I want to run VEMS in place of an LH & EZF ECU in a 5L Porsche 928.
The car is a Quad cam v8 with:
11-1 comp ratio approx
VR crank position sensor
Hall cam sensor
knock sensors (2)
COP, MAP and wideband O2
24# injectors (sequential injection)
The car is an 86 (32v Euro) with the 86 block and bottom end (with some mods), and the top end from an 88S4 (hence the higher CR). So the engine is effectively an 88. I have opted to use the 60-2 trigger wheel from the 88. History so far is here.. MembersPage/TimEgan/History
1 x LCD4x20
1 x Econoseal 18-Wire
1 x EconoSeal? 36-Wire
1 x Wideband O2 sensor
1 x Wideband O2 connector
1 x Assembled v3.3 controller
The controller checks out OK, so now starting to sort out the sensor/driver connections in preparation of building a new loom. Have decided to use the aircraft grade tefzel wire.
Have just discovered the COP's I intend to use are active, MembersPage/TimEgan/Ignition but have 8 IGBT configured on the controller.
Q: What is the best way to revert back to logic level signal?
- best way is to use stepper outputs to control active cops. We found a VAG COP (the cheapest, most common VAG COP) that has too low input impedance, and outputs weaker spark if driven from i259 output. We don't know if other coils have the same.
- If you can solder, you could unsolder the IGBTs and route short wires from 510 Ohm resistor (pin1) to output (pin2, that is middle pin). The GND pad that goes to the high-fill is left empty.
- adding an 270..510 Ohm piggyback on the top of the onboard 510 Ohm might help with the VAG COP.