Im just wondering what the wideband does and why i need to have one with the rtek2.1

 

I don't see why you absolutely NEED to have one although you won't be able to tune air fuel ratio without it. Typical narrow band O2 sensors are really only designed to be read by an ecu so it can hold readings around stoich when cruising. A narrow band sensor is really closer to an on off switch when it comes to readings at the voltage isn't linear outside of stoich. This means that all those guys running around with air fuel ratio gauges who just hooked them up to the stock O2 sensor are just fooling themselves.

A wideband is a fairly linear device. It gives differing voltages for different a/f ratios. since it's fairly linear, it is also accurate and is the only way to tune a/f ratios accurately. A narrowband can't do it.

 

A simple answer, so you don't blow your engine. If it gets too lean for very long....you're done. So yeah, you don't need one, but it's not very smart. It would be very difficult to get your fuel set correctly without it.

 

It's not the only accurate method to tune your car. You can also use an EGT(exhaust gas temperature) gauge to tune your car. I heard of several tuners that will only use EGT as apposed to wideband for tuning.

 

I would like to do both EGT and Wideband 02. I have read that the Wideband would used to tune your air fuel ratios and the EGT to turn your timming. So I am looking into getting a EGT for my setup as well.