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Variable Valve Timing Question

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Old 06-17-2009, 07:51 PM
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Variable Valve Timing Question

Whats up guys. I was wondering if the VQ35 in the pre-revup coupes has VVT. If so does it incorporate lift and is it on the intake cams, exhaust cams or both?

Thanks in advance!
 
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Old 06-18-2009, 06:59 AM
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Yes on the intake cams only.
 
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Old 06-18-2009, 01:56 PM
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Thanks! what RPM does it engage?
 
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Old 06-18-2009, 04:05 PM
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Sorry as i have no clue.
 
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Old 06-19-2009, 08:26 AM
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IIRC, It is variable to 4k.
 
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Old 06-19-2009, 09:26 AM
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Originally Posted by EvanP246
Thanks! what RPM does it engage?
There's some sort of major cam change that occurs around 2800-3000rpms. That's where the power really ramps up in my car.
 
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Old 06-19-2009, 02:29 PM
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Thanks again guys. When I hit around the 2800-3000 in my car i feel the extra power too but the engine note seems to change up in high rpm from 5000 to redline.

Anyway i wish we could have VVEL on our VQ35s apparently you really get a kick when they switch to high cam.
 
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Old 06-19-2009, 02:56 PM
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ya its definitely in the 3250 range bc when i log, the AFR always gets funny around there.
 
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Old 06-19-2009, 07:41 PM
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The cams are variable 0-38 degree advance over the entire rpm band and can be reprogrammed via stock ECU reflash or using a standalone cam controller like the Haltech. Lift is fixed based on cam specs.

As I recall, the stock ECU intake cam timing map has 0 degrees advance (full retard) at idle, ramps up to max advance in the midrange and then tapers back towards full retard at redline.
 
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