Hi guys,

Recently I bought an Adaptronic Select ECU (Piggy back) and installed in my car (RX8).
I found that the Adaptronic can't read the vehicle speed sensor as the RX8 uses CAN and the piggy back doesnt support (weird that they didn't implement that). This data was confirmed by Adaptronic.

So, I'm wondering which other alternatives I have to send the vehicle speed to the Adaptronic?

I thought to split the Vehicle speed sensor cable and connect them straight to the Adaptronic.
Another option could be to read the speed value from the OBD2 with Arduino and convert the value to VSS signal (but I still need to research this).

Hopefully someone already passed for this and found a solution... I would love to use the Launch control and boost by gear feature

Thanks guys!!

 

Likely the digital inputs cant handle high enough frequencies to read the sensors without a lot of conditioning.

Also you don't want to split off the signals... there will be too much interference and there will be issues

 

You need the newer Adaptronic modular ecu instead for that purpose, but good luck just the same.

 

Perharps it may work, I contacted Adaptronic and they said:
Ecu needs to see frequency type speed signal, it can be digital or reluctor type.
So, maybe is worth to take a try?

 

In the worst care I could switch off the Launch control via Digital Output when my Arduino detects speed higher than X (it already gets data from OBD)

But the ideal solution is if the ECU will see the real speed so, that I can use all features...

I'm slowly investing it, hopefully this will help other members with the ECU

 

In the worst case I could switch the launch control off via the digital output when Arduino detects a speed higher than X.

However, the ideal solution would be to read the proper speed, so, that I can keep the original features of the ECU working.

I'm gonna keep investigating this... Hopefully it will be useful for others members with the same ECU

 

I don't think manual RX8s have a dedicated vehicle speed sensor. Speed is read through the ABS sensors at each wheel, that's why the ECU receives speed from the ABS/STM system via canbus.


You're probably on the right track with an Arduino though, you could get a CAN shield, read speed from there and output it as a linear voltage signal to the Adaptronic, if it's OK with such an input. Latency through the Arduino could get a little weird though...

Can you build your own reluctor setup off one of the axles, or even intercept the ABS sensor's reluctor signal before the ABS module?

Also, Team is right, surely in 2019 Adaptronic offers a CAN reader module?

 

If you are looking for wheel speed signals they are on the CAN bus. I have the address someplace if you can't find it.

 

I see, didn't know it doesn't have the VSS.

Actually I'm using the Arduino term to make it easier for people to understand but it will be an ESP32 (2 cores with wifi and BLE), so, not much wiring needed.

Ok, I'm gonna take a look how to generate that linear voltage signal and try to plug it into the ECU, if it doesnt work, next step is to intercept the signal from the ABS.

Do you think that the signal from the ABS needs some processing before being sent to the ECU or I could plug it right away?



Yeah, the new Adaptronic ECU reads CAN, unfortunately I just recently bought the piggy back :') so, perhaps after finishing the whole turbo setup I'm gonna invest into a newer ECU.

 

I would appreciate if you could share it

 

The signal goes to the dash display internal mini computer which then translates the signal to the pcm via the CANBus.