Rev hang is mainly caused by the throttle not closing very quickly when the throttle pedal is released to shift gears.
Here is an example.
Here is an example with rev hang disabled.
(apologies that the datalog shows a shift rather than just letting off the throttle, but you can see the throttle plate drop to 0% much more rapidly)
To reduce rev hang download FlashProManager 188.8.131.52 or later, open your calibration (or a starting calibration), click on 'Mods' then click on 'Disable rev hang'. Upload. Done.
FK2 Civic Type R 2015-2017 and FK8 Civic Type R 2017-2018
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