Got a good deal on a volvo 740 turbo,
current modifications
Only a larger intercooler from a 850R
estimated power 220-240 hp
TODO:
Get a stock ECU that fits the connector, and kill it to make an adapter harness
Trigger is a auditrigger-style, counting the starter gear and a crankhome pin. No hall sensor
This seems to be supported by InputTrigger/AudiTrigger configuration, with changed another_trigger_tooth (but same tooth_wheel settings)
- Four cylinder engine
- fire order : 1342 (I assume)
- 142 teeth on the starter gear
- which means the processor sees 284=4*71 primary trigger pulses for each secondary trigger pulse
- another_trigger_tooth=47 (decimal 71). this is the big difference compared to the 135 tooth auditrigger config
- tooth_wheel=87 (decimal 135). one would think that tooth_wheel=8e (decimal 142) is right, but this variable is only used to activate the auditrigger-style trigger processing. So use the same as for auditrigger
- crankhome signal 62 dbtdc cyl 1 (?)
- write about the cam-HALL polarity. Might require some measurements,
- since some HALL sensors pull down their outputs to GND when they see ferromagnetic metal in the shutter => higher magnetism (such as B field > 6 milliTesla). This is common for unipolar sensors.
- other HALL sensors (such as the factory audi HALL that goes with the 135-tooth engine) pulls down the output when it sees air
Ignition outputs and settings
wasted spark or 4 COP coils ?
If wasted spark, the ignition does NOT require to mask out every 2nd crankhome VR with the cam-HALL.
- rethink the
- trigger_tooth (I expect that this will be decimal 69 = 0x45 or so, 1 tooth after the crankhome pulse detected - yes, unlike the normall missing tooth setup, for auditrigger the tooth counter counts down for efficiency)
- ign_tdcdelay=78 (decimal 120, that is 60 degrees; slightly lower will work too...). Because the cyl number is even, this is regardless if the crankhome signal is seen 62btdc cyl1 or 62btdc cyl4.
- and h[2]=... no surprise here. Just work out if crankhome-VR is seen 62btdc cyl1 or cyl4