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· In Æternum
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23,700 Posts
Were any of the modifications added AFTER the vehicle was tuned?
 

· In Æternum
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23,700 Posts
I think it's important that you discuss this with the tuner. IMO they are obligated to support their ECU calibration. In this case, you haven't changed anything and yet you are seeing issues.

Was the calibration done on a dyno or on the road? If the latter, was it remote?

Weather in the USA is getting hotter and more humid -- the tuner will need to tweak compensations throughout the first year. You will see some similar behavior in the fall and winter most likely.
 

· In Æternum
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23,700 Posts
Gotcha. I got it up to .950 last night but I noticed I’d only get that -7 FNL at 22-24% throttle if that would mean anything. Anything higher or lower and it’s a solid 0
So this is an important point.

Sometimes Calibrators only run the car through the maximum throttle and calibrate the the high load cells. This is done to save time OR if they only have an inertial dynomometer.

A good calibrator will spend time on all loads including the partial throttle loads (if they have a load dyno), but importantly the best calibrators take the car out on the street after the dyno to make sure everything looks good in the lower and partial throttle load cells.

It was mustang dyno tuned in colder weather. Right now it’s around 85-90 rather than the 45-55 when it was tuned.
This is pretty normal. It's impossible for a Calibrator to completely calibrate the compensations for different ambient conditions. It's common to see cars requiring tweaks to timing and boost control compensations throughout the year. Any calibrator worth their salt will support you with map updates. Have this conversation with the shop that tuned your car.
 
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