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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Aug-31-2010, 03:57:38 AM   #1
jayweezy
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Default Suspension? RTAB? FCAB? New Tires? Car feels like its floating/hydroplaning

Guys, I always search the forums and do a pretty good job of finding answers for myself, but this time I am pretty stumped.

When I ABRUPTLY turn left and right (like when indy racers warm up tires) it feels like my car is hydroplaning or floating on dry surfaces. I read it could be RTABs and I just changed them out with OEMs and symptoms are still there. If I GENTLY go left and right back and forth, steering isnt as responsive or crisp. It feels like theres too much play before the car responds. Feels like it takes a second for the car to "catch up" to what im doing.

Ive also read a few threads where brand new tires can cause DSC to act funny, my symptoms are pretty close to the "brand new tire" problem but its been at least 500 miles ive put on them (general exclaim UHP rear, michelin sports front) also PSI is correct all around. I did realize this "floating" almost immediately after I put the new rear tires on, but I dont know how coincidental something else messed up right when the new tires were put on, or if this is actually the problem.

Any suggestions on what to do next? My RTABS were in almost brand new condition so i feel like I wasted money in that trial. I want to do FCAB next, but seems like they are in good condition as well and i dont want to blow money if its not gonna fix it. Help please?
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Old Tue, Aug-31-2010, 04:06:01 AM   #2
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I assume you got an alignment. Are they all within specs?
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Old Tue, Aug-31-2010, 04:09:44 AM   #3
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What do you consider correct tire pressure?
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Old Tue, Aug-31-2010, 04:11:45 AM   #4
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im getting an alignment thursday, but i dont think it would cause the car to feel like it was floating would it? not to the extent that its doing it at least. i highly doubt after my alignment is complete that the problem will be fixed, but we'll see. do our cars have any steering issues?
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Old Tue, Aug-31-2010, 04:12:09 AM   #5
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You should use the same tires front and rear
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Old Tue, Aug-31-2010, 04:21:58 AM   #6
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How many miles? If you're up there, bet you $100 it's the lower steering column flexible coupling (guibo)

Here is the thread on it http://forum.e46fanatics.com/showthr...19#post5997719. Part number 5, cost around 40 or so bucks. Read through the thread. You'll find your answer, a DIY, and where to buy the part.
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Old Tue, Aug-31-2010, 05:02:53 AM   #7
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Quote:
Originally Posted by jayweezy View Post
im getting an alignment thursday, but i dont think it would cause the car to feel like it was floating would it? not to the extent that its doing it at least. i highly doubt after my alignment is complete that the problem will be fixed, but we'll see. do our cars have any steering issues?
You definitely need an alignment after replacing your RTABs. Get an alignment first and report back. Rear alignment affects the fronts.
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Old Tue, Aug-31-2010, 05:19:32 AM   #8
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Quote:
Originally Posted by sfce46M3 View Post
You definitely need an alignment after replacing your RTABs. Get an alignment first and report back. Rear alignment affects the fronts.
And definately run the same model tires front and back...

I had the same issue when I had different tires on the rear...
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Old Tue, Aug-31-2010, 05:20:01 AM   #9
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I agree, you do need an alignment.
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Old Tue, Aug-31-2010, 11:44:43 PM   #10
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Change out the FCAB. My car felt like it was floating until I changed out the FCAB. Visually, you won't be able to tell if the FCAB is bad. Usually, the passenger side goes bad first since it's right next to the exhaust manifold. This part is not too expensive so I would just go ahead and change this part out if you haven't already. They only last about 50-60k miles. Also, if you have never changed out the steering coupler, I would change this part out as well since they only last about 50K miles as well.

Tires shouldn't affect the handling to be adverse. When I got brand new tires, my car handled much better compared to when I had worn tires. After changing out the bushings, if you are still having issues, then the ball joints in your suspension is probably worn and would need to be replaced.
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Discussing Suspension? RTAB? FCAB? New Tires? Car feels like its floating/hydroplaning in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)