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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications M340i xdrive drag strip testing, bone stock.

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      10-05-2019, 10:52 AM   #1
ls3c6
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M340i xdrive drag strip testing, bone stock.

Went 12.08 on stock all season 19s at 36psi cold, zero modifications, full weight. Very nice.
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      10-05-2019, 11:23 AM   #2
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Very impressive for stock and with even a slight tune it'll be in the 11s.

For comparison my F30 340xi did around 12.65 @ 108.8mph stock.

Were you on 93 octane?
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      10-05-2019, 11:30 AM   #3
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Yea 93 from Sam's, did nothing but drive there, seeing 11psi on sport gauges.

It feels quicker than my jb4 f30 did
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      10-05-2019, 02:00 PM   #4
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Quote:
Originally Posted by ls3c6 View Post
Went 12.08 on stock all season 19s at 36psi cold, zero modifications, full weight. Very nice.
Very impressive! If you don't mind me asking....is your car a very early build? Or, is it fairly new. Even if it's an early build, did you have the dealership do any software updates over the past few months? The updates are supposedly robbing the cars of 50+ hp, and unless you have a real early build with no updates, that makes your time/trap even more impressive.
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      10-05-2019, 04:00 PM   #5
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Quote:
Originally Posted by The Nerd View Post
Very impressive! If you don't mind me asking....is your car a very early build? Or, is it fairly new. Even if it's an early build, did you have the dealership do any software updates over the past few months? The updates are supposedly robbing the cars of 50+ hp, and unless you have a real early build with no updates, that makes your time/trap even more impressive.
I picked it up mid sept I believe all those recalls were done already
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      10-06-2019, 06:01 PM   #6
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Nice job! Did you use launch control?

A lot of people will be in the 11's with good conditions. That 60ft time looks like it could be better too. These cars are really quick. I just picked up an M5 yesterday and can say in normal driving the M340 is quicker. If you hammer it at 40mph it gets to 60mph faster than the M5 (draggy verified). After that the M5 pulls way harder though.
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      10-06-2019, 08:10 PM   #7
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60'd best in sport plus dsc off, foot brake, lc was more like 1.85... I cant make it 60 well, may be the programming or limitations of the stock converter.
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      10-07-2019, 09:35 PM   #8
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Do you have adaptive dampers?

Just wondering if launching in “comfort” would be best... get better traction off the line.
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      10-07-2019, 10:18 PM   #9
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Do you have adaptive dampers?

Just wondering if launching in “comfort” would be best... get better traction off the line.
I do and I tried dampers in both modes, it just doesn't attempt to launch hard maybe I held the brake too long staging etc... not sure I'll try some more.
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      10-09-2019, 10:26 PM   #10
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Quote:
Originally Posted by The Nerd View Post
Very impressive! If you don't mind me asking....is your car a very early build? Or, is it fairly new. Even if it's an early build, did you have the dealership do any software updates over the past few months? The updates are supposedly robbing the cars of 50+ hp, and unless you have a real early build with no updates, that makes your time/trap even more impressive.
I still think this whole detune thing is BS.
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      10-10-2019, 06:54 PM   #11
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Looks like it man, if his is that good and was picked up last month. I am fine with stock either way lol.
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      10-10-2019, 11:26 PM   #12
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I still think this whole detune thing is BS.
I’m not convinced it’s BS, but I would argue people ignore how much transmission gearing and torque output can impact acceleration. I think both of these are a bigger factor than given credit for. A lot of the time, when I want to drive somewhat aggressively, I stick to the midrange because I don’t see a huge difference compared to full throttle peak horsepower.

Anyone tested the RWD yet? There’s a ~150lbs weight advantage so could see higher trap speeds?
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      10-11-2019, 01:34 PM   #13
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Mine is RWD, perhaps in the future I can test it when I get non run flats.
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      10-11-2019, 05:00 PM   #14
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Quote:
Originally Posted by Giggler View Post
I’m not convinced it’s BS, but I would argue people ignore how much transmission gearing and torque output can impact acceleration. I think both of these are a bigger factor than given credit for. A lot of the time, when I want to drive somewhat aggressively, I stick to the midrange because I don’t see a huge difference compared to full throttle peak horsepower.

Anyone tested the RWD yet? There’s a ~150lbs weight advantage so could see higher trap speeds?
I did mine with a dragy. Trapped at 114.5 mph. Couldn't hook up off the line. Someone needs to run the i at an actual track. I have a feeling it'll be high 11's. I'd take mine if I could but the nearest track is almost 2 hours away with traffic.
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      Yesterday, 10:54 AM   #15
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That is impressive for stock! I want to see RWD times
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