Acceleration Lag in 3.0 & 4.8?
 

I read on other forums that people are experiencing a lag (about 1 second or so) prior to initial acceleration. Often times the problem appears hundreds of miles after they have took deliver of the car. And has been attributed to the transmission adapting to the driving style of the driver.

I'm taking into account that this lag might be subjective, so I've gone out to test drive the 4.8 a few times to see if I can imitate this experience. Often times driving more aggressively and other times more relaxed. I've even noted driving it in the two different modes using the sports button below the shifter. (The DS mode, by moving the shifter is just crazy awesome. No lag whatsoever). Till now, all my experiences with the 4.8 has not reproduced the lag. (Great news to my ears).

For kicks, I tried the 3.0 yesterday. And the lag was completely noticeable and unacceptable! Yikes!

My question is: How many people with 4.8 have experienced this lag (or have not experienced this lag)?

I have 4.8 and there is not lag. you press you go.
my 335 have lag. turbo's!

My 2007 3.0si had lag, my 2008 4.8i does not have any lag.

I'm surprised there's lag in a 335i. The twin turbo should do away with that. All reviews say how impressed they are with no lad. Odd.

Test drove both 3.0 & 4.8, experienced the lag in both. I still bought it hoping it would be better and while it's still there, I've adapted to driving expecting it to be there so I'm a little heavier on initial acceleration, which makes up for it and it no longer bothers me at all.

i test drove a 4.8 prior to purchase and did notice a bit of lag on a demo vehicle with just over 10k miles on it...

my 3.0si has the very same lag (a fraction of a second) but only when i stomp the gas hard... in smoother acceleration (progressively pressing the gas as i'm accelerating) i'm actually quicker and there's no lag... it's pretty fast...

on DS mode...no lag whatsoever... pulls hard and with no hesitation..

Thanxs guys for the replies. Does anyone consistently drive in DS mode in a 3.0/4.8? What are your average MPG's in doing so? Please also state which model 3.0/4.8.

i have the 3.0d and whenever i need to accelereate hard, i shift in ds mode, but when i need to coast or relax then normal d is fine..

i have driven 2050 km, and with ds mode i get about 15mpg (i converted from metric units - 6.4km/litre)

highway i get about 12 km/litre which is about 30mpg..

yall must have a different definition of lag?

Drive by wire has been the definition, or rather the cause... it has to send a signal and let's just say it's not an instant response, especially compared with older cars. Coming from a '95 vehicle, the difference in response time is night and day.

would a grounding kit (for the engine) do away with the lag, because my friend got the new mitsubishi lancer and he had the same "lag" he but a grounding kit on it, and (supposedly) theres no more lag... and now he spanks me off the line...

the grounding kit is supposed to even out negative with positives, anbd optimizes all electric stuff in the vrehicle...

The speedbooster thread would help people who care about the lag... ;)

:throw: :rofl:

The lag is off the line if you kick it but it's short lived and IMO only a lag as compared to the earlier model years (2000-2003 or so) Sports mode, none whatsoever :D MPGs suck, I'm down to 12.5 (4.8i) but I'm having fun.

Blame Valvetronic. While part of it has to do with right foot discipline, Valvetronic certainly softens the throttle response.

I'm surprised Michelle hasn't put her comments here regarding lag and the 3.0si.:rofl:

Ah so that's what it is. I've always wondered why I hear more issues with lag with newer cars. I've never experienced these problems with cars I've owned prior to 2004.

My first experience with unreasonable lag was in a 04' E320. I got rid of that car once the lease was up. Had a horrible time driving it. I initially blamed it on the bad 5 speed trasmission (newer MB's use the 7 speed). But after speaking to various service techs, attributed the cause to the "adapative transmission".

About to pull the trigger on a 4.8. Keeping my fingers crossed. I guess at least there is DS mode. But gas is so expensive now. Not quite in the financial category as others that have money to burn, but also not in the category of getting a car I can't afford.

i have heard from my tech that if you turn off DSC you can lite up the tires almost instantaneously. the AWD contributes to the "lag" as it must compute traction available prior to launch.

squeeze the throttle, it is not an on /off switch. ;)

I know this very well. If you treat the gas pedal like a switch in my X3 (or older BMWs), you'll give everyone in the car whiplash because the vehicle will jolt forward due to poor foot discipline. My dad is a great example of this. (He blames the gearbox :rofl: )

The AWD X3 2.5i responds better to my right foot than the '06 325i, which has Valvetronic and is rear-wheel drive. Thus, I want to blame it on the new engine system. DSC has no effect on responsiveness.