Boost Reference

[TurboWh1]

What is the proper way to get the power logger to read and record boost?

 

[EricM]

You need to connect the signal wire (0 to 5v) from a MAP sensor to input #2 on the input module board.
Then in the powerlogger software, you can select the type of MAP sensor you have, so it reads it correctly.

 

[TurboWh1]

You need to connect the signal wire (0 to 5v) from a MAP sensor to input #2 on the input module board.
Then in the powerlogger software, you can select the type of MAP sensor you have, so it reads it correctly.

Finally got around to working on this.... I have signal from green wire at MAP to the #2 on the input board and the powerlogger software set to 3 bar map. Still not functioning. More info about car. I'm running alky control and have tried to even jump the signal to the green wire on factory MAP plug. Also tried hooking back up as stock and it does not work that way either. For some reason the factory boost gauge does not work. That may not matter just thought I'd mention it. I have tapped into the green wire on Alky control system, just a FYI there as maybe that could cause issues.

 

[EricM]

Did you tap into the signal wire from the MAP sensor being used by the alky system?

 

[TurboWh1]

Did you tap into the signal wire from the MAP sensor being used by the alky system?

Yes

 

[EricM]

You’ll have to check the signal wire with a volt meter to see where the problem is. Key on, engine off, the signal will be around 1.5-1.6 volts.

 

[TurboWh1]

Ok, did some testing... I have 4.1 volts or so between the green and grey wires at the factory MAP plug. I checked my other turbo regal and it checks the same. Also tried going between the green wire and negative battery cable. No volts there. On my WH1(car with powerlogger) the factory boost gauge at speedometer does not work, the GN it does. Is there a preferred way to test MAP circuit?

 

[EricM]

In your previous picture, it doesn't look like you are using the factory MAP plug. It looks like you have a separate MAP sensor and plug for your alky system.
Is that correct?

 

[TurboWh1]

In your previous picture, it doesn't look like you are using the factory MAP plug. It looks like you have a separate MAP sensor and plug for your alky system.
Is that correct?

That is correct. The factory MAP is disconnected for the Alky system. I did test the factory MAP plug and that is where I have voltage. Between the green and grey wires only on Factory MAP plug. I created this jumper to the signal thinking it would work but it did not. The wire that attaches to factory plug goes to green wire on Alky system. So basically tying all together, green wire on factory and Alky MAP plugs and that goes to #2 input on powerlogger input board.

 

[EricM]

It sounds like there is a break in the wire that should connect the MAP signal to the powerlogger. You should have 1.5-1.6 volts on the signal wire with key on/engine off.

 

[TurboWh1]

Did some more checking.... I did a continuity test, there is connection between the green wire on Alky MAP plug, factory MAP plug and the #2 input on powerlogger. Here is how I'm testing and what I got. Could I be missing a ground somehow?

 

[TurboWh1]

For reference this is battery voltage on same tool.

 

[EricM]

Not sure what you're testing there.

We need to know if you have around 1.6 volts at the signal wire at the powerlogger with the key on.

 

[EricM]

Here is the signal wire in the pic. You need to tap into that to connect to the powerlogger.

 

[TurboWh1]

Here is the signal wire in the pic. You need to tap into that to connect to the powerlogger.

View attachment 1755

That is the wire I'm tapped into. It's just hidden in the Alky harness. I added the jumper to the Factory MAP plug thinking it would help.

 

[TurboWh1]

Correction... The factory boost gauge does work on this car. Still not recording boost. I think it reads -29.5 on the powerlogger all the time.