the lambda sensor is removed with the PCIII and PC5. It is replaced by another lambda if you install the auto tune unit.
Just note that the PC5 will allow you to make what the guys here call a basic or advance map. Basic map works like a PCIII map. It applies to all gears and one map is used for everything.
An advance map is made per gear, meaning each gear uses it�s own fuel map. You can even expand this and make a map for each gear, per each piston.
Since the XT only has 1 piston, no point in going further than one map per gear.
The problem is that if you pick advanced maps the dyno tuners have to build 5 different maps instead of one, so this might be why the price is higher.
For example, on some bikes they use different ignition maps for each gear and it is therefore important to build a fuel map to match the ignition timing. On the XT I don�t believe they use different ignition timing per gear, so an advance map might be a waste of time on the XT.
If you go for the auto tune, might as well go for the advance map.
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