Jonas Olhssons BMW 1602
Engine specification
- BMW M10, 2.0 litre crank, stock rods and Mahle forged pistons
- Schrick cam shaft (300+ degrees duration)
- Individual Throttle Bodies
- Ford Motorsport 1600 cc fuel injectors, 5 Ohm impedance
- BMW Coil-on-Plug from S38 engine (coils mounted on firewall)
- Simple type, Honeywell GT1 Hall-sensor on crank and cam
Q: Can the Genboard v3.4 support two Honeywell GT1 sensors (fed from pin 28 +5V) ?
- you experienced voltage falling below +4.5V ? Typical 10mA (max 20mA) x 2 should be handled by output without voltage falling under 4.8V
- In fact Emil Larsson wired 2 sensors (on the alfa romeo V6) on pin 28 using a v3.3 board, worked properly, Used a soldered junction in engine bay.
- are you sure using EC36pin28 ? stay away from pin 29 !
- what is the measured current draw of your honey ?
Q: Can they be wired to +12V (same fuse as the Genboard) with no ill effects?
- The datasheet allows this
- The +12V can have spikes (related to alternator charge-control, and/or starting aid). It might be a good idea to have [18V throughole transient diode] in the wiring to protect the sensor.
- or WebShop can give you small mapboard (sensors, 400kPa MAP sensors) "bare pack" with 5V regulator installed (with caps, and transient diodes) that protects the sensor from transients
Q: In addition to the two Hall sensors we will be using three switches with 2.7 KOhm resistors as pull-ups to EC36-pin28 according to MembersPage/PhatBob/UserGuide. That's 2 mA per switch if all are active and a theoretical max of 50 mA current draw from the switches and Hall sensors. Is there anything to worry about in using EC36-pin28 for all these purposes?