Originally Posted by Walter

Originally Posted by hard2obtain

I found this articles, what do you think about. I can tune it with this?

Heres the first one
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One of the unused wires is blue, and the idea here, is to hook it up to the 02 Sensor. If you do that, and you go to the etc. menu and select the Sensor Check option, under #2 you will see your 02 Sensor voltage.

Basically, the voltage read from the Stock 02 sensor can be translated into three categories: Lean (too little fuel), Correct (Just Nice), and Rich (excess fuel). Unfortunately, the differences between the three categories are sometimes slightly blurred and it is hard to tell. For that reason you should always tune a little on the rich side.

For reading the 02 Sensor voltage (remember all readings are taken at Full Throttle). From OV - 0.88V (lean), 0.92V (just nice on pump gas) and 0.96V - Up (rich). Note: When you are at partial throttle (or when the car is idling), the 02 sensor voltages will cycle from and display anything from 0.2V and 1.0V. So don’t panic, it’s normal!
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Heres the second
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hook up the blue wire to the o2 sensor signal wire. you can do it anywhere on the line itself or at the ecu (pin C15 or 16 i believe). its a signle white wire at the o2 side and the ecu side. you can find it easily (ecu side) buy cutting back part of the harness loom. look for a really thick brown insulator. in that insulator is the white wire to and from the o2 sensor. *be sure to use a larger guage (thinner) wire when hooking it up* (super low amounts of current pass thur this wire, too thick of a wire the ecu ***** up and throws codes for the o2 sensor) once the blue wire to the afc is hooked up start the car. goto the main menu, arrow down to "etc". once in the "etc" menu goto sensor check. voltage off the o2 sensor will be listed under "input 2" or "in 2". it mesaures up to one thousanth of a volt. when you first start the car you will only get a reading in the hundreths of a volt. this is because the o2 sensor is only usefull once heated.

how to tune.
o2 voltages rage from 0 to 1. 0 being lean as hell and 1 being rich as hell
.500 - .600 volts corresponds to a stoichiometric (14.7:1) air fuel ratio. this is a dead nutz air fuel ratio. not rich not lean. anything higher than that correcponds to a more rich mixture. anything less than .500 volts translates to a lean mixture. anything over .600 trans lates to a more rich mixture. optimum performance during WOT is a slightly rich mixture.
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Originally Posted by reactone

I don't think you could put much stock in the o2 sensor voltages if they're not wideband (0-5v)

Originally Posted by hard2obtain

Im start to thing about FMU and Walbro