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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications How to turn off the catalyst heating?

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      01-05-2022, 08:54 PM   #1
Justagoodguy
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How to turn off the catalyst heating?

Hi guys! I'm the happy owner G20 M340i 21year production.
I have catted DP & it sounds perfect in the street, but not in the my underground parking garage, it feels like it's coming from hell. It's funny, but not for my neighbors
Someone knows how to remove/delete/disable catalyst heating when starting up the car ?
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      01-05-2022, 09:00 PM   #2
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Quote:
Originally Posted by Youonlyliveonce View Post
Hi guys! I'm the happy owner G20 M340i 21year production.
I have catted DP & it sounds perfect in the street, but not in the my underground parking garage, it feels like it's coming from hell. It's funny, but not for my neighbors
Someone knows how to remove/delete/disable catalyst heating when starting up the car ?
I can relate 100% love my catted DP but the cold start did wear on me after a while. Your only option as far as I know is a flash tune - which may not be an option for you with your 21' but maybe. Piggyback (JB4, RaceChip etc) I know for sure cannot help and I don't think the coding apps offer a solution

I am flashed and turned my cold start off - it's perfect (for me)
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      01-05-2022, 09:44 PM   #3
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So the loud cold start is to warm up the cats? I always wondered why it starts up so rambunctiously. I wonder if there's a sensor it's reading to determine when to wind down or if it's set timeframes.
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      01-06-2022, 09:41 AM   #4
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That comment that it “comes from hell” made me crack up. It’s so true

Enjoy it in all of its glory, man! We won’t enjoy this sound for long. Eventually we’ll all be driving EVs

Anyhow, I’m sure that a tuner can tune out the cold start. M Engineering can do it for Porsche, so…
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      01-06-2022, 09:44 AM   #5
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Quote:
Originally Posted by v_ckash623 View Post
So the loud cold start is to warm up the cats? I always wondered why it starts up so rambunctiously. I wonder if there's a sensor it's reading to determine when to wind down or if it's set timeframes.
It’s an emissions thing.

The irony being that the tree huggers created a situation where exhausts are now obnoxiously louder than they need to be, LOL
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      01-06-2022, 10:43 AM   #6
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Quote:
Originally Posted by TupperBMW View Post
It’s an emissions thing.

The irony being that the tree huggers created a situation where exhausts are now obnoxiously louder than they need to be, LOL
Exactly. They're now starting to complain about loud exhausts. At least in NY, they're trying to crack down on exhaust noise, stating that it's "dangerous" and "polluting". Whatever keeps pitchforks in the clutches of Karens across the state, I suppose.
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