Opethmike Z7U manifold custom conversion

[opethmike]

Today's work:

Installed wide band oxygen sensor
Installed relay board
Installed ECU + MAP sensor vacuum line

Tomorrow's work:

Run power and ground to relay board
Connect all wires to relay board
Load a 'good' base tune to ECU
Calibrate TPS
Calibrate ground switch for vacuum solenoid + idle speed motor
Try to get car to run

PS, are you still using a microswitch to disable the vacuum advance at idle? If not, you are letting manifold vacuum through to the advance, thus making it very difficult to start and being too advanced at idle. Vacuum advance should only start to kick in with load and then fades away once you approach atmospheric. By then the RPMs are up and centrifugal takes over.

I do not have the microswitch installed, but I am doing what Jim Reeve does - I am tapping the FIdle output of the relay board into the ground wire for the vacuum advance solenoid + idle speed motor. I have the ECU set so that it will provide ground when the throttle position sensor is below a certain point.

[Bitsyncmaster]

I do not have the microswitch installed, but I am doing what Jim Reeve does - I am tapping the FIdle output of the relay board into the ground wire for the vacuum advance solenoid + idle speed motor. I have the ECU set so that it will provide ground when the throttle position sensor is below a certain point.

I would just pull the advance hose off and plug it untill you get the engine running. That way you know you don't have advance when starting the car.

[opethmike]

I would just pull the advance hose off and plug it untill you get the engine running. That way you know you don't have advance when starting the car.

Thanks, that's a great idea.

[opethmike]

)@(#$)@#*$

Having issues communicating with the ECU, as per attached photo.

[AdmiralSenn]

What's your setup? Standard serial port, usb to serial converter, operating system? How do you have the serial port set up in Windows and the tuning software?

[opethmike]

Turned out it was a serial driver issue. Uninstalled and re-installed, and now communicates fine. Very strange, but hey, it works now.

[opethmike]

Found a set of six high impedance injectors for $200, so I decided to order them. Since high impedance injectors are a single set it and forget it configuration, getting them should make things easier.

[Bitsyncmaster]

Found a set of six high impedance injectors for $200, so I decided to order them. Since high impedance injectors are a single set it and forget it configuration, getting them should make things easier.

So why would anyone want low impedance (higher power) injectors? Do they work faster so are for high RPM engines?

[opethmike]

I really don't know, but most older cars have lower impedance injectors. I think its a legacy thing at this point.

[Spittybug]

The high impedance ones are easier to set up in MS, both code wise and hardware wise (no flyback circuit to wire up). Good move I think.

So did you try to fire it up?