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Whit my ST I purchased the mountune 275 upgrade kit.
The car runs fine. But now am seeing more black carbon build on exhust tips.
should I get the car dynode tune ???
I do not keep the programmer connected to the car.
 

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2017 Ford Fusion Sport
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Whit my ST I purchased the mountune 275 upgrade kit.
The car runs fine. But now am seeing more black carbon build on exhust tips.
should I get the car dynode tune ???
I do not keep the programmer connected to the car.
Hook up the programmer and monitor the gauge "AFR Actual" to make sure you are not running rich (or lean...which is more dangerous).

Our cars make a LOT of carbon back there. Mine needs clay barred so bad right now because my bumper is more black than it is blue. So, it might be normal. Better safe than sorry though so I would monitor it.

When lightly cruising or idling it should be at 14.70 on AFR. When coasting (moving) with foot on gas it'll spike to like 40-44 because the fuel injectors turn off to save fuel. When you are "getting on it" and you have the pedal to the floor it should be somewhere around 10.5-12 (10.5 being a little on the richer side of things and any higher than 12 being too lean WHICH IS BAD)
 
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