black smoke on an AAZ without turbo

[paolomarks]

Hello, I have removed the turbo from my AAZ due to catastrophic turbo failure.( turbine shaft broke in two).  I re routed my intake and got a new exhaust put on. It runs fine although with a bit less power of course. What I'm a bit worried about is that it puts out a lot more black smoke now under load.  I understand that this can be controlled by adjusting the "smoke" screw on the IP. Where is this exactly and how much should it be adjusted.  ?  Thanks, Paolo

[vanbcguy]

The max fuel screw is probably what you will have to adjust.  It is a large screw with a locknut on it above the high pressure lines on the pump.  Small adjustments to this screw have a large impact on fuel delivery - only turn it about 1/4 turn at a time maximum.  Usually it has a steel collar on it and it has a large slot in the end of it.  Loosen it (counter clockwise) to reduce fueling.

After you reduce your fueling you may have to adjust your idle speed again!