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Old 10-09-2009, 05:19 AM   #1
dbworld4k
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*HELP* Severe hydroplaning/shifting rear on wet roads.

At speeds above 50mph, my car's rear end becomes severely unpredictable in even the slightest of rainfall/wet roads. It feels like the car is sliding on ice! This has been happening recently for the past week or so. I know temperatures are getting into the low double digits but that cannot explain the horrible traction I have in the wet.

I have Falken FK452s and Dunlop DZ101 in the front, all tires have PLENTY of tread left. I have a bit of toe-in in the rear, otherwise the alignment seems perfectly fine. The car drives like a charm in dry conditions. I am going to check the tire pressures tomorrow morning, but I can't think WTF could cause such dangerous driving. This is making me seriously nervous whenever it rains.

edit: FML. Title should read WET not west
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Old 10-09-2009, 08:12 AM   #2
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Wondering if the compound is not providing enough traction under load. Have you swapped the fronts and rear tires to see if it is only affected the rear set of tires? Do you have a LSD?
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Old 10-09-2009, 08:35 AM   #3
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remember this thread?:

http://www.maxbimmer.com/forums/show...light=rear+end
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Old 10-09-2009, 08:39 AM   #4
Stephanie
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Slemmer, I was in the car with him last night... It's actually pretty scary... The car will be driving along perfectly fine and then it almost "stutters" to one side suddenly...

And, yes, he's got LSD.
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Old 10-09-2009, 10:12 AM   #5
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The FK452 is directional. Are you sure they're mounted with the correct orientation? That would be the most obvious cause. Otherwise, I'd wonder if there's an internal LSD lockup problem
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Old 10-09-2009, 11:04 AM   #6
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My e36's rear end was always twitchy in rain, and very unstable. This was however, the tires, as soon as I went to softer compounds twitch vanished
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Old 10-09-2009, 11:06 AM   #7
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just a few random thoughts:

It might be worth a try with 0 toe in. As road conditions vary from right to left tires, the toe in can kick the ass end around.

The stutter could be LSD related or maybe just one tire catching a section of dryer road.
Did it happen at all during the summer or just recently with the temp drop? If it is your LSD then the temp should not make a significant difference.

Symptoms sound similar to towing a trailer with negative tongue weight.
Any co-relation to the amount of gas you have in the tank? (extra rear end weight help at all?)

I have had this issue with my Subaru outback, scary as hell! I noticed a significant improvement when I put on my winter tires.

Good luck!
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Old 10-09-2009, 11:36 AM   #8
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Quote:
Originally Posted by hockeyfan27 View Post
It might be worth a try with 0 toe in. As road conditions vary from right to left tires, the toe in can kick the ass end around.
No, any form of toe out at the rear would make the car even more twitchier. They come stock from the factory toed in at the rear, so his car is correct.

If the tires aren't the problem, ever looked at the suspension? Any bushings or mounts that could shift under load? That might possibly be the culprit, changing toe as you drive.
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Old 10-09-2009, 11:38 AM   #9
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I just checked the pressures and rotation, everything seems normal tire wise. Only thing I can think of now is alignment or suddenly worn out RTAB/RSMs :S

It only recently started doing this. I've been driving in the rain with the same setup for the past month and half and it never happened. I'm literally stumped here. Being under load or not makes NO difference whatsoever, which bewilders me even more lol.
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Old 10-09-2009, 11:52 AM   #10
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Alignment, get it checked... properly.
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Old 10-09-2009, 11:55 AM   #11
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Are you 100% that any rear end repairs were made to factory specs? I'd go to an independent shop of where you've been going and get them to check out the car.
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Old 10-09-2009, 12:14 PM   #12
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before you spend a pile of money trying to chase down a gremlin, do you know someone with a similar car who you could borrow a set of tires from for a few tests?
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Old 10-09-2009, 12:47 PM   #13
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I vote for checking the suspension carrier mounts. I was having similar problems and found that one side was ok but the other was almost completely worn.
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Old 10-09-2009, 05:27 PM   #14
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simple fix.. get a supercharger and next time it happens hit the gas harder.. the tires will just dig into the asphalt about an inch or two.
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Old 10-09-2009, 05:44 PM   #15
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Quote:
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simple fix.. get a supercharger and next time it happens hit the gas harder.. the tires will just dig into the asphalt about an inch or two.
+1
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