2.4L VVT ECOTEC Dyno Graph - Page 3 - Pontiac Solstice Forum
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post #31 of 39 (permalink) Old 06-09-2005, 01:50 PM Thread Starter
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I've updated my 2.4L VVT ECOTEC comparison chart.
I've also gone back and modified my old Miata, MSM, S2000, Solstice comparison charts. I've added the official flywheel dyno graph values to the charts. I left the speculated values there for comparison. Just remember the other cars dyno graphs are from wheel dynos, and not flywheel dyno like the officicial one.








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post #32 of 39 (permalink) Old 09-09-2005, 03:23 PM
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I would think the dip just some sort of internal resonance, as mentioned. My old HO Quad 4 had the same thing and it wasn't noticable.

Of course, having a passenger in the car at the track was a different story...
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post #33 of 39 (permalink) Old 09-10-2005, 08:34 PM
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Quote:
Originally Posted by Trabbic
Great I have been waiting for these...

That dip is NOT a cam switching over, VVT is not the same as VTEC. VVT is a rotating of the cam (a cam timing change happening on the fly). VTEC is two actual different cam lobs, one for low RPM < 5000rpm and one High Performance cam +5000RPM.

It is possible that the VVT is excentuating this drop, but my therory is that it is related to effecency in the valvetrain and air induction system (airbox, throttle body, etc...)
Is VVT more advanced than VTEC?
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post #34 of 39 (permalink) Old 09-11-2005, 01:47 PM
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Quote:
Originally Posted by TOY4TWO
Is VVT more advanced than VTEC?
They're two different things, vtec is like having two different set of cams while vvt is like having a variable cam gear that adjusts on the fly.
My vote goes to vtec, not sure if its more advanced but a higher flowing cam will make more power then adjusting a cam when it should open.

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post #35 of 39 (permalink) Old 09-11-2005, 02:48 PM
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Quote:
Originally Posted by shabby
vtec is like having two different set of cams .
Not like...Vtec is two cam profiles. One for low RPM one for high RPM.

VVT is really done more for emissions than HP. It can prevent some loss of HP in the Mid-range compared to a non-VVT car.

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post #36 of 39 (permalink) Old 09-12-2005, 06:43 PM
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Originally Posted by LBJay
Not like...Vtec is two cam profiles. One for low RPM one for high RPM.

VVT is really done more for emissions than HP. It can prevent some loss of HP in the Mid-range compared to a non-VVT car.
Ya thats kinda what i meant. A torquey/emission friendly cam for low rpm and a high lift/long duration/screw emissions for top end. This really should be in every single car out there, its really an amazing feature... other then boost of course

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post #37 of 39 (permalink) Old 09-12-2005, 06:59 PM
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That's a really cool idea, wonder if both could be combined?

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post #38 of 39 (permalink) Old 09-12-2005, 07:49 PM
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Quote:
Originally Posted by Adrenaline
That's a really cool idea, wonder if both could be combined?
Isn't that kind of what i-VTEC does? Not too up on my japanese tech, so there's a good chance I'm wrong...

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post #39 of 39 (permalink) Old 09-12-2005, 07:50 PM
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Yes, Toyota VVTL-i and Porsche Variocam Plus.


http://www.autozine.org/technical_sc...gine/vvt_2.htm

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