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tachometer wiring question


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#1 SR20DET280Z

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Posted 09 August 2014 - 10:26 AM

OK, I have my SR20DET powered 280z back out.  I had it parked for about 5 years and built it more than 10 years ago.  It is an SR20DET with a GT2871r with an Apexi Power FC Djetro ecu and other upgrades.  I daily drive it at 21 psi.  

 

My problem is that I keep slamming into the rev limiter in first gear because I do not have a tach.  I need a tach.  I need to be able to switch gears before I slam the rev limiter, not after.  

 

Where do I get the tach signal?  Is there a tach that is easy to install?  Is there an output on the PowerFC that would connect directly to the tach? 

 

What's the easiest way to connect a tech without having to splice into my splitfire coilpacks???

 

Thank you for the help.  



#2 NewZed

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Posted 09 August 2014 - 10:46 AM

How can you do all of this - SR20DET with a GT2871r with an Apexi Power FC Djetro ecu and other upgrades. 

 

But not know this - Where do I get the tach signal?  Is there a tach that is easy to install?  Is there an output on the PowerFC that would connect directly to the tach? 

 

Just curious as to how these things happen.  I think that the stock 280Z tach counts six coil discharges as one revolution.  So you'll have the signal problem to solve and the math problem of making four look like six.

 

 

These adapters look interesting - 

 

http://www.summitrac...ometer-adapters

 

http://www.dakotadig...=127/prd127.htm

 

http://www.dakotadig.../pdf/SGI-8B.PDF


Edited by NewZed, 09 August 2014 - 11:22 AM.


#3 SR20DET280Z

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Posted 09 August 2014 - 05:51 PM

Just curious as to how these things happen.  I think that the stock 280Z tach counts six coil discharges as one revolution.  So you'll have the signal problem to solve and the math problem of making four look like six.

 

 

These adapters look interesting - 

 

http://www.summitrac...ometer-adapters

 

http://www.dakotadig...=127/prd127.htm

 

http://www.dakotadig.../pdf/SGI-8B.PDF

Yeah, I built this more than 10 years ago.  I haven't changed much.  It has been parked for 5 years.  I have slept in the last 10 years and have forgotten everything I learned.  Make sense now?  My build is pretty documented on here.  I was probably the only SR20DET in the midwest.  



#4 SR20DET280Z

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Posted 09 August 2014 - 05:54 PM

By the way, my car is from Bend Oregon, originally.



#5 logr

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Posted 10 August 2014 - 05:39 PM

A Power FC would have the stock signal coming out of the SR ecu connector. You can use it to trigger an MSD adapter for a coil signal to run a 280Z tach which is adjustable to match the 4 banger speed. Get a KADE tach to have something to match yours to for accuracy.

 

It is what I have in mine BUT

 

I don't know how the split-fires work.  If you don't have an igniter, I don't know if the signal would still be there or not.

 

It should be the yellow/ red stripe wire for the tach signal.


Edited by logr, 10 August 2014 - 05:42 PM.

It's not the length of your crank that counts, it's the power of your stroke.


#6 CasperIV

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Posted 11 August 2014 - 12:16 PM

Personally for my build I just went with a 10k SpeedHut tach. The adapters people have mentioned already have worked for others, I just decided to go with new gauges anyway, so I figured I would get a tach that was adjustable and had head room depending on what kind of build I do in the future.


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#7 69sroadster

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Posted 14 August 2014 - 05:11 PM

You could get a JDM aftermarket tach for an SR, try to use your Apexi to display RPM, or use a USDM aftermarket tach + converter, or try to get an adapter that will convert to what the L series put out to the factory tach.  I already had the Autometer tach so I got the converter to get that working with the stock SR20 coil harness.  It was pretty easy in the end.


If you're not breaking things then you're probably not having enough fun.
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1969 2000 Roadster future project




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