I know many people have asked abnout running with no maf but i was wondering if you could run with no maf if i was running a piggyback(e-manage) and i had a wideband o2 sensor. Wouldnt i be able to tune the a/f ratio myself for certain rpms so the maf would serve no function? In another thread hobie told me that the piggyback works with the maf is that always the case or can the wideband replace the maf in that "relationship"? My last question is what does the maf actually do i could be totally wrong but it was always my undestyanding that is senses how much air is going in to engine in order to properly adjust the a/f ratio. Thanks guys just wodering on these.

-Josh

 

Only if you want your car to run for more than a few seconds at a time. The wideband does not replace the MAF. O2 sensors in fact have nothing to do with the MAF. They're just both sensors the ECU uses to gauge fuel consumption and necessity respectively. The MAF monitors intake air, the O2 sensor monitors exhaust gas air/fuel ratios. You MAY be able to run only a MAP sensor if you used an E-manage with the optional MAP sensor harness etc., however I don't think anyone has done this, and I don't know for certain if the ECU will allow you to tune in this case either. I'm sure engineerboy would have more insight in regard to that though.

 

thanks hobie after reading your post i have more questions but ill look on the emanage forums see if i find anything.

 

You need the MAF. The pressure sensor is just to help in boosted applications after the max flow reading of the MAF has been reached. Or in applications where the MAF isn't otherwise reading sufficiently. The ECU relies very heavily on information from the MAF and will go into limp mode without it. That means it won't accept any electronic inputs as it has determined that there is a serious problem.

Hobie's the guy to talk to if you want to take the MAF off and use a standalone management system (like his AEM)

 

Lesson #1: Prepare for standalone engine management.

This lesson begins with the purchase of an economy size bottle of your favorite pain reliver. I would recommend Tylenol as it's easier on your stomach, which will become an issue as you develop ulcers from severe stress.

j/p, but seriously standalone is GREAT, but it's also a HUGE commitment financially and emotionally.

 

Im going to start with the e-manage so i can fall back on the stock ecu incase i need to. Ill use it as a stepping stone.

 

I think you'll find the eM a satisfactory tuning tool. There are some bugs in my setup that may or may not be in some or all of the other eM setups. For one, the ECU learning around the new maps. I think I have the fix for this, but I'm not saying until I know for sure. If I DO have the fix, it'll be pricey for the beginner (it requires the support tool, laptop/profec, and another eM adapter) but the adapter is only $19 so it's relatively cheap for the long-term user.

Also, to get to the additional injector maps that I talked about you do need the support tool and laptop/profec, so that's something to consider as you're shopping for GReddy. There's alos a rumor about a gold eM being released that has firmware that can autotune to the AFR you specify (taking all of the guess work out of the tuning procedure) if you have a WBO2 hooked up. You'd still have control over the maps, but it'll zoom in on a desired AFR. Good times ahead!

also check the AFR for n00bs thread for eM updates as I get bugs fixed and there's TONS of info here and on emanageusers.com

 

I'm still amazed that the Lancer's ECU is doing things that don't seem to be common of other similar model year ECU's...at least not insofar as I know. Do other makes/models have similar problems with ECU's asserting themselves and/or going closed loop?

 

I dunno exactly, but I guess it's a pretty common complaint because a guy in the yahoo group said he'd read a fairly extensive article describing what the issues are and how the Evo ECU responds to the eM mapping. Of course, he couldn't remeber where The guy who wrote the how to that's in my sig is actually a member here and he hipped me to a potential fix (he claims no problems so far, even without the extra adapter). We'll see how it works when Mohd gets it out ot me (hopefully tomorrow, maybe Thursday).

Oh, and the RA guys have a hell of a time, partly because of the MiVEC and that they have a pressure sensor in addition to the MAF. Friggin Mitsu. You know, if they want bigger market share, they really need to cater to those of us who want to tune the cars. I can't imagine that having an ECU that's eM friendly could in any way effect the car negatively.

 

does anyone offer pb for the evo? If so i dont see how they are able to keep the tune when the eM isnt. and how does the rrm pb hold its tune? I dont see those being able to hold their tune and keep the ecu from learning around it while the eM cant... unless they have some kind of xtra senor built in.

 

precisely. And mum's the word when splitsecond or RRM are asked about how thier system works (or so I've heard).

The Evo has stuff like Xede and dynoflash that fully or partially remap the ECU (from what I can gather from reading). But there are a few folks who use the eM with success and the adapter fix I've been told about is one way they do it.

I guess one ting to keep in mind is, my car ALWAYS seems to have the problem no one else does. So running into stuff like this and having to find fixes is par for the course

 

well as soon as my wiring harness comes in and i get the money for the wideband... ill let you know if my car does it lol... hopefully you will have a fix by that point

 

There is always VPC if you want to get rid of the MAF. I know it is an older unit but works wonders on other Mitsus in eliminating that MAF.

 

OMG, VPC, unless depreciation, costs a lot, almost like a standalone.