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Old 01-05-2004, 21:11   #1 (permalink)
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VCT abilities

Is VCT similar or the same as Honda's version which gives a more agressive cam profile at a certain rev range? Would this allow for a fairly aggresive cam that would not usually be considered for street use to used and able to have decent low range power?
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Old 01-05-2004, 22:47   #2 (permalink)
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Re: VCT abilities

the VCT (from my limited understanding) simply changes the timing of the cam at the 3700rpm range (in the AU at least).

Stolen from another thread:
VCT - Variable Cam Timing. IIRC the Falcon Six's VCT setup retards the cam timing by 10 degrees after the engine revs exceed 4000rpm(is actually 3700rpm). From my understanding of it, what happens is that when the engine revs exceed 4000rpm, the engine retards the camshaft timing 10 degrees in relation to the crankshaft position, which allows a better higher RPM cylinder fill. Unfortunately, it also retards the exhaust timing, being the Falcon's head is still an SOHC design. This feature should be better when the Falcon comes out with a DOHC head.

I'm not sure about the actual retardation, I thought it was 13 degrees however the concept is correct.

So can you use a more agressive cam? Thats a good quetion which I would love to find out myself.
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Old 01-05-2004, 23:55   #3 (permalink)
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Re: VCT abilities

The cam changes all the time aparently in the ba. if you have an auto and roll the car forward slowly in drive apparently you can notice the timing change even at just above idle
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Old 01-05-2004, 23:59   #4 (permalink)
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Re: VCT abilities

Quote:
Originally Posted by redGhia
The cam changes all the time aparently in the ba. if you have an auto and roll the car forward slowly in drive apparently you can notice the timing change even at just above idle
I can notice it in my BA XR6 manual :)
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Old 01-06-2004, 00:04   #5 (permalink)
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Re: VCT abilities

Quote:
Originally Posted by CSV_LS1
Is VCT similar or the same as Honda's version which gives a more agressive cam profile at a certain rev range? Would this allow for a fairly aggresive cam that would not usually be considered for street use to used and able to have decent low range power?
I'm not sure about Honda's VTEC, however it is similar to Toyota's VVT-i used in the 1.3, 1.5, 1.8 Echo/Corolla's. That is the cams vary with throttle position/load/requirements. However it does not effect the cam lift which is what Toyota have in the VVTL-i (variable valve timing and lift) which is the 1.8L 4 cylinder in the Corolla Sportivo and the Celica (142kW out of 1.8L ain't bad)

VTEC my guess is something to similar to VVTL-i which is the best of both worlds, allowing timing of the cams/valves to adjust to performance/economy requirements and lift to ensure maximum engine breathing (all the benefits of a lumpy cam without the idle problems).
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Old 01-06-2004, 04:53   #6 (permalink)
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Re: VCT abilities

on the AU XR6VCT the cam is retarded a little at idle (the actual number escapes me, though i was reading about it just the other nite) then is advanced slightly from just off idle to about 3700, when it is retarded again.

im pretty sure its not load dependant, only revs.
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Old 01-06-2004, 05:06   #7 (permalink)
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Re: VCT abilities

My main question is about VCT on DOHC such as the I6 and possibly the boss engines.
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Old 01-06-2004, 05:44   #8 (permalink)
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Re: VCT abilities

Does the VCT engine pull hard when it hits 3700 like a Honda VTEC engine does? The VTEC system feels almost like a turbo at really low boost...
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Old 01-06-2004, 17:19   #9 (permalink)
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Re: VCT abilities

The Boss engines don't have VCT. The SOHC Barra 220 does though.
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Old 01-06-2004, 20:33   #10 (permalink)
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Re: VCT abilities

I mean for future bosses when they are updated.
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