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Thread: Please Explain WOT VVT Values

  1. #21
    Advanced Tuner WS6HUMMER's Avatar
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    Quote Originally Posted by SultanHassanMasTuning View Post
    all you can technically do it exhaust advance/retard thats it.

    i have done testing on both 5.7 and 6.4 with no gains
    Thanks, this is what I've been dying to know. About to take on my first cammed Hemi so I'm sure this table will come into play then.
    99 T/A WS6, original LS1 turbo

  2. #22
    Senior Tuner Higgs Boson's Avatar
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    Quote Originally Posted by SultanHassanMasTuning View Post
    all you can technically do it exhaust advance/retard thats it.

    i have done testing on both 5.7 and 6.4 with no gains
    How about dohc pentastars?

  3. #23
    Senior Tuner SultanHassanMasTuning's Avatar
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    ^never touched those engines
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  4. #24
    Advanced Tuner WS6HUMMER's Avatar
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    Quote Originally Posted by Higgs Boson View Post
    How about dohc pentastars?
    Now I have heard those do respond well to changes in these areas.
    99 T/A WS6, original LS1 turbo

  5. #25
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    I've swept the cams on hellcats and 6.4's with little to no gains. Have not tried a 5.7 but I assume it is similar.

  6. #26
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    The WOT settings are on the money for an NA.
    If S/C, they can use some tweaking.
    The PT settings however are purposely lame for emissions.
    Bringing these closer to WOT settings will liven the engine up lots and go a ways to
    eliminating the slow and then GO throttle response as you lean on the pedal.

  7. #27
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    Quote Originally Posted by Hemituna View Post
    The WOT settings are on the money for an NA.
    If S/C, they can use some tweaking.
    The PT settings however are purposely lame for emissions.
    Bringing these closer to WOT settings will liven the engine up lots and go a ways to
    eliminating the slow and then GO throttle response as you lean on the pedal.
    Interesting. I'll have to play around with some of this. Thanks for the insight!

  8. #28
    Attachment 64814

    So I'm guessing If I smooth out my WOT cam profiles to the average WOT settings it should help with the midrange dip?

  9. #29
    Attachment 64815
    If I keep the cam within the Base and Max centerlines would I be safe to prevent PV issues?

  10. #30
    Senior Tuner Higgs Boson's Avatar
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    Quote Originally Posted by brr View Post
    Attachment 64815
    If I keep the cam within the Base and Max centerlines would I be safe to prevent PV issues?
    I have been to both sides on my wrangler without issue so as long as your cams are stock I would say yes, that is the safe zone.

  11. #31
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    Quote Originally Posted by Hemituna View Post
    The WOT settings are on the money for an NA.
    If S/C, they can use some tweaking.
    The PT settings however are purposely lame for emissions.
    Bringing these closer to WOT settings will liven the engine up lots and go a ways to
    eliminating the slow and then GO throttle response as you lean on the pedal.
    How can I get the pt settings closer to the wot numbers? On my tune the pt table is 3D with 100? across the board. Would I take the ramp from the wot table and spread it across the x axis.... While adjusting the Y axis for the aircharge? As in using the WoT x axis at .08grams but making it milder... While in the .70grams x axis making it the same as the WOT table.

  12. #32
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    Screenshot (1).png

    This is how I am understanding the PT cam setting. Am I way off base or somewhere close to where I should be?

  13. #33
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    Quote Originally Posted by SultanHassanMasTuning View Post
    ^ no power gains, change your cam to a after market and then you will see some gains
    For the NA V8's with stock cams I can confirm that there are no gains to be had by moving the cam at WOT. We have tried this on many 5.7's and 6.4's
    For aftermarket cams in the NA V8's there are some performance gains to be had by modifying the WOT cam table.
    For aftermarket cams in the forced induction V8's there are significant gains in modifying the WOT cam table (unless of course a locker kit is used).
    When I say cam table I mean the exhaust WOT table. As previously stated there is no sense in changing both tables since there is only one cam.
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  14. #34
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    Quote Originally Posted by [email protected] View Post
    For the NA V8's with stock cams I can confirm that there are no gains to be had by moving the cam at WOT. We have tried this on many 5.7's and 6.4's.
    Interesting, The Tuning School recently posted some WOT gain on a stock 6.4L but did not mention what they changed in the VVT tables. Any ideas what they did?

    https://thetuningschool.com/blogs/news/vvt-in-123

  15. #35
    Tuner in Training guru1oftal's Avatar
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    If I remember correctly the intake was set at 109 degrees until around 4,000 rpm at which point it transitioned to 112 degrees.

  16. #36
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    Quote Originally Posted by guru1oftal View Post
    If I remember correctly the intake was set at 109 degrees until around 4,000 rpm at which point it transitioned to 112 degrees.
    On page 108 in the general dodge tuning handbook that is essentially what they did for the 2015 5.7 charger, but the dyno graph in their blog is for a 6.4. I don't think they would use the same values on the 6.4?

  17. #37
    Quote Originally Posted by 11challenger View Post
    Screenshot (1).png

    This is how I am understanding the PT cam setting. Am I way off base or somewhere close to where I should be?
    have same question here,
    have you found answer yet ?

  18. #38
    if i do like photos here, its better for performance and safe ?
    Attachment 95153Attachment 95154

    @Hemituna @Higgs Boson appreciate your feedback guys

  19. #39
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    You cant crash the valves, it is physically impossible in a stock engine.
    Do try the changes you have made, but it will drive worse than std....well now you will know to maybe try another direction
    Read up on (google) cam timing and LC numbers.
    Then you will get an idea of what most engines like...the pentastar is like most engines hint, hint.
    You will see the that the stock numbers have waaaaay tooooo much overlap, but that is for an egr effect (emissions) not performance or even economy.

    Quote Originally Posted by RedShark_JK View Post
    if i do like photos here, its better for performance and safe ?
    Attachment 95153Attachment 95154

    @Hemituna @Higgs Boson appreciate your feedback guys

  20. #40
    Quote Originally Posted by Hemituna View Post
    You cant crash the valves, it is physically impossible in a stock engine.
    Do try the changes you have made, but it will drive worse than std....well now you will know to maybe try another direction
    Read up on (google) cam timing and LC numbers.
    Then you will get an idea of what most engines like...the pentastar is like most engines hint, hint.
    You will see the that the stock numbers have waaaaay tooooo much overlap, but that is for an egr effect (emissions) not performance or even economy.
    good to know that valves cant hit pistons, thanks
    i have read in many posts your comment about the overlap and its from factory for EGR , but its not yet clear for me how to calculate the overlap and maybe then i will be able to reduce it
    will be great if you can point a direction