Difficulty with B8 S4 Turbo Performance After Recent Upgrade

General Discussion
#1

Hello

I recently upgraded my B8 S4 with a new turbocharger but I’m noticing a drop in overall performance. The car feels sluggish & I have experienced occasional misfires at higher RPMs. I’ve checked for leaks and cleared any fault codes, but the issue persists. :innocent:

I am wondering if anyone has encountered similar performance issues after a turbo upgrade, and what troubleshooting steps might help identify the root cause. :thinking: Checked B8 S4 performance expectations thread.MongoDB guide for reference .

Any suggestions or insights would be greatly appreciated!

Thank you ! :slightly_smiling_face:

#2

First of all, expand a little on information about your car. You say Turbo performance, did this car have a conversion as the B8 S4 3.0t had a Supercharger, not a Turbocharger? A4 2.0t had a Turbocharger?