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2019+ BMW 3 AND 4-SERIES FORUMS (G2x Generation) General G20 Sedan / G22 Coupe / G26 Gran Coupe Discussions Frustrated, G20 M340 - 0 to 60mph in 4.9s - what did i do wrong?

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      03-19-2022, 01:13 AM   #1
kamaleon_m340
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Unhappy Frustrated, G20 M340 - 0 to 60mph in 4.9s - what did i do wrong?

Hi guys,

I own a BMW M340 G20 2021, couple of days ago I tried my firsts launch control and I did 0 to 60mph: 5.4s, 4.98 and 4.91s... I'm really sad because I got those numbers, maybe I did something wrong and that's the reason why I'm posting here, I will test all the advices in order to see if I really improve the times. I will put the next info that could help to identify what is the problem (80% I'm the problem but well ) also, i'll attach my launch control.

1. I did launch control holding the car for 2 seconds then I launched the car
2. I have runflat tires
3. I'm in Bogota altitude 2640msnm, temperature 19°C
4. I have K&N filter
5. I have downpipe VRSF
6. No stage, any repro because of warranty
7. floor was dry, no dust, no sand
8. I tried gas with 98 octanes (that's called Primax G-Prix here in Colombia)

Launch control: https://www.youtube.com/watch?v=lFB2NLEVx0k

as I already said, any advice will be welcomed, thanks
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      03-19-2022, 07:31 AM   #2
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check the incline of the road, if you were on a slight uphill it will kill the times like that, and the high altitude will definitely drop the power output so that may be what's going on too
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      03-19-2022, 08:03 AM   #3
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Surely the run-flats are not helping either!
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      03-19-2022, 11:29 AM   #4
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Elevation plays a big part along with the tires .
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      03-19-2022, 04:23 PM   #5
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internet says lose 3% of hp for every 1000ft
2.6km is over 8000 ft

which means you have lost a lot of horses with the low oxygen in the air (same concentration but lower partial pressure)
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      03-19-2022, 04:46 PM   #6
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Quote:
Originally Posted by G80M4 View Post
internet says lose 3% of hp for every 1000ft
2.6km is over 8000 ft

which means you have lost a lot of horses with the low oxygen in the air (same concentration but lower partial pressure)
Don't turbos boost more in higher elevations?
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      03-19-2022, 06:43 PM   #7
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hmm .. not sure sorry ...
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      03-20-2022, 12:10 PM   #8
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xdrive or rwd? (video looks like xDrive)

I have the "worst" M340i setup for 0-60 (RWD, 225 rear, All-Season Pirelli), and I can still knock out a 4.5 0-60 in Sport+, Sport Shifting, and DSC on.

Bear in mind, I'm at sea level, so air pressure is perfect here.


More than likely, it's your elevation that's the issue. Based on that video, your car seems to be running absolutely fine. The engine/turbos are probably air starved, though.
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      03-20-2022, 12:46 PM   #9
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It’s the altitude. At, 2438m, (8000ft) Bogota is at an extremely high altitude. That’s the actual height of a city of 7.2 million. The highest, drivable road in Europe 2522 meters. The actual peak is 3380m but the road is 2522m. Turbos and superchargers help to a certain point. To maintain the factory given hp/tq at that altitude, you’ll need bigger turbo(s) AND a tune! And that’s just to match the factory specs.
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      03-20-2022, 12:49 PM   #10
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Quote:
Originally Posted by J1960 View Post
It’s the altitude. At, 2438m, (8000ft) Bogota is at an extremely high altitude. That’s the actual height of a city of 7.2 million. The highest, drivable road in Europe 2522 meters. The actual peak is 3380m but the road is 2522m. Turbos and superchargers help to a certain point. To maintain the factory given hp/tq at that altitude, you’ll need bigger turbo(s) AND a tune! And that’s just to match the factory specs.
yep, only so much turbos can do with air that thin
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      03-20-2022, 02:03 PM   #11
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Quote:
Originally Posted by G80M4 View Post
internet says lose 3% of hp for every 1000ft
2.6km is over 8000 ft

which means you have lost a lot of horses with the low oxygen in the air (same concentration but lower partial pressure)
Based on this exactly he's ferritin about 304 hp if we say stock the car is 400. So seems like elevation is the culprit even if the ecu is adapting it's still just less combustion possible.
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      03-21-2022, 12:31 PM   #12
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Quote:
Originally Posted by G80M4 View Post
internet says lose 3% of hp for every 1000ft
2.6km is over 8000 ft

which means you have lost a lot of horses with the low oxygen in the air (same concentration but lower partial pressure)
This is true of naturally aspirated motors. However the m340i is a turbocharged motors. Turbos actually work more efficiently in lower air density, to the point you may even see a slight INCREASE in power output at the higher altitude.

Something else is going on. I'd visit the dealer to see if there's some issues with drivetrain.
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      03-21-2022, 12:32 PM   #13
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Quote:
Originally Posted by Blubaron79 View Post
Don't turbos boost more in higher elevations?
Yup. I suspect there's some other issue going on. Generally speaking turbos work more efficiently at higher altitudes and you may even see small increases in power output.
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      03-21-2022, 02:01 PM   #14
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Quote:
Originally Posted by wtwo3 View Post
Quote:
Originally Posted by Blubaron79 View Post
Don't turbos boost more in higher elevations?
Yup. I suspect there's some other issue going on. Generally speaking turbos work more efficiently at higher altitudes and you may even see small increases in power output.
That's interesting I didn't know that I'd think less air to suck in would cause slower cars? Also I remember some guys in Denver testing the Redsport Q50 and said because of the altitude they are going to have worse track times . The RS is a twin turbo.
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      03-21-2022, 02:55 PM   #15
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Quote:
Originally Posted by TruthOne View Post
That's interesting I didn't know that I'd think less air to suck in would cause slower cars? Also I remember some guys in Denver testing the Redsport Q50 and said because of the altitude they are going to have worse track times . The RS is a twin turbo.
Yeah I'm not sure if they were mistaken. But with turbocharging you typically won't lose power at altitude, and depending on the type of turbocharging taking place, might even gain a small amount of power.

I'm totally willing to admit if I'm wrong but that's what I've always read and heard when it comes to turbocharged motors.
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      03-21-2022, 05:49 PM   #16
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Turbo cars are more efficent than NA cars at higher altitude. That is true.

But less air is less air, Turbo cars can compensate to certain point. At the end of the day, Turbos are not trees, they do not produce Oxgen... But it is MUCH MUCH better than NA cars.

Everything that requires oxgen loses its performance at higher attitude, it is just a difference of how much you lose and how high you go.

OP should just take a trip to sea level and test again. 8000 feet is pretty damn high already. Denver is only about 5000 above sea level... another 3k.... i can only imagine.

I would consider any car that can do 0-60 in 4.9 secs in 8k+ altitude pretty damn fast.

Last edited by oonowindoo; 03-21-2022 at 05:57 PM..
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      03-21-2022, 06:39 PM   #17
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Quote:
Originally Posted by wtwo3 View Post
This is true of naturally aspirated motors. However the m340i is a turbocharged motors. Turbos actually work more efficiently in lower air density, to the point you may even see a slight INCREASE in power output at the higher altitude.
are you sure about that?

i think there is nothing wrong with his car
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      03-21-2022, 06:42 PM   #18
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I dont know how less air can produce MORE power than at sea level... If that is the case, we got how Force Induction works all wrong.

That is like saying i can run faster and longer at 8K+ altitude than at sea level....
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      03-21-2022, 07:51 PM   #19
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Quote:
Originally Posted by oonowindoo View Post
I dont know how less air can produce MORE power than at sea level... If that is the case, we got how Force Induction works all wrong.

That is like saying i can run faster and longer at 8K+ altitude than at sea level....
https://www.garrettmotion.com/news/n...%20sea%20level.


Quote:
Turbocharging at elevation is an efficient way to minimize horsepower loss due to elevation and lower air density. At high elevations turbochargers compress more air into the engine cylinders making up for the lower air density allowing the engine to produce power as if it was at sea level. This extra tunability is found only in turbocharged applications.

https://www.google.com/amp/s/www.mot...ormance/%3famp

Quote:
While naturally aspirated cars do lose power as the elevation increases, the same cannot be said for turbocharged cars. According to Garrett, using a turbocharger is an efficient way of minimizing your car’s power loss at a high elevation because turbochargers compress more air into the engine’s cylinders, which in turn makes up for the lower air density.

The Pike’s Peak Hill Climb, which is an annual race in which the cars start 9,000 feet of elevation and climb their way up the 12.42-mile course up to 14,115 feet, is a great example. As you can imagine, most, if not all of the cars use turbochargers to provide ample power from start to finish as they are all tuned to create the same type of power as the elevation increases.

We actually experienced this first hand when driving the 2020 Honda Civic Type R up Pike’s Peak on a leisurely weekend. As we snaked our way up the hill, we didn’t notice any power drop at all when hammering on the throttle in the straightaways. It was an amazing phenomenon to experience, as driving a 300 horsepower all way up to the top was just as easy as driving to the grocery store down the street
.
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      03-21-2022, 07:52 PM   #20
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Quote:
Originally Posted by G80M4 View Post
are you sure about that?

i think there is nothing wrong with his car
See above ^
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      03-21-2022, 07:58 PM   #21
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Quote:
Originally Posted by wtwo3 View Post
See above ^
Did you read it? That's not what that says at all...

The altitude is a likely culprit for the issue with the OP, but we can't be sure without ruling out other variables with further testing.
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      03-21-2022, 08:09 PM   #22
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Quote:
Originally Posted by siegester View Post
Did you read it? That's not what that says at all...

The altitude is a likely culprit for the issue with the OP, but we can't be sure without ruling out other variables with further testing.
What does it say? The last paragraph says they didn't experience any power loss driving a civic type r up pikes peak. Why not?
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