Rpm Pick up Question - Nissan 350Z Forum, Nissan 370Z Tech Forums
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post #1 of 6 (permalink) Old 01-23-2009, 10:59 PM Thread Starter
 
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hello all,

I just got in the mail the innovate LC-1 plus & SSI-4 that i orderd. i'm planning on data logging my A/f ratio and RPM. the thing i dont know is where do i pick up the RPM?

Thanks,

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post #2 of 6 (permalink) Old 01-24-2009, 03:20 PM Thread Starter
 
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Any help?

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post #3 of 6 (permalink) Old 01-25-2009, 09:05 AM
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The ECU doesn't process an RPM signal you would have to get an RPM adapter to connect to the 6 ignition wires from the ECU to get the RPM signal.

Another option is probably the little white box behind the AC controls, that box process all of the signals that go to the gauge cluster, I have picked up vehicle speed from there to use on the Fcon so I am sure you can pick up rpm there as well

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post #4 of 6 (permalink) Old 01-25-2009, 06:02 PM
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QUOTE (westpak @ Jan 25 2009, 07:05 AM)
Quote:
The ECU doesn't process an RPM signal you would have to get an RPM adapter to connect to the 6 ignition wires from the ECU to get the RPM signal.

Another option is probably the little white box behind the AC controls, that box process all of the signals that go to the gauge cluster, I have picked up vehicle speed from there to use on the Fcon so I am sure you can pick up rpm there as well
Tapping one of the ignition wires from the ECU is your best bet. The Unified Meter and A/C Amp, behind the A/C controls, sends rpm to the Combination Meters (speedo, tach, etc.) as a digital word on a communication link. There is no true rpm signal as such.

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post #5 of 6 (permalink) Old 01-29-2009, 02:58 PM Thread Starter
 
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This might sound like a stupid question but is the crank speed the same as RPM?
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post #6 of 6 (permalink) Old 01-30-2009, 02:56 PM
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Aloha,
The simple answer is yes.
However, the signal may be different from what you can use for an RPM signal.

In the "old days, we connected the tach lead to the distributor tach lead or coil output and you cut, or removed wires to set them for the correct cylinder count.

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