05-07-2023, 08:41 AM | #1 |
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Stock f30 340i 0-100km 5.47s(0-60m 5.3s) looks right?
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I just did a couple of test runs on my f30 340i(2016), all stock options. Without launch control. on a normal highway, clear and dry condition. Tire is not new, but in good condition. tested with both Sports/Sports+, The best shot I got is just 5.47s for 0-100km/h. (5.3s/0-60) btw, I am using Torque pro/ODB Bluetooth for the tests. Is that normal? How can I be closer to the official claimed 4.6s? 5.4s to 4.6s sounds like a huge gap, wondering what could be the reasons? Anything I can do to improve it? (still with stock options) |
05-07-2023, 11:02 AM | #2 |
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Ok, a couple of things here:
1. From what it sounds, you are not even measuring accurately enough. You need a Dragy or P-Gear for a measurement which is accurate enough to compare to others or to official figures! Anything else is just a random guess! Trust me - I had my hopes on BMW's own Laptimer app, which uses car live data, but even that turned out to be far from the truth. 2. The above aside, 5,47 does sound a bit slow. But again - your figure is rather a guess, not a measurement. 3. Why not use Launch Control....!? That's its sole purpose.... 4. Don't know where you read 4,6 as an official 0-100 figure, but that's quite incorrect. Without xDrive and MPPSK, the official figure for your vehicle is 5,1 s. 0-100. 5. Even with MPPSK, without xDrive you will struggle to keep it consistently under 5. So realistically and with the right equipment you should be able to do around 5-5,2 with LC. The time depends heavily on your car equipment configuration as well (sunroof, tow bar, etc., etc.). If your car is rather basic, you may beat the official figure.
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05-08-2023, 05:24 AM | #3 | |
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It does make sense in this case if considering the measure deviation and the offical is 5s but 4.6s. I never ran with launch control, so make sense. |
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05-08-2023, 08:37 AM | #4 |
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.... Therefore if you really want to know - buy a dragy / p-gear and measure again, preferably with LC. Some people achieve better results without LC, using other techniques, but to compare to official figures - I'd recommend starting off with LC and letting it do its thing.
You should be able to do 5-5,2 s depending on your configuration and environment.
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05-10-2023, 04:33 AM | #5 | |
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Normally would LC be 0.1~0.2s faster than without LC if no special techs applied? |
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05-10-2023, 04:36 AM | #6 |
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That's hard to tell. Some people achieve better results without LC, it all depends on the technique. But LC is a more "defined" and safe way to lunch. I would think one gets more consistent results with LC, even if not necessarily the best results.
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05-10-2023, 05:13 AM | #7 |
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P.s. so you were not holding the brake the build-up boost when you did it!? That would explain the poor time!
Try again to trigger LC. Engine must be warm for it to work and you need to be in Sport+. Again - it may not give you the absolute best time, but it is a controlled and “calibrated” (and self-calibrating) approach, which is also safer for your car.
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05-10-2023, 12:32 PM | #8 | |
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05-10-2023, 12:38 PM | #9 | |
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Where/what are the disclaimers then? The only disclaimer is that launching your car puts it under more stress than not lunching! That's kind of a given.... But what is LC mode for, if not for a controlled launch? Launch Control limits the RPMs, monitors various parameters and adjusts in accordance. It will for example not activate if your engine is not warm enough or gearbox too hot from last launch - these are just two examples of the protective mechanisms it applies. If you are to launch your car, LC is the safest way to do it, but not necessarily the fastest, as even BMW admit in the manual. Clearly not launching it at all is even safer.
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Last edited by Skyhigh; 05-10-2023 at 12:48 PM.. |
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05-10-2023, 01:14 PM | #10 | |
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This is also discussed by XHP: "What the ZF 8-Speed Auto actually does in Launch Mode is to engage a different shift mode, which is only active when the aforementioned procedure is carried out. The characteristic of this mode can be described as "i-don't-care-about-my-clutches-mode". Yes, LC mode makes your transmission wear. " https://rbttuning.atlassian.net/wiki...LAUNCH+CONTROL I don't disagree that LC is a way to perform consistent launches. But it is 100% true that LC is a more aggressive (read - causes more wear) than other ways of launching "softer" even if these "softer" launches may sacrifice tenths of a second. As mentioned above, is not only the launch itself, its the shift mode in the trans after you launch that contributes to said wear as well, which is avoided by not engaging LC. |
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05-10-2023, 01:31 PM | #11 |
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See above - I posted the user manual! And yes - you are reading it completely wrongly!
The disclaimer tells you that if you are launching your car, you induce extra wear (shockingly! who could imagine...). Not that using LC as a mode adds extra wear in comparison to if you do an uncontrolled launch with 5000 rpm and cold engine or hot gearbox where you would get less wear just because you are not using LC!!! Read the name of the mode please and think about it - Launch CONTROL Control is key here!! What you do without it is an UNcontrolled launch! It may be less aggressive if you do it softly (but then why launch at all?), but it can be significantly more aggressive, if you do it to measure 0-100! Why would they design a mode specifically for launch otherwise and also tell you it may not give you the best results? Think about it... and its name! It is a mode designed by BMW to give you a controlled launch and still retain the factory warranty! That actually tells it all.
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05-10-2023, 01:44 PM | #12 | |
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I am not saying anything about how controlled that launch is and whether or not it achieves the best times etc. Just because BMW (and other OEMs) added the mode to the car stock doesnt mean what i mentioned above isnt true. There's a reason there are limits to using it and the dealer can check the launch count. People can choose to use it or not depending on their risk tolerance and use case for the car. I am merely presenting the information. If you want to continue believing that LC doesnt cause [more] wear than launch away. |
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05-10-2023, 02:15 PM | #13 |
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You basically insist that a controlled launch designed by the car OEM to be used by any driver, within the warranty period of the vehicle, is more harmful than a random, uncontrolled one performed by John the farmer going after 1 sec 0-100 …
I’ll let you believe that, apparently that makes sense to you…. 😉 Let’s agree to disagree. I will keep claiming the obvious and logical. At least we both agree about one thing - don’t launch at all if worried about wear. (Which is what the manual says too )
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05-10-2023, 02:54 PM | #14 | |
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We are talking about LC by definition putting the car into a mode that causes more wear than not using it when accelerating. That's it. Anything else about how someone actually accelerates or "launches" their car is speculative and depends on the specific person and conditions at the time. |
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05-10-2023, 03:03 PM | #15 | ||
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Mind the topic! It is relevant! We are not talking about driving off a red light here! We are talking exclusively about 0-100 best time! bake it, boil it, smoke it - it will always be a hard launch! A controlled hard launch is always less harmful (but not necessarily as fast) than an uncontrolled hard launch! Which is probably why the feature is called "Launch CONTROL" and is provided by BMW, within factory warranty. How is this not logical and obvious, in the context of a HARD launch, I'll never know. Back to my original claim - Launch Control is the safest way to chase best 0-100 times! Clearly I do not claim LC is safer for driving off your driveway to work than simply accelerating as a normal human being! But the thread is not about that, is it?
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Last edited by Skyhigh; 05-10-2023 at 03:08 PM.. |
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05-10-2023, 04:36 PM | #16 | |
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I suppose we just fundamentally disagree on the underlined part above since what you said about it being less harmful is inconsistent with all documentation on what LC actually does and how it affects the car during the launch and acceleration. If you truly believe this true than every single time you want to launch "HARD" you should be using LC, which i guess you do? It's called launch control because it controls the launch. It has nothing to do with controlling [read: reducing] wear. [Also not clear what HARD means. Since HARD doesn't seem to correlate to either wear or acceleration speed in your explanation.] Anyways, just providing some information on LC for OP's benefit in the context of the discussion around the 0-100km times (both from a wear perspective and now somewhat an actual acceleration speed perspective). OP and others can choose to do whatever they want. So yes, this is definitely relevant. |
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05-10-2023, 04:53 PM | #17 | |
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Ok.
Your view is noted. Agree to disagree. And if you dig a bit deeper in the documentation and statements BMW has made about LC through the years, you will realise that the mode is there for a reason. (If it ain’t fastest possible acceleration, what could it possibly be...) Quote:
I rest my case.
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05-10-2023, 06:21 PM | #18 | |
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I did warm the car, for the warming part, is it the engine oil temp is enough for indicatring a car is ready for intense driving? I think it got ~90-100 degree in about 5~10 mins drive, is that enough? then I can do LC or test runs. |
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05-10-2023, 07:43 PM | #19 | |
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This text you quoted - "Using a computer program and the innovation of an electronic accelerator, Launch Control delivers safe and optimized acceleration to drivers. It was first designed with racers in mind, but the technology has been installed in both street- and track-specification BMW cars. The system accelerates your car smoothly and quickly, without causing the drive wheels to spin. The system is also designed to take other factors into account and prevent over-revving, as well as the potential clutch and gearbox problems." - does not appear to be from BMW. It from random websites/posts and its the opinions of those people. |
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05-11-2023, 01:15 AM | #20 | |
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05-11-2023, 02:35 AM | #21 | |||
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https://polish-automotiveindustry.com/launch-control Quote:
... Quote:
But feel free to remain as stubborn as you are, despite all the facts and "opinions"
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Last edited by Skyhigh; 05-11-2023 at 02:41 AM.. |
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05-11-2023, 11:31 AM | #22 | |
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https://www.carhp.com/news/the-basic...-an-automobile https://www.bmwux.com/bmw-launch-control-guide/ Congratulations you know how to use google. Anyone who is going to rely on the information presented in these articles or the other one you cited should go ahead and read them for themselves. |
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