1988 VW Polo mk2 16V
turbo Digifant I
16VT’s involvement: Modified
the customer supplied Megasquirt v3 MS2, and supplied a
fully functional plug and play G60
loom for a customer in Germany; calibrated fuel,
ignition and
idle
on a local vehicle with similar hardware before shipping out the
loom+ECU.
Chassis: stock;
Forced induction: GT28RS.
Engine: 1800cc, KR engine
code, 16 valve, Audi 20V intake manifold.
Injection: Port
injection, 245cc/min highZ
injectors, Bosch coolant
and Bosch intake temp sensors.
Description: The objective was to replace the Digifant 1 system with the megasquirt. A suitable adapter was made to link the megasquirt to the digifant 1 loom. All stock sensors were used. A V3.0 Megasquirt PCB was used.
Pin configuration:
MS
GROUNDS (8,9,10,11) go to
T25/13, T25/19 (black)
MS SENSOR GROUND (19) goes to T25/6 (black)
MS MAT (20) goes to T25/9 (red/black)
MS CLT (21) goes to T25/10 (yellow)
MS TPS SIGNAL (22) goes to T25/15 (blue)
MS O2 SENSOR SIGNAL (23) goes
to T25/2 (blue)
MS PIN 24 goes to T25/8 (hall
sensor 12V supply via jumper from T25/14) (red)
MS PIN 6 goes
to T25/18 (hall sensor signal
to 4N25 via XG1) (green)
MS TPS Vref
(26) goes to T25/11 (white)
MS FIDLE (30) goes to T25/22 (yellow)
MS INJ1 (32,33) goes to
T25/12 (green)
MS INJ2 (34,35) wired
externally (yellow)
MS IGN (36, using D14 output) goes to T25/25 (brown)
MS FUEL PUMP (37) goes to T25/3 (green)
Options included:
Output 1A (PT6 in megatune) on pin 4 (white) using ZTX450 (rated at
1000mA) and SPR2, currently set as 6000rpm shift light
Switchable maps on pin 5 (blue wire), not hooked up since MS2 1.0.2
does not support input switch
Pin 6 used for hall sensor signal
Pin 25 is freeeeeeeeeee
Pin 27 is freeeeeeeeee
O2 sensor (pin 23) Tee'ed off and brought out as yellow wire for use
with LC-1
Output 2A (PT7 in megatune) on pin 31 (pink) using IAC2B and ZTX450,
currently set to be grounded when MAT>50C
