Quote Originally Posted by Beran View Post
Although no one has really tried to use a custom map system yet with the 16v - maybe this might give it more of an edge. Any thoughts?
I've been considering this from an academic perspective for a while and cannot figure out how this can be done with off the shelf ECU hardware. The PL engine with CIS-E does not have a toothed crank wheel, only a hall effect cam sensor. So I don't know how one could install an aftermarket ECU to run fuel and spark, as allowed by the new IT rules. (Well, it was allowed before, just had to be within the stock box.)

If you can write the software I have thought of one way to do it easily. And that is to have an ECU read in a wideband O2 sensor and then based on a map of say engine load and rpm, output a simulated switching O2 sensor to bias the DPR as desired. Essentially intercepting and fooling the stock O2 sensor input. But this would only work for closed loop operation, not open loop.

There is one other way, and that is to remove the CIS-E unit and run the DPR control out of a programmable ECU. But again, that only affects closed loop operation and not open loop.

So the new ECU rule is useless to those of us with mechanical fuel injection and no stock toothed crank wheel. Since the new open ECU rule doesn't benefit everyone, I wonder if the SCCA would consider a clause to allow sensor/actuator parity to go along with the open ECU rule? Probably not.....