To cold start or not to cold start, that is the question

brad65ford · 04-12-2023, 07:41 PM

LOL, but seriously how many of your are running 93 or ethanol and not running the cold start process (high rpm idle) which can be removed with BM3? I am but wondering if it effects anything. Believe its for warming up cats in cold weather, personally down south it doesn't get that cold to warrant it imho, but i could be fucking up cats or who really knows.

RM73 · 04-13-2023, 03:31 AM

What degrades cats is temperature, not lack of it. They however only do their jobs when hot, so there's that.

The cold start procedure is only there to shorten the time the cats take until they're in there effective range, to meet emissions targets.

I've got no more cats in my setup, so I'd love to get rid of the cold start procedure, it's quite obnoxious specially when truly cold, ie stopped for 2+ hours.

04-12-2023, 07:41 PM	#1
brad65ford Captain 256 Rep 764 Posts Drives: 2022 M3 Join Date: Oct 2015 Location: fl iTrader: (0)	To cold start or not to cold start, that is the question LOL, but seriously how many of your are running 93 or ethanol and not running the cold start process (high rpm idle) which can be removed with BM3? I am but wondering if it effects anything. Believe its for warming up cats in cold weather, personally down south it doesn't get that cold to warrant it imho, but i could be fucking up cats or who really knows.
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04-13-2023, 03:31 AM	#2
RM73 How Low Can You Go 344 Rep 126 Posts Drives: G82 M4CX, M1000RR Join Date: Oct 2022 Location: Lisbon iTrader: (0)	What degrades cats is temperature, not lack of it. They however only do their jobs when hot, so there's that. The cold start procedure is only there to shorten the time the cats take until they're in there effective range, to meet emissions targets. I've got no more cats in my setup, so I'd love to get rid of the cold start procedure, it's quite obnoxious specially when truly cold, ie stopped for 2+ hours.
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