I am looking forward to do a PowerDyn setup (http://www.powerdyn.fr/English/PowerDyn.html
) on my car.
This is a low-cost dyno-like system, that gives a rough image of performance changes between different setups.
All you need is to get a tach signal and send it to your laptop's line in (or record it with a MD or MP3 recorder, then process it on your desktop computer).
A suggested setup is like this:
The signal is taken from the negative terminal on the coil, which gives an inverted signal.
I would like to grab the signal from the ECU harness.
I've had a look at the schematics there: http://miataturbo.wikidot.com/ms2-h
I also found this, which seems to be for a 94+ NA:
2I would be perfect, but on MT's NA schematics it is not connected on my 91' NA.
So far, I see:
- 1G ou 1H, it seems connected to the negative coil terminal. What do you think of it? Does it seems OK to you?
- 2E (CAS). This wire seems sensitive to perturbations. I don't feel confident in connecting there.