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I want to start tuning my car so i am looking for a wideband. i am confused at this part . i went to all the good websites. I see that all tuning websites sale widebands with controller or without (WB 02 only). i want to know if i can buy only the wideband and use Freelog to read the wideband 02. If so how do i wire it up to my obd1 honda ecu. If i have to buy a controller also how do i wire it up so the freelog reads it.

for instance...if you buy an lc-1 from innovate. you get, as a package, the wideband sensor and the wideband controller. the controller interperets voltage from the sensor and sends a configurable voltage out throught the analog outputs.

you would disconnect your stock o2 sensor and connect the analog output to that wire of the ecu. freelog will read the voltage seen at the ecu and, if you set freelog the same as your configured voltage slope, freelog will calculate your AFR from the voltage seen on the stock o2 sensor circuit.

easy...

You must have a controller with the sensor to use it. There's no way to hook the wbo2 sensor up to your ECU or laptop by itself to log AFRs. The controller manipulates the heater and other sensor elements so the sensor works and doesn't die in your exhaust stream. It will die if not properly heated in exhaust. The controller also reads the sensor output and converts it into something you can use in your ECU or computer.

"widebands" consist of 2 parts: the sensor and the controller. they call it a controller because it needs to precisely regulate the heater and temperature on the sensor to maintain an accurate reading.

There are different options for logging it: the most common is rescale the vout to be 0-3V if your going to plug it directly into the ECU's o2 port. If you do the 0-5V mod, you do not need to rescale the output. once the signal is going to the ecu, th elogger application only needs to read that sensor or memory address to log the reading, just as any other sensor.

Once everything is hooked up you need to set your o2 offset to match what your wideband is putting out; if you have a known good (digital) external display, you can sync your PC's datalogged reading to what you are seeing on the display. Sometimes you have to use the Innovate logging program while hooked to the wideband's serial port to view the AFR and calibrate the readout in your logger to be the same as what the unit is reading. Reason: The voltage being put out, and what the ECU sees aren't always 100% the same, so there is an offset in volta or AFR to correct for this.

The most cost-effective and widely used WBo2's are the innovate Lc-1, small compact and cheap.
http://www.moates.net