4k RPM Power Dip

[Sockethead]

I wish there was a definitive answer on this. I've never really noticed the 4k RPM dip, though there is definitely a substantial hesitation/stumble on mine between 2600-3000 RPM under moderate throttle. (Less noticeable during WOT but it's still there.) It's the place my car spends the majority of it's time and would actually be a very satisfying range if not for the stumble. It feels like the car has the most torque and is pulling really well between 1000-2500 RPM but then it stumbles and feels like shit unless I preempt the stumble with WOT around 2000 RPM and then back off quickly after 3k. It's F-ing annoying and I wish there was a solution because this car is otherwise an excellent DD, as well as a fun weekend corner carver.

I replaced my DISA a few months ago and it had no effect. I also did the Shark Injector shortly after I bought it so I don't know if that made it worse or better. I can't remember how it felt before the Shark tune.

There was an issue with non ZHP cars that produced the exact situation you're describing in that RPM range. The latest BMW software cured it.

Disconnecting your DISA will remove the dip, but you will have no power low end. Car will drive like crap and you will see yourself reving out each gear in reular driving. Do not recommend.

I never said I'd recommend it lol

[cornercarver]

There was an issue with non ZHP cars that produced the exact situation you're describing in that RPM range. The latest BMW software cured it.

Which means a trip to the $tealer to get the latest software installed, which means first removing the Shark tune, then re-installing it afterwards.

I guess if I want it fixed I have to just bite the bullet. Has anyone reported a loss of overall performance as a result of the new software? I’d hate to get it done only to find some other deficiency as a result.

[Newjack]

Which means a trip to the $tealer to get the latest software installed, which means first removing the Shark tune, then re-installing it afterwards.

I guess if I want it fixed I have to just bite the bullet. Has anyone reported a loss of overall performance as a result of the new software? I’d hate to get it done only to find some other deficiency as a result.

Some people still have the issue with the latest software

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[dubfreaks]

Just replaced the DISA valve... dip is gone!

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[Sockethead]

Good news!

[johnrando]

+1

Good news!

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