Members Page/Jimmie J - VEMS wiki www.vems.hu

MembersPage/JimmieJ (2006-07-10 19:07:38)

Introduction

I am planning to install VEMS on a Fiat/Lancia 5 cyl. 2l 20V engine. Since I have no previous experience with engine management the time frame for this project is pretty much unlimited.

Some data on the engine:

5 cylinder, 1998cc, 20V, turbocharged
Firing order: 1-2-4-5-3
OEM ECU is a Bosch Motronic M 2.10.4 with a 58+2 (60-2) missing tooth trigger wheel. [1][2]
- VR sensor
Stock injection timing sensor is a Hall effect sensor, reading off the exhaust camshaft.[3][4]
Coil-on-plug setup.[5][6]
- Passive coils.
Fiat VVT, simple variable valve timing system.[7][8]

From what I can tell (which isn't alot) all sensors needed by VEMS is already there (except MAP sensor). Problem seems to be to figure out if they can be used.

Since almost all components are made by Bosch, there shouldn't be any problem with these sensors

High impedance Bosch injectors (std) rated at about 330cc/min@3 bar.

Questions

Logic-level outputs (which are 03 and 05 by default in the 6+2 setup) cannot drive passive coils ! Use power outputs to drive passive coils
- eg. h[2]=06 04 02 01 00 05 05 05 (ignition sequence) can be configured (to fire igndrive 0, 1, 2, 4 and 6 respectively), and wire transformers accordingly. See InputTrigger/AudiTrigger for more info on the cyl fire order (which is 360 degree rotated, not 62 BTDC as you might think!)
- ignchmax=04 # nr. of coils -1

How can I tell what sort of crank trigger sensor is used. The manual only states part no. which havn't helped me alot.
- measure Ohm with DVM. Any combination of pins, in both directions. DVM Diode mode can help too.
- MembersPage/PhatBob - Looking at the trigger wheel info [1] it shows a method to test the resistance (774 - 846 @20degC) and shows a coil in the schematic. This is a VR sensor.
OEM coil-on-plug setup can most likely be used. Is there a way to find out if they are "active" or not?
- measure Ohm with DVM. Any combination of pins, in both directions. DVM Diode mode can help too.
- MembersPage/PhatBob - The coils shown in [5]are passive coils with a 0.4 ohm primary coil, these will draw ~30A@12V

MembersPage/PhatBob - For the VVT looking at [8] you will need to measure the resistence across the solanoid (1) in the picture, I see that the Motronic ECU drives these through a series of relays, depending on the current draw it may be possible to drive the VVT directly by one of the spare High Current outputs.

MembersPage/EmilMalmsten/AudiS/OldPage is a 5cyl that was running on 60-2 (+ camsync, of course) earlier, before it was converted to InputTrigger/AudiTrigger.