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Just came back from the DYNO!!!!

This is a discussion on Just came back from the DYNO!!!! within the Dyno Information forums, part of the Racing Forums category; no, the sensors after the cats only throw the codes if the cats aren't there. the simulators trick the comp ...

  1. #21
    Member adham's Avatar
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    no, the sensors after the cats only throw the codes if the cats aren't there.
    the simulators trick the comp so that it thinks u still have the cats
    therefore, removing the SES light

  2. #22
    Senior Member Danger731's Avatar
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    I figured headers would have given you more. How bout a tune ?
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  3. #23
    Member adham's Avatar
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    i dunno....the tune is kinda expensive at 450 and its not gonna give but like 15-20hp at the most
    i dont think its worth it
    i have bad O2 sensors so they might rob me of hp by throwing off the computer????

  4. #24
    Member Capster78's Avatar
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    Quote Originally Posted by adham
    ohhhhh..... i see
    does it get weaker in the 1500-2900 rpm range since it will not drop untill 3000rpm???

    Kinda.. but it gets up to 3000rpm's in a hurry because the converter slips all the way to 3000rpms and then locks. Between 1500-3000 rpms the converter is sliping so that the drivetrain just spins without much resistance untill the converter locks.

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    with your mods a tune will put you around 320-325 im sure of

  6. #26
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    Quote Originally Posted by Capster78
    Kinda.. but it gets up to 3000rpm's in a hurry because the converter slips all the way to 3000rpms and then locks. Between 1500-3000 rpms the converter is sliping so that the drivetrain just spins without much resistance untill the converter locks.
    The converter doesn't lock @ WOT.
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  7. #27
    Member Capster78's Avatar
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    Quote Originally Posted by Ed Blown Vert
    The converter doesn't lock @ WOT.
    Okay, maybe lock was not the best word.. It slips less lol.. there.. ya happy.

  8. #28
    Blown, Stroked, & Sprayed

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    Just making sure users are getting the correct info.

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    Member Capster78's Avatar
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    Quote Originally Posted by Ed Blown Vert
    Just making sure users are getting the correct info.
    No its cool, your right.

  10. #30
    Member adham's Avatar
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    ok...if it matters,
    my air/fuel ratio is in the upper 10's
    how is this affecting anything?

  11. #31
    Blown, Stroked, & Sprayed

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    That is going to kill your HP. Lean that sucker out.

  12. #32
    Member adham's Avatar
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    is it supposed to be around 12?
    how do u make it lean?
    how much horse will i gain??

  13. #33
    Registered Player brad8266's Avatar
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    Quote Originally Posted by adham
    is it supposed to be around 12?
    how do u make it lean?
    how much horse will i gain??
    For your mods I would probably shoot for AF of 13-13.5 at WOT. You lean it by first replacing the oxygen sensors and if it is still rich, you may need a tune. You may want to get some new plug wires if you have original wires since you have high mileage.

  14. #34
    Member adham's Avatar
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    so that means my o2 sensors are bad?
    thats why my air/fuel ratioi is in the high 10's?
    i have new plugs and wires

  15. #35
    Jesus died to save you! Killer_bluebird's Avatar
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    I think it is a bit low too. I've never heard of the "DYNO DYNAMICS DYNAMOMETER" But my wife's 00 Z28 A4 with nothing but a K&N filter put down 292 on a Dynojet. Here is the graph.

    With your intake and exhaust mods you should have gained 30 or so rwhp over stock. If that dyno is similar to the Mustang dyno then it would produce lower number but I think you should still be over 300rwhp. My .02
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  16. #36
    Jesus died to save you! Killer_bluebird's Avatar
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    Quote Originally Posted by adham
    so that means my o2 sensors are bad?
    thats why my air/fuel ratioi is in the high 10's?
    i have new plugs and wires
    They could be bad or just plain cloged up, Also when you install headers in our cars the computer tends to richen up the A/F mixtures.

    When I did the exhaust on my car I was surprised that the A/F was dead on at 13. I did not installed headers though, but put an ORY and installed a Dynomouth. I think the fact that I De-Screened my maft might have helped. As people have reported lean conditions when de-screening the maft. However because many cars have reacted differently to that, I would not recomend it for your car. Like brad8266 said change the front o2 sensors and reset the computer, If that doesn't help get it tuned. Keep in mind that most dynotunes are going to run you about $400-$500.

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