O2 Sensor Delete

[Catbox_95]

I found a schematic to build an after-cat O2 Sensor delete where it tricks the car into thinking the second O2 sensor is working just fine. The schematic says to use at least a 12 Watt resistor connecting the 2 black wires, but all I could find was a 10 Watt and a 50 Watt. I bought the 10 Watt and it gets so hot it starts to smoke after about 2 minutes of the engine running. Since it says to use "at least" a 12 Watt, I was thinking that maybe I should go with the 50 Watt. Anyone have any experience with this???

 

[Slipstream]

I don't have experience with this specific application. However I do know electronics and the 50W should be more than ample if a 12watt is what was suggested. So long as the resistence value of the resistor is the same, the wattage rating just allows it to handle more juice. Usually the 3 most common reasons higher wattage resistors aren't used are that they are overkill/price, larger (space considerations), and some people (don't ask) like to use the resistor as the weak point in the electrical system so that if it gets overloaded the cheap resistor fries before the rest of the circuit (cheap fail safe for when fuses fail (or would that be don't fail?)). Like I said, the 50W should be more than enough to handle it, so long as the resistance values are the same.

 

[Tallen]

50watt will work wonderfully.

 

[Catbox_95]

Thanks guys. I forgot to mention though that it also requires 12 OHMS resistance and all I could find is 10 OHMS. Since it requires 12 OHMS and 12 WATTS, could I use 10 OHMS and 50 WATTS? That is the closest thing Radio Shack seems to have.

If I MUST have 12 OHMS, then possibly could I wire a 10 OHM and 2 OHM in a series to achieve 12 OHMS?

Thanks again...

 

[Slipstream]

Yes resistors can be wired in series so a 10ohm and a 2 ohm would be 12 ohms. Make sure that both can handle the 12watts or greater. I wouldn't suggest creating the circuit out of spec, so I'd say you need the 12ohms not 10 ohms.

 

[Omega]

Depending on which resister that is, a 10 ohm will be fine. One of the resisters is the one that creates the sensor feeback (what the ECU wants to know about) The huge 50 Watt resistor is just there to "soak" up the power to heat the element.