Tom's Fuel Map Controller + TRD Racing Spark Plug

[Bluevitz-rs]

Originally Posted by CTScott

Do a web search and read some of the reviews before you drop the money. It inserts between the MAF and the ECM and fools the ECM into thinking that more air is coming in, so that the ECM will feed more fuel. The problem with it only overriding that side (and not the feedback side via the O2 sensors), is that the ECM adjusts the trim accordingly, so the improvements will only be temporary, unless you routinely clear out the short term data by disconnecting the battery for a couple of minutes.

You're on the right track, but your messing with the wrong signal.

What other sensor is inside the MAF sensor?...... Intake air temp. What would the ECU do if it was sucking in -40° air? richen the fuel mixture up permanently until it saw warmer air being drawn in.

All the toms unit does is adjust the resistance of the intake air temp sensor so the signal going to the stock ECU thinks it's in cold weather and adjusts the fuel trim accordingly. I leaned this trick while sitting in on an advanced engine management course when I worked at Toyota Canada.