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again, as before, the 280 is aimed at an 850 t5 that is a little 'worn' or 'tired', the 280 full bhp depends on the condition of the engine & other related parts. an 850 with 225k miles should have a...

A= air
F= fuel
R= ratio

I needed to make sure the car was not running lean, it is not.
There has been a lot written about VTs mapping. This map seems fine.