# HomebuiltRacing

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1. ## Conversion on values received via CAN

Got it, thank you very much! Will test it with ECU later this week. Now need to figure out how to mount it on the car.
2. ## Conversion on values received via CAN

Well, the fragment with the conversion was copy-pasted from this datasheet: https://www.bourns.com/docs/automotive/datasheets/non-contact-steering-angle-sensor-type-6002.pdf I believe this sensor in fact transmits value "N", not signed integer and formula is indeed used to convert it. I also was using Bosch motorsport steering angle sensor document: https://www.bosch-motorsport.com/content/downloads/Raceparts/Resources/pdf/Data Sheet_191153675_Steering_Wheel_Angle_Sensor_LWS.pdf Actual sensor is Bosch part from some Citroen C4 and although everything mostly similar to the info
3. ## Conversion on values received via CAN

Is there a way to convert values that are not exactly linear but change with some logic? Example - I have a Bosch steering angle sensor that transmits position and rotation speed over CAN bus. The conversion as per data sheet for similar sensor (multiplier is a bit different in my case, but logic is the same): Absolute Angle Position: • Signed (integer) • Angle position [degree] = N · 0.1, for 0 < N ≤ 32767 (N - digital value of the message) = (N-65536) · 0.1, for N > 32767 So, for rotation to one side it goes from 65536 and down, and for other side - from 0
4. ## CAN BUS SET UPS ON FRENCH RUBBISH

check out this page if you haven't seen it yet. good chance that all dash related stuff might be there or at least you can find some clues on mapping https://autowp.github.io/
5. ## Ion-sensing w/knock control

Thank you for clarification and your understanding to overexcited beginners like myself Regarding audio knock sensing, can you advise any commonly available knock sensor with good known calibrations to start with? To be an upgrade for 97 Subaru with (fresh) 1-wire sensor? I'm progressing with settings on my setup but I still can't rely on it 100% especially on high rpm where engine becomes noisy. Btw, is there different practical rpm limit for different sensors? Like if newer wideband ones are better in any way? Probably simple solution will be to get external knock box, but in my under
6. ## Ion-sensing w/knock control

From what I read by now there are OEM components these days that output signals that are ready to be used. Like Saab's Trionic 8 system. Ionisation module gets 4 ignition inputs from ECU an 4 inputs from ion sensing coils and generates three digital output signals to the ECU - knock and combustion event signals for cyl 1-3 and 2-4. With ionisation module and separate coils, I assume that this system it already can be used instead of external knock sensing device, for example. I'm not sure if combustion signal is interesting and useful for other things instead of detecting misfires,
7. ## Ion-sensing w/knock control

Just read about this technology and I'm excited. My understanding of the probmems is pretty basic of course, but It seems that it just needs some work work on software side to support certain smart coils / hardware and should be pretty usable. I saw some open source projects experimenting with this quite successfully!
8. ## User defined CAN stream settings

Nope ) That was a bit stupid ))) For 1:1 values you still need M=10, D=1 and O=10000 )
9. ## User defined CAN stream settings

So, everything works as intended, good news! I just was so excited to get it to do something that that I completely missed part of the process and replaced it with my expectations of how it should work Leaving my test sketch aside, considering that I will be using analogRead() in Arduino to get the potentiometers values it it looks like like I will need M=10 and O=1023 to receive 0...1023 raw values. Or take some time and figure out correct values to translate straight to mm of shock travel. Thank you!
10. ## User defined CAN stream settings

Hi! Trying to figure out CAN bus settings to add some extra analog channels to logs. ECU in WRX V1-V2 plugin. I wrote simple sketch for Arduino that sends four values via CAN in two frames of one stream. One value (x) is constantly changing from 0 to 4000 and back and others are x/2, x/4, x/8. Basically these (someday) will be replaces with suspension potentiometers values. I'm new no CAN bus stuff and Arduino, last time I wrote code was about 15 years ago So, sorry.. please bear with me. My CAN stream settings are below, frame 2 is the same but ID is 61 So, my
11. ## Impreza v3-4 Wheel speed

Yes, I understand. Funny enough, VSS wire from speedometer to ECU is also connected to external datalogger and central diff standalone controller, and while diff controller seems to see speed just fine, both ECU and datalogger show noisy signal which does correlate to speed... Attached are screenshots from PC log and from datalogger (together with GPS speed channel). I have v4 speed sensor for gearbox to try wire it directly to ECU, but this means ditching speedo cable and no readings on dash/odometer...
12. ## Impreza v3-4 Wheel speed

Hi! I Have similar question. V2 car with speedo cable, all wired to run on v4 ECU. V4 plugin now. Speed is 0 without pull-up, but with pull-up switched on once car is moving readings are inconsistent and jumping +/- 50 km/h. With previous ECU (OEM v4 with daughterboard) speed readings were correct.
13. ## Choosing ECU for GC8 Subaru

Oh, got it. I just read somewhere in the manual that only some plugin ECUs have the sensor. Maybe I confused it with onboard MAP... Anyway.. good to know! So, this solenoid can be removed.. that's potentially one more pin in OEM header that could have been used... Thank you!
14. ## Choosing ECU for GC8 Subaru

Got car started on new ECU yesterday! Everything went pretty smooth and car started from the first try! Have couple of thoughts on how to re-arrange some of the inputs like. My MAF wire is currently IAT with external pull up and PS signal goes to temp 2 IAT channel.. So, I'll probably move MAF wire to Temp 2 and remove pullup to clean the wiring a bit and use some of the spare DI for PS switch... One thing I couldn't figure out is if there any output for pressure exchange solenoid? I had that whole setup disconnected a while ago, but now before the start I assembled it all together t
15. ## Choosing ECU for GC8 Subaru

Yes, we discussed this with author of the board and it is working the way you said: "If you can send CAN messages to then receive the needed data, you would be able to get all the data you want. The speed data would require one message and you'd get back 4 speed values (assuming you use the 16-bit values which should be fine). For analog data, you can get up to 4 values per message and the same for AFR data (assuming you can use CAN data for it)." From what I've understood, sending CAN requests is possible with 4g+, is it? Or request-reply will introduce more lag and not optimal for
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