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How much will a lid and a cut out boost my hp ?

This is a discussion on How much will a lid and a cut out boost my hp ? within the External Engine forums, part of the LSx Technical Help Section category; Would 25 hp be about right ?...

  1. #1
    Ebaaaaaaaaa Speedy_Gonzales's Avatar
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    How much will a lid and a cut out boost my hp ?

    Would 25 hp be about right ?

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    NY Representative basballny2's Avatar
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    10-12 rwhp

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    Member Z28LS1's Avatar
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    I'd say the lid will give you about 6 hp, and the cutout will give u about 8 or so over the stock muffler.. so to be safe, id say roughly around 15.. i was in this dilemma once, but i ended up getting headers with the cutout... i saved money since i knew i was going to get the headers anyway.. thats what id suggest

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    what would it be If you have lt headers then an ory and the lid and smooth bellows
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    Just me Y2KPewterSS's Avatar
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    15 RWHP range Randy
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    Ebaaaaaaaaa Speedy_Gonzales's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    15 RWHP range Randy

    how bout at the motor ? I am ole school, I like the bigger number makes ME feel better..............and what would be a good guesstimate at the flywheel total including what GM rated the 01-02 SS cars ?

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    NY Representative basballny2's Avatar
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    GM rated them at 325 at the crank .... so MAYBE being generous 345 at the crank after....id go more with 340 though

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    Ebaaaaaaaaa Speedy_Gonzales's Avatar
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    Quote Originally Posted by basballny2 View Post
    GM rated them at 325 at the crank .... so MAYBE being generous 345 at the crank after....id go more with 340 though
    but GM underated them around 30 hp

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    its about 345 flywheel stock for an '01 so i would say 360 flywheel hp after lid/cutout.

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    NY Representative basballny2's Avatar
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    put it on the dyno

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    Senior Member Danger731's Avatar
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    Ebaaaaaaaaa Speedy_Gonzales's Avatar
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    Quote Originally Posted by basballny2 View Post
    put it on the dyno

    would rather put the $$$ towards a pro tune

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    United States Marine Kamauxx's Avatar
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    Screw the dyno, put it on the track before and after the mods.

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    NY Representative basballny2's Avatar
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    Quote Originally Posted by Kamauxx View Post
    Screw the dyno, put it on the track before and after the mods.
    he wants to find out his hp....no better way than to dyno it

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    Ebaaaaaaaaa Speedy_Gonzales's Avatar
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    Quote Originally Posted by basballny2 View Post
    he wants to find out his hp....no better way than to dyno it

    true

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    Just me Y2KPewterSS's Avatar
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    Dyno #s equate to bragging rights, they don't equate to how fast a car really is.

    Track times equate to how fast a car really is.

    You can have 500 HP at the motor and still run 13s.

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    Just me Y2KPewterSS's Avatar
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    Quote Originally Posted by SpeedAddict38 View Post
    how bout at the motor ? I am ole school, I like the bigger number makes ME feel better..............and what would be a good guesstimate at the flywheel total including what GM rated the 01-02 SS cars ?
    I would say it would add 20 HP at the motor, but thats just a guess. I would tell people 350 HP from the motor and leave it at that. Might be more, might be less, but thats a safe round # to use and should be in the ballpark.

  18. #18
    NY Representative basballny2's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    Dyno #s equate to bragging rights, they don't equate to how fast a car really is.

    Track times equate to how fast a car really is.

    You can have 500 HP at the motor and still run 13s.
    i was just telling him to dyno it because he was wondering about HP numbers....ur 100% right though hp means shit at the track....but if he wants to get the most accurate way to get his hp he has to dyno it....we can guess all we want....not everything equates to wut it says it will

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by Y2KPewterSS View Post
    You can have 500 HP at the motor and still run 13s.
    Very true.
    I went 13.1 at 82MPH.

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    Quote Originally Posted by Mr. Luos View Post
    Very true.
    I went 13.1 at 82MPH.
    LOL!!! good one
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