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i AM IN THE PROCES OF BUIDLING A jAYCAR KIT, THAT USES A NEW CHIP TO (oops caps) show your AFR using a narow band sensor. works on an input voltage of 0 to 1V, which is fine. It does not show exact number say 12.4 to 1, but it simply indicates that you are a bit or a lot lean form stoick and so forth. It is not used for tuning, but more to ensure you are not lean or too ritch, a guide more or less.

If you are buying a guage, make sure it has 0-1V inputs for narow band, or get a new wideband sensor $300 and use a 1-5V output.

This is for a GTST, not sure what value the GTRs have for their nerow band sensors.

Thanks wogsrus.

Anyone else got anything to add? I am surprised that there isnt more interest in this topic as Air Fuel ratio is one of the most important factors in tuning your car right, and also keeping your car running!

you are correct, but in order to get an accurate reading you need a wideband sensor, thes are $300, and some require a controller for the signal. There is a Oz mob that doa whole package for about $400, sensor, controller, display and so forth, can plug it thourgh your laptop and so forth, but a narowband sensor will gove you a simple indication if you are lean or ritch, that's about all.

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