Quote:
Originally Posted by mineo77
My software update report:
- Noticable turbo lag in mid rpm range 2-4K
- poor MPG's
- overall sluggish feeling
- radio station info
- louder whirring sound when i open my doors
overall, I am largely disappointed in the update. I f'n HATE turbo lag, and that was probably the biggest selling point to me...now it feels like i am driving a Jetta 1.8T with more horsepower. Not to mention I do the same drive every day to work and have notice 2-4 mpg worse now....could be that i keep trying to initiate boost. My boost gauge use to show a bit overshoot reaching 8-9 psi stock, but havent seen that happen since upgrade(downgrade) and lot longer to initiate boost.
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UPDATE:
Well, as anyone could have guessed, the official response from BMW service, "road tested and found no problems."
Of course there isn't an obvious problem. But, the 'problem' is that performance is NOT what it used to be. That is the problem.
However, as one of the tech's said, they can only test the car to see if it's running, meaning it accelerates and rpms go up and down.
They don't have any information as to what the software actually does or did differently. They just hook it up and the diagnostic says it's all just fine.
I told the tech that I understand there is no obvious or apparent running problem like a misfire or stuttering idle. The issue is that overall performance has been affected in a negative way, and I want them to note this and report it to BMW. Putting "no problem found", doesn't give the correct feedback to BMW as to what the customer is complaining about.
I suggest that any of us who get the new software, make sure you fill out the survey and clearly state that there IS a problem and the problem is that performance is less than before, and that is NOT what we paid for.
I'm going to call BMWNA and at least have them do a report that the issue that I took my car in for has NOT been fixed nor properly addressed.
We have one poster here, mineo, who has direct proof that performance has been lessened. He has seen that boost is less than before.
Before, he was getting 7-8psi consistently with 9psi peaks at times.
Now, he doesn't even get 7psi, but more like 6psi.
That is a 20% boost loss, and that directly affects overall performance, negatively.
I don't feel that power is more linear and with more lag. Those 2 things don't jibe. More lag means less linear power delivery, and it shows itself more so with a manual trans than an automatic, as the auto trans can slip between gears keeping engine speed higher with less boost loss between shifts.
I think they leaned out the A/F, possibly, to lessen demand and load on the HPFP. MPG might increase slightly, but overall engine operating temp can be higher, as it is in mine. Leaner burn results in greater heat.
My oil temp is now running between 10-20F degrees hotter in same driving and atmospheric conditions.
Typically if you lean out the mix you can increase performance as combustion can be more complete, but only if you address the overall tuning. This software however seems to lower boost as well thus negating any power benefits from a leaner burn.
I had an odd idle where my base idle is around 625rpm, but with the new software idle would go as high as 800rpm and stay there.
However, I think the idle issue was a result of my AC problem. I had very little coolant in the system. I was using my AC during the same time they put in the new software. I think what was happening is that while the AC was on the low coolant level wouldn't let the compressor turn on. But, by leaving the AC on while driving, pressure in the system would rise and cycle the compressor on and then quickly off, and then keep repeating this pattern resulting in getting odd idle.
I came by this simply because now with the AC system filled, my idle has settled back to 625rpm with the AC off, and it goes up to about 650-675rpm when I turn the AC on, and it holds steady.
I do notice, however, that some of you are also stating that your idle is up and down. Those of you that have an erratic idle, does you AC work?
There is a TSB on a no AC condition, so maybe some cars have no AC, and maybe it's causing this odd idle condition if you have the HVAC set to "auto" where it might be calling for AC.
Just a thought.