Ok, while i was on the can about 5minutes ago, I was thinking about some of the engine management problems with the alpha3 and beta2 (aka the MAP cars). The biggest problem with piggybacks on MAP cars (other than the fact that its not a standalone) is there isnt nearly the amount of flexibilty in changing the MAP sensor's output in the way there is on MAF cars from what I can see. Couple this with the lack of a rrfpr and you've got a great recipe for running lean once the stock 1bar MAP sensor is maxed out (i.e. any type of boost).

One of the good things about the GReddy Emanage is it lets you add to the injector signal from the ecm to the injector to make it stay open longer. It also has the ability to adjust the readings from the MAP sensor to the ecm. This should get you around most of the tuning issues, but you'll still have a CEL unless you clamp the MAP sensor at atmospheric pressure. But then you're gonna simply be changing injector pulse width with RPM or TPS.

However, the Emanage does have an additional input for its own MAP sensor, so you can build a map that varies with boost. Could one then simply mount the stock MAP sensor remotely with a pressure line coming from the IM with a chcek valve that closes when it senses boost? That would stop the CEL and stop the ghetto tuning map.

Opinions?

 

If the E-manage has the ability to manipulate the stock MAP sensor readings, it could effecively "clamp" the stock MAP reading to prevent the CEL. Trying to do that via some Physical hardware device would be VERY difficult.(vs electronic/software).

If the E-manage has it's own internal MAP sensor, and has the ability to manipulate/add/subtract time to the stock injector pulse, then you should be able to build your own ecu maps within the E-Manage to deal with boost situations. You can relay on the stock ECU map for all other situations.

My only question/concern, is does the E-manange control ignition? If so, does it alter the stock ignition signal, or do you have to program the ignition timing yourself? Does it have a boost dependant ignition retard feature?

 

I know other NA cars have plug in devices that just clamp the MAP sensor voltage when it goes bezerk from added boost. You may be able to find one that's in your voltage range for a similar MAP sensor?

This would fool the ECU into thinking you didn't have boost and then a separate MAP sensor for boost would drive the piggy back unit. Just an idea.

Don't know much beyond that. If I see a link to what I'm describing, I'll be sure to post it here.

good luck,
ac

 

Tony-I'm not sure exactly how it controls ignition, but I know it can.

http://www.mkiv.com/tmp/emanage/

 

Its DIRECTLY takes over ignition. Sending the fire commands to the coils.

And yes it can handle DIS.


Yes the E-manage can adjust the map/maf signal like an SAFC but it can also CLAMP the signal so the ecu does not see past a point.

 

so in the long run, the e-manage would be a better way to go instead of the s-afc and msd dis-2 right?
i am running the dis-2 now but i was thinking of going with the cnk ecu because it pulls ignition and fuel but i am also leaving my options open to see what you guys think.
cnk ecu, greddy e-manage or s-afc with msd???

 

Last I read... CNK ONLY DOES FUEL TIMING.

Skeird and Turbulence and Myself will be attempting an E-manage install Next week.

So we might as well stop speculating and wait to see what really can be done.

 

That's not what CNK is telling though smile.gif

Look in this thread.