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1987 Honda Civic si
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5 Posts
Discussion Starter #1
All JDM Honda models have an artificial 180kph top-speed limit. This limit, existing even on the NSX Type-S, is implemented by Honda via the engine ECU. The following explanation is how the 180kph limit is implemented.

The Vehicle Speed Sensor (VSS) is a device attached to the transmission that measures the car's speed via tracking the number of revolutions of the wheels. The output of a VSS is in either sine wave, square wave or in the form of pulse counts. When the engine ECU detects the car is travelling at 180kph via the VSS signal, it reacts in one of two ways. It will either stop 2 or more injectors or it can cut the ignition (probably intermittently). This reduces engine power output drastically, slowing down the car until its speed drops below 180kph.

In JDM cars, cutting off the VSS signal to the engine ECU can lead to one of three conditions. One is the ECU will just ignore the absence of the VSS signal and continue operating as normal. In another, the engine simply won't start or will die when gear is engaged. The final condition is the ECU program, because it now cannot determine how fast the car is travelling, goes into a backup safe mode in which it runs the engine rich. This unnatural rich mode is undesirable and will actually lead to a slight loss in engine power as well as oil dilution (contamination of engine oil with petrol).

In Hondas, loss of the VSS signal will cause the ECU program to go into the backup safe mode. In addition, it will invoke a trouble code of 17 (for EF8/EF9 CRX/Civic SiR) indicating 'faulty vehicle speed sensor'. In the HPL archives, Doug MacMillion said that cutting off the VSS signal will also stop the ECU from engaging the high cam lobes for the B16A.
 

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ministry of mayhem!
93 honda integra
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it's 65 useful posts. not 65-cut-and-paste-all-over-the-internet posts.
 

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BMX bike
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he wants to cut his vss I think :D
 

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2000 civic 2 door ex
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cool.
 

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BMX bike
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I am thinking about cutting one ear off....... it might get blood all over but I will be able to run faster !
 

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ministry of mayhem!
93 honda integra
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5,673 Posts
Pointless post yes thats why we chip and sockets does aways with the top speed limiter. What are you trying o do here?


whore up to the for sale secttion via useless cut and paste knowledge.
 

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racist-bigot-sexist-homophob
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ministry of mayhem!
93 honda integra
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5,673 Posts
gosh, my job is teh suxors.
 

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68 Camaro
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pst dont tell the mods



new cha thread lol
 

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Poop Sock
wrx & slut rex
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I am thinking about cutting one ear off....... it might get blood all over but I will be able to run faster !
bawhahahahyahahah

gosh, my job is teh suxors
this thread suxors
 

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ministry of mayhem!
93 honda integra
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5,673 Posts
cococknut tree.
 

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1987 Honda Civic si
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Discussion Starter #20
I posted it Because no one has posted anything that explanes what the Speed limiter cut off is or how the Speed limiter cut off works

And why would i want to cut the vss? That would screw up my air/fuel mix and i like my cars working How they're meant to, Not Spitting extra gas into the engine just so it can just be Spat out of the exhaust
 
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