130mph??
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Northstar Engines and System Technical Discussion Discussion, 130mph?? in Cadillac Engine Technical Discussion; Ive read on hear alot of people w/ '94 - '97 seville sls and sts say their car will go ...
  1. #1
    1997 Cadillac SLS's Avatar
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    Question 130mph??

    Ive read on hear alot of people w/ '94 - '97 seville sls and sts say their car will go 130mph or 140mph!??

    my '97 sls cuts off at 110mph or so?

    how do yall go 130mph?

    did yall do a mod or something, enlighten me please

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    JimD is offline Cadillac Owners Connoisseur
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    Re: 130mph??

    Vehicle speed is limited by the PCM according to the speed rating of the OEM tires installed by GM/Cadillac. Look for the OEM tire speed rating on the tire information sticker (driver's door panel ?).

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    1997 Cadillac SLS's Avatar
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    Re: 130mph??

    Quote Originally Posted by JimD
    Vehicle speed is limited by the PCM according to the speed rating of the OEM tires installed by GM/Cadillac. Look for the OEM tire speed rating on the tire information sticker (driver's door panel ?).

    thanks for responding so quickly....

    the letter is "S" for front and rear

    so what does "S" stand for, and is there any way to change the code in the comp. to make it go a little faster?

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    JimHare's Avatar
    JimHare is offline Cadillac Owners Connoisseur
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    Re: 130mph??

    S simply means that the tires ORIGINALLY placed on your car, at the factory, are 'speed rated' (a MFG thing, not a carmaker or Gov't thing) to 112 mph. Thus, the PCM on your car was tickled to limit the car's speed to that.

    There is no practical way to increase that. Putting H or Z rated tires on will do nothing. The PCM would have to be reprogrammed by a dealer, and common knowledge seems to be that, unless YOU are the dealer, it will not be done. Liability issues.

    Live with 112 or get a different car and check the door sticker.

    Sorry, but that's the way it is. My ETC has H rateds from the factory, so I'm limited to around 130. The RARE Z-rated cars will hit 150.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 130mph??

    Quote Originally Posted by 1997 Cadillac SLS
    so what does "S" stand for?
    Slow

    Sorry, couldn't resist.

  7. #6
    SL1CK's Avatar
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    Re: 130mph??

    Haha, wow ranger I never see that type of comedy out of you. Haha.

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    Re: 130mph??

    Quote Originally Posted by Ranger
    Slow

    Sorry, couldn't resist.
    lol thats great ranger ha ha whats H W and Z stand for

  9. #8
    1997 Cadillac SLS's Avatar
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    Re: 130mph??

    yeah I know 110mph top speed is pretty slow, civics can blow past me on the beltway HAHAHA...oh well~

  10. #9
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    Re: 130mph??

    I ran my 2001 STS up to 120 mph the other day and it got there fairly easily , so I thought it would have a 140 mph capability . the next day when I gave it a whirl it cut out @ 130 mph . It would have done the 140 if allowed but not much more.

  11. #10
    weister42 is offline Cadillac Owners Enthusiast
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    Re: 130mph??

    So if I give the dealer some money I can have them reprogram my PCM to have 130mph limit? My car cuts off at 112mph and I just got some Goodyear's rriple tread assurance tires are are rated H I think.

  12. #11
    Night Wolf's Avatar
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    Re: 130mph??

    ah... that '93 STS I was looking at here is Z rated.....

    make some good time going back to NY...

  13. #12
    WOTMODE is offline Cadillac Owners Fanatic
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    Re: 130mph??

    I've had my 95 sts pegged at the 150 mark. Your best bet is to get a vin# off of ebay from a car that was originally equipped with "z" tires. Go into a Caddy dealer, walk straight into the shop and look for the "cool" dude. Flip him a $50 and ask him to reprogram your car.

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    SL1CK's Avatar
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    Re: 130mph??

    Feels good to have a Z rated caddy. 150+ mph for me.

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    Re: 130mph??

    Quote Originally Posted by weister42
    So if I give the dealer some money I can have them reprogram my PCM to have 130mph limit? My car cuts off at 112mph and I just got some Goodyear's rriple tread assurance tires are are rated H I think.
    Not too likely Weister. Any trial lawyer reading this is salivating by now. I seriously doubt you'll find a dealer willing to take the liability risk for the few bucks he'd make doing it for you. Besides, were are you going to go 150 MPH around Stevens Point?

  16. #15
    deabionni is offline Cadillac Owners Member
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    Re: 130mph??

    Only the "Z rated" Caddys can hit speeds over 130MPH. Check your door sticker. If yours is "Z rated", then you have no speed limiter.



    Not that I'll ever hit those speeds in my car, but it sure is nice to know that I could.

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