$lacker

iTrader: (9)

Is it possible to get speed and RPM signals to the PNP modular ECU without the stock cluster installed? I'm under the impression that one (or both) of those signals travels through the cluster before going to the ECU, but I could be wrong.
My stock cluster has a dead odometer and the tach/speedo jump around sometimes. I would rather upgrade from a PowerFC to an Adaptronic ECU and buy a digital dash (likely the AIM MXS Strada) rather than buying another stock cluster
Thanks

silentblu

iTrader: (1)

Your ECU is what is controlling the RPMs so no matter what ECU you use (PFC or Adaptronic) both will have an RPM reading.

For Speed, there are 4 sensors on your transmission, one is the speed sensor. Ages ago I had to separate those wires in order to get speed to work. It is C1-08 connector on page Z-42/Z-43 of the wiring diagram.
It snakes from the driver side of the transmission, to the passenger side firewall/ECU grommet and connects to one of the body harnesses.

On almost all wire-in ECU's this harness is independent of the engine ECU harness. Same goes for Rywire Harnesses as well.

$lacker

iTrader: (9)

Thanks, that makes sense
What issues were you having that necessitated separating the wires to get the speed to work?
Are you saying that worst-case scenario, I could run a separate lead from this harness directly to the ECU?


Looking at the ECU info online, specifically the "vehicle speed" section, what is a "Selectable 2k2 pullup"?

silentblu

iTrader: (1)

I was trying to remember last night and was not sure which harness I had to separate it from. The 4 transmission wires are a part of the OEM engine harness. My microtech from ages ago had its own engine harness loom and I separated the transmission plugs from the OEM engine harness to get my speedo to work.

The OEM harness and rywire harness WILL have the transmission plugs you need. So PNP units will have speed and RPM at the ECU.
Mil-spec Tucked 13B Harness (FD3S/Rx7)
Transmission plugs stated on the Rywire site, and the 4 plugs (grey, black, grey black) on the top center.

Specifically for the wire-in adaptronics this is what I have found, and have no first hand information on what needs to be done. From other ECU/motor conversions I have not seen this being needed, simply tapping a different portion of the harness after the signal has been conditioned/interpreted.

This article seems to tap it at the source of the speed sensor.
S6 RX7 vehicle speed sensor

I have not see anything about a 2k2 pullup for speedo, but it should mean a 2k ohm 12V pull-up resistor. One of the criticism is that you need resistors here and there to interpret/output proper signals.
i.e. resistor for tach output to stock dash. You can search here in the adaptronic forum specifically for this.

$lacker

iTrader: (9)

That's a great help, thanks!

$lacker

iTrader: (9)

I've been doing some reading - is there an alternative way of getting speed to the ECU? Like using a front ABS sensor to register speed instead?

Would one way or the other be better?

Monkman33

iTrader: (28)

You could install a GPS speedo that has a vehicle speed output.

But any sensor signal that is road speed dependent could be made to work. However, abs sensors apparently do not like to be shared if you still have the factory abs computer and an operational abs.

$lacker

iTrader: (9)

Apparently you need a GPS source that updates at at least 20Hz, which is asking a lot

silentblu

iTrader: (1)

I imagine the link I posted regarding speed sensor would be better then messing with the ABS. Is there any reasons for not wanting to use the diagram that I linked from Adaptronic website?

I have read, but do not recall the mechanics/details, but people with engine/transmission swaps use a device to get the speed, I want to say its Dakota digital something something. You are going to have to search for this, perhaps in the other engine swaps, or on norotors.

If you track the car, Harry's lap timer also requires a pretty high refresh rate to get accurate laptiming. They have recommended GPS/Accessories which don't seem that bad in cost (relative) to a digital dash. I think they have links for 10hz refresh rate.

I've looked into seeing how the adaptronic would output in order to get the video recording/engine data on to video, but never got around to it. Last hint was about the ELM protocol output.