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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Asia > Hong Kong > Does it hurt the car to chronically drive in DS mode?



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      01-15-2010, 03:13 AM   #1
stevensonleehk
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Does it hurt the car to chronically drive in DS mode?

Just wondering whether constantly driving in DS mode will hurt the car. Any experiences? comments?
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      01-15-2010, 05:28 AM   #2
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I think Vincent can share his experience with you as he is driving 95% on China highway by this mod ^ ^
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      01-15-2010, 10:16 PM   #3
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I don't think there is any problem driving in DS mode all the time. BMW has well design on thier steptronic gear box. I drive 90% of my time using DS mode with manual shift. The other 10% of the time I drove in D mode is when i was in a traffic jam. I drive the car just like driving a manual most of my time.
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      01-15-2010, 10:31 PM   #4
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DS mode only hurts your wallet
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      01-15-2010, 10:36 PM   #5
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2 words only - ''EAT OIL''...LOL.
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      01-15-2010, 11:59 PM   #6
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DS mode only hurts your wallet
ha..ha..ha..
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      01-16-2010, 12:03 AM   #7
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2 words only - ''EAT OIL''...LOL.
tax .. is too high...!!! Demonstration..!!
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      01-16-2010, 10:58 PM   #8
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Originally Posted by Suri_ View Post
2 words only - ''EAT OIL''...LOL.
Spent most of the drive today in DS, my gas dropped by almost 2 full blocks!
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      01-18-2010, 06:33 AM   #9
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Steven,

I think the question is, would it heart the gearbox, to keep on changing between DS and D while driving?
I've researched on that adequately, and yet to find a convincing answer...
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      01-18-2010, 10:47 AM   #10
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Quote:
Originally Posted by Bimmer /E93 View Post
Steven,

I think the question is, would it heart the gearbox, to keep on changing between DS and D while driving?
I've researched on that adequately, and yet to find a convincing answer...
From my understanding, the D and DS modes of the car are just two different pre-programmed sequences for gear change at a certain rpm, depending on throttle depth and travelling speed, etc. So the action of switching between them in itself shouldn't hurt the car, unless you're worried about electronic issues (similar to the constant switching on/off of a lightbulb which may cause it to burn out prematurely). For that, I don't have an answer for you.

Now if you mean whether driving in D and suddenly switching to DS will hurt the engine, I stick to the theory that a car which only uses 2-3k rpm on the street will eventually get slower and slower, because of the gunk built up inside the engine during low engine speeds (the turbo system has an exhaust air recirculation system, which ends up bringing in some of the impurities in the fuel to the intake side straight back into the engine... a catch can mod should help too). If the car gets exercise chronically, this gunk actually gets cleared out of the car's system via the exhaust pipes, and is healthier for it.

As for gas prices and the extra burning of fuel... I agree with everything they said! LOL...
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      01-18-2010, 10:54 AM   #11
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Quote:
Originally Posted by phawx View Post
From my understanding, the D and DS modes of the car are just two different pre-programmed sequences for gear change at a certain rpm, depending on throttle depth and travelling speed, etc. So the action of switching between them in itself shouldn't hurt the car, unless you're worried about electronic issues (similar to the constant switching on/off of a lightbulb which may cause it to burn out prematurely). For that, I don't have an answer for you.

Now if you mean whether driving in D and suddenly switching to DS will hurt the engine, I stick to the theory that a car which only uses 2-3k rpm on the street will eventually get slower and slower, because of the gunk built up inside the engine during low engine speeds (the turbo system has an exhaust air recirculation system, which ends up bringing in some of the impurities in the fuel to the intake side straight back into the engine... a catch can mod should help too). If the car gets exercise chronically, this gunk actually gets cleared out of the car's system via the exhaust pipes, and is healthier for it.

As for gas prices and the extra burning of fuel... I agree with everything they said! LOL...
+1

This gunk is also called Carbon.
BMW build a lot of carbon inside the engine compartment. Driving from time to time during 5 min above 5000rpm keeps the engine clean for the same reasons you mentioned.
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      01-18-2010, 05:54 PM   #12
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Phawx: Tks for your input. If D & DS were only electronics switches and no mechanical switch is done... Why when you switch between both, you feel the gearbox is being mechanically switched? Wouldn't it be easier to make a button for the DS?
I think there is more to this than just a simple switch between 2 electronics pre-set programs????
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      01-19-2010, 10:50 AM   #13
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Quote:
Originally Posted by Bimmer /E93 View Post
Phawx: Tks for your input. If D & DS were only electronics switches and no mechanical switch is done... Why when you switch between both, you feel the gearbox is being mechanically switched? Wouldn't it be easier to make a button for the DS?
I think there is more to this than just a simple switch between 2 electronics pre-set programs????
I always thought the gear shift in autos had no direct connection to the gears themselves unlike a manual...? Maybe the ZF auto is different.

http://www.realoem.com/bmw/showparts...36&hg=25&fg=20

I think I'd need further diagrams to be sure, but from what it shows here it looks as if the auto tranny is just a big switch with a wire connecting somewhere else.

Someone correct me if I'm wrong!
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      01-20-2010, 11:00 PM   #14
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Quote:
Originally Posted by phawx View Post
I always thought the gear shift in autos had no direct connection to the gears themselves unlike a manual...? Maybe the ZF auto is different.

http://www.realoem.com/bmw/showparts...36&hg=25&fg=20

I think I'd need further diagrams to be sure, but from what it shows here it looks as if the auto tranny is just a big switch with a wire connecting somewhere else.

Someone correct me if I'm wrong!
http://www.europeantransmissions.com...W/6HP19bmw.pdf
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      01-21-2010, 03:45 AM   #15
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Thanks M_M! I think that confirms it...
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      01-22-2010, 02:57 AM   #16
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Thanks M_M, good to know that
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