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XfireZ51 · 04-06-2014

Drone can be mitigated in a few ways. You'll find that if the motor is running "fat" or rich, you'll get more drone. It also happens when MAP is
increasing as in a slow acceleration or going up an incline. When decelerating or steady pedal the motor is very quiet. The NPP valves are very good but the issue has been that they vary the opening w vacuum. That's why mike100 and myself have been playing w ways if keeping the valves closed regardless of variation in the vacuum signal.

04-06-2014	#32
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: Exhaust thoughts?? Drone can be mitigated in a few ways. You'll find that if the motor is running "fat" or rich, you'll get more drone. It also happens when MAP is increasing as in a slow acceleration or going up an incline. When decelerating or steady pedal the motor is very quiet. The NPP valves are very good but the issue has been that they vary the opening w vacuum. That's why mike100 and myself have been playing w ways if keeping the valves closed regardless of variation in the vacuum signal.