SR20DET tachometer signal drops after 5K - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

im2bad4ya · 10-09-2019, 01:37 PM

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?

S14rebuild · 10-09-2019, 02:02 PM

Always used the ecu rpm signal wire from ecu and used a pull up resistor for my tachs.

OnTheChip · 10-10-2019, 10:42 AM

The tach should be connected to ECU pin #3.

10-09-2019, 01:37 PM	#1
im2bad4ya Join Date: Sep 2016 Location: Jersey City Posts: 13 Trader Rating: (0) Feedback Score: 0 reviews	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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10-09-2019, 02:02 PM	#2
S14rebuild BANNED Join Date: May 2019 Location: Florida-FAIL Posts: 2,497 Trader Rating: (8) Feedback Score: 8 reviews	Always used the ecu rpm signal wire from ecu and used a pull up resistor for my tachs.

10-10-2019, 10:42 AM	#3
OnTheChip Zilvia Junkie Join Date: May 2013 Location: Burgaw, NC Posts: 311 Trader Rating: (0) Feedback Score: 0 reviews	The tach should be connected to ECU pin #3. __________________ NismotronicSA - Speed-Density Tuning for Nissans