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3.4L seems slow after 3000rpm

Discussion in 'Performance and Tuning' started by mattleegee, Aug 17, 2010.

  1. Aug 17, 2010 at 9:28 PM
    #1
    mattleegee

    mattleegee [OP] Well-Known Member

    Joined:
    Mar 21, 2010
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    #33672
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    Tacoma, WA
    Vehicle:
    04 350z
    Where to start?
    I shift at 3k or before because there is nothing after... more noise and no real go.. almost feels like a turbo motor that fell on its face

    I tried to find some dynos and found a few tid bits mentioning

    190hp@4800rpm
    220lbs.ft@3600

    Is this power loss/cutoff normal for the 3.4L?

    I was going to start with the fuel filter and MAF
    Plugs look new, already seafoamed a couple months ago
    Just screwed deck plate mod back in (didnt really drive the truck without it ever)

    My exhaust is not stock and i dont know what it is, not leaking/rusted though

    Any input?
    Where do you start losing power?

    Thank you much
     
  2. Aug 20, 2010 at 2:15 PM
    #2
    malander

    malander That's some tight butthole

    Joined:
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    max
    Missouri
    Vehicle:
    01 limited trd 4x4
    deck plate mod,jba cat back,bilstein 5100's,ome 883 springs, Allpro expos, allpro U-bolt flip kit, 10" Bilstien 5150 shocks, custom lower shock mounts
    hmm thats where i start gaining power or so it seems id keep the deck plate out for now if i were you but exhaust sounds like it would help at 3k rpms maybe clogged cat or something of the sort maybe someone else could chime in
     
  3. Aug 20, 2010 at 2:25 PM
    #3
    mattleegee

    mattleegee [OP] Well-Known Member

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    Tacoma, WA
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    04 350z
    I put the deck plate back in and it seems ok above 3k again

    Thanks for the input its something to look at.. im gonna try to reset the ECU and take out the deck plate again to see if it can adjust accordingly, but its a releif and weird that i got my power back with the plate back in
     
  4. Aug 20, 2010 at 2:34 PM
    #4
    malander

    malander That's some tight butthole

    Joined:
    May 6, 2010
    Member:
    #36656
    Messages:
    2,434
    Gender:
    Male
    First Name:
    max
    Missouri
    Vehicle:
    01 limited trd 4x4
    deck plate mod,jba cat back,bilstein 5100's,ome 883 springs, Allpro expos, allpro U-bolt flip kit, 10" Bilstien 5150 shocks, custom lower shock mounts
    yeah that does sound kind of funny maybe there is a problem with your injectors if more air isnt helping or something like that. if theres more air and less power it could be running lean i believe reading up on gadgets site about how at high rpms his supercharger would feather out and he replaced his injectors or something like that
     
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