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high mileage power loss????

This is a discussion on high mileage power loss???? within the Firebird / WS6 forums, part of the Vehicle Specific category; me and a guy were talkin at the track the other day about how much power was lost on high ...

  1. #1
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    1999 Trans Am

    high mileage power loss????

    me and a guy were talkin at the track the other day about how much power was lost on high mileage ls1's so i was wondering if anybody knew or possibly had some dyno numbers of a high mileage ls1

  2. #2
    Firebird Encyclopedia 9T8W66's Avatar
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    Navy Blue Metallic
    `98 Formula M6 HdTp

    I dynoed my Car last Spring at 109,000 miles. Mods are SLP Lid, FRA & EGR Free mods, SOTL Flowmaster Catback and an Original Clutch
    Numbers are from a Dynapack Dyno
    300 RWHP @ 5300 rpm
    322 RWTQ @ 4200 rpm
    I realize these numbers are on the low side but the engine is tired.
    I am the original owner and the car has felt stronger in the past but over the last 30k or so has softened up a bit. A new set of valvesprings would probably go a long way towards bringing back lost power. But why change valvsprings with out changing the camshaft as well !
    Craig
    Semi Retired Street Racer
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    Gone but not forgoten
    NBM `98 Formula M6 HdTp
    1 of 1 Build Date 3/12/98

  3. #3
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    not real high miles, but i have 78,000 and make good power

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    Member stanger88's Avatar
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    Black on black.
    2001 WS6 M6 (stock)

    Man, I started a thread on LS1tech.com JUST LIKE THIS! Here ya go...

    http://ls1tech.com/forums/showthread.php?t=659775

  5. #5
    Member kams95ss's Avatar
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    I ran a 13.30 with 112,000

  6. #6
    I don't sell out! blackSS01's Avatar
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    Obviously shit is going to wear out, but if you maintain your motor and other aspects, your car is going to make power long in life. I have heard of 350,000 mile LS1's making good power with mods. Just my experience though
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  7. #7
    !!!!!!!!!!!!!!!!!!!!!!!!! ATCharming's Avatar
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    Quote Originally Posted by blackSS01 View Post
    Obviously shit is going to wear out, but if you maintain your motor and other aspects, your car is going to make power long in life. I have heard of 350,000 mile LS1's making good power with mods. Just my experience though
    thats alot of miles.

    wow,

  8. #8
    someday joejenkinsglass's Avatar
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    Quote Originally Posted by blackSS01 View Post
    Obviously shit is going to wear out, but if you maintain your motor and other aspects, your car is going to make power long in life. I have heard of 350,000 mile LS1's making good power with mods. Just my experience though
    350xxx camaro/firebird im sure thats a rattle trap really would like to see/hear that car

  9. #9
    Member mikeaford's Avatar
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    01 Trans Am

    127K miles

    I have now 130,xxx miles on mine 01 LS1 small cam minor stock head work dynoed at 350 RWHP. Not bad I am experiencing a rattle from the passenger side not a lose heat shield and I have tapped the cataluytic convertoer lightly with a rubber mallet nothing there??? I'm still looking there the original cats so I'm thinking maybe it's starting to clog - I've read somethings where that might cause it only happening in the 1800 to 2200 RPM range? But still going like a champ!

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