Greddy Emanage w/ wideband = autotune

[turbo6]

A little brainstorming

Could you take emanage which fuel and timing are adjusted in reference to two other inputs. Typically one would reference BOOST and RPM. or TPS and RPM if you are too cheap for MAP sensor, etc.

Anyways, my thoughts........ the MAP sensor is a 0-5v input to emanage. With an adjustable output wideband , you could set 9-15:1 af as 0-5v, and use it as the MAP input.

THEN , go into emanage support and set the higher the "boost" (which would now be af ratio) to add more fuel, and when low "boost" to remove fuel and find where 11.5af is and dont add or remove.

There would be no "map", so it would constantly run and adjust. This is assuming the processor is fast enough to make the changes on the fly, which it supposedly is. I guess there is an easy way to find out, but it sucks to change all settings, rewire MAP & wideband, etc so it would be better to think this through first.

Only referencing "boost" (af) in the fuel map, and use maybe TPS and RPM for ignition

Any problems or comments (other than "buy a standalone")

[andrave]

I would think that would lag, because a map or mafs sensor works by putting fuel in the engine for the air that is coming in. Your solution would have it compensating for incoming air with the assumption that it would need the same amount of fuel as the out going air did.which wouldn't react at all to changes...

[msaskin]

The e-manage maps are based on Load vs. RPM, not to mention the fact that it only uses the MAP sensor option for when you over-run the MAF and the load level flat lines.

Are you planning on reprogramming the e-manage?

~matt

[turbo6]

ANDRAVE: Look at standalones with wideband autotune. They correct a/f by what the wideband o2 is reading. I am guessing that at this many rpm the split split second is close enough. With a 16:1 a/f tune on FAST, then turning o2 correction on with a target of 11.5:1, the logs show a dead steady 11.5:1 af ratio using instant o2 corrections. I would hope emanage could react as fast, but do not know this for fact. MSASKIN: At 500+whp , my 290hp stock MAF is exceeded very quickly.

As far as being based on Load vs RPM, mine are not. You can select what you want each map to run on, and normally I would use MAP vs RPM.

[andrave]

right but they are programmed to ADJUST the airfuel like thatand once they set that up, thats it. you run them like that in set up mode so they can "learn" what air fuel curves to run.you are talking about running a wideband in place of the mafs, to run it every day with. Its not gonna run smooth, even if you could get it to work. standalones still use an air metering device to supply the fuel, they just use a wideband as an option to get your a/f ratio where it needs to be on set up mode. Besides its way too expensive to run a wideband on a daily basis, by the time you stack up a year's worth of sensors (they go through them very fast) you will have spent more than just buying a wideband.Did you know that the AEM EMS system is available for the 240 now? maybe you should go that direction if you really wanna let an ECU tune itself with a wideband. E manage isn't set up for it and I don't think its gonna work the way you are talking about.

[UncleBen]

He doesn't have a 240, he has a Maxima. See his sig.

[msaskin]

[quote=" andrave [BDid you know that the AEM EMS system is available for the 240 now? maybe you should go that direction if you really wanna let an ECU tune itself with a wideband. E manage isn't set up for it and I don't think its gonna work the way you are talking about. [/quote]

Not quite. The Nissan EMS applications aren't being released for at least 1.5 months, and that's coming straight from the mouth of the engineer developing them @ AEM.

Also, they are releasing an EMS for a good majority of nissan 4 cylinder vehicles, not just the 240sx.

The list of anticipated nissan apps is here: http://forum.aempower.com/bbs/viewtopic.php?t=7666

~matt

[andrave]

there is a guy in kat forum that has it. so. ok.

[msaskin]

there is a guy in kat forum that has it. so. ok.

yeah, he's from http://www.phatka-t.com, they're helping AEM with the prototyping of the unit.

It also helps that phatka-t is a division of sound performance, perhaps one of the largest supra shops in the country

~matt