B**Y
发帖数: 786 | |
e*******e
发帖数: 1144 | 2 traction control is off?
【在 B**Y 的大作中提到】
: 连M4这种马力不算超大的都会直线开着开着就飞了？
: https://www.youtube.com/watch?v=miA5qj5ergM&ab_channel=DrewStorms
|
B**Y
发帖数: 786 | 3 据事主说是的。DSC就是宝马的traction control吧？
之前看youtube上飞掉的都是corvette，兰博基尼一类的超大马力车，没想到400马力的
也能飞。traction control对后驱车有这么重要？
【在 e*******e 的大作中提到】
: traction control is off?
|
z****r
发帖数: 183 | 4 是这样的。这段时间十字路口右转，一个不小心就漂了，traction control是开着的，
还是winter tire，有时甚至不用开m mode. |
L*****g
发帖数: 311 | 5 好吧，我估计DSC off，引擎声音听起来像是冷车，没有注意轮胎温度。后胎不到50度
，我是不会push hard的。如图：
【在 B**Y 的大作中提到】
: 连M4这种马力不算超大的都会直线开着开着就飞了？
: https://www.youtube.com/watch?v=miA5qj5ergM&ab_channel=DrewStorms
|
p*********e
发帖数: 32207 | 6 DSC = dynamic stability control
是bmw的ESP
DTC dynamic traction control是bmw的牵引力控制系统
【在 B**Y 的大作中提到】
: 据事主说是的。DSC就是宝马的traction control吧？
: 之前看youtube上飞掉的都是corvette，兰博基尼一类的超大马力车，没想到400马力的
: 也能飞。traction control对后驱车有这么重要？
|
B**Y
发帖数: 786 | 7 竟然还有轮胎温度！太厉害了
【在 L*****g 的大作中提到】
: 好吧，我估计DSC off，引擎声音听起来像是冷车，没有注意轮胎温度。后胎不到50度
: ，我是不会push hard的。如图：
|
B**Y
发帖数: 786 | 8 原来是这样 事主没说dtc 但是提了mdm也关了
【在 p*********e 的大作中提到】
: DSC = dynamic stability control
: 是bmw的ESP
: DTC dynamic traction control是bmw的牵引力控制系统
|
s***i
发帖数: 10182 | 9 现在开m3这些都是baby sitting
关了电子都不会开
这些司机还是先拿miata练练
【在 B**Y 的大作中提到】
: 据事主说是的。DSC就是宝马的traction control吧？
: 之前看youtube上飞掉的都是corvette，兰博基尼一类的超大马力车，没想到400马力的
: 也能飞。traction control对后驱车有这么重要？
|
o*v
发帖数: 371 | 10 估计增压发动机还是不好控制，突然给你来个torque surge后轮马上打滑，所以后驱车
涡轮增压不好开，awd还好点。
这哥们也是没经验，速度又不快，一松油门把住方向就好了，踩刹车就是挂
【在 B**Y 的大作中提到】
: 连M4这种马力不算超大的都会直线开着开着就飞了？
: https://www.youtube.com/watch?v=miA5qj5ergM&ab_channel=DrewStorms
|
|
|
L*****g
发帖数: 311 | 11 其实只要胎温上去了，如果不下雪结霜，夏季胎在冬天的抓地力也还是不错。普通三系
也可以coding把这个弄出来，强力推荐给在大冬天开夏季胎的宝马童鞋们。
【在 B**Y 的大作中提到】
: 竟然还有轮胎温度！太厉害了
|
v******d
发帖数: 227 | 12 m4马力已经算很高很高了.. 而且后轮只有很细的275 轮胎， 转弯的时候碰油门分分钟
spin.
但他这个spin很奇怪，难道一个轮胎先失去抓地力，diff lock up 后另外一个轮胎的
开始把车推向一边？我车dtc全关后直线起步要spin也是两个后轮一起spin，没体验过
单个后轮
spin，有lsd的车不应该会有单轮spin的情况吧. |
v******d
发帖数: 227 | 13 miata几乎不会碰到power over steer，但m3这种车最需要的就是throttle management
吧。
【在 s***i 的大作中提到】
: 现在开m3这些都是baby sitting
: 关了电子都不会开
: 这些司机还是先拿miata练练
|
a*****3
发帖数: 10373 | |
p*********e
发帖数: 32207 | 15 转过来了：
Hey guys,
It was my car that was involved and a mistake was made. There were no
intentions of doing anything out of the norm. In fact, you'll notice in the
video that the car was going very slowly in front of the crowd. This was
intentional because we've all watched too many YouTube videos of this sort
of thing happening and wanted to make sure that nobody would get hurt should
anything unexpected happen. Once the car was past the crowd the accelerator
was pushed in a straight-line as I have done many times in the past when
the rear snapped violently. The car was going ~30mph at that time. The car
has been driven for 4700 miles and has been driven with DSC off many times
including in the rain and never has the car snapped so violently just from
accelerating. I chalk it up to several factors including cold temps (low 40s
), cold tires and incorrect psi (more on that later) and of course driver
error. More judicious use of the throttle should have been exercised. MDM
mode was not used because MDM is too quick to intervene and cuts power
prematurely (or maybe not).
Usually when the rear breaks loose, it does so progressively and steering
correction will suffice. However, you can see in the video that the front
tires are turned slightly to the right indicating opposite lock was put on
the steering trying to prevent the car from doing a complete 180 however
there wasn't enough real estate to counter how violently it snapped - though
admittedty the gravity of the snap required immediate full oppo lock which
was misread. I'm not sure why some are saying that no steering input was
made because it was - one could argue it should have been sooner but again
usually a little wiggle just takes small steering input and power through
not a full-on immediate opposite lock as was needed in such a big snap - to
me it actually seemed like it was happening in slow-mo although the vid
makes it seem like it happened so fast. As the car started to correct it
became apparent that there was no way out except over the curb which is
where I put on the brakes and tried to straightline the curb as much as
possible to avoid hitting the curb at an angle which would cause a lot of
damage and potentiality flip/roll the car.
I've driven many high hp rwd cars including vipers, porsches, corvettes, and
formula cars and I've graduated from formula racing schools and have years
of training in advanced car control and plenty of track time. Heck I
remember day one of Formula school, half of the first day was spent on the
skid pad learning how to keep a car from spinning if you lose traction.
Maybe I need a refresher since it's been awhile and I've been driving AWD
Audis for the past few years. Some of those other RWD cars I mentioned will
snap fiercely and you have to be on extremely high alert, however my
experience with the M4 has been that it tends to not snap so viciously in a
straight line - but this time I was wrong. I would caution anyone thinking
that it can't happen to them (count me as previously one of those) that
anyone can make a mistake. I'm thankful that nobody was injured from such a
mistake. Surprisingly, the car seems to be driving just fine with the only
damage being the right plastic guard underneath the bumper which can be seen
in the video. Surprising I know.
I mentioned earlier that I had incorrect PSI - let me explain. My PSI was
low, so I inflated it a bit with a pump with an analog tire guage which of
course is very imprecise compared to a digital gauge. I noticed that my
right tire pressure was 1.5psi off of my left when viewing the PSI from the
BMW onboard digital gauge (you can only do this while driving). However, as
my car had been pulling to the right from day 1 of delivery (there's a big
thread of many complaining about that on these forums). Miraculously, the
car drifted to the right to a lesser extent with the right tire PSI being
slightly higher than the left and so I was playing around with the idea of
keeping it that way for a short time- however I knew that I needed to put
the PSI equally across both tires but I just failed to do that before going
to the meet. I have no idea if unequal PSI left to right contributed to the
right rear spinning so differently than the left.
Anyways, I know I'll be ridiculed and called an idiot (and rightfully so)
but I think many of you also know that I didn't do anything intentionally
out of the ordinary or unsafe. I'm not sure I was even trying to show off as
acceleration happened when the car was past the crowd and it's not like a
powerslide or burnout or anything of that sort occurred.
I also think the M4 is a fine car and I have no complaints about the amount
of power or torque or tire width or grip or anything. In fact, the whole
reason I got the M4 is because it's not AWD and I like the rear moving
around a bit. Mistakes happen and I've learned a lesson - and from now on
will keep DSC on when driving around because there's too much at stake to
make a mistake while driving - no matter how good or bad of a driver you are
. Thanks for hearing me out. It certainly has been a humbling experience.
【在 a*****3 的大作中提到】
: Really old news.
: 这是事主的的陈述：
: http://f80.bimmerpost.com/forums/showthread.php?p=17171373#post
|
B**Y
发帖数: 786 | 16 这个好。那夏季胎在夏季会大致有多少度
【在 L*****g 的大作中提到】
: 其实只要胎温上去了，如果不下雪结霜，夏季胎在冬天的抓地力也还是不错。普通三系
: 也可以coding把这个弄出来，强力推荐给在大冬天开夏季胎的宝马童鞋们。
|
L*****g
发帖数: 311 | 17 DSC off，胎温太低，看来我猜得八九不离十
the
should
accelerator
【在 p*********e 的大作中提到】
: 转过来了：
: Hey guys,
: It was my car that was involved and a mistake was made. There were no
: intentions of doing anything out of the norm. In fact, you'll notice in the
: video that the car was going very slowly in front of the crowd. This was
: intentional because we've all watched too many YouTube videos of this sort
: of thing happening and wanted to make sure that nobody would get hurt should
: anything unexpected happen. Once the car was past the crowd the accelerator
: was pushed in a straight-line as I have done many times in the past when
: the rear snapped violently. The car was going ~30mph at that time. The car
|
L*****g
发帖数: 311 | 18 夏天注意这个比较少，隐约记得环境温度 + 20/30吧，track上前胎温度会比后胎高很多
【在 B**Y 的大作中提到】
: 这个好。那夏季胎在夏季会大致有多少度
|
B**Y
发帖数: 786 | 19 后驱车真是不一样。audi的sport differential说拐弯的时候觉得拐不过来还可以再给
点油。本来还想下一辆换个M3/4 c63 一类的车，现在觉得还是没那个驾驶技术
m4马力已经算很高很高了.. 而且后轮只有很细的275 轮胎， 转弯的时候碰油门分分钟
【在 v******d 的大作中提到】
: m4马力已经算很高很高了.. 而且后轮只有很细的275 轮胎， 转弯的时候碰油门分分钟
: spin.
: 但他这个spin很奇怪，难道一个轮胎先失去抓地力，diff lock up 后另外一个轮胎的
: 开始把车推向一边？我车dtc全关后直线起步要spin也是两个后轮一起spin，没体验过
: 单个后轮
: spin，有lsd的车不应该会有单轮spin的情况吧.
|
a****n
发帖数: 4734 | |
e**n
发帖数: 1326 | 21 都DSC off了....这不是准备好玩甩尾吗. BMW下雪天就算DSC全开，大油门下去车尾也
会先滑出去不少的。 |
