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      10-27-2012, 03:33 AM   #1
Humble_Bear
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X1 Owners Do You Notice Throttle Lag?

I recall the 2 test drives with the X1 when accelerating from dead stop, I gently depressed the throttle for an inch and nothing happened. Can any X1 owner confirm this? The model I drove was s28i.
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      10-27-2012, 06:32 AM   #2
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When I floor it I have to wait .3-.5 sec before the turbo kicks in
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      10-27-2012, 08:38 AM   #3
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I think it may depend on if it's the 28 or 35. For me, I thought the 28 had more of a noticeable lag before the RPM changed but the two engines are basically the same (n20 is a n55 with 2 cylinders removed) so I'm wanting to lean towards the ZF 8HP transmission (which is also just a modified ZF 6HP with support for auto start/stop and 2 more gears) being the reason there is more of a pause on the 28 but I have no real data to back that up.
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      10-27-2012, 11:30 AM   #4
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I drove the N13 last week, also had a turbo lag with a manual. So I don't think it's the transmission.
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      10-27-2012, 11:54 AM   #5
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I am not referring to the turbo lag or transmission here, but the digital throttle lag. My question: is there a

(a) freeplay in the beginning travel of the throttle pedal, or
(b) a delay in the throttle esponse, or
(c) none

Help me do this test: put the gear in P and (a) slowly depress on the throttle pedal, and (b) quick jab on the throttle pedal, and see the different responses in the tachometer.
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      10-27-2012, 01:23 PM   #6
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Yes, there is some delay. It's very noticeable in comparison to my hyper sensitive M3 but for me it doesn't feel like a hindrance.
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      10-27-2012, 04:15 PM   #7
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Yes, this is the "electronic accelerator". No wire here. I also was a little bit concerned about it when I got my first roadtest. After a year, it is not bothering me at all. I think I kind of found a way to apply just the good amount of pressure to make the car going forward ... This is really a "no wire" particularity. No turbo lag at all here. But you definitly got a point here. There is some kind of a "dead zone" but this is due to the electronic and not the turbo.
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      10-27-2012, 05:37 PM   #8
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So is there a "free play" in the beginning of the throttle or is it a delay no matter how much you push down?
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      10-27-2012, 06:43 PM   #9
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Unfortunately it's likely the drive by wire, every BMW I've had/driven since my 2000 328ci ( which was prior to DBW) has suffered from varying amounts of lag due to it. Aftermarket software like Dinan can improve it but otherwise I've just relied on driving in sport modes with SMG, DSG or autos, and with a manual it just was a drag and had me looking at software upgrades. I really don't know why BMW is not improving the throttle responsiveness if they want to support the notion these are drivers cars

So it's worse on the 8 speed vs the 6 speed for sure?
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      10-28-2012, 01:09 AM   #10
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I experimented with this tonight. In park, it's responsive and rev happy. In D or N, if you tap the throttle for about 1-2cm, you can do it in a way that it doesn't do anything at all. There is definitely a gap in throttle for the first 5-10% of the pedal that is not present while in park. WTF?
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      03-05-2013, 09:21 PM   #11
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i test drove the 28i and noticed at least .5 sec of throttle lag... thats why i ended up getting the 35i. it would drive me nuts in everyday driving. the throttle lag existed regardless of whether you eased into the throttle or floored it immediately. its very common for 4-turbos but here its worse than i've seen in audi and vw 2.0Ts
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      03-05-2013, 09:30 PM   #12
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If you want the real performance on an X1, make sure you have DS mode on and not Eco mode.
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      03-05-2013, 11:32 PM   #13
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Quote:
Originally Posted by ddark13 View Post
i test drove the 28i and noticed at least .5 sec of throttle lag... thats why i ended up getting the 35i. it would drive me nuts in everyday driving. the throttle lag existed regardless of whether you eased into the throttle or floored it immediately. its very common for 4-turbos but here its worse than i've seen in audi and vw 2.0Ts
Yes, there is a slight but noticeable time delay when the throttle is first applied. It is not 'free play' or a 'gap' for the first 5-10% of throttle. If you hold the throttle at 5% the car will accelerate, slowly. However, if you are stopped and then stab the throttle to the floor and release it immediately, nothing happens! No engine revving, no car movement. It is annoying, but my Infiniti EX35 had the same thing so I kind of got use to it.

After doing some research, I decided to try the PedalBox. I just got around to installing it this past weekend. Unfortunately, the results were disappointing. It had no effect at all when doing the 'stab test' on any of the PedalBox settings. However, I did find a setting that I found a little more responsive and enjoyable in stop and go driving, so I think I'll keep it. But for most people I don't think it's worth the money.
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      03-06-2013, 12:22 AM   #14
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I've noticed this as well and have adapted by basically stepping hard on the gas (from a stop). I can't help but wonder if this isn't in some way connected to the the whole Automatic Start/Stop programming.
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      03-06-2013, 09:31 AM   #15
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sDrive28i. I do have a 1/2 second lag from the start in "drive". However in "park" there is no lag at all - engine revvs up the moment i tap the accelerator.
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      03-06-2013, 09:50 AM   #16
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Quote:
Originally Posted by Spinynorman View Post
Yes, there is a slight but noticeable time delay when the throttle is first applied. It is not 'free play' or a 'gap' for the first 5-10% of throttle. If you hold the throttle at 5% the car will accelerate, slowly. However, if you are stopped and then stab the throttle to the floor and release it immediately, nothing happens!
I tried this "stab" test from a stop this morning and my vehicle responds (without even hitting the floor). I never tried this before installing the BMS stage 1 tune but I have never experienced the extent of throttle lag others have reported over on the other forum. My X1 has very slight drive-by-wire lag on par with my 2009 128i and 335i. I'm not sure why the vast differences in experiences with the X1.

My other car is an S2000 so I should be even more sensitive to lag.

In ECO PRO I have significant lag even in P or N.
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      03-06-2013, 01:01 PM   #17
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Quote:
Originally Posted by BatManWins View Post
If you want the real performance on an X1, make sure you have DS mode on and not Eco mode.
Exactly. The throttle response is very good in DS mode. Also a lot of people are not familiar with turbo cars, and cars with modern auto transmissions which keep the revs very low. When you step on the gas, the transmission actually has to downshift several gears before you can accelerate out of the hole. Add to that the turbo lag. This is a fairly heavy car. When the turbo is not spooled, you can imagine this car being no different than a big heavy car with a 2.0 engine. In other words slow. It takes half a second for the turbo to spool. That could feel like an eternity for people not used to it.
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      03-06-2013, 01:08 PM   #18
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Solution is to reset the TBA ( Throttle body adaptation ) and here is how:

- Put the power on but do not start the engine.
- Floor the throttle for 30-60 seconds
- Keep the throttle to the floor and put the power OFF
- Release the throttle and wait 2 minutes.

During the 2 minutes you should feel or hear some kind of mechanical sound.

That should tell you the reset is complete.

Start the car and go notice that the "lag" is gone. The first 5 - 10 % is now engaging the transmission.

I've done it on my X1 and on the X3 of a friend.

Better this way.

Let me know how that work for you please ...

This should work for any Auto Tranny ( 1 series, 3 series, 5, X1, X3 ... ).

Have a nice day !
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      03-06-2013, 03:35 PM   #19
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Quote:
Originally Posted by icemilkcoffee View Post
Exactly. The throttle response is very good in DS mode. Also a lot of people are not familiar with turbo cars, and cars with modern auto transmissions which keep the revs very low. When you step on the gas, the transmission actually has to downshift several gears before you can accelerate out of the hole. Add to that the turbo lag. This is a fairly heavy car. When the turbo is not spooled, you can imagine this car being no different than a big heavy car with a 2.0 engine. In other words slow. It takes half a second for the turbo to spool. That could feel like an eternity for people not used to it.
+1
Let me add that DS mode shifts lightning quick while D asks "are you sure" at times before downshifting.
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      03-06-2013, 11:10 PM   #20
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Quote:
Originally Posted by nospam View Post
I tried this "stab" test from a stop this morning and my vehicle responds (without even hitting the floor). I never tried this before installing the BMS stage 1 tune but I have never experienced the extent of throttle lag others have reported over on the other forum.
Well, that sounds encouraging that a tune can eliminate or at least minimize the delay. I would add that my testing was all in DS mode. Almost all of my driving is in DS mode using the paddle shifters. I will try the TBA reset procedure when the roads aren't so icy in a couple of days.
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      03-07-2013, 09:27 AM   #21
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Quote:
Originally Posted by icemilkcoffee View Post
Exactly. The throttle response is very good in DS mode. Also a lot of people are not familiar with turbo cars, and cars with modern auto transmissions which keep the revs very low. When you step on the gas, the transmission actually has to downshift several gears before you can accelerate out of the hole. Add to that the turbo lag. This is a fairly heavy car. When the turbo is not spooled, you can imagine this car being no different than a big heavy car with a 2.0 engine. In other words slow. It takes half a second for the turbo to spool. That could feel like an eternity for people not used to it.
This has been discussed in several BMW threads already and has nothing to do with the turbo or turbo "lag". It doesn't exist on manual BMW's and I had the same issue on a 2007 BMW X3 with a non turbo 3.0 issue which went to BMW twice to be reprogrammed.
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      03-07-2013, 12:19 PM   #22
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I associate this lag with any automatic. And BMW is shorter than most. There are days when driving my manual TDI is more fun.

The lag gets ridiculous if you turn on eco-mode. I have to push the accelerator half way to the floor before I get any acceleration in the slightest (ie, before the car actually responds and moves).
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