1990 Brougham top end?
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 1990 Brougham top end? in Past Cadillac Vehicle Discussion; I have had it up to 90 MPH several times. What can I look at for top end? I have ...
  1. #1
    ohio boy is offline Cadillac Owners Member
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    1990 Brougham top end?

    I have had it up to 90 MPH several times. What can I look at for top end? I have also been told that if I drill a hole in the cat. converter I will get a little better performance. Is this right? If yes how big of a hole and where?

    ohio boy

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    M5eater's Avatar
    M5eater is offline Cadillac Owners Connoisseur
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    Re: 1990 Brougham top end?

    I couldn't tell you the top speed, but I can tell you do not drill a hole in your cat..

  4. #3
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by ohio boy
    I have had it up to 90 MPH several times. What can I look at for top end? I have also been told that if I drill a hole in the cat. converter I will get a little better performance. Is this right? If yes how big of a hole and where?

    ohio boy
    Which motor do you have?
    Top speed on an olds 307 is 120+ (but you'll have to find many many miles of flat straight ground for it to go that fast)
    Personally (and I don't recommend this because these cars have 0 handling at triple digit speeds) I have done 110-115 in my caddy (once)
    Top speed on a 350 is 130+, if the computer doesnt shut off your fuel supply first (105 or 110 IIRC). Truck computers will also go faster and make more power than a performance car (iroc camaro/ TA) computer. (Bump timing over 3k instead of retarding it and no fuel cutoff IIRC)

    You aren't going to get much of a boost by drilling a hole in your cat (I assume you mean gutting it, which is illegal in some states). Removing your cat and installing a straight pipe might net you 2 hp...maybe....they aren't as restrictive as they were back in '74 when they came out. If you want to get more performance, try legitimate performance mods (CAI intake, headers/ dual exhaust, adjusting the carb/ bigger injectors on tbi etc.)

  5. #4
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
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    Re: 1990 Brougham top end?

    Quote Originally Posted by cadillac kevin View Post
    You aren't going to get much of a boost by drilling a hole in your cat (I assume you mean gutting it, which is illegal in some states). Removing your cat and installing a straight pipe might net you 2 hp...maybe....they aren't as restrictive as they were back in '74 when they came out. If you want to get more performance, try legitimate performance mods (CAI intake, headers/ dual exhaust, adjusting the carb/ bigger injectors on tbi etc.)
    Unless it is failing and getting plugged.

  6. #5
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Re: 1990 Brougham top end?

    Quote Originally Posted by talismandave View Post
    Unless it is failing and getting plugged.
    I don't think you could do 90 mph many times if it was plugged up.

  7. #6
    talismandave's Avatar
    talismandave is offline Cadillac Owners Master
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    Re: 1990 Brougham top end?

    They do start going bad and gradually get worse. It isn't like a switch that goes from perfect to plugged. That is why I said "failing and getting plugged." Whatever, it was merely an observation....never mind.

  8. #7
    ohio boy is offline Cadillac Owners Member
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    Re: 1990 Brougham top end?

    Thank you all. No hole drilling then. And keep it under 100.

    ohio boy

  9. #8
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by ohio boy
    Thank you all. No hole drilling then. And keep it under 100.

    ohio boy
    What motor does your brougham have (just curious)

  10. #9
    AElayyat's Avatar
    AElayyat is offline Cadillac Owners Connoisseur
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    I got my 90 up to 105 or 110 once & don't recommend it...these big body broughams suck after 85mph

  11. #10
    cadillac kevin's Avatar
    cadillac kevin is offline Cadillac Owners Master
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    Quote Originally Posted by AElayyat
    I got my 90 up to 105 or 110 once & don't recommend it...these big body broughams suck after 85mph
    Yes they do...I could watch the gas gauge go down very quickly when I went on the top speed run in my fwb (3 or so minute romp cost me 3 mpg over a full tank). It took forever to get over 100 once it got to 80 (0-100 is counted in minutes, not seconds.) Then theres the problem of the body sway shoving the car around even in sweeping curves.

  12. #11
    ohio boy is offline Cadillac Owners Member
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    Re: 1990 Brougham top end?

    to kevin it has the 307. runs very smooth.

    ohio boy

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