Quote:
Originally Posted by BlackSportD
With the E6x, wouldn't it make it even harder to tune to pass emissions/make the OE computer happy? I'm read batch fire is not as good as sequential if going under the sniffer-- but, megasquirt guys have tuned to pass the sniffer.
Leo, if running a 4cyl you can now build a microsquirt setup to be sequential! Building one for a friends AE86.
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I vaguely remember the E6X didn't have a closed loop table where you can set the target air/fuel ratios for load & engine speed. It had a stoich voltage and would try to maintain that voltage during cruising speeds. Someone correct me if I'm totally wrong. If that's the case then it will be very tricky to not trigger a bank too lean code. The stock ECU likes to see a slightly richer air/fuel ratio during cruise but at lighter loads is fine with being at stoich. Other that that, I don't see it would be any harder to make the ECU happy with the simulators. Tuning for the sniffer is completely different, money talks and can probably get you to pass but I've heard/read stories of using higher octane, alcohol, and using an air pump in the exhaust stream. Massachusetts doesn't have to deal with that so I never got a chance to experience it first hand.
What would be cool is if you can actually use an available input and output from the MS to simulate the narrowband. Imagine if you can reconfigure an input to measure the amount of time injector 1 is grounded for then generate a .45 volt to simulate the narrowband. Measure the time again, if the new time is greater than the old time generate a .48 volt. If it's less then generate a .42 volt signal. Repeat those steps for the whole duration, +/-.3 volts, of time the engine is running. In theory the ECU will keep the fuel trims very close to 0% since the narrowband signals are changing relative to the injector pulsewidth. No more long term fuel trim CELs! It's all opensource code, just need to have someone with a lot of free time to experiment.
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