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Thread: Top speed test M6 transmission. Found speedlimmiter

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    Top speed test M6 transmission. Found speedlimmiter

    Found out that there is some kind of speed limmiter at 206 mph / 330km/h right around 5700rpm on 6 gear. I have 640 rwhp and ofcourse aftermarket tuning.


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    DCV is offline Cadillac Owners Enthusiast
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    Re: Top speed test M6 transmission. Found speedlimmiter

    Thats called drag.....

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    Re: Top speed test M6 transmission. Found speedlimmiter

    or friction........ I-10 in west Texas????????

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    Club Malibu is offline Cadillac Owners Enthusiast
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    Re: Top speed test M6 transmission. Found speedlimmiter

    I recall years ago that Renntech while tuning their super high horsepower Mercedes kept hitting hidden secret rev limiters in the software. Stock I think was around 150 mph, then then cracked that part of the software code then again about 170, then again at 200 and I think it was straight fuel cutoff at 212+. They did not know why. They thought it was just safeguards against people like them killing themselves.

    Maybe 206mph is the magic number where the V generates lift. Or parts start flying off the car.

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    quikag is offline Cadillac Owners Fanatic
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    Re: Top speed test M6 transmission. Found speedlimmiter

    I call BS without pics or vid.

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    Re: Top speed test M6 transmission. Found speedlimmiter

    Quote Originally Posted by quikag View Post
    I call BS without pics or vid.
    Or ride-along.....

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    Re: Top speed test M6 transmission. Found speedlimmiter

    Why would i lie about that? Its not that big of a deal to go 206 mpg with a big straight road without out cars and i am not from the US so thers is not cops everywhere.

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    Quote Originally Posted by caddilac2
    Why would i lie about that? Its not that big of a deal to go 206 mpgwith a big straight road...
    See! We knew it was a lie! LOL

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    spearfish25 is offline Cadillac Owners Enthusiast
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    Re: Top speed test M6 transmission. Found speedlimmiter

    640 rwhp in a V isn't getting you to 206mph unless you're shot out of a cannon.

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    2013CTSV is offline Cadillac Owners Member
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    Quote Originally Posted by spearfish25
    640 rwhp in a V isn't getting you to 206mph unless you're shot out of a cannon.
    I don't really agree, I've hit 170 in my car based on the speedo and the car was still pulling quite healthily. I'm at about 500-525 whp right now so it does not seem so far fetched.

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    nsaness is offline Cadillac Owners Enthusiast
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    Re: Top speed test M6 transmission. Found speedlimmiter

    How was your windshield at that speed?
    With all windows closed, my windshield allows air to pass through at 165 to 175 mph (in Mexico, on a closed airstrip, of course). The wind noise is quite loud, and the windshield shakes and vibrates quite a bit. It did not inspire confidence for a 200 mph run, but maybe my car is the only one with this "problem"

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    Re: Top speed test M6 transmission. Found speedlimmiter

    Drag or friction...........

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    I think people underestimate how much power it takes to up your top speed when nearing the 200mph barrier.

    If 191mph is the top end for an M6 V, I'm guessing you need at least 100 more hp to even think of nearing 200. Probably another 100 to go over and get in the low 00s over 200.

    ----------

    Especially with the high resistance the V's frontal area presents...

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    Re: Top speed test M6 transmission. Found speedlimmiter

    On the chassis dyno you can go past 220 mph with 3.42 gears. Your tuner didn't shut off something if there is a limiter at that mph.

    Send the tune over and I will delete the limiter.

  16. #15
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    The faster you go the more the earths atmosphere resists.
    The Bugatti Veyron (one of the most slippery cars in the world) "needs" 1,200 HP and 1,106 foot lbs of torque to reach 253 mph.
    There's only one guy I know of on this forum to reach/exceed 200 mph in a V. I wonder what HP it took to get there.
    Last edited by vfaninva; 07-02-14 at 02:59 PM.

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