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BMW 3-Series (E90 E92) Forum
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Rain Rain Rain
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03-11-2008, 12:32 AM | #1 |
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Rain Rain Rain
I hate driving when it is wet out... I can barely touch the gas pedal from a stop without having my tires spin... Oh well, I guess things could be worse... I could still be driving a honda
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03-11-2008, 01:04 AM | #2 |
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haha i know what you mean, the first week i transititioned from my integra to my e90, i had trouble with overdoing the throttle too. But in all honesty, it's the runflats!!!! they suck so badly.
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03-11-2008, 01:51 AM | #3 |
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the runflats arent too bad, just needs to be warmed up , as for the rain.. yes it sucks..
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03-13-2008, 12:16 PM | #5 |
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335 + PROcede v2 + rain = wheel spin
328 + rain = no wheel spin the xi probably helps a bit, but i'm pretty sure the wheel spin is due to the increase power of the 335 w/ procede, not to mention the RFT's.
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03-13-2008, 12:32 PM | #6 |
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Of course power is also a factor, in that it is much harder to spin an underpowered car. That being said, I have driven the 328i (RWD) and it also slides around during aggressive driving. The fact that the 335xi is faster than a 335i (according to BMW) highlights this point. Unless you have installed a LSD, the BMW RWD cars are really "one wheel drive" -- as opposed to an xi where you have power going to all 4 wheels.
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03-13-2008, 02:01 PM | #7 | |
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No, you don't have power going to all 4 wheels unless you are driving perfectly straight with all four wheels having identical traction. The sames goes for RWD cars, they have power going to both rear wheels in equal amounts, except when there is an imbalance in traction. Or, when one wheel is spinning faster than the other. This happens all the time, to both RWD and AWD cars, no matter how sophisticated the system. Every time you make a turn, the outside wheels will spin faster than the inside ones. This is the reason for the differential, and where it gets its name from. If the wheels couldn't spin at different rates, you'd wear down your rear tires in a hurry. If the front wheels couldn't spin at different rates, you would have a very hard time turning. But that is getting a little technical....... The xi system does not have LSDs in the front or rear differentials, just like the i series don't have rear LSDs. It uses electronics to control wheel spin, just like the i series does. But if you defeat DSC/DTC fully and place the car on a surface where one front and one rear wheel have zero traction, the car won't move. So while the i may be called "one wheel drive", the xi should be called "two wheel drive." The only true "four wheel drive" would be a vehicle with front and rear locking differentials and a locking transfer case. You will find that kind of system on a rockcrawler Jeep, but not in a passenger car.
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03-13-2008, 05:26 PM | #8 |
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+ if you don't know how to drive may be?
People (including me) have been driving cars with over 350hp in WA State for years and yet the spin the wheels unintentionally in rain..... So please don't make it sound like it is impossible to drive this car in rain. If you know what you are doing you will be fine even with a 550hp car.
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03-13-2008, 05:45 PM | #9 | |
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1) I don't quite understand that first sentence, i think you made a typo somewhere... Either way, I think I understand the point you are trying to make... 2) to quote myself: "I hate driving when it is wet out... I can barely touch the gas pedal from a stop without having my tires spin... Oh well, I guess things could be worse... I could still be driving a honda " I didn't say it was impossible to drive in the rain. I simply stated that FROM A STOP you can't accelerate hard without the wheels spinning. I am aware of the technique used by many drivers out there that involves using the gas lightly which will enable me to drive safely in the rain. Still, I find it much more enjoyable to drive my car when it is dry out and I do not have to use this driving technique.
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03-13-2008, 06:49 PM | #10 |
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03-13-2008, 10:13 PM | #11 | |
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On a personal experience note -- I have disengaged my DSC before in the snow (just to see what happens) and it sure feels like all 4 wheels are digging. Below are excerpts from various tech discussions of xdrive found on the web: In an extreme case, BMW xDrive is even able to fully disconnect the front and rear axle from one another or, conversely, connect them rigidly to one another as one combined drive system. So proceeding from the standard 40 : 60 power distribution front-to-rear, the spread of engine power may be varied infinitely all the way from 100 : 0 or 0 : 100. Without the driver even noticing, therefore, his BMW becomes a rear-wheel-drive-only or – should this be required on account of a very low frictional coefficient at the rear, a front-wheel-drive-only car at least for a few short moments. Should a rigid connection of the two axles be required, on the other hand, xDrive builds up a longitudinal lock, providing permanent all-wheel drive with 50 : 50 power distribution. Further, when DSC takes corrective braking action on a single wheel, torque is automatically redirected to the wheel opposite it. This means the BMW xi can keep moving even if only one wheel has traction. |
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03-14-2008, 12:47 PM | #12 | |
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More than likely, in everyday driving, you will not encounter a situation where the xi system won't get you moving. And who drives around in the rain with all the stability systems turned off anyway? So on our rain soaked NW roads, the xi system will smoke the RWD cars. Basically, I'm justing busting your chops for thinking the RWD cars are "one wheel drive" and AWD cars are "all wheel drive" when really they are "two wheel drive!"
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03-14-2008, 07:02 PM | #14 | |
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