how does this exactly work? I see the possiblity of intereing two values...

 

Hysteresis.

 

What is tha supposed to mean - that you were born knowing it all?

 

Type it into google. The first link gives you this under electronics and describes it better than I could:

"Hysteresis can be used to filter signals so that the output reacts slowly by taking recent history into account. For example, a thermostat controlling a heater may turn the heater on when the temperature drops below A degrees, but not turn it off until the temperature rises above B degrees. Thus the on/off output of the thermostat to the heater when the temperature is between A and B depends on the history of the temperature. This prevents rapid switching on and off as the temperature drifts around the set point."

 

Searching this site gives more links:

https://www.evolutionm.net/forums/sh...ght=hysteresis

https://www.evolutionm.net/forums/sh...ght=hysteresis

I can waffle on all day if you like, but the single word hysteresis describes exactly what it is.

 

Thank you for the reference material:


What I mean by hysteresis, is like the speed limiter, IC spray coolant temp etc there is a dead zone where the value doesn't switch, this stops oscillation when you're near the trigger value. So as the revs increase it won't turn on until it reaches the higher value, and then it won't turn off going down the revs until it is below the lower value

 

so based on the table:

ON : 110MPH <-- will kick in at 120 and cut whatevet it cuts out until..
OFF : 105MPH <--- I reach this speed again

So I guess the ON and OFF are not a push swich as I thought? Please correct me if I am wrong

 

You are correct. Sometimes the ECU program code has hysteresis on items like this, but in standard form doesn't use it because the values are set the same.

There is a special complication in different countries - for example in the UK the cars are JDM based with everything in km/h but have a mph converter. So for example a JDM limiter of 180km/h becomes 180mph which with our aero and drivetrain losses might be tricky to reach on the standard turbo.

Most people just set the values high enough that they don't worry them... but no doubt it might become a target for some sort of valet mode in future.

I suppose the last thing you want is instability at high speed from a bouncy speed limiter. I've not crashed into the Evo's one, but German stuff at 155mph (often higher indicated) is smooth as you'd expect.

 

great thanks !

 

My stock speed limiter is set to 510 km/hr in both fields. This was stock, is that normal?

 

yeah so was mine, I guess Evos "dont have" a limit from what I was told.
I just want this feature so I dont kill my self when I drive tired late at night or for when my g/f takes the car to the shopping market (IF she takes it ) haha