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convertibles and horsepower

This is a discussion on convertibles and horsepower within the Firebird / WS6 forums, part of the Vehicle Specific category; just curious if anybody with a convertible has dyno numbers and what it would run at the track stock....

  1. #1
    now greybat66
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    navy blue metalic
    1998 trans am conv

    convertibles and horsepower

    just curious if anybody with a convertible has dyno numbers and what it would run at the track stock.

  2. #2
    Senior Member justinmc978's Avatar
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    sold: 1999 firebird
    1998 Trans Am

    Quote Originally Posted by purplebat66 View Post
    just curious if anybody with a convertible has dyno numbers and what it would run at the track stock.
    the same as a hardtop and maybe a tenth slower

  3. #3
    Member 02ragtop t/a's Avatar
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    sunset orange metallic
    2002 T/A convertible

    I had my car on a chassis dyno at some car show out in Ohio right after I bought it. It had 1,600 miles on it , no mods, completely stock and put 312 hp to the rear wheels. Don't remember the torque, have to look in the trunk as I still have the print outs, but it was around 330 fp's, in that area. Will check tomorrow and let you know.

    Or, you could come down to Spazapalooza '11 and I could show you the Papers.

  4. #4
    Electrical Engineer KMdef9's Avatar
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    Custom Swirly Black
    2001 WS6 M6

    Quote Originally Posted by justinmc978 View Post
    maybe a tenth slower
    Stock vs. stock, I agree.

    Once you need to transfer more and more power to the rear, the vert loses some torque due to body twist.

  5. #5
    Junior Member
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    Collector Yellow
    2002 CETA Conv Auto

    my ceta put down 316 hp 347 torque

  6. #6
    Just me Y2KPewterSS's Avatar
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    Pewter metallic
    2000 Camaro SS

    My A4 2000 vert in stock form put down 310. They are a tad slower than a coupe in stock form.

  7. #7
    Member waldo's Avatar
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    Machine Silver
    05 Corvette

    I had a 02 WS6 vert, stock it ran 13.5, I added a SLP lid, 3600 stall and a exhaust cut-out and got 12.9

    never put it on a dyno, hope this helps....it was an A4.

  8. #8
    Moderator Firebirdjones's Avatar
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    My 02 SS vert with a stall and headers went 12.76 at 107 mph.

    And for the record, It only weighs 60 more lbs. than my 00 SS T-top. Not even enough to make a difference at the track.

  9. #9
    Member Dave-TransAm's Avatar
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    Red
    1997 Firebird M5

    I've heard that with every extra 100 pounds added, it feels like you have lost about 5 horsepower per 100 pounds. Not too significant but before I run at the track I make sure that nothing I don't need isnt in the car. Haha.

  10. #10
    Moderator Firebirdjones's Avatar
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    Ya the rule of thumb is every 100 lbs. is worth one tenth. That's just a generalization or a guideline.
    The 60 lbs. difference in our 4th gens (vert/T-top) isn't enough to see the difference, since you are talking hundredths at that point (if you use the "rule of thumb"). That much time can vary easily just in driving style changes or track conditions. That's why I said it's not enough to worry about.

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