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Thread: 129 Mph

  1. #1
    Katobud is offline Cadillac Owners Member
    Automobile(s): Seville STS
    Join Date
    Aug 2005
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    DFW
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    129 Mph

    I was going out town this weekend and decided that I was going to push my 99 STS to the limit. I floored it and was only able to reach 129 MPH. I drove like this for about 40 sec and was not able to go any faster. Why was this?


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  3. #2
    iametarq's Avatar
    iametarq is offline Cadillac Owners Connoisseur
    Automobile(s): 98 Deville, '15 Ford Fusion Hybrid Titanium, '12 Ford Escape
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    Dec 2004
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    Petoskey, MI
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    Re: 129 Mph

    Check your door sticker, and see what your tire rating is. Unless you've got Z rating on there you're not gonna get that fast. Speed is limited electronically.

  4. #3
    Join Date
    Feb 2006
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    Jackson, MS
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    Re: 129 Mph

    probably H-rated (130mph)

  5. #4
    ShadowLvr400's Avatar
    ShadowLvr400 is offline Cadillac Owners Connoisseur
    Automobile(s): 1996 Fleetwood
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    Oct 2003
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    Central Florida
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    Re: 129 Mph

    Governor. Blech.

  6. #5
    FredMaxwell Guest

    Re: 129 Mph

    You think that's bad,
    My Seville will only do 112

    I tell you what last time I ran down to ark city back in my days it took quite a time longer than it does in the old '79
    The needle buries after 85 but I am pretty sure it does something like 130
    That's an old fashioned governor... just run it wide open until it won't go any faster :=)

  7. #6
    davesdeville's Avatar
    davesdeville is offline Banned
    Automobile(s): 1995 ETC, 75 Deville, Cad500 powered 73 Apollo, 94 Mark VIII
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    Aug 2003
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    Albuquerque, NM
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    Re: 129 Mph

    The 79 should max out around 120. My 78 Fleetwood Brougham averaged 115 or so for 4 miles on this road I use to do top speed runs (has mile markers for some reason.)

  8. #7
    FredMaxwell Guest

    Re: 129 Mph

    Quote Originally Posted by davesdeville
    The 79 should max out around 120. My 78 Fleetwood Brougham averaged 115 or so for 4 miles on this road I use to do top speed runs (has mile markers for some reason.)

    It would have the same motor, then, and the same rated HP unless you had the injected one.

    I'm pretty sure mine does right at 130 though.

  9. #8
    Intheknow is offline Cadillac Owners Fanatic
    Automobile(s): 2001 STS
    Join Date
    Aug 2005
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    149

    Re: 129 Mph

    I had a '53 Sedan De Ville with a really funky intake manifold and carb that would do 120 all day long, but would never go any faster. Then I had a '69 Sedan that was the same way, but it was at about 125. I haven't had my 2001 STS any faster than 130, but then I haven't ried either. It came with "W" rated tires.

    Just because a car comes with speed rated tires doesn't mean the car will go as fast as the tires are rated. Tires don't make speed. All the tire speed rating means is that Cadillac put those tires on that particular car because of the (or lack of) speed limiter.

    My Olds Aurora came with "V" rated tires and it was speed limited at 139. I could never get it faster than 135. I put "H" rated tires on it because they were cheaper and lasted longer than "V" rated. When the Pirelli's wear out on the STS, I might go with a much slower rating than "W" because I'm not racing the ol' girl and I can save money with lower rated tires.

  10. #9
    Join Date
    Mar 2004
    Posts
    50

    Re: 129 Mph

    I havent tried to go much over 120. I dont find I need to go that fast anymore anyways.


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