1986 BMW 325i Race
car 2
16VT’s involvement: Wired
in fully functional Megasquirt ECU using bespoke harness; calibrated
fuel and spark.
Chassis: coilovers;
Forced induction: none.
Engine: 2500cc, M20B25 engine
code, 12 valve, schrick camshaft.
Injection: Port
injection, custom intake manifold, custom wiring harness, 60-2 trigger
wheel, VR crank sensor, Bosch coolant and GM intake temp sensors, 3
Audi coils driven by VB921's;
Description: The
objective of this install was to eliminate the stock airflow meter and
convert to waste spark ignition.. 3 wires were run externally from the
Megasquirt to the 3 Audi coils.
A v3 PCB was used, 3 VB921's for waste-spark capability, and a few
PN2222A transistors for some 'extras'.
Pin configuration:
MS VR- CRANK SENSOR SIGNAL (7)
MS GROUNDS (8,9,10,11,12,13)
MS SENSOR GROUND (19)
MS MAT (20)
MS CLT (21)
MS TPS SIGNAL (22)
MS O2 SENSOR SIGNAL (23)
MS VR+ CRANK SENSOR SIGNAL (24)
MS SPARE PIN (25) goes to drive coil B externally wired
MS TPS Vref (26)
MS +12V (28 )
MS SPARE PIN (29) goes to drive cluster tachometer
MS FIDLE (30)
MS INJ1 (32,33)
MS INJ2 (34,35)
MS coil A control (36)
MS FUEL PUMP (37)
The 'extras':
Launch control, JS11 - SPR1, pin 3 (yellow)
Nitrous, JS1 - SPR2 (pink)
Switchable maps, SPR3, pin 5 (blue)
SPR4, pin 6 is freeeeeeeeeeeee
Coil B IAC1A, pin 25 (blue)
Coil C IAC1B, pin 27 (green)
Tacho out, JS0 - IAC2A, pin 29
Output2, JS3 - IAC2B, pin 31 (red)
