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    Member No: 33272 casper is an unknown quantity at this point casper's Avatar
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    Driving Z4 in heavy rain feels unsafe

    I drove the Z4 last night in heavy rain, it feels unsafe, I felt like it would hydroplane easily. I had to keep the speed down to 40mph in the highway. Maybe it just feels unsafe, or is it?


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    are you coming from another rear-wheel drive car?


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    Yes, compared to a 530i.


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    BombayZ4
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    I believe...

    much like tramling, it is the width of the tire to the weight of the vehicle that causes this. The same was true for my Corvette and Camaro, both very easy to fishtail on wet roads at speed, especially if the roads have worn tire grooves in them.

    I have read about the tramling and it appears that some tires, like the Toyo with the chevron tread design greatly reduce the effect. By rounding the edges of the tire, the tramling is reduced. Not sure if they made them in run flat yet, but you are seeing more and more sport cars with them.

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    Re: Driving Z4 in heavy rain feels unsafe

    I personally felt more uncomfortable in my '92 ZR-1 Corvette.
    At highway speeds in sustained heavy rain, the front brakes loaded
    up with water so much that you felt that you would need to make an
    appointment if you wanted to slow down.

    I've only had my Z4 out once for any distance in the rain on the
    highway and I certainly felt more at ease with the brake response;
    don't really recall hydroplaning being an issue, although this is
    obviously a factor with just about any wider performance tire, to
    some degree...(?)

    <br>jim

    <img src="http://members.roadfly.com/brown1706/2003Z4-01RX.jpg" border="2" width="160" height="120">

    <a href="http://autos.groups.yahoo.com/group/BMW-Z4/">BMW-Z4 Group</a>

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    Heavier car, smaller hp/weight.

    <br>


    <table><tr><td><img src=http://members.roadfly.org/wclhc/rflyavatar.jpg></td><td valign=top><a href=http://64.85.2.203/cbishop/zpg.htm><img src=http://members.roadfly.com/cargogal/zeattle.gif border=0></a>
    <font face="comic sans ms" size=2>If you can't go fast with 90hp, 900 won't do you any good.<br><i>-bwob</I></font></td></tr></table>


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    I hadn't really noticed a problem.

    I've had mine in all sorts of rain and didn't notice a "problem." Its a relatively light car with wide sport tires. I drive it differently in the rain than my 4Runner, but I have confidence in it. <br>2003 Z4 2.5 5 spd
    Titanium Silver/Black Leather
    Prem/sport/conv/heated seats

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    Re: Driving Z4 in heavy rain feels unsafe

    Don't let anyone convince you to drive faster -- certainly stick to your instinct and don't go any faster.

    Coming from a 2200lb mid-engine car, the Z4 feels like a rock to me in the rain.

    I've only had my Z in rain a few times, kept it under 60-65 and never felt unsafe.

    One tip would be to drive in a much higher gear than you normally would, so that you avoid too much torque which would spin the rear tires. Of coures, keep traction control and all that on.<br>--
    2003 Z4 3.0 Jet Black/Red 6spd/Sport/Xenon/Premium/Convenience/Heated/Changer
    TX Plates: POUT
    [<a href="http://www.cuckoo.com/daniel/pictures/cars-z4">Pictures</a>]

  9. #9
    John UK
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    Hi Z4me good to hear from you again. You, "Visser"

    and others were our early introduction to the Z4 here in the UK with the regular posts. I get my car in 4 weeks - hope I enjoy it as much as you obviously do. Thanks, John

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    Also: practice

    When I get a new car I like to practice in the rain (and in snow if it's a car that I would take in the snow, which the Z4 isn't).

    I'd find an empty parking lot, or a smooth empty blacktop road in a new subdivision, especially one with those round turnaround areas, and see what really happens.

    Generally speaking, if the road is just pretty wet, the tires seem to stick. However -- and this is what makes it all tricky -- a little standing water can take your feet right off the ground.

    Find a nice puddle area and zoom into it, see what happens.

    On the expressway, you can usually feel the difference when you are in the worn down tramline grooves, and up on the parts of the road that aren't so worn.

    All this, of course, is done where there aren't cars, kids, or other things you'd like not to run into. <br>
    Merlot 3.0 Sport all but Nav
    Beige / Beige. Old driver, new car.
    www.XProgramming.com/z4

  11. #11
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    Lucky to be alive

    Quote Originally Posted by casper View Post
    I drove the Z4 last night in heavy rain, it feels unsafe, I felt like it would hydroplane easily. I had to keep the speed down to 40mph in the highway. Maybe it just feels unsafe, or is it?
    I went into a spin on I95 in Florence South Carolina....my 2012 Z4 started fishtailing then spun full 360. I was frozen in shock...ended up on the shoulder. I will never drive it above 40 in the rain again.
    Reply With Quote Reply With Quote 108.162.210.195

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