- Vibrations under load at low RPM on Audi A4/A5 B9 w/ APR st1
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    1. n00b
      Join Date
      Feb 27th, 2016
      Audi A5 B9
      02-01-2019 05:41 AM #1
      I'm sorry if the similar thread has already been on this forum (didn't find smth).
      My car is an Audi A5 2.0 tfsi quattro with APR stage 1 93aki. I have noticeable vibrations under the load on high gears and low rpms. So the gearbox doesn't downshift - it tries to go on higher gear because of big torque (due to ECU tune of course). It really hurts to feel my car is getting this charge on the drivetrain.

      Any other ideas about origin of these vibrations? And what can I do with them? Maybe TCU tune will help or something like dogbone insert ...

      P.S. It seems that my problem is unlikely to be a priority for the APR to be fixed. But imo decreasing the boost on low rpm will definitely fix this.

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    3. 02-02-2019 03:21 PM #2
      in idle rpm is normal or going up and down
      in tiptronic is better or the same the vibration feeling ???
      can be too much torque(nm) check for diagnostic if you have faults

    4. n00b Thetechnician's Avatar
      Join Date
      Nov 17th, 2019
      South Carolina
      2015 GTI SE 2DR, 2011 Jetta Sportswagen TDI
      03-02-2020 06:11 AM #3
      You're basically lugging the engine. Same thing happened to me when I floored it in 5th gear in manual mode. Engineering Explained has a good video about it.
      2015 GTI SE 2dr | Stage 2 | VWR springs | 034 RSB | Luft Technik intake | Euro LED taillights | Rotiform RSE

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