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when DOES vtec kick in?

Old Nov 30, 2005 | 09:13 PM
  #1  
stemyluv69's Avatar
stemyluv69
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From: West Linn OR
Default when DOES vtec kick in?

so i was reading this post.... http://www.team-integra.net/forum/di...urnPage=Search

and they are claiming 4400-4700. Now i drive a 97 gsr, and when i floor it in 4th gear (so i can hear the rpm's clearer and slower) i can hear a change in sound at 4700 and then vtec @ 6k (on the dot). Someone told me that the butterfly opens at 4700 (in the TB?)
Anyways, what is the stock vtec crossover/engagement? And what is the butterfly/when does it open (Besides full throttle) lol

Thanks
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Old Nov 30, 2005 | 09:18 PM
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The noise you are hearing is the IABs opening up. They open up at around 5700 rpms at any throttle position besides 0%.
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Old Nov 30, 2005 | 09:34 PM
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The cams switch to the VTEC lobes at 4400rpm.
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