MembersPage/PeteLeh

Porsche 944 turbo/Injector & Flyback ? (v3.x serialnr 731)

Due to engine failure, I had to build a new one. Found 3.0 litre 16valve Porsche 968 engine as a starting point.

Now with Carillo rods, original forged pistons, cometic 3,2 mm headgasket, wich brings C/R down to 9,5.

Garrett GT35/82R turbo.

Engine harnes has been built out of original 968 wire harnes, each injector have own wire.

Bosch wasted spark coil pack from VEMS shop.

Racetronix high Z 846cc/min injectors.

Trigger

Porsche 944 turbo trigger:

132teeth on flywheel -VR sensor

Crank home (1 pin on flywheel 24.5 tooth, ie 66.8 dec BTDC 24.5 x 2.7272 deg, if i remember right) -VR sensor.

No cam sensor

And no missing teeth anywhere!

Ignition sequence: 1-3-4-2

I.e. trigger is 132+1


VEMS: serianro 731

Power flyback

300kpa MAP

LCD&PS2

4ign Driver

Firmware 1.1.47

Have tried couple of times to start the engine, without success.

Fuel pressure ok, I get some burning, in combustion chambers, but the engine do not want to start.


Wiring has been done by using Porsche 968 engine wire harness, wich is connected to porsche 944 Turbo Engine bay and cabin connectors (very straight forward). Motronic 55 pin connector has been cut away and wires connected to EC 36 and EC 18 connectors. Few extra wires had to put. ( When I ordered VEMS the plans were others, so I did not order it with 55 pin Motronic connector)

Here is schematic of EC connectors with corresponding DME PIN.s

EC 36/ Wire colour/ Object/ DME pin/ Other

1 Gn/Re TPS signal 26 DME Maf sens wir

2 Gr/Bl IAT 33 Tank ventvalv Wi

3

4

5 GND

6 Bk/Wt ICV close 22 Flyback Diod

7 Gr/Bk Inj.1 17

8 Gr Inj.3 35

9 Boost ctrl Flyback Diod

10 Re/Bl Gn/Bl Tacho 6 22Ohm+220uH

11

12

13

14 Ye Clt sensor 47

15 Fuel pump relay ground

16

17 Re/Bl ICV open 4 Flyback Diod

18 Bl/Re Variocam 23 Flyback Diod

19 Gn/Re Inj.2 16

20 Gr/Bl Inj.4 35

21 GND

22

23

24 GND

25 Re/Gn Re/Ye Power 37 Fuse Box

26 GND

27 Br Speed sens 27 Pin 1 Connector

28

29 Ye/Re TPS +5V(1) 25 DME Maf sensor wire

30

31

32

33

34 Br/Ye Coil Pack1 New wire

35

36 Ye Coil Pack 2 New wire

EC18/ Wire colour/ Object/ DME pin/ Other

1 Wt Knoc sens 1 11

2 Shield Knock sens

3 Wt knock sens2 29

4

5

6

7 Br WBO2/5

8

9 Gn/Re WBO2/6

10

11

12 Br Ref sens DME 26 Pin 1 connector

13 Bl/Gr WBO2/1

14 DSUB3

15 DSUB2

16

17

18 Ye/Re WBO2/4