killed her!They were blaming Audi as i recall for peddles spaced too closely! Turns out GM was very quite about the issue because they had many complaints from old folks driving Caddy's in Florida!
Easy to do. (Perhaps an attorney fishing for evidence!
) I had my 2014 since October 2013. Been on the Corvette Forum often since then. Do not recall one post with that issue. Yep the peddles in the M7 are spaced closely, perfectly for heel-toe!PS: GM Attorneys, who are no doubt reading this Thread. I am an expert witness, had >200 hours in a wrongful death suit last year for someone foolishly welding on a gas tank! Paid for my 2017 Grand Sport-well almost. Still waiting for my $2000 Loyalty Rebate that I am not getting because I sold my 2014 the morning I ordered my 2017 Grand Sport! Check out my correspondence on the subject before calling!
😊
Last edited by JerryU; May 4, 2017 at 11:25 AM.
Melting Slicks
Joined: Jan 2017
Posts: 2,982
Likes: 1,039
From: Georgetown CA
2018 Corvette of Year Finalist
2017 C7 of Year Finalist
Air bags deploy? Depending on the impact, there's a good chance they can pull telemetry from the Event Data Recorder (black box on the car) which would identify brake usage, throttle usage, etc. Hopefully they get that data pulled and you can report back at some point what the outcome was.
Pro
Joined: Feb 2002
Posts: 549
Likes: 25
From: Charleston SC
Le Mans Master
Joined: Aug 2000
Posts: 6,486
Likes: 1,659
From: Las Vegas NV
I have heard of un commanded power application on a Ford where the car exceeded 100 MPH before the operator got the engine shut down with the ignition switch. The dealer could not duplicate the malfunction (?). If the engine speeds up without driver imput, manual transmission operators need only to depress the clutch, automatic operators have to select neutral, then as the engine hits the rev limiter shut it down with the ignition switch. You will not be able to over power the engine by just using the brakes.
(snip)
(snip)
If your 500hp engine can overpower the full application of your Corvette-sized brakes, you need to have your brakes checked -- something is definitely very wrong with those brakes.
This situation has the same feel as all those sudden-acceleration claims of the past. After all the investigations, in no case could the engine overpower the brakes.
I'm not attempting to bash the OP, just saying that I (as well as any investigators on any unintended acceleration case I could find published) can determine any reasonable path to the series of events described -- namely, "functional brakes unable to overpower full throttle acceleration". If you have any links to any such evidence to the contrary (anecdotes <> evidence), I would be genuinely very interested to read them.
Possible Explanation: Maybe the OP is stating he had an "unintended acceleration" event AND his brakes failed at the same time? That's the only way I could see it happening.
Last edited by Kent1999; May 4, 2017 at 02:17 PM.