[Christos]

Couple questions. I have a 10/2007 E92 with AT. I don’t think I have lag, but as stated many times, by many, the torque pull is not really present until around 3000 rpms at least.

Questions:

1. If I am in 4th gear and turning a corner with rpm’s around 2200, shouldn’t I technically have max torque 300 ft/lbs and have tons of pull through? I don’t by the way and the car seems sluggish, until 3000 rpms

2. The reason one downshifts a car is to get the rpms up into the peak of the torque curve for the greatest power, correct??

3. No matter what gear I am in, 6th through 1st, if the rpms are above 1400, then I should feel the max pull??

[meyergru]

Originally Posted by Christos

1. If I am in 4th gear and turning a corner with rpm’s around 2200, shouldn’t I technically have max torque 300 ft/lbs and have tons of pull through? I don’t by the way and the car seems sluggish, until 3000 rpms

You should.

Originally Posted by Christos

2. The reason one downshifts a car is to get the rpms up into the peak of the torque curve for the greatest power, correct??

No. You downshift to change gearing so that the torque applied to the wheels is higher. There is a limit to this, and that is max RPM. Theoretically, you could have less torque with higher RPMs, but in the 335i, that effect is almost always compensated by better gearing. That means, even if torque is beginning to fall over 5500 RPM, a higher gear and less RPM is always worse effective-torque-wise.

Originally Posted by Christos

3. No matter what gear I am in, 6th through 1st, if the rpms are above 1400, then I should feel the max pull??

At least that is what BMW promised: nearly constant pull from 1400-5500 RPM. Whereas, "max pull" means "in that particular gear". You could feel even more effective pull by lowering gear, as I wrote above.

[Rando]

Keep in mind that traction control can limit your response in 1st and 2nd, because there may be too much torque for your tires. Especially in 1st, it's quite hard to judge.

A higher gear is a better way to check if you're getting full torque. For example, 40 mph in 6th, 40 mph in 5th, 30 mph in 4th, 20 mph in 3rd -- and then full throttle (if you have auto, don't press the kick-down switch with the pedal, obviously, because that will jump to another gear).

As the RPM builds (in the same gear), you should feel roughly the same amount of push throughout, rather than a huge jump at 3000 RPM. The latter is what people with 29.2+ seem to be experiencing.

It would be great if someone with 29.2+ would do this to confirm...

[swartzentruber]

Originally Posted by Rando

It would be great if someone with 29.2+ would do this to confirm...

Actually, I already have tried to do this and reported it earlier in the thread (I have Apr08 build, presumably 29.2+), and wasn't believed (or was told that since I haven't driven one with <29.2, I didn't know what to look for). I'm certainly up for more testing, but it's not worth it if I get similar responses from people only looking for a confirming response of lag. I can state unequivocably that my car does not feel sluggish below 3000rpm, and I can feel good boost beginning around 1.5k rpms. It does feel similar to what others have described with the 2009s. I have a hard time confirming if it feels like full torque at 1.5k, but it builds smoothly, and I can't detect a noticeable change at 3k rpms.

There are also a couple of factors that may be working against my ability to test this well. One is that I have a fairly short commute, and I know the wastegate behavior changes once the engine warms. Does anyone know when it changes (i.e. after the first couple minutes, or does the oil temp needle need to be moving up)? I want to make sure I'm not testing it during the "cold engine" program. The second factor is that my car is fairly new (<1500 miles). I haven't been driving it much because I put snows on fairly early, and it's been unseasonably warm here in Chicago, although that should change this weekend. It could be that the lag behavior changes a bit once miles are accumulated, and the wastegates have more use on them. If that is a factor, perhaps a tester with more miles would be better.

[Prof3ssor]

I think we need to start a new thread for people that bought the car with 29.2 and have never experienced driving a pre 29.2. This thread should be people that were pre 29.2 and were upgraded.

[clivem2]

Originally Posted by Prof3ssor

I think we need to start a new thread for people that bought the car with 29.2 and have never experienced driving a pre 29.2. This thread should be people that were pre 29.2 and were upgraded.

My July 08 build with 30.0.2 is close to swartzentruber's description. I do feel there's more torque over 3k but there's a smooth build. There is very significantly more torque at low revs than I had with my E46 330i. The turbos are doing something, I totally accept that it seems like they are not delivering as a pre-29.2 car would. Believe me when I say that I'd love for my car to perform like a pre-29.2. But....it does seem like there are a number of people here who have real problems with their cars below 3k rpm. If such descriptions are accurate then these cars are way worse than mine. As we've discussed in the past there are a number of variables in play here. I don't believe all cars are performing anything like equally, even with when classified by the same software revision. Just because someone has a different experience does not make them wrong or only suitable for being ostracized to another thread.

[4 Diamonds]

Originally Posted by Prof3ssor

I think we need to start a new thread for people that bought the car with 29.2 and have never experienced driving a pre 29.2. This thread should be people that were pre 29.2 and were upgraded.

+1

[bmrm396]

+1

[shaddai]

Originally Posted by Prof3ssor

I think we need to start a new thread for people that bought the car with 29.2 and have never experienced driving a pre 29.2. This thread should be people that were pre 29.2 and were upgraded.

-1

We're affected by the same issue regardless of the car's original state.

[**335i**]

i have 29.1.1 version do i only one have this version in here?

[Tschuss]

A promising post?

http://www.e90post.com/forums/showthread.php?t=184400

Here's the text:

Originally Posted by Spydeputy

Well fellow Bimmers, 1st a little back round. My 2008 E90 335xi was one of the first ones built. My car was ordered around the beginning of July 07. Arrived at BMW, Bel Air, MD. 1 Oct 2007. and was delivered 3 Oct 07.

I am new to BMW, but not lux. sport cars.
I have owned, 2 Volvo S60 AWD Turbos,(neither had turbo lag that I was aware of), and I sold my 2006 Audi A4 Quattro 3.2 S-line, to buy my current 1st BMW. I had no problems at all until I had Bluetooth / Sat. radio / mirror-seat settings/ being lost. So... I got the newest software that had just came out the day before, according to my SA on 30 Apr 08. As not being member yet of this forum, or BMW CCA. I had not heard the rumors about turbo lag yet. But my SA did confirm then, that it was V29.2.0 installed on BMW.

I work in the area of Bel Air BMW, and had gotten to know service, parts, and sales staff quite well, on my many friendly visits. The owner of Bel Air & Towson BMW, had even given me passes to the car shows in Washington DC, and Baltimore, (DC was the best). I'm still waiting for BMW's front strut brace for a 335xi, the strut towers are more vertical that the non AWD's, and the turbos take up to much room under the hood for the brace to fit right now. I'm hoping it will be out soon. I frequently spoke w/ Joe the top service tech in the shop, about what I was experiencing w/ my BMW. He was aware that there was a problem w/ , as he said, "electric throttle hesitation". The next few softwares had been released, and addressed this hesitation, but Joe shared that some of the memos w/ me. A memo f/ BMW in Sept 08, talked about the issue. But there were bugs in these softwares, that had electronic issues, etc. So Joe suggested I wait for a version that didn't have these bug, but addressed the hesitation issue.

This bring us up to date. Yesterday, 6 Nov 2008, my car went in for service, and was re flashed w/ V31.1.0. (a copy of the tech sheet was give to me, to confirm this). My passed performance issues were, hesitation, or turbo lag f/ a stop, or low RPM, take offs. Well, my spirited drive home, yesterday was about as hard as I could make it for the new V31.1.0. All combinations of acceleration that I could think of were put to the test. While I am not a mechanic, I can change my oil, spark plugs, brakes, etc. My understanding of the dynamics of the 2 small turbos spooling up on my BMW are not technical, but I know what I feel thru the gas pedal, brake pedal, and steering wheel. I am however a certified EVOC instructor thru the state of MD. I can post lap times w/ the best of them on a road course, and have been at the top of the charts against other EVOC instructors. Enough said.

Well I'm pleased to say... THE TURBO LAG/ ELECTRINIC THROTTLE HESITATION IS GONE! My 1 year old BMW is back the way its was when it was new, w/ no electronic bugs f/ BMW either.

To those of you who had questions on my previous posts, ie, how do I know what software I have, and how do I know if I have turbo lag. I am only aware of the dealer being connected to their CPU, and telling you what version software you have. As to turbo lag, only the driver knows what they feel thru the seat of their pants. The current BMW software is only available as a download f/ BMW in NJ. The shop doesn't have it on disc yet. So it takes about 4 hr. to install. WARNING, the dealer will only upgrade your BMW if you have some type of software issue that either gives error codes or causing a recognizable symptom on your car. If they run a diagnostic on your car, and nothing is wrong they will tell you your BMW is preforming as it is programed to do. Hence you go home w/ no software upgrade. That did happen to me last month. BMW is still not openly admitting to have a programed turbo lag. I recommend telling your SA the the car sometimes HESITATES f/ a stopped start, ie. stop sign, or red light.

Good Luck, dave in Bel Air

Hopefully there's something to this.

-B

[imoksoami]

Originally Posted by Christos

Couple questions. I have a 10/2007 E92 with AT. I don’t think I have lag, but as stated many times, by many, the torque pull is not really present until around 3000 rpms at least.

Questions:

1. If I am in 4th gear and turning a corner with rpm’s around 2200, shouldn’t I technically have max torque 300 ft/lbs and have tons of pull through? I don’t by the way and the car seems sluggish, until 3000 rpms

??

Absolutley. This was the biggest selling point of this car.

[masku]

Originally Posted by Christos

Couple questions. I have a 10/2007 E92 with AT. I don’t think I have lag, but as stated many times, by many, the torque pull is not really present until around 3000 rpms at least.

Questions:

1. If I am in 4th gear and turning a corner with rpm’s around 2200, shouldn’t I technically have max torque 300 ft/lbs and have tons of pull through? I don’t by the way and the car seems sluggish, until 3000 rpms

At 2200 RPM in 4th, you should have 300 ft-lb of torque at the engine. But I don't think you will have "Max Pull".

You feel "Max Pull" when you get max torque at the wheels, and this is not the same as the torque generated by the engine.

The gear ratios for 335i:
1st: 4.06
2nd: 2.40
3rd: 1.58
4th: 1.19
5th: 1.0
6th: 0.87

When the engine generates 300 ft-lb torque, this is the torque that you would get at the wheels:
1st: 4.06 * 300 = 1,218 ft-lb
2nd: 2.40 * 300 = 720 ft-lb
3rd: 1.58 * 300 = 474 ft-lb
4th: 1.19 * 300 = 357 ft-lb

So you are getting only 357 ft-lbs of torque at the wheels in 4th. You will experience much more "Pull" in lower gears.

[BzzzBom]

I have a pre v29.2 2007 335i and my lease expires in a few months. I am thrilled to hear that the old 335i performance is back and am looking forward to a 2009. Apparently some of the early 2009 cars still had the turbo lag.

[tyler9595]

Originally Posted by BzzzBom

I have a pre v29.2 2007 335i and my lease expires in a few months. I am thrilled to hear that the old 335i performance is back and am looking forward to a 2009. Apparently some of the early 2009 cars still had the turbo lag.

Wha? My lease is up this month. I drove a 2009 e90 335 on Wednesday. Read my review a couple of pages back on this thread. Based on my test drive, my sense is that the "old 335i performance" is definately not back.

Like you, I have really been looking forward to a 2009. So, I'm very curious what makes you think the problem is resolved?

[RBBMWE46M3]

+1

[BMWagain]

Marconi where are your pictures of the fix?

[paltomare]

Originally Posted by BMWagain

Marconi where are your pictures of the fix?

Yes, please post pics.

[ezatnova]

Originally Posted by RBBMWE46M3

...Sorry friend, not my question

My bad, it was Quisps.

[marconi118]

Here the picture of the mod

[marconi118]

to see full size go to http://img129.imageshack.us/my.php?i...img4515vl6.jpg

[Christos]

Originally Posted by marconi118

to see full size go to http://img129.imageshack.us/my.php?i...img4515vl6.jpg

What are we looking at and what is this mod?