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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


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Old 10-09-2019, 01:37 PM   #1
im2bad4ya
 
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SR20DET tachometer signal drops after 5K

I am having an issue in my SR20DET swap. The engine and everything is fine but when my tachometer reaches 5K RPM it drops to 3K RPM and just kinda bounces around. I have the signal wire of the tach going to pin 30 on the stock 62 ECU (Cam angle sensor - 180 degree signal). Otherwise the tach is fine from 0-5K RPM.

What should I be looking for? Anyone have this problem before?
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Old 10-09-2019, 02:02 PM   #2
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Always used the ecu rpm signal wire from ecu and used a pull up resistor for my tachs.
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Old 10-10-2019, 10:42 AM   #3
OnTheChip
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The tach should be connected to ECU pin #3.
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