My understanding is that a resistance change to the IAT sensor will modify the injector pulse width for any given set of input parameters (MAP, TPS, CT etc)

I found an ebay resistor supplier of make and model specific resistances so as to throw the PCM into a different area of the fuel map. (sorry for the awkward wording there) They claim an increase in HP. Does anyone know if the intent is to simulate a cooler denser charge to richen the mixture or a warmer flow to lean it out? I presume it's to lean it out. My suspicion is that this would be a temporary effect until the injector offsets accounted for the change in mixture detected by the O2 sensors.

Anyone out there know anything concrete here?

Here's the link.
http://cgi.ebay.ca/20HP-Performance-...item35acb082f8

At second glance, perhaps the intention is to richen the mixture. Problems with emission testing? Again - a temporary effect once it runs in closed loop a few times?

 

Doesn't work. Complete snake oil. The PCM will quickly adapt and basically start ignoring the IAT readings since they will conflict with more important sensor inputs.

 

Just what I thought - I think this might be good at the track, where you could lean it right out for a single pass and then reset the ECM, but other than that useless for a daily driver.

It does kinda make me wanna sell $0.10 resistors on ebay for $4.00 a piece though!!!! lol I wonder how much this guy rakes in on these things....