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Only Made 399rwhp

This is a discussion on Only Made 399rwhp within the General Help forums, part of the LSx Technical Help Section category; Went to the dyno on Friday and I was lil' disappointed cause my car only made 399. I got LS6 ...

  1. #1
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    Angry Only Made 399rwhp

    Went to the dyno on Friday and I was lil' disappointed cause my car only made 399. I got LS6 Heads ported by MTI with the G1 Cam with all the upgraded valvetrain stuff. Hooker 1 7/8 LT headers with Hooker y-pipe. Slp Air Lid, LS6 Intake. I don't have a catback yet, all I got is a Hooker muffler with the factory pipe. My friends think 399 is great but, I was expecting a lil' more. Does anybody have any suggestions. Thanx

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    A4 or M6

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    Slow'er'Ass Mr. Luos's Avatar
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    Quote Originally Posted by juiced99ws6 View Post
    A4 or M6
    Agreed. This makes a difference concerning your numbers.


    Running stock pipes back there is limiting you a bit as well.
    Those headers are also too much for that motor. Probably lost some down low power with them.

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    pimp spookyz28's Avatar
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    Maybe you should open the up the heads more. I would go with 1.8 roller rockers if you don't all ready have them. what were the head's flow tested at?

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    I got an m6. Don't know how much they flowed, but its MTI's 2E LS6 Head package.

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    I have set of SLP headers, I did not use them again cause they bang up against everything. Should I use those again.

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    the smaller headers would give you a little more power down low as Mr Luos said. and with a full catback you would be over the 400 mark. do you have a 10 bolt or 12 bolt rear end.

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    Ebaaaaaaaaa Speedy_Gonzales's Avatar
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    i just wished i could complain about 399

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    Slower Than a 3rd Gen juiced99ws6's Avatar
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    ^^

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    Um, this may be a dumb question, but it says you have a '95 Camaro???

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    Senior Member slims00ls1z28's Avatar
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    Cut out. Since you know what it made I'm assuming your already tuned. Those numbers sound alright. Friend had similar set up and made 402 RWHP with just heads and that cam on a cut out. But he still had stock lid and filter so his problem is probably like yours one side flows other side kinks, add a cut out and you'll go over 400 for sure. Can ya run 1.8's with that cam? Stock gears or changed?

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    Member SSpdDmon's Avatar
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    I'd say that exhaust is screwing you up more than you'd think. 1 7/8 is too big for stock cubes. Not to mention the stock catback will choke you down too. I'd suggest getting some different headers (1 3/4) and a decent catback (or at least a cutout). Who did the tune? If it was a mail order, you may have 15~20hp left in it after straightening out the exhaust and tune.

  13. #13
    Visualize°Design°Create SSwt00SS's Avatar
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    sounds low to me. what are the specs of your G1 cam? also, what was your rwtq number?

    i definately agree with the others that your stock cat-back is hurting your #'s...

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    pewter
    2001 z28 lingenfelter 383

    ill take the 17/8ths!!!! .....would they hurt my tourqe any seeing i have a stroker motor already??? i mean if they were to say lose me 5 ft lbs of tourqe but gain me 5 hp id say there worth it over 1 3/4ths

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    pewter
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    Question

    Quote Originally Posted by blomeup647 View Post
    Went to the dyno on Friday and I was lil' disappointed cause my car only made 399. I got LS6 Heads ported by MTI with the G1 Cam with all the upgraded valvetrain stuff. Hooker 1 7/8 LT headers with Hooker y-pipe. Slp Air Lid, LS6 Intake. I don't have a catback yet, all I got is a Hooker muffler with the factory pipe. My friends think 399 is great but, I was expecting a lil' more. Does anybody have any suggestions. Thanx
    How much did all of the parts cause you? I ask because I plan to do the same setup. Heads, cam, intake and headers,come December.

  16. #16
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    Thank You all for your responses. I have 6 speed, yes the car is a 95 Chevy Camaro, but with an LS1. Everything is from an LS1 car. My torque was at 376. I am gonna get the Borla catback today and I am gonna port the throttle body.

  17. #17
    JUISSED Midnight02's Avatar
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    The catback and TB porting should get you over the 400 mark! I've been planning a similar setup on my car, so I'm glad to see it should get me around 400 rwhp!

  18. #18
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    I spent about $4500 with everything including Y-pipe and Headers.

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    Member SSpdDmon's Avatar
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    I know I said it once already, but you should have bought smaller 1 3/4 headers.

  20. #20
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    pewter
    99 Trans Am

    Question

    Did you do the install of the parts your self or got some one to do it for you? I asked because I would like to know how hard was it to do.I work on cars all the time but they are alot earlier ones and they don't have all the plugs and wires to worry about.Just thinking of tearing into my 99 TA makes me think twice about doing it myself.

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