08-12-2015, 05:59 AM | #45 |
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I have the non-extended cluster and I can confirm the checkered flag will light up.
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08-16-2015, 12:14 AM | #46 | |
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Better than LC says test driver
Quote:
http://www.edmunds.com/bmw/2-series/...st-specs1.html
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08-16-2015, 03:43 PM | #47 | |
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Quote:
Looks this video here is with not extenden cluster like my M235I
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09-22-2015, 11:28 AM | #48 |
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There must be more to getting LC to work than having the engine warm and following the LC steps. This past weekend at our local BMWCCA chapter autocross we had a course that looked perfect for using LC. Straight ahead launch for over 100 feet into a slalom. Concrete surface. I was on Dunlop Direzza II Star Spec tires (not the stickiest but better than the OEM PSS tires). Tried LC on my first two runs and both times the revs went up past 3000, no checkered flag on the dash, and rear tires started spinning. Engine temp was at about 225 degrees (P3 Cars vent gauge). Perhaps the transmission needs to be warmed up too and that is why the manual calls for the car to be driven 6 mile.
After a 90 minute drive to the event site, the car sat for over 2 hours before going to grid. When we finally got started the car sat idling for about 15 minutes before my first run so the engine temp was good. After my first run the car idled for about 20 minutes before the second run so the engine stayed up to temp. My conclusion is that LC is pretty much useless for autocross, and probably useless for (sanctioned) drag racing unless you can get enough runs to get the transmission hot. Probably most useful for street racing or just showing off on the street. |
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09-22-2015, 12:11 PM | #49 |
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I've found that I get better times without the LC, but then again I have a cab and it's heavier...might help with the grip.
It is a pain, but I've found that mashing the throttle doesn't work as well as slowly putting the throttle to the floor and clicking the kick-down button. |
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09-22-2015, 04:16 PM | #51 |
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One of the posts above mentioned needing to have the tyres warm. Spot on, if you toodle around for 10km / 6miles warming engine and tranny your tyes will not be warm.
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09-22-2015, 04:52 PM | #52 |
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I was in Sport + and gear selector was in S1. At a previous event I tried it with the DTC button push like in the video and it didn't work then either. At that event on my sixth run it did work, sort of. Then I wasn't trying to use LC but was in Sport+ S1 and holding the revs at the point where the engine was just about to overpower the brakes. When I got the green flag my right foot went down faster than my left foot lifted and the checker flag icon came on for a split second, as I launched with only a slight chirp from the rear tires.
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09-22-2015, 05:55 PM | #53 |
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With all this uncertainty on how to use launch control, plus the controversy about whether LC actually improves acceleration times, I say, why use it? I've never used LC, plus I do not want to put all that stress on the drive train, particularly for little or no gain.
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01-04-2018, 03:13 PM | #56 |
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01-05-2018, 07:13 AM | #57 | |
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Selecting shift points rather than going to red line in launch control
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01-05-2018, 11:55 AM | #58 | |
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Quote:
https://youtu.be/zZBqb0ZJSwU. This guy does a pretty good job of explaining the technical aspect. Real world may be a little different depending on traction availability and what speed you are accelerating to. I think someone mentioned that launching in 2nd gave them the best 0-60. (no lc) |
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01-05-2018, 08:50 PM | #59 | |
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Wonder if anyone has done any empirical testing to find the optimal shift points generally speaking and the best gear to launch in (aside from using LC). |
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01-05-2018, 09:00 PM | #60 | |
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01-12-2018, 02:20 AM | #61 |
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on launch control for the 6MT, there is threads about that the revs will hold at approx 3.5k.
yes all true and ive tried in all modes and works. but having read some other stuff and looked with bimmercode to code launch control on my 6MT, it isn't actually launch control. 1. no launch control option on the ECUs for the 6MT with my bimmercode. 2. revs hold to protect the engine so you dont over rev - not launch control
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