vems speed sensor Hz

[A80Avant]

anyone has a known value for this one?

[A80Avant]

http://www.vems.hu/wiki/index.php?page=MembersPage/MarcellGal/PowerAndTraction/SpeedoMeter

this is the only link i have found from some communication arhives that Jamo had.

Jamo, you dont have the speed sensor yet? or have you been using this already?

im going to try 111hz to see.

Error, ill need your input here as well!!

[A80Avant]

my wheel circumference is 1.918. According to Marcel's calculation it brings out as 115Hz the speed sensor calculation.

Now i need to find the minimum period time value...

[A80Avant]

got an answer from Marcel. it appears that it can vary from 0-5ms (or us, i have to clarify that with him) and from my understanding i need a GPS to modify that.

Also he uses a rising method, not (both) on the middle value. Cant remember which one it is, as i dont have vemstune here

[Jamo]

I was told start with 110 hz and 1600 us

[A80Avant]

rising or both?

have you tried it at all?

im going to try it hopefully today.

[A80Avant]

Right, here are the results of my tests today.

anything between 112-114hz works and it is pretty close to the GPS wheel speed.

Problem is that whenever the car accelerates (mostly) the gauge needle on the wheel speedometer jumps up then down before it settles to the proper speed. If speed is maintained for a few moments, then it is ok.

I tried different minimum period times as well as both and rising edge and didnt have any good effect. most of the times it was better with period time close to 400-1600us.

[A80Avant]

Other users confirmed that the speed sensor is erratic. Marc is going to be testing it as well, but Marcel will hopefully try and update it on a later firmware. its a pity that it seems so difficult to correctly adjust this sensor, as it would give fantastic results if we are to use gear depended boost.

[th.b.w.]

Hi,

Car is running since 10 day's, but only 150km of driving....
Some working with idle (1.1.64 to 1.1.81), but now stabile.

I have a quetsion:
Knows someone who can i connect the speessensor signal in the 3b engine ?

S2Central.net told me go to pin 6.
I wondered that there isn't an speedsensor input on pin 6.....
It is Inj. E ?!

In the wire diagramm (S2/3b/till sept.1991) it seems that the speedsensor input is only go to autocheck....


Thanks Thomas

[th.b.w.]

Have set 220 Hz, rising and it is close to the tacho.

But when i accelerate it turns 10-20 km/h down and 5 up....

This is not stable and the gear shows sometimes from 3. to 4. and so.....

Any solutions ?

Thomas

[A80Avant]

as i mentioned. no solution at the moment. i have spoken to Marcell who says that the best numbers to use is 112 and then anything between 4-7ms but i have tried many values between and it doesnt work as expected. So nothing to do now but wait.

[KRIENG]

Can Urs4 use speed sensor ? (1.1.96)
when I take Log Wheel speed change a little

I try set First Speed = 50 Hz/100kph, divider = 1 is it correct ?

What is Second Speed Hz ? should be same as First Speed

[amd is the best]

Any updates on this? I'd love to add wheel speed to my 200 and have gear dependent boost control.

[A80Avant]

I don't think so. Its hit and miss on our cars. At least that is what I have been told. Perhaps easier if you go to 60-2 trigger

[kotnelson]

This is what I used and with GPS was very close at 100 km/hrs








Calculate actual speed from Gear ratio / Tire Size / my tranny is AXM
Vehicle speed (KM/H) = n/iov*UA*0.06
n=Engine Speed (RPM)
iov=overall ratio (iG*iA)
iG=Gear ratio (Driven/Drive)
iA=Final (Axel) ratio (Driven/Drive)
UA=Dynamic rolling circumferences of tire 2*(22/7)*r








Road speed from the log was OK