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Old 01-20-2021, 08:02 PM   #3 (permalink)
Tractionless
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Join Date: Jan 2016
Location: Atlantic SE
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Drives: '10 K23 ST 7AT
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Quote:
Originally Posted by Eris View Post
Hello, people. Good day.

When up shifting from 3rd to 4th in manual mode, shifts are too severe and fast... seems like it were a double clutch transmission with how fast it changes, yet everywhere else is shifts at normal speeds. It also sometiems makes a tiny clicking noise. And ocassionally will 'slip' when changing... or what I think others call "flare"... it will jump around 300 revs up before going down and setting on 4th (again... also bullet fast).

This also occurs only when the accelerator is at load... and knly at around 3-4k revs... If I drive barely touching the pedal or if I up shift higher than 4500, it shifts normally.

The car was also scanned just 3 months ago for an unrelated issue; nothing came up.

Weird part is that... it only has 30k miles.

So if that gear is starting to slip... at 30k? And if it needs transmission fluid change or... umm... flush... at 30k ?

Those abrupt shifts dont really clunk... sometimes in general... and on other gears... but I think that happens nornally at times given these transmissions can a few times be a bit dim-witted... its just a tiny click.

There are also sometimes HUGE delays in manual mode when downshifting going really slow... from 2nd to 1st...
But thats always happened... mentioning it just in case.

Other than that... it's always up and down shifted normally and without issues... responsive...normal quick...no noises... and it still does... save for 3-4


Thoughts?

Thanks for reading.

Forgot to mention... the car has this common issue where when at normal operating temperature (oil at 200-220), it loses noticeable power... perhaps around 10-15%. Mentioning also in case it points to something.

Sent from my SM-G985F using Tapatalk
3-4 shift is known to have a harsh double feel. My '10 does the same even after a fresh change and with a trans cooler. There is an update to the TSM which helps, see if you have it. Tunes which manipulate the torque demand will also help, did with mine which has 93k on the clock. I also note similar behavior jumping rpm between shifts mostly when cold as torque converter lock up only begins at 2475-2775 RPM and only between fluid temps of 122*-176*.

REALLY wish ECutek would get off their butts and install the OE available trans fluid temp PID into their friggin' app and desktop program already for reference while driving.
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