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BMW 5-Series (G30) Forum 2017+ BMW 5 Series (G30) General Discussions 2021 M550i - Underperforming

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      03-27-2021, 11:34 AM   #89
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Quote:
Originally Posted by jmhildreth View Post
You know, every car tested by the automotive press has had DHP. That's got to add weight. C&D's car was over 200 lb heavier than the standard quoted weight for an M550i. That's probably not enough to make a 0.5 sec from weight alone but who knows what other effect it might have? A retest with a non-DHP car might be interesting.
My car is non-DHP. Same results.
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      03-27-2021, 12:29 PM   #90
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Recently I started realizing on stock RF 19s car bogs down after LC, It's barely noticeable but I can feel it. Traction control doesn't light up on the dash, hits 2nd gear and rolls harder but after 3rd it pulls like a different car.
I got better results with DSC fully off and brake boosting to 2.8k, launching off brake. (Can't sit on it for top long, it bogs down) hit 2.8k n go.
Car is definitely boost by gear. Even my HP max shows it launching around 560-580hp, after 3rd gear it maxes out 640hp chart.
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      03-27-2021, 02:57 PM   #91
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DHP car here. My experience is consistent with everyone else’s. Car is being held back by ECU
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      03-27-2021, 08:57 PM   #92
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The launch control thing has been discussed a good bit on forums and specifically the M5 board recently. It's something across models and not specific to the 5 series. Launch control will never go away but eventually (apparently after 100 launches) the quick shift pattern it uses will cease. I think that effectively maps well to the "reduced intensity" note.
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      03-27-2021, 09:20 PM   #93
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Quote:
Originally Posted by crypto View Post
The launch control thing has been discussed a good bit on forums and specifically the M5 board recently. It's something across models and not specific to the 5 series. Launch control will never go away but eventually (apparently after 100 launches) the quick shift pattern it uses will cease. I think that effectively maps well to the "reduced intensity" note.
Oh. So it's possible it will go away?
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      03-28-2021, 07:31 AM   #94
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Quote:
Originally Posted by crypto View Post
The launch control thing has been discussed a good bit on forums and specifically the M5 board recently. It's something across models and not specific to the 5 series. Launch control will never go away but eventually (apparently after 100 launches) the quick shift pattern it uses will cease. I think that effectively maps well to the "reduced intensity" note.
Oh. So it's possible it will go away?
Definitely sounds like the updated ECU software in either the DME or the 8HP is to blame here.

There's no way this thing shouldn't achieve sub 4 even in all seasons. And interesting C+D had the same experience.

I'd defo get a dyno run in, and get them to do the low gears as well.

The good news is if it is a software issue, it's easily fixable with an updated istep. As you've just had the head unit replaced, I would imagine you are on 21/03, so it's going to July at the earliest realistically for a fix
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      03-28-2021, 07:35 AM   #95
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The 120 trap speed in the C&D test indicates its putting out the horsepower once it gets rolling. Something is holding it back at the launch.
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      03-28-2021, 01:45 PM   #96
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Likely pulling timing or limiting boost down low from launch. Most likely ecu software issue. This car rips when you floor it from a roll. Sucks that the dme is locked right now as I bet a tune would easily work out the issues. I will be following this thread. I only have 1,600 miles on my 2021 550, but I got a dragy and I am on performance tires in texas. So, I'll have to find a road by my house and try launch control soon.
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      03-28-2021, 01:49 PM   #97
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Quote:
Originally Posted by Texox View Post
Likely pulling timing or limiting boost down low from launch. Most likely ecu software issue. This car rips when you floor it from a roll. Sucks that the dme is locked right now as I bet a tune would easily work out the issues. I will be following this thread. I only have 1,600 miles on my 2021 550, but I got a dragy and I am on performance tires in texas. So, I'll have to find a road by my house and try launch control soon.
I’ve owned a lot of fast cars, one quite a bit faster than the 550. The reality is that it’s very rare I want it go wide open from a dead stop. But I get that y’all want what it’s supposed to have.
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      03-28-2021, 02:51 PM   #98
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Quote:
Originally Posted by Texox View Post
Likely pulling timing or limiting boost down low from launch. Most likely ecu software issue. This car rips when you floor it from a roll. Sucks that the dme is locked right now as I bet a tune would easily work out the issues. I will be following this thread. I only have 1,600 miles on my 2021 550, but I got a dragy and I am on performance tires in texas. So, I'll have to find a road by my house and try launch control soon.
I’ve owned a lot of fast cars, one quite a bit faster than the 550. The reality is that it’s very rare I want it go wide open from a dead stop. But I get that y’all want what it’s supposed to have.
I previously had a heads/cammed c6 putting down 500rwhp and 1,000 pounds less than the m550, and the only time I was launching was at the track, which was rare. So, it's not as important to me; but I certainly agree with you and the OP as you want what you thought you were getting when you bought the car.
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      03-28-2021, 05:34 PM   #99
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I'll add a test from our local Motor Magazine in Australia.

They test 2 up with a full tank, but the launch gremlin bites them as well.
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      03-28-2021, 05:43 PM   #100
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That choppedfish run on the dragy board is me doing a quick 2k brake boost.

Slope wasn't great.

Mines a 2020 non-DHP.

I'm keen to do an LC launch.
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      03-28-2021, 05:49 PM   #101
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Originally Posted by Texox View Post
...This car rips when you floor it from a roll...
This 100% - as long as you are even crawling just a smidge, the butt dyno detects no reduction in boost at all - its an absolute rocket.
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      03-28-2021, 05:54 PM   #102
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This 100% - as long as you are even crawling just a smidge, the butt dyno detects no reduction in boost at all - its an absolute rocket.
Even in eco pro mode it's fast. I did some hits at 70mph to 100mph and even whatever gear (6/7) its impressive.
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      03-28-2021, 08:07 PM   #103
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The weird thing is that carwow did a 3.8. Still not the actually time, but faster than what you guys are getting.
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      03-29-2021, 10:51 AM   #104
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So how accurate is that little thingy that people use here? After reading this article I have some concerns regarding run times.

Do inexpensive performance meters work?/
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      03-29-2021, 01:08 PM   #105
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Quote:
Originally Posted by Texox View Post
Likely pulling timing or limiting boost down low from launch. Most likely ecu software issue. This car rips when you floor it from a roll. Sucks that the dme is locked right now as I bet a tune would easily work out the issues. I will be following this thread. I only have 1,600 miles on my 2021 550, but I got a dragy and I am on performance tires in texas. So, I'll have to find a road by my house and try launch control soon.
Looking forward to see your numbers when launching. Try to film the sport display at the same time to see turbo pressure and how much power and torque is delivered in the different gears. Since you have performance tires I guess traction should not be an issue as long as the road is dry.
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      03-29-2021, 04:51 PM   #106
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Quote:
Originally Posted by remo999 View Post
So how accurate is that little thingy that people use here? After reading this article I have some concerns regarding run times.

Do inexpensive performance meters work?/
Not to be combative, but we're going to base questioning modern GPS / Satellite based performance tracking (that this entire forum across all models uses as a general and accepted benchmark) based on an article from 2005?

I have been curious about thinks like the newer race box that looked like a knockoff VBox system. But based on reviews and how basically everyone uses a Dragy, I ended up putting my $100 there.
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      03-29-2021, 05:22 PM   #107
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Quote:
Originally Posted by hoyas490 View Post
Not to be combative, but we're going to base questioning modern GPS / Satellite based performance tracking (that this entire forum across all models uses as a general and accepted benchmark) based on an article from 2005?

I have been curious about thinks like the newer race box that looked like a knockoff VBox system. But based on reviews and how basically everyone uses a Dragy, I ended up putting my $100 there.
Dragy is pretty accurate.

https://dsportmag.com/the-tech/educa...t%20of%20error.
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      03-29-2021, 09:05 PM   #108
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Quote:
Originally Posted by remo999 View Post
So how accurate is that little thingy that people use here? After reading this article I have some concerns regarding run times.

Do inexpensive performance meters work?/
Quote:
Originally Posted by remo999 View Post
So how accurate is that little thingy that people use here? After reading this article I have some concerns regarding run times.

Do inexpensive performance meters work?/
Well to put things in perspective for you.

Dodge advertises Challenger Scat pack as 4.2 secs 0 to 60.
Using dragy i clocked it at 4.2s. (The built in timer showed the same, best time was 3.8 secs at the drag strip.)

My friends S8 Plus is advertised as 3.3s, I clocked it using Dragy at 3.4s. (The best time was 3.2 secs!)

Now for my M550 its advertised as 3.6s, I clocked it at 4.2 secs and the best at 4.1 secs.


I'd say dragy is pretty damn accurate!
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      03-29-2021, 10:03 PM   #109
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Quote:
Originally Posted by DB_BMW View Post
Well to put things in perspective for you.

Dodge advertises Challenger Scat pack as 4.2 secs 0 to 60.
Using dragy i clocked it at 4.2s. (The built in timer showed the same, best time was 3.8 secs at the drag strip.)

My friends S8 Plus is advertised as 3.3s, I clocked it using Dragy at 3.4s. (The best time was 3.2 secs!)

Now for my M550 its advertised as 3.6s, I clocked it at 4.2 secs and the best at 4.1 secs.


I'd say dragy is pretty damn accurate!
Hmm, so it's official - N63B44T3 version installed in 20/21 M550 has either software bug or some kind of minor hardware issue that momentarily reduces power. What's confusing is that the same engine is installed in V8 versions
of X5/X6/X7/850 and none have issues. I'm at loss, seriously. Good luck to owners - I would be very pissed if my 18 M550 was doing 0-60 in 4.5s.
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      03-30-2021, 04:06 AM   #110
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My car has 1600miles on it and for the life of me could not get launch control on it tonight, for the first time. DSC Off, sports +, gear lever in manual/sports, mash the brake and then the throttle to floor. Revs climb to 3k and no launch control appears. I tried multiple times and even DTC off with no luck. Ieven did a dragy run on brake boost fine, just not able to engage launch control. I wonder if 2k miles is the trigger though the other thread says combined wisdom indicates that there is no run in period before it activates.

Very odd.
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