Thanks for the update. For me, it’s very subtle and I actually noticed it more in sport (compared to comfort) only when I give enough gas to push boost pressure to 10 but no downshift occurs. I also struggle with motion sickness so perhaps I’m more in tune (pun intended) with these subtle irregularities.
I did finally record a video of the judder happening in sport mode. Can’t get the car in until July 6th so will have to wait until then to see what they say.
I guess it’s hard to see but it’s most noticeable when I push the car just enough to induce boost but not a huge increase in RPMs. The boost gauge did climb to almost half. If I mash the petal, it will downshift and acceleration at higher rpms seems smooth.
The only time I saw the speedo "bounce up and down" was when it appears he was accelerating at the start of the video, let off briefly shortly after the video started (within the first second), then began accelerating again which the speedo pretty smoothly went up. There might have been a couple of times where the speedo didn't continue sweeping up smoothly but I wouldn't say it was anything drastic at all.
I wouldn’t say I’ve really heard any abnormal sounds. It’s the sensation of a juddering inconsistent acceleration. When I push it hard to force a downshift, there is uniform pressure to my back but when I push just enough to get boost without a downshift, the pulsatile acceleration is felt.
That's kind of what I figured is what you were trying to show from the video. To me it's difficult to see it. The sound I figured was expected. As mentioned though from what I could tell (was still kind of difficult) was that after that first let off (around 1 second in) and then begin acceleration, there does appear to be once, maybe twice where the acceleration isn't completely smooth/linear/lags a little. As far as I know, I don't believe I have experienced this with my 2022.
I mostly wanted to show what speed/conditions are inducing the judder. I’ll try and have a closer shot and replicate again. It’s seems really odd since it seems to perform well with higher load/lower gears. I would expect the opposite of this was a plug issue, no?
Try putting it in manual mode, you'll be able to keep the RPMs low to replicate it. (Just don't click the switch at the end of the pedal travel)
I actually am running 91 without ethanol so that’s a good thought. It was really pronounced today when the A/C was on and I tried to accelerate without it auto downshifting. I’ll try again in manual mode. What is the switch you are referring to?
If you push the throttle far enough you'll feel a click, this is a switch that will force the transmission to downshift to the lowest gear even in manual mode (for max acceleration). If you push the throttle down but without pressing that switch, in manual mode, it wont downshift and you can hold it at low RPM to test.
I think you’re right in that it isn’t lugging. Car accelerated slow but smooth at 1300 rpm to start with boost up half way. I really only notice it when traveling between 40-50 mph and rpm between 1800-2100 and give enough gas to induce the boost without shifting. I’m going to try 93 octane and see how it responds.
Interesting. Note that if the turbo gauge is about halfway up that's actually max boost. Max boost is around 10-12 psi, even though the gauge goes up to 20 (or 40 in the older models)
Well I tried out the 93 octane and initially thought there was some improvement but then noted same thing again today. What would a boost leak feel like? I imagine I’d notice similar hesitation under higher load too?
The accelerator is a passive switch so it doesn't have any force feedback. If you are feeling it through the pedal it's likely you're feeling vibrations from the body of the car transferring through the pedal to your foot.
