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vtec...two power bans?

Discussion in 'General Tech and Maintenance' started by indeskater, Jul 22, 2003.

  1. indeskater

    indeskater Member

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    i bought a 95 Gsr two weeks ago. i have installed a cold air intake, exaust, and a vtec light. The vtec light illuminates at about 4900 rpm at full throttle, where a very subtle sound difference occures, also a little bit harder pull. Then at 6000 rpm the vtec picks up again, with a reduculous sound difference, and a lot harder pull. My friend put a vtec light just like mine in his 2000 civic si. When his light illuminates it has the hard pull and more intense, abrubt sound difference at 5000 rpm, as mine has at 6000 rpm, but the civic never has a second powerban, the civic just holds the "new tone" until redline.

    My Qustion:
    Should my vtec be at full force when it first kicks on?
    Is my vtec just not comeing on until 6000 rpm?
    Does the Gsr vtec work exactly like the Civic Si?
    Thanks for your help.
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    the slight sound difference you hear is the secondary intake runners opening up
     
  3. 12secondCRX

    12secondCRX Senior Member

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    The light is coming on when vtec starts but it's not engage in either car till between 5600-5800rpm if stock ECU. (As far as I know but might be wrong)
     
  4. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    hondas do not have "levels" of VTEC its either on or its off
     
  5. 12secondCRX

    12secondCRX Senior Member

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    Okay but doesn't vtec engage around 5600-5800 stock normally then?
     
  6. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    its different on each type of VTEC engine ... not sure on the stock points
     
  7. Dman1100

    Dman1100 Senior Member

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    some do have levels only, a couple though
     
  8. hcivic.com

    hcivic.com Senior Member

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    no they dont!
    And Dont try to say i-vtec doea because it dosn't


    i-VTEC

    In addition to controlling lift and duration, like other VTEC systems, the "intelligent" i-VTECâ„¢system uses Variable Timing Control (VTC) to adjust "camshaft phasing." By varying oil pressure, VTC can continuously vary intake timing relative to the engine's exhaust timing. The result of i-VTEC is improved response and enhanced performance at low engine speeds and efficiency across a broad power band.
     
  9. Dman1100

    Dman1100 Senior Member

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    it's called 3-stage vtec. its in an itr(i think) and some older economy motor
     
  10. SixtySecondAssassin

    SixtySecondAssassin Senior Member

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    i thought the vtec-e and the s2000 was 3 stage
     
  11. Dman1100

    Dman1100 Senior Member

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    Damn it i fucked up you're right it's the s2k
     
  12. SixtySecondAssassin

    SixtySecondAssassin Senior Member

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  13. h82w8

    h82w8 Senior Member

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    If I am not mistaken, the three stage VTEC is a VTEC engine with a second VTEC that is activated when the vehicle gets to highway speed. instead of the change resulting in another powerband it switches to super economy mode.
     
  14. Dman1100

    Dman1100 Senior Member

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    could be i haven't read much about it i just know of it. but thinking of s2k's on the highway, i saw one with a flapping wing in tennessee a week or so ago and it flew past us and then about a half hour later we saw a cop fly by with his lights on and then like an hour later we saw the cop on the shoulder and the s2k in the trees. sucks for that guy
     
  15. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

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    the gsr engine (if stock) hits vtec at about 4400 rpm, but the secondaries are still closed, and at about 5800 rpm the secondaries open up
     
  16. JDMilan

    JDMilan Senior Member

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    your correct ^ about the GSR with crossover in the 4's and the butterflies opening in the 5's.


    Milan
     
  17. rudeludenotmeanthough

    rudeludenotmeanthough Senior Member

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    does someone have a 'how stuff works' about this???... im a little lost
     
  18. JDMilan

    JDMilan Senior Member

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    Not sure if this helps but in the oem GSR the vtec crossover is at 4400rpm so that is when vtec engages. Now at 5800rpm there are secondary butterflies (kind of like small extra tb's) that open up within the GSR intake manifold, that is why the manifold looks unique.


    Milan
     
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