Blue smoke right after full catless downpipes install?

Avedis53 said:

Vr30will said:

Right after I removed the catalityc converters and exhaust my Q50 started throwing a lil blue smoke, it’s not a continuous smoke, just when I let it idle for some minutes or when I’m not accelerating much and then I press the accelerator it throws a smoke ball

Turbos are fine, my mechanic said there was no oil in them and I have never had any smoke on the car

I’m not tuned yet, will tune it in a few weeks… what yall recommend? I don’t have an oil catch can either

3” Catless downpipes + 2.5” Agency Power dual exhaust

I also did a maintenance the same day and the mechanic put 6qts of oil, and the dip stick was reading higher than normal…

I have attached a video where you can clearly see the smoke

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Running catless full downpipes requires retuning the engine. Otherwise:

You've reduced the post-turbo back pressure installing the FDPs which can cause uncontrolled boost spikes because the wastegate duty cycle is calibrated for the more restrictive cats.

Potential over-speeding of the turbos.

The ECM needs recalibration as the OEM ECM logic can't properly manage boost, fueling, and timing.

Possible check engine light or other O2-related DTCs.

When you install catless FDPs, any excess raw fuel vapor that is normally burned off in the cats will result in visible smoke, especially at idle as the engine is running rich. Does the smoke smell like raw fuel?

6 qts of oil won't cause this.

Click to expand...