CVT failure: Details inside

  1. Papayank

    Papayank Senior Member

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    Hmmm I ask because I noticed when flooring.....my car kinda jerk a little and go faster for example the rpm goes to 3k and then when it goes to 4k rpm its like a gear changing but it goes faster I don't know how to explain it
     
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    Coupe-R

    Coupe-R Senior Member

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    I see, yeah that is definitely not what I felt. That sounds like the regular simulated shifts the CVTs do.
     
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  3. xjoshuax89

    xjoshuax89 Senior Member

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    Cvt. Tuned at IMW by Derek Robinson and I've been using the full VSA off.

    Not sure if I am reading that chart right but close to max 390 wtq?

    Seems like issue of too much tq down low with waaay too much boost.
     
  4. gtman

    gtman Senior Member

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    That dyno plot was from his first tune I think. Coupe-R sent me his current tune settings and everything looked kind of "conservative", considering. Early spool on with factory part throttle turbo response and factory boost ramp. 24 psi above 5000 rpm only. Final boost at 24 as well.
     
  5. xjoshuax89

    xjoshuax89 Senior Member

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    Question is how much boost down low. And I dont think settings will show really how much tq is being generated down low. If its 20psi in 1st and 2nd "gear" we have our answer. Too much too early.
     
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    Coupe-R

    Coupe-R Senior Member

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    When I got that dyno plot, they said ignore the torque numbers as they weren’t being read right by the dyno due to being a CVT. They said at that time it was probably around 225-235lb-ft for torque.
     
  7. gtman

    gtman Senior Member

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    #22 gtman, Sep 2, 2019
    Last edited: Sep 2, 2019
    His tuner set BBG to 15 psi in 1st.

    Here are the boost targets I saw 2500-6500 rpm:

    2500 - 16
    2750 - 18
    3000 - 20
    3500 - 22
    4000 - 22
    4500 - 22
    5000 - 22
    5500 - 24
    6000 - 24
    6500 - 24
     
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  8. OP
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    Coupe-R

    Coupe-R Senior Member

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    As @gtman said, I sent him my tune file. I don’t have a dyno plot from my second tune as his dyno said I only made 160hp and 160lb-ft, he couldn’t get it to read the CVT right so I didn’t bother getting a printout of those dismal and obviously wrong values. My 1st gear BBG caps at 15psi, the rest are 21psi for “gears” 2-5. I’ve driven cars with higher power and torque than these Civic 1.5s make, I like to think my butt dyno is pretty good. Definitely in the 200-220hp range, and torque feels somewhere in the 220-240 range.
     
  9. xjoshuax89

    xjoshuax89 Senior Member

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    Hmmm that is certainly very interesting. Thanks for sharing!
     
  10. Papayank

    Papayank Senior Member

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    How long you have tune for?
     
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    Coupe-R

    Coupe-R Senior Member

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    About 1 year.
     
  12. mikey003

    mikey003 Senior Member

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    no they are not,

    your just not hearing about them all,
     
  13. dallasjhawk

    dallasjhawk Senior Member

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    Yeah because internet troll knows everything, get lost
     
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  14. 250GTCalifornia

    250GTCalifornia Senior Member

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    This is how detailed and forthcoming every one of these "blew my engine" posts should be. Thank you, Coupe-R.
     
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  15. julianzh

    julianzh Senior Member

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    Thanks for the thread. Very interesting to read until the tune hater appeared.
     
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