I was just thinking about emissions testing and I was wondering if running sequential fired injectors would reduce emissions? Since I’m running the Microtech EMS it can be set up to fire sequential instead of batch. What do you think? Would that help with emissions?

Thanks,

 

Doubt it matters since the ports are hardly ever closed. Unlike a piston engine, there is nearly a steady stream of air entering the engine through the intake ports. The piston engine based injection systems run sequential to try and keep the injector from opening to a closed valve.

 

Yeah, I guess that make sense, but in theory it should reduce it some right?
It just seems like people that have install the Microtech get better fuel economy so I was just guessing that would also mean lower emissions.

I need to get my car tested soon.
The original plan was not to drive it on the street but now I want to be able to at least drive it on the weekends.

Thanks

 

They get better fuel economy because they can do the engines to the edge before blowing the engine.

You can't do that when you mass produce engines, they don't have the time to individually tune each car.

 

Wouldn’t tuning the engine to the “edge” reduce emissions?

 

They get better fuel economy because they tune their cruise maps very lean. This will cause much higher NOX outputs, which actually increases emissions.

 

Yes, but more so at lower rpm's.

Make sure you have good spark plugs, coolant thermostat, fuel injectors, fuel filter, cat, and air pump, and take your car to a Microtech tuner who has an exhaust gas analyzer.

Most emissions decrease with a leaner mixture, but some increase. Most engines produce the lowest overall amount of tested emissions when run at the stoich AFR.

 

No, lean mixtures send production of NOx through the roof. The whole reason for using the O2 sensor to maintain stoichiometric mixtures at light load to because that's where the best compromise for minimising emissions occurs.