Should my new 128i be lagging on acceleration??

1HungryMan · 09-05-2008, 05:33 PM

Love my car, but wondering whether it is normal to have a slight lag on acceleration a) as part of the break-in period or b) simply because it's not the 135?

My friend who's a car guy said it was a "transmission issue" (issue???).

Not worried, just wondering if I'm missing something. I'm not a car guy, but a guy who loves this car.

Thanks!

InsaneSkippy · 09-05-2008, 05:44 PM

Stick or automatic? If it's an automatic do you have it in sport mode?

Swift135 · 09-05-2008, 05:55 PM

It's the induction system switching from economy to power, it takes a second to wind open. In the 135 they have the older style VANOS system this added to slight turbo lag (there has to be lag due to the nature of the turbo) then people start complaining about lag. If people want power and throttle response they need a big engine with individual throttle bodies aka e92 M3.

Robert · 09-05-2008, 06:33 PM

^ Yup, that's the strangest sensation I got on my first 328i drive. DS or M solves the problem and that is the reason which convinced me to take a plunge and get a manual.

Blacky · 09-05-2008, 06:36 PM

Is this just a perception with the electronic throttle?
I found it quite different when I changed cars and the difference in the feel / response from the actual pedal push to the way the car went.
Now it just feels normal but at the time it was a little weird!

Mad Dragon · 09-05-2008, 06:52 PM

Quote:

Originally Posted by Swift135

It's the induction system switching from economy to power, it takes a second to wind open. In the 135 they have the older style VANOS system this added to slight turbo lag (there has to be lag due to the nature of the turbo) then people start complaining about lag. If people want power and throttle response they need a big engine with individual throttle bodies aka e92 M3.

Every BMW has VANOS. The Valvetronic lift control system in the 128i uses a 100A motor, so "throttle" response is near-instantaneous.

1HungryMan · 09-05-2008, 06:56 PM

Quote:

Originally Posted by InsaneSkippy

Stick or automatic? If it's an automatic do you have it in sport mode?

Automatic. Don't know what you mean by sport mode (runs for cover!!!)

1HungryMan · 09-05-2008, 06:57 PM

Quote:

Originally Posted by Swift135

It's the induction system switching from economy to power, it takes a second to wind open. In the 135 they have the older style VANOS system this added to slight turbo lag (there has to be lag due to the nature of the turbo) then people start complaining about lag. If people want power and throttle response they need a big engine with individual throttle bodies aka e92 M3.

Thanks for the explanation.

Swift135 · 09-05-2008, 07:20 PM

Quote:

Originally Posted by Mad Dragon

Every BMW has VANOS. The Valvetronic lift control system in the 128i uses a 100A motor, so "throttle" response is near-instantaneous.

The throttle response may be near instant but the onset of good acceleration may be the delay, BMW may have more aggressive valve timing map in the auto DS mode (at the detriment of economy) for more rapid onset of acceleration.

mistermojorizin · 09-05-2008, 07:23 PM

you guys with the step can try the 25 sec reset trick that works on other bmws. with the engine off, but with all the accessories turned on (press start button a couple times), hold down the gas pedal for 25 secs. then just start the car.

a common response after doing this is "i never thought i would like to drive it in D"

warmtoes · 09-05-2008, 07:24 PM

Quote:

Originally Posted by 1HungryMan

Automatic. Don't know what you mean by sport mode (runs for cover!!!)

I don't know about the 128 but in the 135 if you are in drive and you pull the shift lever to the left towards you it goes into sport mode and it shows as DS on the LCD between your speedo and tach.

It basically remaps the throttle response to be very sensitive and makes the gears change at or near red line.

1Ronnie · 09-05-2008, 10:55 PM

Quote:

Originally Posted by mistermojorizin

you guys with the step can try the 25 sec reset trick that works on other bmws. with the engine off, but with all the accessories turned on (press start button a couple times), hold down the gas pedal for 25 secs. then just start the car.

a common response after doing this is "i never thought i would like to drive it in D"

Interesting, I didn't know BMW did it, Mitsubishi made a big deal of this a few years back. The car watches your driving style, and adjusts throttle response over time based on that. Resetting the Throttle style will temporarily set the car back to default, which MAY be a little more agressive.

Personally I think pushing the stick over to Sport is by far the most affective way of getting more fun per foot press :wink:

Mad Dragon · 09-06-2008, 12:05 PM

Quote:

Originally Posted by Swift135

The throttle response may be near instant but the onset of good acceleration may be the delay, BMW may have more aggressive valve timing map in the auto DS mode (at the detriment of economy) for more rapid onset of acceleration.

DS only affects the transmission's shift points. It does nothing to the engine.

Quote:

Originally Posted by mistermojorizin

you guys with the step can try the 25 sec reset trick that works on other bmws. with the engine off, but with all the accessories turned on (press start button a couple times), hold down the gas pedal for 25 secs. then just start the car.

not this crap again... BMW transmissions do not store long-term adaptations based on driving style.

http://forums.bimmerforums.com/forum...1&postcount=29

warmtoes · 09-06-2008, 02:25 PM

Quote:

Originally Posted by Mad Dragon

DS only affects the transmission's shift points. It does nothing to the engine.

True, it does nothing to the engine but it not only changes shift points it makes the throttle response a lot more resposive.

1HungryMan · 09-06-2008, 04:51 PM

Switched to sport mode and the thing explodes out of the gate! Thanks!

x97Melbourne · 09-06-2008, 05:41 PM

every automatic ive ever driven has a minor lag before power hits in. this is one of the "cons" to getting an automatic.

warmtoes · 09-07-2008, 08:14 PM

Quote:

Originally Posted by x97Melbourne

every automatic ive ever driven has a minor lag before power hits in. this is one of the "cons" to getting an automatic.

I haven't noticed any lag in this auto. The torque converter locks at launch supposedly so I wouldn't expect any lag.

09-05-2008, 05:33 PM	#1
1HungryMan Lieutenant 24 Rep 536 Posts Drives: 2008 128i Join Date: Mar 2008 Location: Toronto iTrader: (0)	Should my new 128i be lagging on acceleration?? Love my car, but wondering whether it is normal to have a slight lag on acceleration a) as part of the break-in period or b) simply because it's not the 135? My friend who's a car guy said it was a "transmission issue" (issue???). Not worried, just wondering if I'm missing something. I'm not a car guy, but a guy who loves this car. Thanks!
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09-05-2008, 05:44 PM	#2
InsaneSkippy Lieutenant Colonel 79 Rep 1,597 Posts Drives: 135i Join Date: Jul 2007 Location: Florida iTrader: (1)	Stick or automatic? If it's an automatic do you have it in sport mode? __________________
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09-05-2008, 05:55 PM	#3
Swift135 Lieutenant 23 Rep 453 Posts Drives: 330d, M3 DCT E92 Join Date: Jan 2008 Location: Brisbane iTrader: (0)	It's the induction system switching from economy to power, it takes a second to wind open. In the 135 they have the older style VANOS system this added to slight turbo lag (there has to be lag due to the nature of the turbo) then people start complaining about lag. If people want power and throttle response they need a big engine with individual throttle bodies aka e92 M3. __________________
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09-05-2008, 06:33 PM	#4
Robert Major General 417 Rep 6,968 Posts Drives: 135i -> is350 -> Tesla M3 perf Join Date: Aug 2005 Location: Socal iTrader: (1)	^ Yup, that's the strangest sensation I got on my first 328i drive. DS or M solves the problem and that is the reason which convinced me to take a plunge and get a manual. __________________ - There's nothing in my pocket other than knives and lint
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09-05-2008, 06:36 PM	#5
Blacky Lieutenant 14 Rep 472 Posts Drives: Join Date: Mar 2006 iTrader: (0)	Is this just a perception with the electronic throttle? I found it quite different when I changed cars and the difference in the feel / response from the actual pedal push to the way the car went. Now it just feels normal but at the time it was a little weird!
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09-05-2008, 07:23 PM	#10
mistermojorizin Lieutenant Colonel 40 Rep 1,657 Posts Drives: 135i Join Date: Apr 2008 Location: Los Angeles iTrader: (0)	you guys with the step can try the 25 sec reset trick that works on other bmws. with the engine off, but with all the accessories turned on (press start button a couple times), hold down the gas pedal for 25 secs. then just start the car. a common response after doing this is "i never thought i would like to drive it in D" __________________ "KOPEYKA" /// Titanium Silver / Black Leather / Gray Poplar / Sport Package / Premium Package / 6MT / Feb 08 Production
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09-06-2008, 04:51 PM	#15
1HungryMan Lieutenant 24 Rep 536 Posts Drives: 2008 128i Join Date: Mar 2008 Location: Toronto iTrader: (0)	Switched to sport mode and the thing explodes out of the gate! Thanks!
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09-06-2008, 05:41 PM	#16
x97Melbourne Molar World 47 Rep 916 Posts Drives: 2016 435i Coupe Join Date: Apr 2008 Location: Florida iTrader: (0)	every automatic ive ever driven has a minor lag before power hits in. this is one of the "cons" to getting an automatic. __________________ Current: 2016 435i Coupe Previous: 2014 335i Sedan; 2013 328i Cv, 2011 335i Sedan Gone But Not Forgotten: 2008 135i Convertible (my favorite)
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