Thread: Header install vibrations

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  1. #21 Re: Header install vibrations 
    GT Level Member willie14's Avatar
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    Have u tried a different gap on your sparkplugs? That seems like u pulled a ton of timing out to keep it down.
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  2. #22 Re: Header install vibrations 
    GT Level Member willie14's Avatar
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    I'd hate to have to jump back up a pulley size because I couldn't get the tune right with a smaller pulley, but I guess that's where the tuner pros gonna come in for me as this I gonna be my first 3800 build
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  3. #23 Re: Header install vibrations 
    GXP Level Member coolone's Avatar
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    Bigger pulley doesn't always equate to more HP... Smaller pulley no knock ++timing = ++HP
    : )
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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  4. #24 Re: Header install vibrations 
    Killa Bee Scottydoggs's Avatar
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    lets just say, your not running a smaller pulley with out more flow mods, or a ic, or e85.

    i got ported heads, 1.95 rockers, a fsic ported lim, and 42 lb injectors. it wont take much timing at 10 psi. but at 7 psi it will take 18 degrees wot.

    your best to buy a tuner, canned tunes dont always work so well for a top swap. they need tweaking to get right, then you can play the boost vs timing game. no tuner,,,,you'll never know what its capable of.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #25 Re: Header install vibrations 
    GT Level Member willie14's Avatar
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    I gotta buddy of mine who does it for a living who's going to tune my car as I modify it. Right now he's tuning a g8 so I'm pretty anxious to see what that and my car is capable of
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  6. #26 Re: Header install vibrations 
    Killa Bee Scottydoggs's Avatar
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    before the ic, i had a 3.4 on there, it was getting 6ยบ kr at part throttle with stock l67 timing. so i put the stock pulley on and then ran one degree less wot timing and it had no kr at that point.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  7. #27 Re: Header install vibrations 
    GT Level Member willie14's Avatar
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    But your losing engine performance by having to go back to that stock pulley tho right?
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  8. #28 Re: Header install vibrations 
    GXP Level Member Grimsin's Avatar
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    Still more compression then a l67.

    3.8l N/A POWA! :4'' HAI\L67 HVTB\HV3\ER Rockers\WP underdrive pulley\Headers\cat delete\91 octane overkill incar tune.3.69 gears, Trans go shift kit.
    My Car:http://www.grandprixforums.net/threa...2005-Impala-LS
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  9. #29 Re: Header install vibrations 
    I break things. WarStryker13's Avatar
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    with an N/A bottom end, an otherwise stock L67 or L32 will make ~5 more HP than a bone stock s/c engine, but KR is a much bigger issue and a top/bottom swap needs to have flow mods in order to be safe.

    04 GP GT2: Handling upgrades, go-slow parts, and an attitude. Totaled.
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  10. #30 Re: Header install vibrations 
    GT Level Member willie14's Avatar
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    I forgot he's got a L36 bottom end
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