How important are the DISAS?

Nando_e90 · 05-14-2023, 01:36 PM

Last week I found that my large DISA failed, and so far I haven't replaced it yet, just removed the loose flap and pin from the manifold, but for some reason I feel the engine more responsive since then.

I'm thinking of leaving it as it is. Does it make any sense?

StradaRedlands · 05-14-2023, 03:40 PM

Interesting question... I wonder if there is a downside, either with fuel or maintenance?

jadams161 · 05-15-2023, 08:21 AM

The DISA valve is required and an integral part of the air intake system and design. If the large valve has failed chances are the small valve is bad too. Always good to replace them both if unknown age and miles on them.

05-14-2023, 01:36 PM	#1
Nando_e90 Second Lieutenant 111 Rep 245 Posts Drives: 2006 E90 330i Join Date: Dec 2018 Location: El Salvador iTrader: (0)	How important are the DISAS? Last week I found that my large DISA failed, and so far I haven't replaced it yet, just removed the loose flap and pin from the manifold, but for some reason I feel the engine more responsive since then. I'm thinking of leaving it as it is. Does it make any sense?
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05-14-2023, 03:40 PM	#2
StradaRedlands Brigadier General 5037 Rep 3,089 Posts Drives: 2006 BMW 330i MT Join Date: Dec 2021 Location: SoCal iTrader: (2) Garage List 2006 BMW 330i [8.25] 2009 BMW 328i Touri ... [8.00] 2013 BMW X5 35i [7.80] 2011 BMW 528i [8.70] 2006 Mazda3 [5.50]	Interesting question... I wonder if there is a downside, either with fuel or maintenance?
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05-15-2023, 08:21 AM	#3
jadams161 First Lieutenant 175 Rep 345 Posts Drives: 2009 E93 335i. 2011 E90 328xi Join Date: Apr 2021 Location: Upstate New York iTrader: (1)	The DISA valve is required and an integral part of the air intake system and design. If the large valve has failed chances are the small valve is bad too. Always good to replace them both if unknown age and miles on them.
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