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Thread: Speaking of VCT angels

  1. #1
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    Speaking of VCT angels

    Putting VCT angles in perspective. The world of TIVCT was and is a game changer for performance and the environment. We can have a custom cams from taps of a key board and control the tail pipe gasses introduced to the OZone. The tuning of angles vs overlap ended the external EGR system we no longer see hanging of the side of the intake all rusty and messing with our custom headers... Over lap is EGR. Scavenging is EGR. The dead fuels, the absence of oxygen, NOX, all the other inert gasses left over from the combustion cycle. DEAD AIR useless for balanced tuned combustion GREAT for the OZone. No one using HPTuner or any other tuner is trying to save gas money or protect the OZONE. We want HORSE POWER. Speaking of stock angles, they are defiantly set by FORD for emissions. Now throwing BOOST to the cylinder, the cycle is not EGR,ing or scavenging its BLOWING THRU, wasting boost or better said controlling boost . We can control separation and even compression in theory.

    On a stock engine you may be able to see very small HP gains but mostly you are changing emissions. A stock TB intake... the engine will suck the same amount of air regardless BUT aftermarket intakes... will change the flow of air and has proven to increase HP. VCT tuning on stock is "picking fly shit out of pepper".

    Now throwing Boost at it VCT tuning is much more complex not only controlling emissions also controlling Boost, VE, air fuel ratios, ignition timing...

    So in theory controlling VCT overlap and opening and closing valve timing is doing a lot. LESS overlap should be more. It all depends on all the other factors of the compression stroke. If we decrease overlap more boost probably need to change the fuel and timing, toque management tables speed density tables... "more like cutting fat off a steak"!

    if your like me log data and make small changes and compare the results. "You can feel your car like no one else"
    Last edited by 18f1505.0roush; 06-09-2019 at 04:51 PM.

  2. #2
    Advanced Tuner
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    ...and then you woke up

  3. #3
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    what are your findings on the dyno or real world testings?

  4. #4
    Senior Tuner CCS86's Avatar
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    Quote Originally Posted by 18f1505.0roush View Post
    what are your findings on the dyno or real world testings?


    What are your dyno findings?

    I'm with you that VCT angles can make a big difference, but statements like "if your like me log data and make small changes and compare the results. "You can feel your car like no one else"", don't really mean anything.

  5. #5
    Senior Tuner mbray01's Avatar
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    If everything is calibrated properly, its unlikely cam changes are going to make that big of a difference that your going to feel from one pass to the next. Cam changes will make big differences in power, but not enough to feel. If you feel a difference in power from one cam angle to another, its either because your masking an issue somewhere else in the tune, or you went from a completely screwed up cam setting to an optimized setting
    Michael Bray
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