[19bonestock88]

So I had a thought... our cars run like crap when it’s super hot out partly due to less dense airmass, but also partly due to the PCM pulling timing back...

Who has tried to trick the PCM into thinking the air charge is cooler than it actually is? My thought is that since the car in closed loop is always adjusting AFR to right at 1 Lambda(14.7AFR), what IAT value it sees during closed loop doesn’t matter much, except for controlling timing advance, right?

I’m guessing that most IAT sensors lave less resistance when hot and more when cold, so skewing the IAT value *should* be as easy as adding a measured amount of resistance to the circuit... I would think that you wouldn’t want to move the value too much, lest you bottom out the IAT table in winter time, but I imagine a nice round 20*F correction should add some timing advance while not setting a fault code...

Now, this would alter the AFR at full throttle (when engine is running in open loop and ignoring oxygen sensors) but I imagine that could be tuned out with a piggyback fuel controller (such as a SAFC)...

Add in an EFIE in the oxygen sensors to lean the mixture in closed loop, and an engine could become much more efficient...

Any thoughts?