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How much hp does a stock 2000 z28 really put out?

This is a discussion on How much hp does a stock 2000 z28 really put out? within the General Help forums, part of the LSx Technical Help Section category; I know all the stick numbers but i have heard of some people putting their stock cars on a dyno ...

  1. #1
    Member camaroluvr447's Avatar
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    Pewter
    2000 Pewter Z28 M6

    How much hp does a stock 2000 z28 really put out?

    I know all the stick numbers but i have heard of some people putting their stock cars on a dyno and getting much higher numbers. Is that true? I have also heard that The General has underrated the horsepower to make the vette look better... so how much power does a stock z28 have?

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

    brand new, they could put 320 to the wheels easy ls1 has about 350 at the flywheel

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    Slow'er'Ass Mr. Luos's Avatar
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    285-315 RWHP.

    Depends on the dyno, the weather, and the transmission.

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    Member Ls1_385hp_T/A's Avatar
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    The 310-320hp they advertise for the ls1 is actually the rwhp. Cars putting out at least 350hp stock

  5. #5
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    My 02 put down 306rwhp/323rwt as a stocker w/29,xxx miles on it here in Tempe, AZ on a warmish (~85) day.

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    like they said 280-320whp depending on dyno and tranny, of course you will get the guy who made 345whp stock at some shop that probably adjusted some settings to make there customer feel good lol.

  7. #7
    HottubChampion
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    Peuter
    2000 Z28

    my wifes 02 35th LE auto put down 305. HPTV put a stock LS1 on their engine dyno with just headers and no accessory drive and made 400hp at the flywheel.
    Last edited by HottubChampion00; 10-02-2009 at 07:24 AM.

  8. #8
    Member 01 SS Vert's Avatar
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    stock 98s I saw around 285-300 rwhp, 00+ I have seen mainly 300-315 stock....most of them anyway. As mentioned, a lot can make this number change.

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    coca cola RED
    02 Z28

    when i got mine it was bone stock it came out to 291 rwhp... i doubt dat a bone stock wud reach over 320+ rwhp

  10. #10
    HottubChampion
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    Only car I have seen make 320 stock was an 02 Firehawk M6.

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    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
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    Quote Originally Posted by vonskeezy707 View Post
    when i got mine it was bone stock it came out to 291 rwhp... i doubt dat a bone stock wud reach over 320+ rwhp
    Are you trying to discredit yourself?

    Quote Originally Posted by vonskeezy707 View Post
    When I got mine it was bone stock and it came out to 291 rwhp... I doubt that a bone stock would reach over 320+ rwhp
    There...much better.

  12. #12
    Internet Tough Guy Fury_786's Avatar
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    Sinister, SixGun
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    Quote Originally Posted by Spikito View Post
    Are you trying to discredit yourself?



    There...much better.
    much better

  13. #13
    Senior Member karpetcm's Avatar
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    Ive seen a stock 01 WS6 M6 put down 331 RWHP on a dynopack. Mine as it sits with a few bolt ons pulls about 336rwhp.

  14. #14
    Member Ls1_385hp_T/A's Avatar
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    just depends

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    Member fergyflyer's Avatar
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    My 01 A4 put 302 to the wheels stock.

    My 1st 02 put 318 to the wheels stock.

    My current 02 with catback, lid and Diablosprt Predator is at 328, never tested it stock though.

    Using 375 as flywheel hp and figuring 20 driveline loss it would be 300 at the wheels. 15% driveline loss equals 319 at the wheels. A good guess would be 375 flywheel hp give or take 10 hp.

  16. #16
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    way way too many variables to consider why the numbers would vary.

    Safe to say slightly less than the vettes rated 345 because our exhaust sucks more than theirs. so Hows 340.

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    Quote Originally Posted by 5abivt View Post
    way way too many variables to consider why the numbers would vary.

    Safe to say slightly less than the vettes rated 345 because our exhaust sucks more than theirs. so Hows 340.
    Who cares, its what you run. I have seen 330whp cars runs low 11s high 10s.

  18. #18
    Member 98Hardtop's Avatar
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    I see way to many 01 and 02 replies when we are dealing with an 00 which will make slightly less hp. I have seen an 00 A4 make 275 rwhp and a few others around 290-300 rwhp depending on the transmission.

    09 Vulcan 900 custom.
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    1998 Z/28 Hardtop A4 | Y2K wheels | SLP Lid | Magnaflow catback |cutout | Hotchkis LCA'S/PHB | BMR TA and D/S Loop| Tuned by Frost....300rwhp/308rwtq

    97 Cobra- bolt ons | full exhaust| 4.30's| suspension | SCT tune- sold!

  19. #19
    Member Ls1_385hp_T/A's Avatar
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    Quote Originally Posted by 98Hardtop View Post
    I see way to many 01 and 02 replies when we are dealing with an 00 which will make slightly less hp. I have seen an 00 A4 make 275 rwhp and a few others around 290-300 rwhp depending on the transmission.
    the beat up ones probably make the 275 rwhp

  20. #20
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by Zinergy View Post
    Who cares, its what you run. I have seen 330whp cars runs low 11s high 10s.
    THIS...

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