Giving a little thought on the Ktuner No Lift Shifting (Full throttle shift) on 10th Gen Si

  1. Stanim

    Stanim Member

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    Hey Si Enthusiasts,
    I purchased the Ktuner for my 10th gen Si some time ago and I want to try out the Full Throttle Shift recently. Here is some of my thought how much RPM to set the rev limiter to if you want a smoother shift.

    I am able to calculate the maximum speed for each gear (assuming redlining at 6,500 rpm) based on driving on 3rd gear @ 40mph and rev is very close to 3,000 and using the gear ratio. See the calculated results below.

    Gear Speed (MPH) Engine RPM
    1 32.4 6,500
    2 32.4 3,714
    2 56.7 6,500
    3 56.7 4,250
    3 86.7 6,500
    4 86.7 4,875
    4 115.6 6,500


    From above chart, if you want to do full throttle shift ( by redlining). 1st to 2nd the rev dropped to 3,714. 2nd to 3rd dropped to 4,250, and 3rd to fourth dropped to 4,875. So probably the best rev limiter is to bet set around 4,300 to around 4,400. My current set up is around 4,800 (not 100% smooth when NLS) and i want to give the new setting a try to see the difference.
     
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  2. charleswrivers

    charleswrivers Senior Member

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    Looking forward to an update at your new setting. I just did my first flash yesterday and haven't messed w/the NLS yet.
     
  3. OP
    Stanim

    Stanim Member

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    Haha. Is it the Ktuner or Hondata reflash?
     
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  4. charleswrivers

    charleswrivers Senior Member

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    It's a Ktuner. I did a 19/21 dual starter map on my SI to start off. I looked at the NLS for awhile but didn't do anything with it as I lacked the exact info you were talking about.
     
  5. OP
    Stanim

    Stanim Member

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    Nice Purchase! Seems like i posted the thread just in time :)
     
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  6. charleswrivers

    charleswrivers Senior Member

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    Yep. I guessed between 4-5k RPM but I figured I'd lurk and see if there was a good point that had already been hammered out. I tried the first level of aggressive presets and am very happy thus far, though I am going to take away the medium level throttle padding and see if that helps w/the rev hang. I checked to eliminate it and it *is* better... but I'd like to see if it could be a smidge better while staying smooth.

    Between a few more pounds of boost, all the stuff to help the throttle response and the cold days were having here in GA (about 30F right now) the car is feeling great.
     
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  7. francomakou

    francomakou Senior Member

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    The best rpm limit would be 4000 rpm from 2nd to 3rd
     
  8. BoostedDreams

    BoostedDreams Senior Member

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    Can you elaborate on this? Are you saying you would be "no lift shifting" at a mere 4,000rpm? Wouldn't that cause the car to fall flat on its face the next gear? Why would you not have it set close to redline at a minimum of 6,000?
    I am running a car tonight and was reading about this and I must be misunderstanding it.
     
  9. francomakou

    francomakou Senior Member

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    My bad.. 5000 is the best number

    all it does is cuts off the overshooting
     
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  10. BoostedDreams

    BoostedDreams Senior Member

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    So I should set the cut off to 5000 and i can shift at redline full throttle?
     
  11. francomakou

    francomakou Senior Member

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    Not fuel cutoff.

    Just set the full throttle shift to 5000
     
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  12. BoostedDreams

    BoostedDreams Senior Member

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    That’s what I meant thanks
     
  13. joecat66

    joecat66 Member

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    i've read the best acceleration times for the si occur when shifted at 5,500rpm....i believe it was when tested by motor trend
     
  14. BoostedDreams

    BoostedDreams Senior Member

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    Maybe on a bone stock one.
     
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