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      10-28-2012, 12:06 PM   #1
popopine
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Hesitation off the line

One thing that has bothered me about my X1 is the pause you get when you hit the gas off the line. Not sure if all of you have experienced it but i know many have – And not just with the X1. So i did some research and found this possible solution. Have not tried it but i'm hoping if it doesn't work, BMW will come out with a SoftW fix.

RESET
1) hit start button once to turn on power (Don't start the engine)
2) then press the accelerator down to the floor for 5 sec
3) then hit start button once to turn off power
4) then remove foot from accelerator
5) then waite for 2 minutes
4) then start the engine like normal and try it out! "

Last edited by popopine; 10-28-2012 at 02:07 PM.
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      10-28-2012, 03:41 PM   #2
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And just where did you get this wonky solution?
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      10-28-2012, 03:54 PM   #3
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I thought software resets were just good for resetting away any learned behavior if the transmission is adaptive.
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      10-28-2012, 06:24 PM   #4
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I've noticed the hesitation on my X1 with the N20 engine. Motortrend had a long term 2011 X3 with the 6 cyl having the same problem. They had a software update that solved it (http://www.motortrend.com/roadtests/...verdict/?ti=v3). Hopefully our cars will have the update soon.
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      11-09-2012, 02:27 PM   #5
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Quote:
Originally Posted by waltermus View Post
I've noticed the hesitation on my X1 with the N20 engine. Motortrend had a long term 2011 X3 with the 6 cyl having the same problem. They had a software update that solved it (http://www.motortrend.com/roadtests/...verdict/?ti=v3). Hopefully our cars will have the update soon.
I hope so! The engine is perfect except for that little pause when you hit the gas.
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      11-09-2012, 03:51 PM   #6
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Its called turbo lag, the 6 cylinder has the same thing.
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      11-09-2012, 06:44 PM   #7
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(1) Throttle lag from drive-by-wire(software) + (2) turbo lag
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      11-09-2012, 10:07 PM   #8
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Quote:
Originally Posted by Humble_Bear View Post
(1) Throttle lag from drive-by-wire(software) + (2) turbo lag
Damn turbo lag!

So the first 1000 miles i drove like a granny to break her in. Perhaps if i were to gun it off the line a few dozen times, the software might relearn and clean the take-off up a bit?
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      11-10-2012, 02:22 AM   #9
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The proper way to break in an engine is not to baby it or drive at a steady speed, but to vary the speed so the piston rings can be properly seated. You are talking about transmission software that has nothing to do with the drive-by-wire lag or turbo lag and it has short term memories, certainly won't remember how you drove 1000 miles ago.
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      11-10-2012, 04:21 PM   #10
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Quote:
Originally Posted by Humble_Bear View Post
The proper way to break in an engine is not to baby it or drive at a steady speed, but to vary the speed so the piston rings can be properly seated. You are talking about transmission software that has nothing to do with the drive-by-wire lag or turbo lag and it has short term memories, certainly won't remember how you drove 1000 miles ago.
I see. That certainly makes sense, thanks.
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      11-10-2012, 06:03 PM   #11
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Quote:
Originally Posted by djminkin View Post
Its called turbo lag, the 6 cylinder has the same thing.
It's not turbo lag and has nothing to do with the turbo. My 2007 X3 with a 3.0 engine was really bad and it didn't have a turbo it was software programming. They reprogrammed it twice which got it better but never totally corrected it.
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      11-10-2012, 09:00 PM   #12
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Yeah it's definitely not turbo lag. It's just a really laggy throttle. You can sit in D and repeatedly tap the throttle and it won't do anything. There's seriously a 1-2 second delay and it's borderline dangerous when trying to accelerate from a stop. Interestingly (and frustrating), there is no lag when in park!

I'll be speaking with my dealership this week. We need some more responsive software badly.
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      11-11-2012, 07:53 AM   #13
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Quote:
Originally Posted by Transfer View Post
You can sit in D and repeatedly tap the throttle and it won't do anything. There's seriously a 1-2 second delay and it's borderline dangerous when trying to accelerate from a stop. Interestingly (and frustrating), there is no lag when in park!
I think this is the "Turbo Lag".

The turbo turbine is directly connected exhaust of your engine, the higher the engine's rev speed the more turbo boost you will get

When you are in P or N, the rev speed can built up quickly because there is no load on the engine. Whereas if you are in D, the engine is now connected to the shaft, and your car is stationary, therefore, it is much slower to built up the rev.

We need to understand there is a "Turbo Lag" in all turbo engines. When the turbo engine is idling you just have a 2 liter naturally aspirated engine under the hood.

Power and Torque of the BMW 28i turbo engine:



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Last edited by dchao; 11-11-2012 at 08:09 AM.
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      11-11-2012, 08:04 AM   #14
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You are correct, you do need to understand turbo lag. Your car is not powered by a turbo, it is powered by an engine with a turbo attached to it. That engine makes power regardless of the turbo and has no lag. The additional power of the turbo does have lag, but that is clearly not what is being seen in take off hesitation.
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      11-11-2012, 08:25 AM   #15
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      11-11-2012, 08:30 AM   #16
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My previous car was Passat with the vw/audi 2.0 turbo engine and it would not give me this kind of lag.I also drove a turbo that have lag and the car would go once you step on the gas just not as fast but once the turbo power kick in the car would jump off and surprise you. It is kind of like when you have the ECO turn on and you drive normally which is quite slow and laggy then you step down the gas and the engine give you full power. The different is turbo lag preforme the same no matter how much gas you apply.

Right now we are talking about throttle delay in this case the car would not go at all for about half second; no matter how much gas apply. And you can also see the engine rpm was not going up at all duing that half second which mean the engine wasn't even 'getting order' from the ecu to move.

Prehap most people never drove a turbo before so think this is a turbo lag?
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      11-11-2012, 08:48 AM   #17
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I am from the UK, and we don't get the X1 28i here. So yes, that was my opinion, as I had never driven the 28i. But when I test drove the 20d, and 25d here (different engines), I didn't feel the any "throttle lag".
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      11-11-2012, 12:07 PM   #18
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Yeah seriously it is NOT turbo lag. It is poor throttle response, end of story. I've had VW and WRX turbos in the past and turbo lag is power lag but not rev lag.
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      11-11-2012, 06:40 PM   #19
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Quote:
Originally Posted by Transfer View Post
Yeah it's definitely not turbo lag. It's just a really laggy throttle. You can sit in D and repeatedly tap the throttle and it won't do anything. There's seriously a 1-2 second delay and it's borderline dangerous when trying to accelerate from a stop. Interestingly (and frustrating), there is no lag when in park!

I'll be speaking with my dealership this week. We need some more responsive software badly.
PLease let us know what your dealer says. thanks!
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      11-28-2012, 10:18 AM   #20
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Alright, car is going in today to change auto start/stop and evaluate throttle response from a stop. I searched and this has been an ongoing issue in the 3 series for a while. I'm not gonna hold my breath that they'll actually do anything about this.
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      12-02-2012, 10:53 PM   #21
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Update: They put our auto start/stop to save last setting but that was all they could do. There was nothing abnormal with the throttle response which is what I expected them to say.

As a semi-side note, when auto start/stop was on, we have had it auto restart in neutral on 2-3 different occasions and when you hit the gas it just revs until you put it in drive. They told us that this is apparently a known issue at the moment and there is presently no fix! We'll be driving with ASS off at all times.
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      12-02-2012, 11:14 PM   #22
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Quote:
Originally Posted by Transfer View Post
Update: There was nothing abnormal with the throttle response which is what I expected them to say.
That's too bad, the sDrive 28i I just test drove had the initial dead throttle response, it really was noticeable when getting on the gas from a stop. I don't recall the same thing on the 35 I tried but that was some time ago and I need to try one again. (I am having a hell of a time finding cars to test drive, still need to try an xDrive28i preferably without servo). Once it gets going its good, but the drive by wire could really use improvement. Perhaps Dinan will offer some software upgrade

At least you have it so the ASS will not default to on, the sales person appeared shocked that I didn't want to try that out
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