What happens to the DISA stages when I drive at 3000rpm?

Phyrexia · 09-16-2018, 10:31 PM

Is the DME in our cars smart enough to not constantly engage and disengage the first DISA stage if I cruise down the highway such that the motor is oscillating between 2950 and 3050 RPM?

bmwcar · 09-17-2018, 05:07 AM

It's activated and disactivate at diferent rpm points, so it doesnt activate/disativate non-stop while running at same rpm. stage 1 3120/3270 or 4250/4470

Taskmaster · 09-17-2018, 12:01 PM

Quote:

Originally Posted by bmwcar

It's activated and disactivate at diferent rpm points, so it doesnt activate/disativate non-stop while running at same rpm. stage 1 3120/3270 or 4250/4470

I believe it's also based on load and a bunch of other factors as well.

atmosphericM · 09-17-2018, 02:41 PM

Hey, glad you posted this. I was wondering the exact same thing the other day. Guess I was too lazy to really learn and also just assumed (hoped) that BMW would have thought of this themselves.

After reading about all of these bad DISAs, I'm over here stressing about when mine might fail. Annoying that apparently the only way to know they've even failed is to simply realize that the power is not there.. which not everyone would do.

hassmaschine · 09-17-2018, 02:51 PM

yeah, it's not going to switch on/off constantly if you're driving at one RPM, even if it's between setpoints.

atmosphericM · 09-17-2018, 02:56 PM

I'm really hoping it's based upon more than JUST RPM though, because one could easily be frequently going up and down in that 150-200 RPM range while driving on the highway especially when not using "cruise control" (I never do).

Off the top of my head though, I can't remember what RPM I'm near on the interstate.

09-16-2018, 10:31 PM	#1
Phyrexia Resident Pedant 511 Rep 795 Posts Drives: '15 335i 8AT Join Date: Nov 2017 Location: Limbo iTrader: (1)	What happens to the DISA stages when I drive at 3000rpm? Is the DME in our cars smart enough to not constantly engage and disengage the first DISA stage if I cruise down the highway such that the motor is oscillating between 2950 and 3050 RPM? __________________ '15 F30 335i 8AT Estoril II/Black (12.218 @ 114.94mph) MHD Stage 2+ 93 / XHP Stage 3 / M-Goodies / K&N Filter / ER CP / CSF IC / NGK 97506 / ER DP / Michelin A/S 3+ Last edited by Phyrexia; 09-16-2018 at 10:59 PM..
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09-17-2018, 05:07 AM	#2
bmwcar Private 8 Rep 57 Posts Drives: BMW 125i E88, 118D F20 Join Date: Aug 2009 Location: C iTrader: (0)	It's activated and disactivate at diferent rpm points, so it doesnt activate/disativate non-stop while running at same rpm. stage 1 3120/3270 or 4250/4470
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09-17-2018, 02:41 PM	#4
atmosphericM Basic Bimmer 523 Rep 930 Posts Drives: E92 328i 6MT ///M Join Date: Sep 2017 Location: B'ham iTrader: (1) Garage List 2013 BMW 328i Coupé ... [10.00]	Hey, glad you posted this. I was wondering the exact same thing the other day. Guess I was too lazy to really learn and also just assumed (hoped) that BMW would have thought of this themselves. After reading about all of these bad DISAs, I'm over here stressing about when mine might fail. Annoying that apparently the only way to know they've even failed is to simply realize that the power is not there.. which not everyone would do. __________________ Black Sapphire 328i ///M Sport Coupé Save the Manuals!
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09-17-2018, 02:51 PM	#5
hassmaschine Major General 3989 Rep 7,212 Posts Drives: "NBO" 330i Join Date: Jun 2014 Location: earth iTrader: (0)	yeah, it's not going to switch on/off constantly if you're driving at one RPM, even if it's between setpoints.
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09-17-2018, 02:56 PM	#6
atmosphericM Basic Bimmer 523 Rep 930 Posts Drives: E92 328i 6MT ///M Join Date: Sep 2017 Location: B'ham iTrader: (1) Garage List 2013 BMW 328i Coupé ... [10.00]	I'm really hoping it's based upon more than JUST RPM though, because one could easily be frequently going up and down in that 150-200 RPM range while driving on the highway especially when not using "cruise control" (I never do). Off the top of my head though, I can't remember what RPM I'm near on the interstate. __________________ Black Sapphire 328i ///M Sport Coupé Save the Manuals!
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