 Hitting the Speed Limiter, What happens when you do? |
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 Jul 16, 2014 - 8:51 AM
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Enthusiast  Joined Sep 9, '08 From Jamaica Currently Offline Reputation: 1 (100%)  |
This morning I lost a race to this Audi S5 on my local track....now i never normally track my car and my speedo doesnt work. So we take off and my car pulls way off, top of 5th now and randomly it feels like my car shut off....so naturally i look down and the car is still on, just not responding to anything....i let go the accel and after a while the car seems to "start back up" and no check light, afr, boost (vacuum 21-22 in gear and 18-19 neutral) , oil and fuel pressure gauges read normal....temps normal and tank full of gas.....now i assume i hit the speed cut...cant tell how fast i was goin cause the speedo....
So....is that stuff what happens when you hit it?? This post has been edited by Island_Racer: Jul 16, 2014 - 12:49 PM |
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Jul 16, 2014 - 10:20 AM
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 Enthusiast Joined Apr 24, '13 From Tomball, TX Currently Offline Reputation: 3 (100%) |
I didn't know there was a limiter on our cars.
-------------------- "As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men." -Prof. Farnsworth
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Jul 16, 2014 - 12:29 PM
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 Moderator Joined Jun 29, '08 From Denver Currently Offline Reputation: 59 (100%) |
You mean you hit the speed limiter on a track, right?
-------------------- "Employ your time in improving yourself by other men's writings, so that you shall gain easily what others labored hard for." -Socrates. Even Socrates told us to use the search button!
 2006 Aston Martin V8 Vantage. 1998 Celica GT- BEAMS Swapped. 2022 4Runner TRD Off Road Prenium. 2021 GMC Sierra AT4. |
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Jul 16, 2014 - 12:43 PM
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 Enthusiast Joined Aug 4, '06 From Chicagoland Currently Offline Reputation: 9 (100%) |
That sounds like speed cut. The ecu will cut the ignition until the speed drops back off and once you are under the limiter, the car will operate like normal again.
Similar things happen when you hit boost cut. -------------------- ~bloodMoney
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Jul 16, 2014 - 12:49 PM
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Enthusiast Joined Sep 9, '08 From Jamaica Currently Offline Reputation: 1 (100%) |
QUOTE (richee3 @ Jul 16, 2014 - 1:29 PM)  You mean you hit the speed limiter on a track, right? yup...slip of the fingers... so for real though, is that what i experienced because i do my own mechanical work and this had me confused....but im sure it is. This post has been edited by Island_Racer: Jul 16, 2014 - 12:50 PM |
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Jul 16, 2014 - 12:53 PM
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Enthusiast Joined Sep 9, '08 From Jamaica Currently Offline Reputation: 1 (100%) |
QUOTE (bloodMoney @ Jul 16, 2014 - 1:43 PM) That sounds like speed cut. The ecu will cut the ignition until the speed drops back off and once you are under the limiter, the car will operate like normal again. Similar things happen when you hit boost cut. definitely wasnt boost cut....was doing 16psi.....and st205 is about 18... |
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Jul 16, 2014 - 2:01 PM
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 Enthusiast Joined Feb 23, '12 From Warrior, AL Currently Offline Reputation: 0 (0%) |
I sent you a pm when the thread was locked explaining the cause.
-------------------- 2001 Miata LS 5-speed
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