AIT Resistor Mod.(EBAY)

[jjj]

I know everyone realises that those EBAY resistor mods are complete rubbish. ($20 for an envelope and a 20c 1 watt resistor.lol..)

But I would like to clear something up.....

I did a search on a few ford forums and 99% of people think they trick the ECU in seeing a colder constant air temp, thus running rich. So it doesn't do anything to the already overfueled e-series engines.

But it is a 3.3Kohm resistor which equates to about 85 degrees air intake temperature. So the ECU thinks the air temp is quite high, thus running lean for about 1 week until the ECU works out from the o2 sensor and makes adjustments.

So yeah they don't over fuel, they lean out AFR.

Cheers.....................

[private9]

Ummm, ok.

i had the exact theory jjj glad someone else picked that too i worked it out to be about 85.8 degrees and by the voltage of the o2 sensor it was sitting on .02V so yes its very lean

[jjj]

The theory behind this 20cent resistor mod:

Fuel mix is determined by a very large number of factors and is directly controlled by the length of time the fuel injectors stay open. Each factor is supplied to the ECU through all the engine's sensors. The ECU then takes each value to a lookup table which will return a constant multiplier for a given input. For example, if a lean condition is detected from the oxygen sensor, the multiplier will be greater than 1, resulting in a richer mix next cycle.

The same thing goes for the intake air temperature. If the sensor is reading a hot temperature (hotter than normal) then the lookup table for the IAT sensor will report a multiplier less than 1. By tricking the ECU into thinking it's always reading a very hot temperature from the intake, the ECU can be forced to reduce the length of the pulse controlling the fuel injector by manipulating one of the many factors controlling fuel mix.

Cheers................

[[Tonko]]

Is someone bored tonight?

[3.9from hell]

Originally Posted by jjj

I know everyone realises that those EBAY resistor mods are complete rubbish. ($20 for an envelope and a 20c 1 watt resistor.lol..)

But I would like to clear something up.....

I did a search on a few ford forums and 99% of people think they trick the ECU in seeing a colder constant air temp, thus running rich. So it doesn't do anything to the already overfueled e-series engines.

But it is a 3.3Kohm resistor which equates to about 85 degrees air intake temperature. So the ECU thinks the air temp is quite high, thus running lean for about 1 week until the ECU works out from the o2 sensor and makes adjustments.

So yeah they don't over fuel, they lean out AFR.

Cheers.....................

yeah good call, how any idiot can think that ford or any manufacturer would not hav made their ecu run so much "more eficiently and produce more power, up to 20hp!!!!" if its as simple as a F@#&!%G ressistor is beyond me. also a point many ppl seem to have missed is that the ecu only corrects fuel mixture and timing values based on sensor inputs at lower throttle percentages. so at WOT nothing that alters the reading from the sensors, apart from the knock sensor mabey will hav any effect on the way the motor runs whatsoever