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-   -   High RPM (http://www.bimmerfest.com/forums/showthread.php?t=670307)

colink 01-15-2013 04:35 PM

High RPM
 
6th gear. 2850 RPM. 75 MPH

Manual gearbox, 2004 645Ci convertible.

Does this seem like high RPM to other owners of manual cars?

Or has a previous owner fitted a modified differential?

Patton63 01-16-2013 07:37 AM

That is similar to mine (650i). I find that mine runs at higher RPMs than I would have expected at cruising speeds, which I simply assumed was normal for this car.

645/333 01-17-2013 12:56 AM

others can speak for the manual, but on the auto it is much lower close to >2k give or take

Patton63 01-17-2013 12:15 PM

I've been struck by how high the RPMs are with the manual at a given speed. Not sure what it would be different than the automatic, but it clearly seems to be.

John Davis 06-27-2017 08:14 AM

This is the only thread I've found on this topic, so I'll resurrect it.

I have a 650i automatic and I was enjoying it in steptronic the other night, cruising in 5 in the low 3000s. If I accelerated, it would jump up a few hundred rpm.

Is there any problem (aside from fuel usage) in cruising above 3000? How about above 4000? Not that I would do that very often, but I wonder what these engines can tolerate. My E46 is a high revving engine by design, but I notice that my 650i routinely runs at lower rpm than the E46.

HerbP 06-27-2017 02:36 PM

The power band in our cars is usually above 3k RPM's. The higher the RPM's, the stronger it pulls. If you are going to drive at this RPM, make sure you keep fresh oil in the engine.

Drive it like you stole it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

John Davis 06-27-2017 09:01 PM

Quote:

Originally Posted by HerbP (Post 10277058)
The power band in our cars is usually above 3k RPM's. The higher the RPM's, the stronger it pulls. If you are going to drive at this RPM, make sure you keep fresh oil in the engine.

Drive it like you stole it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Okay, I will! And that makes sense; cars are engineered to operate in their power band, and I've now googled graphs of the 650i torque curve to see it.


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