well after a few weeks of testing, i've resorted to posting my issue here
i've been using the speed input since it was introduced with varying degrees of success. I'm using the ps/2 wiring from the vems store. it is getting its input signal from a dakota digital speedo converter. this takes my VR wheel sensor, calibrates it and outputs a pulse wave to work with my stock e30 speedo.
i've noticed the newer firmware does away with the min pulse setting - older firmware seemed to have less noise for me.
the noise only appears under boost. i did a number of things, which i thought could be contributing.
- disabled racelogic traction control
- turned off map based dwell (thought maybe it was overcharging)
- went from 208hz and 1 divider, to 52 and 4 divider
I'm inches away from doing a dedicated hall sensor on the driveshaft, however i noticed something else strange...
i graphed speed input #2. this also shows the exact same noise!
i'm not sure where it could be coming from or what input #2 uses?
any ideas? at this point, i don't think the dedicated sensor will work
sorry for the large image