Originally Posted by downwardspiral
I would have just said it doesn't work.. lol. I wouldn't trust anything that tricks sensors into reading different values.
You are not tricking anything, you are taking the air tmeperture out of the equation and forcing the ECM to control timing via the knock sensor.
GM in the early days had no IAT sensor only a knock sensor. Worked great on throttle body but port injection likes air density in the calculation however not totally necessary if you know the trade offs. For the most part, the IAT sensor is fine trim of the fuel map.
An engine is 1800's tech, there is no mistery in pressure in a closed top hole.
Hope this is of use to you.