RPMs bogging down during hard acceleration, Help Plz!!

[telijah]

Would gears being hard to engage while sitting still be a sign of a faulty throw out bearing, CDV or even pressure plate?

It could be, but you would likely have other symptoms too if it were the clutch. Synchros could be going...

[AzkotikBMW]

A lot of sniping in this thread. Unnecessary. Let's be better than that.

Question: Kyle, when are you taking this to the shop?

Sorry Boss, didn't know it would be such a controversial question =\

I am hoping to get it into the shop next Friday.

And I haven't driven it like this since I took that video, for fear of doing more damage to the car.

[Marcus-SanDiego]

Kyle, no worries. We're all passionate about our cars. We're also passionate about having answers.

Good luck getting to the bottom of things.

[AzkotikBMW]

Have my appointment set for next Friday with Seth @ JB Eurotech. They do great work and Seth is a really good guy!

[Marcus-SanDiego]

Good. I'm sure you'll follow up with us.


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[Oli77]

The more I look at the video, the more I am thinking there is not much wrong.
You hit 80 mph in ~14 sec and 95 mph in ~18 sec, is that bad?

Also, it is normal for RPM to dip when you switch to a higher gear, that's the whole idea (and the reason you have 6 gears).

Nevertheless, I find this thread interesting and a good learning experience.

I am also curious if the dual mass flywheel might not be involved: See symptoms here

Not sure I understand this video.

[VA//M3]

Have my appointment set for next Friday with Seth @ JB Eurotech. They do great work and Seth is a really good guy!

He should get you sorted out, no prob!

I've had my battles with Seth but he does know what he is talking about and is an all law abiding and environmentally conscious service tech. So he will make sure your car is running in tip top shape as to reduce emissions!

[VA//M3]

The more I look at the video, the more I am thinking there is not much wrong.
You hit 80 mph in ~14 sec and 95 mph in ~18 sec, is that bad?

Also, it is normal for RPM to dip when you switch to a higher gear, that's the whole idea (and the reason you have 6 gears).

Nevertheless, I find this thread interesting and a good learning experience.

I am also curious if the dual mass flywheel might not be involved: See symptoms here

Not sure I understand this video.

Our flywheels are designed this way



The spring movement is exaggerated on that video. Even if the springs collapsed inside the blocks (mechanical stops) would keep the flywheel from free spinning and would instantly meet themselves and try to break the tires loose as a result instead of just slipping and then grabbing.

The springs collapse anyway when you dump the clutch and or shifting properly--That is by design.

[Oli77]

Thanks for the info VA. So not likely that the flywheel is involved in OP's problem (if he does have a problem).

[Oli77]

Inquisitive minds want to know!