A resistor on the IAT sensor?

[gmcuajo]

What do you think about installing a resistor on the IAT (intake air temperature) sensor?

I heard that from a guy that bought a resistor of 3kΩ or 3Ω (kilo-ohm) on eBay to put on the IAT sensor. They sell on eBay as a "chip". (Remove the IAT sensor socket and then put the two terminals on the sensor socket, one on each end).

On eBay says that resistor will tricks the ECU thinking the intake air much more cooler, then the ECU will send more gasoline for a richer mix.

Do you really think this work as expected? What do you about a 3kΩ on a tropical weather (PR) where the outside temperature on a common day is about 85 degrees.

[gmcuajo]

What's up???

Nobody know what is the IAT sensor, the "plastic" shit on the intake, with a wire...

[gmcuajo]

What's up?

Nobody know what is the IAT sensor?

The IAT sensor (intake air temperature) just "read" the temperature of the itake air to allow the ECU to adjust the fuel curve (and other parameters) due to the changes of temperature, etc.

This sensor send to the ECU a signal in form of voltage. The theory is that installing a resistor instead the sensor the ECU will "think" that the temperature is constant, and colder, and it will inject more gasoline to compasate the colder (and higher density) charge of air...

[i_a_n112784]

I doubt dumping more fuel in will make much of a difference unless you can get more air in there for it to combust with. You might get a bit more power, but I'm sure you'd be burning too much gas to make it worth while.

[Kven]

technically, it can work, but Honda ECUs are already tuned pretty good to work with the stock components. also, you might run into conditions where youll run too rich.

[superbluecivicsi]

http://www.automotiveforums.com/vbul...&highlight=iat

[Smoghog]

Originally Posted by gmcuajo

What's up?

Nobody know what is the IAT sensor?

The IAT sensor (intake air temperature) just "read" the temperature of the itake air to allow the ECU to adjust the fuel curve (and other parameters) due to the changes of temperature, etc.

This sensor send to the ECU a signal in form of voltage. The theory is that installing a resistor instead the sensor the ECU will "think" that the temperature is constant, and colder, and it will inject more gasoline to compasate the colder (and higher density) charge of air...

Unfortunately you have a thing called a O2 sensor which will tell the computer to lean it out even if the air temp is cold/rich.

Good Luck

SH

[tech.]

those little resistors are like what 20 bucks? well it may help a little but you get what you pay for if your just playing the go ahead but if your serious the dont waste the money

[Kven]

Originally Posted by Smoghog

Unfortunately you have a thing called a O2 sensor which will tell the computer to lean it out even if the air temp is cold/rich.

Good Luck

SH

Those are narrow-band sensors; they will only tell if its too rich or lean(it tells the ECU whether the the A/F is 14.7 or not, and usually in the high rpms the ECU runs in closed loop so the A/F readings wont effect the fuel maps). The air-temp sensor modifies the fuel maps via a multiplier(i believe Crome has an option to modifiy this also).

[AudioGuy93DelSol]

Alright, so I have tried this for the sake of arguement. I rigged it up so it was swichable from stock to "resisted." My 0 - 60 times deccreased and my car ran like crap when it was engaged. Bottom line, it's junk and it's a waste of money.

[Smoghog]

Originally Posted by Kven

Those are narrow-band sensors; they will only tell if its too rich or lean(it tells the ECU whether the the A/F is 14.7 or not, and usually in the high rpms the ECU runs in closed loop so the A/F readings wont effect the fuel maps). The air-temp sensor modifies the fuel maps via a multiplier(i believe Crome has an option to modifiy this also).

Well the O2 does tell the ecu it is lean or rich by a voltage. What I was going for was the ECU would figure in the cooler air temps and remap the fuel back to 14.7 or should I say either side of 14.7 to 1.

However what you can do is relocate the IAT to the intake tube in front of the TB. This will fool the ecu into thinking the air is cooler than it was from the bottom of the intake manifold.

This should almost do what you are looking for. It might get you a hp or two and it might not.

SH

[Kven]

Originally Posted by Smoghog

Well the O2 does tell the ecu it is lean or rich by a voltage. What I was going for was the ECU would figure in the cooler air temps and remap the fuel back to 14.7 or should I say either side of 14.7 to 1.

Its actually the other way around, which was what I was trying to say. Thats why youll notice rich conditions during startup, cold weather, etc. Its usually correction via 02 feedback, then correction via multipliers.

Then when you go into the higher rpms, the ECU doesnt even take info from the 02, instead it just delivers whatever the fuel maps say and its modifiy by whatever multipliers(air temp is one).

I say if you really want to experiment with a modded IAT; do what Smoghog said and try relocating it, and also instead of a fixed resister try using a linear-rate potentiometer. Sort of "adjustable" hacking/tricking I guess.

[gmcuajo]

Originally Posted by tech.

those little resistors are like what 20 bucks? well it may help a little but you get what you pay for if your just playing the go ahead but if your serious the dont waste the money

Not $20. Just $2-3 at Radio Shack.