2.0L CVT Lag on 2.0 EX No Turbo

  1. yhceeM

    yhceeM New Member

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    So I’ve been loving this car purchased it in October at 6,800 miles and it’s alread at around 13,600 now. I’ve noticed this about the first week in of having the car and I thought it was me just pressing the gas weird but that’s not the problem here. There’s a major problem with the CVT whenever you brake decently hard and start accelerating again or when you’re coming from a complete stop and you have to press the gas harder than usual and the car takes a moment and let’s the gas peddle just sink in but there is no sort of acceleration for about 2 second then the car just jerks forward and jumps rpms. It honestly makes me feel very unsafe because I drive this car all the time. I honestly feel like just returning the car because all the forums I’ve read no one has had any sort of luck with dealing with the dealerships and they just tell them that the car is working perfectly fine. Also, this happens on both econ and regular drive mode.
     
  2. gtman

    gtman Senior Member

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    I started a thread about this that turned into like a 15 page topic a while back. I have to deal with turbo lag and CVT lag. Here's a perfect example of when it happens and why it's scary:

    You're stopped at a major intersection and need to make a left hand turn into traffic. Traffic is heavy. You see an opening and punch the throttle and nothing happens for a second. It makes moves into traffic very dicey.

    One thing that will help is putting the transmission into "S" instead of D around town. Putting it into Econ actually will reduce throttle response. I agree with you though. It's an aspect of the CVT that needs refinement.

    My car is much better since I've been tuned
     
  3. OP
    yhceeM

    yhceeM New Member

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    Oh I’ve experienced that turning scenario several times. Needless to say my cheeks clench up every time I have to go through it. I’ve put 7000 miles on it in 2 and a half months and it’s happened more than it ever should. I deliver food and I’ve heard that driving on S isn’t good at all for the transmission or the engine itself because the RPMs are constantly high.
     
  4. gtman

    gtman Senior Member

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    S won't hurt the transmission but the higher revs will lower MPG's for sure.
     
  5. OP
    yhceeM

    yhceeM New Member

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    I’ll give it a try, thanks.
     
  6. jred721

    jred721 Senior Member

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    Yeah, thats the drawback of having a completely electronic throttle system combined with a CVT. I rarely see this mentioned on the forums but our cars use a drive by wire throttle system which means there is no real physical linkage between the throttle and the car, and all pushing the accelerator does is send an electronic signal to the car. Combine that with a CVT and sometimes you'll experience what you described. Ever since tuning though and increasing the throttle response to level 2, its virtually been eliminated.
     
  7. Aurelleah

    Aurelleah Senior Member

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    When you slam on the brakes your torque converter unlocks itself. You can feel this when braking normally too, around 10-15kmh or so you'll feel a change in how the forward momentum feels... Hard to explain but it's the torque converter freeing up. When you start accelerating your engine needs to get that fluid turning so it takes a small amount of time to get going, bit torque converters multiply torque at low speeds too, so when it kicks in it jerks a bit when the multiplication happens. Using S mode reduces the lag because faster RPMs spin the fluid faster. Then once you get going and get momentum your TqCon locks up again giving you direct drive again.

    The turbo engines have more of this effect cause their design has peak torque at 1500ish rpm, so the slower turning motors take longer to get the fluid velocity up (but obviously work faster once the torque converter gets going) whereas the NA engine accelerates normally at 2000-2500 so less of the CVT lag is felt as the converter locks up quicker
     
  8. 945T

    945T Member

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    This is pretty normal unfortunately. I believe a part of it is for smooth operation, same reason you can't exactly neutral drop the transmission. Turning off econ will help as will using sport mode around town.
    On my Si, it's hard to get a really smooth quick start with the manual because it will cut power a little if it detects slippage, so the car bogs down and you look like a noob to manual transmissions. I will often turn off the traction control just to get a clean start at the lights.
    The hill hold feature is another good example of the nannies interfering with the car.
     
  9. DarkLight

    DarkLight Senior Member

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  10. a c i d.f l y

    a c i d.f l y Senior Member

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    With a tune, there is nearly zero CVT lag on the 2.0. The stage 2 accelerator response added a weird delay with a heavy foot (traction control doing its thing), but the base tune it just goes when the accelerator is pressed.

    Using S will not harm your vehicle, it will just run higher revs which chews up gas. I regularly pop into S even with a tune for the engine braking.
     
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  11. scallywag502

    scallywag502 Member

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    So you've used this controller along with ktuner?
    My initial thought was that it's just simply mimicking the throttle level, so when you've got your foot a quarter into the throttle, it registers as full throttle. This in my mind wouldn't help since if you floor the throttle from a stop to get a good take off, the response is very lagged and "rubber bandy". I'd love to do away with this and hopefully this controller does the trick. Please advise :)
     
  12. Sitio23

    Sitio23 Senior Member

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    I have had this problem as well and need to buy a tuner for this exact same reason.
     
  13. DarkLight

    DarkLight Senior Member

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    Read what the CTR guys are saying about the Remus Responder. The Apexi is doing the same thing, making the response itself faster, irrespective of the amount requested. It will certainly do what you are describing though, which are the ramp settings.

    It’s absolutely not necessary if you have a Ktuner, but it will give the feel and responsiveness of a well-tuned mechanical throttle, which is what I wanted.
     
  14. scallywag502

    scallywag502 Member

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    Thanks a lot for your advice!
     
  15. scallywag502

    scallywag502 Member

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    Forgot to ask: How is the responsiveness on take-off? That's what i'd like to improve most.
     
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