SPD signal ECU

[firehawk]

In our AE82 FX-GT race car, we also had a smallport 7-rib engine ("red top") and had removed the dashboard completely - didn't have any problems at all. We had also removed all the idle-up and cold start features so the car needed to be started with a bit of throttle applied when the engine is cold.

I think that the signal is mostly used for the 180km/h speed limiter on JDM engines - can't think of any other use for it. Using it, for example, to compensate against wind drag at speed wouldn't make sense as the effect can be seen also in the manifold vacuum as increased load.

JMR_AW11 might be the guy to ask about the internal secrets of the ECU - he's disassembled the code contained in the CPU chip and knows a lot about how it all works.