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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Acceleration lag in 2007 328xi?



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      06-04-2009, 05:22 AM   #23
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Quote:
Originally Posted by KrysAlpineE92 View Post
It really isnt too horrific on the gas mileage and if your feeling hyped up and you wanna punch it and weave some that is definitely the mode to do it in.

You are right though...it's like driving a different car...I feel honored to have bought another BMW owner into the "DS" world haha.. Aren't you so much prouder of your cars capabilities now?
HAHAHHA thats cool brother

I am honored to be driving in the "DS" mode now, I was simply amazed, plus I got home 10 mins early..
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      06-04-2009, 11:03 PM   #24
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Quote:
Originally Posted by ska325xi View Post
try changing to a K&N air filter and remove the charcoal/carbon filter....a big improvement in throttle response, not big HP gains but it feels more alive
now do you mean? change the whole intake pipe? or just the filter? I'll do the carbon filter tommorow.

It really bothers me how we have: a resonator, cats, secondary cats and a muffler...it kills so much of the performance man
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      06-04-2009, 11:21 PM   #25
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Ever since I put in my AFE intake I pretty much only drive my car is DS mode. The engine noise after 3,000 RPM (with the intake) is awesome and the car has WAY more balls in DS. I switch back to D when I'm crusing down the highway. The effect on you gas milage is also slight.
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      06-04-2009, 11:22 PM   #26
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Quote:
Originally Posted by KrysAlpineE92 View Post
now do you mean? change the whole intake pipe? or just the filter? I'll do the carbon filter tommorow.

It really bothers me how we have: a resonator, cats, secondary cats and a muffler...it kills so much of the performance man
Get yourself a cold air intake and a BMW preformance exhaust; your car will thank you for it.
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      06-05-2009, 09:20 AM   #27
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Originally Posted by Delta0311 View Post
Get yourself a cold air intake and a BMW preformance exhaust; your car will thank you for it.
It's intake is definitely on my list of things to do. The first thing I did to my car when I got it is put on an eisenmann race exhaust and take out the resonator...Now i just wanna take out my secondary cats..and I'll be sounding pretty good.

EDIT: Oh I realize that I deleted it off my sig once i put the pic in
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      06-05-2009, 11:25 AM   #28
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Same problem with the delay here as well. I have an '07 328xi. I guess I'll be driving on DS on the highway until they get this resolved.
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      06-05-2009, 12:33 PM   #29
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Same problem with the delay here as well. I have an '07 328xi. I guess I'll be driving on DS on the highway until they get this resolved.
there are ways to resolve it...bmw wont do it for you...but you can do it easily. Let me know if you want more info.

Also, DS completely solves the problem...I think the regular Drive setting is more for economical driving
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      06-08-2009, 01:21 AM   #30
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I get that too. Just guessing here but the transmission wants to give you the smoothest ride possible. So when you wanna jump it the car kinda gets caught off guard and needs a second to figure things out.
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      06-08-2009, 08:05 AM   #31
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Quote:
Originally Posted by KrysAlpineE92 View Post
there are ways to resolve it...bmw wont do it for you...but you can do it easily. Let me know if you want more info.
I want more info.
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      06-08-2009, 11:01 AM   #32
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Quote:
Originally Posted by KrysAlpineE92 View Post
there are ways to resolve it...bmw wont do it for you...but you can do it easily. Let me know if you want more info.

Also, DS completely solves the problem...I think the regular Drive setting is more for economical driving
Why so cryptic? Just tell us what this solution is, already

If you're referring to having the transmission 're-learn' a more aggressive shift pattern by resetting it - that doesn't resolve the problem. We've already tried that.
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      06-08-2009, 01:17 PM   #33
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just try changing your air filter to K&N or some other brand (they DO NOT void warranty) and you'll see a difference.
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      06-08-2009, 01:21 PM   #34
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Quote:
Originally Posted by ska325xi View Post
just try changing your air filter to K&N or some other brand (they DO NOT void warranty) and you'll see a difference.
Thanks for the tip, Ill do that today.

Heres the part number for anyone interested.
http://www.knfilters.com/search/prod...x?Prod=33-2332
http://www.knfilters.com/search/appsearch.aspx
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      06-12-2009, 12:24 AM   #35
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Quote:
Originally Posted by nomile View Post
Why so cryptic? Just tell us what this solution is, already

If you're referring to having the transmission 're-learn' a more aggressive shift pattern by resetting it - that doesn't resolve the problem. We've already tried that.
my bad bro, I havent been on in the last few days. There several ways to get rid of the lag. All of which I have done. They are as followed:
-Tookout the carbon filter
-Changed the airfilter to a "better-breathing" alternative
-Spark plugs - Iridium are good, get a good brand - (this is a big one, It made a very noticeable difference to my throttle response)
-Final piece of advice. It's out of some people's modding comfort zones on there cars. But if you think that our exhausts have four emissions and noise muffling devices in them (resonator, cats, secondary cats and a muffler)...you know where your losing your responsiveness and potential power. If you removed just one of the emissions devices (usually the resonator is the first choice or the secondary cat removal is probably the most effective and makes you car sound better aswell as increasing responsiveness and performance.). Let me know if you need more info guys...i'll help all i can.

After doing all but one of those options I have damn nearly got rid of the lag altogether
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      06-12-2009, 10:00 AM   #36
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KrysAlpineE92 - Thanks for the tips. Need to look into those.

However, while I agree with all of the little mods to make the cars a bit more responsive, I feel that there's a major issue in the software that controls the transmission. My wife and I both drive 328xis. Hers is auto, mine is manual. Of course in a manual you get to choose what the transmission should be doing, but the auto is pathetically bad when it is asked to do what the OP states. Highest gear, slowing down, then go to WOT. It takes many seconds for the car to downshift all the way and really get on it. In the time it takes the car to downshift and figure out it's best operating point, you should already be back up to 50-60 mph, not waiting for the transmission to noodle its way down to the 'right' gear...
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      06-13-2009, 09:47 PM   #37
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DS doesn't shift into 6th gear though....might as well just use it for accelerating.
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      06-13-2009, 10:01 PM   #38
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Quote:
Originally Posted by nomile View Post
KrysAlpineE92 - Thanks for the tips. Need to look into those.

However, while I agree with all of the little mods to make the cars a bit more responsive, I feel that there's a major issue in the software that controls the transmission. My wife and I both drive 328xis. Hers is auto, mine is manual. Of course in a manual you get to choose what the transmission should be doing, but the auto is pathetically bad when it is asked to do what the OP states. Highest gear, slowing down, then go to WOT. It takes many seconds for the car to downshift all the way and really get on it. In the time it takes the car to downshift and figure out it's best operating point, you should already be back up to 50-60 mph, not waiting for the transmission to noodle its way down to the 'right' gear...
I agree 100%. Its so quirky and all over the place. Glad to hear others are experiencing this. I wonder if the dealer has any bulletins or complaints about this that are getting looked into by BMWNA?
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      06-16-2009, 11:08 PM   #39
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yea as much as I like DS and the steptronic for quick maneuvers...I'd much prefer a manual. If you think about it, even the DS is still programmed to be miserly on gas. You and I know darn well BMW de-tuned the engine to quiet the EPA. The N-54 is capable of so much more (with a set of turbos, reprogram, three-stage manifold.....aka a 335 lol).

But I'd still be the first in line for a high-performance hybrid lol.

Anyways, KrysAlpineE92, With the secondary cat removal how would one go about getting that done? Does it involve cutting or can it be removed and put back at any time?
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      06-17-2009, 08:20 AM   #40
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Originally Posted by iDriveaBimmer View Post
yea as much as I like DS and the steptronic for quick maneuvers...I'd much prefer a manual. If you think about it, even the DS is still programmed to be miserly on gas. You and I know darn well BMW de-tuned the engine to quiet the EPA. The N-54 is capable of so much more (with a set of turbos, reprogram, three-stage manifold.....aka a 335 lol).

But I'd still be the first in line for a high-performance hybrid lol.

Anyways, KrysAlpineE92, With the secondary cat removal how would one go about getting that done? Does it involve cutting or can it be removed and put back at any time?
The 328 and 330 use the N52 engine.
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      06-17-2009, 02:09 PM   #41
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ahh crap my bad I thought the 325/330 shared the same engine and the 328/335 shared the same engine. But either way the 328 is detuned.
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      06-18-2009, 11:54 PM   #42
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Originally Posted by iDriveaBimmer View Post
ahh crap my bad I thought the 325/330 shared the same engine and the 328/335 shared the same engine. But either way the 328 is detuned.
First of all, you were'nt far from wrong. It is in fact, the same 3.0L inline 6 engine. However, the N54 is the engine configuration with the turbos in the 335 and 535 and new z4 35i etc....and the N52 is naturally aspirated fuel injected. The N54 and 52 are the same engine they are configurations that are put in alot of BMW model's in either form. You probably already knew that.

Secondly, the secondary cat removal, could be done at your local muffler shop. What they would do is cut the cat up and fill the segment with welded and sealed pipe. It would still be legal with emissions regulations as far as I understand because a secondary catalyctic converter is completely uneccessary and it makes quite a big difference to the throttle response. The stock exhaust on all the N52's significantly reduces your performance and throttle response. It is also around 100 to 150 bucks depending on where you go because you dont need any parts besides the actual tube that they will have already at the muffler shop

I'm not sure on the legal aspects of removing the resonator, but, it also makes a difference to the throttle response and I have yet to do this. Still contemplating. You can see videos on youtube of the effects of the exhaust note without the resonator.
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Last edited by KrysAlpineE92; 06-18-2009 at 11:56 PM. Reason: innacurate info
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      06-20-2009, 11:01 AM   #43
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Originally Posted by KrysAlpineE92 View Post
The N54 and 52 are the same engine they are configurations that are put in alot of BMW model's in either form.
Not completely true - displacement is same, but materials, and fuel/air mixture delivery is different... From Wikipedia:
- N52 magnesium/aluminium DOHC 24v with Valvetronic & Double-VANOS
- N54 aluminium DOHC 24v twin turbocharged (Five International Engine of the Year awards)

N54 does not have Valvetronic.
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