The ECT mod

[bluesilvermalibu]

I recently discovered a mod that they claim has been around for about ten years.It envolves using A 500ohm "pot" (potentiometer, variable resistor) in series with the ECT sensor (Engine Coolant Temperature). This Grand Am GT has been using this and only this to kick some serious ass. I have seen this little device on his car but has not wanted to tell me how to do this to my own car. The link to this mod is at http://www.midiwall.com/4Runner/ect.html

[bszopi]

The potentiometer is a better way to trick the computer than the standard computer cause you can more accuratly dial in the temp you want the ECM to see, but it is still BS. The ECM will eventually even itself out and the pot won't really have any effect on it.

[Homer]

Putting a pot for either your ect or iat sensors will incrase your h/p in theory; BUT wether this gain in horsepower is enough to even be measured by a machine is to be determined. So I would keep the stock setup. To wire it up all you do is cut the 2 wires and hook it upto the pot. I have also heard of people just taking a regular resistor and plugging it into the connector for those sensors so the computer would think it is always -40F outside. I dont remember how many ohms the resistor is though.

[Homer]

Now after i read that website, that guy just hooked the pot in series with his ect. He claims your ecm will make it run richer and advance the timming. But if your ecm thinks the enigne is extemely cold its going to stay in "open loop". Also just becasue you add more fuel doesnt mean you will always gain horsepower, it just means you will be running rich and wasting fuel.

[XLR8ING]

That mod is also documented in the "Chevrolet Fuel Injection" book I have. I don't have it handy, but it lists the resistor size to plug in instead of the ECT

[geoffinbc]

The O2 sensor and MAP sensor will cancel that mod out. It wont work.