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Originally Posted by HaroldC
The revs still drop, but it might be because the transmission is shifting to a higher gear. Huh. I'd like to get the definitive answer to this, so I'll just ask my friend that works at NA.
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Depends on engine and vehicle speeds. Easy way to check is to look at the fuel consumption, because the OBC records instant fuel consumption as 0 when the converter is locked, while there's minimal (like 4 l/100km) when it's not.
Usually if the revs are below 2500rpm, it won't upshift to the next highest gear. I get this a lot in my parents' 325i. When cruising at around 60km/h, the car does 5th gear at 2100rpm. If I get off the throttle, the rev stays and it does not upshift. Do it at 80 km/h though, and it will upshift quietly to 6th @ 1600rpm.