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) 

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