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    ASC

    I'm looking for some technical info on how ASC operates on my 98 528. I've done several different searches and haven't found much. I remember reading when TC first started appearing on cars back in the 90s that one of the control mechanisms was retarding power by cutting spark. There was mention of the posibility of overheating and damaging the catalytic converter due to raw fuel getting into the exhaust. I know the brakes will try to control initial wheelspin but does ASC cut spark or injectors? The reason I ask is that I have a winter driving school in a couple weeks and it's held on a frozen lake. I was out there a couple days ago and it's like a skating rink. The ASC light was blinking constantly just driving out on the ice and back. I'm concerned because I plan on having the ASC on most of the time to give real world experience and don't want to fry the cat. Any opinions?dave


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    It would appear from this discussion that the >>

    system only controls the brakes, not the engine:

    http://www.318ti.org/notebook/asc/index.html
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    Almost positive the 318 is not the same as an E39(

    ASC uses a secondary throttle to cut the air flow to the engine, reduce the timing, and most likely the fuel too. I doubt the Germans would forget to reduce the fuel as it would lead to an over rich condition, increased emissions, and poor running coming off of an ASC condition.
    See part #1
    Also pretty sure ASC doesn't apply the brakes, while ASC+T did the above and did some rear brake application.
    DSC did brakes on all 4 wheels individually as well as all of the above with the addition of an encoder on the lower steering column shaft to determine if the car was going where it was pointed.

    Dave, as long as you keep your car out of a snow bank your not going to damage anything. Get some studded snow tires on all 4 wheels and have fun. Post a few pics, don't think anybody has ever done any ice racing pics before.

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    Re: ASC

    The ASC does not cut the spark or the injectors - so will not cause damage to the engine or cats.

    When it detects wheel spin it uses various methods to prevent further slippage - depending on what wheel is spinning and what speed you are going.

    It first reduces engine power by retarding the ignition timing and also by electrically closing (controlling) the "aux" throttle (same affect as your backing off the accelerator pedal).

    It may also apply the main brake(s) to the rear wheel that is spinning - or if the car is going more than about 35 mph it applies the brakes to "both" rear wheels at the same time in order to maintain directional stability.

    Cheers
    Jim Cash


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    Re: Almost positive the 318 is not the same as an E39(

    Thanks for the info,guys. I've got blizzaks on all 4 corners. Unfortunately I can't figure out how to upload pics. It's also not a race but a driving school although I'm sure there will be a chance to get some spirited driving in at some point of time.dave

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    If you want, email a few pics and I'll post them






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    Re: If you want, email a few pics and I'll post them

    Jim. The school isn't for a couple weeks yet. I think it's about time I learned how to host pics as I think this whole internet thing might be around for a while. Thanks for the offer,though. I've got to find a teenager to show me how to do this stuff and will hopefully be able to have some pics up then.dave

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    Here'a a short "how to" (m)

    You can't post a pic from your computer.
    You need to upload it to some site that you can access for IE, Firefox, etc.
    I have 10Gig of space that Comcast provides with my email account.
    You can use Photobucket or many other free hosting sites.
    So after you upload your pic (resized to ~900 x 675 is a good fit) to what ever site, you them type the address in the (insert pic) and hit OK.
    You can practice by going to the "Test Forum" over on the right side of this page, it's under Specialty Automotive Forums......

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    Getting there

    Well,I'm getting closer. I've managed to get a couple uploaded. Eventually I'll get the pics linked but this is the best I can do for now. This was from when I went out to check out the lake. I'll have some more after the course. Thanks,Jim. dave

    http://s1098.photobucket.com/albums/g372/oversteer1/

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