Haltech PS1000/COP's/Tacho Signal/NA Cluster

[Magpie]

Looking for some info/help on getting the tacho on the NA cluster to work with the signal from the Haltech PS1000. The engine has COP's.

The Haltech signal can drive a shift light, plus the RPM signal is being seen by the data logger (however it is not reading the correct RPM).

[koop21]

I don't have a haltech 1000, but a 500. Looking at the wiring diagram the 1000 doesn't not have a dedicated tach output wire like the 500. However I believe this is because you can decide what the output would be.

So you will need to wire either pin 1,18 or 23 to the stock igniter (blue/yellow wire) and configure it in the haltech. Once you have that working you can then wiring a shift light


*this is my opinion and I do not have any experience with the 1000, but the above worked for my 500.

[sailaholic]

Stock ignitor dosent exist due to cops in guessing.

Link the trigger wire from the cops to your tach output. However if you have ignition cut at any point your tach will read the cut ignition values.

Better is to connect an output from the haltec capable of a tach output to the tach wire in the stock loom

Sent from my GT-I9100 using Tapatalk

[koop21]

Wrong.
You do need to wire the tach output from the haltech to the stock ignitor wiring because the blue/yellow wire is what displays your revs on your dash. As for the tach output from the COPS i believe its not required as your 1000 should be able to calculate the revs and transmits the signal to whatever DPO you select.

[Magpie]

Thanks for the feedback. After discussions with Jason (MX5 Plus) the exact same setup worked for Charlie's car but there is something different with mine. However the tacho still does not work.

The Haltech's RPM output puts out 2.3v however the NA6 cluster needs a -12 volt pulse to read the RPM. Since I still have a stock NA6 at home I'll put an oscilliscope on the Tach wire and confirm the -12 volt pulse and then compare it to the Haltech's RPM pulse. Hopefully I can then find an electrical type person to build a black box that takes the Haltech's signal and coverts it to a signal suitable for the NA6 stock dash.

As a stop gap measure a small tacho is being used, however a long term solution is needed. It may end up that a IQ3 or similar dash is installed, however the idiot lights and indicators etc will need to be wired up seperatley, if the car remains road registered. This is getting frustrating, however I do thank Jason (and the others at MX5 Plus) for finding where the problem is.

Edit - finally I may have found a solution. Haltech have a wiring diagram for driving a tacho the requires a negative trigger http://www.haltech.com/wp-content/uploads/2013/07/Relay-Wiring-for-Tacho-Output1.pdf all I need to do confirm the stock NA6's -12 volt pulse.

[sailaholic]

That's sounds rubbish. What's the point of a tach output that's not 12 volt.

Why not just use the trigger signal from the cops seeing as they are 12 volt.


Sent from my iPhone using Tapatalk

[Magpie]

Sailaholic I will confirm when I am home, the issue is both +12 volt and the -12 volt pulse that drives the tacho. I need to confirm that the Haltech is giving -12 volt and since they have a solution then it is a know problem for tacos that need a -12 volt pulse.

Once I knew the question Google showed that this is common among other cars.

I could go off the coils however there should be a simple solution that can go under the dash.

[sailaholic]

Going off the coils should be neat under dash solution as it should only require connecting the tach wire in the harness to the tach/trigger wire to the coil.


Sent from my iPhone using Tapatalk

[Magpie]

Well after a little investigation it would appear that the internet does not have all the right answers....

This is the wave from a stock NA6 that I have at home. It has a 14v peak and it is not a square wave. The frequency works out to 846 RPM and a pulse width of 35.44ms. The pulse was taken from the diagnostic port.


Now to the Haltech. It was set at 5V and gave this (1,086 RPM and pulse width of 31.24ms).


The Haltech set to 12V output gave this (960.3 RPM and a pulse width of 27.76ms).


The issue would appear that the Haltech is not putting out the required 14V to drive the tacho. However I'm not an electrical type person and the only obvious difference is that the stock has a rectangular wave and the Haltech puts out a square wave. The issue could also be the wave shape as well as not sufficient voltage.

I have access to a voltage signal generator so the plan will be to duplicate the stock NA6 tacho signal and feed it to my dash to see if the cluster is the issue.

Any suggestions would be appreciated, please?

[plohl]

You can't just wire from the cops to the tacho wire on the stock loom? The blue/yellow one iirc on the igniter?

Sent from my SM-N9005 using Tapatalk

[Magpie]

Plohl, this post is going to hurt... The Haltech has the option to invert the signal and when this is ticked and 12V is selected the tacho works... Lucky that nobody suggested this as the solution



and the changing of the signal had no effect on the Innovate or VBOX RPM signal....



Now time to do some reading and learn how to identify a negative pulse trigger.

[sailaholic]

Wow such a simple solution, seems like something that should've been in the FAQ.

At least it's working like it should now.


Sent from my iPhone using Tapatalk

[Magpie]

Wow such a simple solution, seems like something that should've been in the FAQ.

At least it's working like it should now.

You have no idea how silly I felt when I did the first post then less than an hour later it was solved. Anyway I will still use the shift lights and I love the sound of this engine at 8,000.

[plohl]

Haha. Awesome! I love those kind of solutions haha

Sent from my SM-N9005 using Tapatalk