Altering Resistance of Air Intake Thermistor

[Utencil]

I have seen an advert for something which is called a "performance mod chip", however this is infact just a resistor, which I believe is supposed to fool the ECU into thinking that the incoming air is colder, and thus advance the timing. Would this actually make any positive difference to the performance?

Yes I know it probably sounds stupid, but he who does not ask does not know!

Cheers,

Mike.

[Q45tech]

The intake air temp is used as a Double Check on the MAF and to reduce reliance on the coolant temp sensor to avoid the less than precise method used in the early/mid 90's to retard the base timing when the coolant exceeds 194.999F. [1 degree is lost per 5F increase in coolant temp reading till 220F where is has dropped upto 6 degrees on many software programs].

To help reduce the chance of knock before the knock sensor pulls out excessive timing.

Detailed analysis is required to determine IF the fooling of the intake sensor does GOOD OR BAD based on various ambient temperatures and fuels and fuel temperature.

Might make things worse on individual engines you never know.

The base ideal air temperatures are 60-70F so each 11F is a 1% reduction in density...............Generally the air temp is measured to avoid [warn in] excessive situations where in bumper to bumper traffic the air could be 130-140F.

The MAF doesn't care it just reports the density which could be lower because you drove up a 5,000 ft mountain [-3% x 5k=-15%] whereas 140F air would only drop things by [-8%].....either way the injector duration would decrease to maintain the correct AF ratio.

What most don't understand is WOT is always excessively rich to protect the engine, if anything more power will be gained by leaning the mixture out till the pistons/valves/rings/heads melt.

Almost always less fuel is needed.