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s5fourdoor
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« Reply #15 on: October 24, 2011, 11:27:49 AM »
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sounds complicated.. why not just run the pro-m all year round?
you could... either way its better than no MAF. LOL... |
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NOTORIOUS VR
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« Reply #16 on: October 24, 2011, 11:29:48 AM »
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agreed
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Gonzo
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« Reply #17 on: October 24, 2011, 11:32:44 AM »
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MAF-less on ME7.1 is a big no no but on ME7.5 its doable.
Its still a headache even with ME7.5 though.
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nyet
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« Reply #19 on: October 24, 2011, 02:08:14 PM »
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Also I have NO idea why it isn't correcting in the begining, it tays 0.75 for a long time.
If req. AFR isn't lambda 1, you are open loop {links to google docs}
Pretty much worthless. Post the original CSVs, and/or graphs from ECUxPlot or xls templates (there are several floating around) Some input would be helpful :-) I am just getting started with this stuff.
ps: NOTORIOUS VR, I know that MAF delete is a wrong move but it's the only move right now.
"right now". Then wait till you can make the right move  Trying to get this working is pointless unless you aren't a noob. The only reason ME7 works at all MAFless is so the car is basically drivable till you can get it to a shop to fix the MAF. |
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orienz
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« Reply #20 on: October 25, 2011, 02:18:57 AM »
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nyet, you realize that this is ME7.5 with wideband O2 right? And you realize that there are several large tuning companies selling mafless files for this ECU? So it's totally doable.
Requested lambda wasn't 1 further down either and O2 is correcting. So it is closed loop all the time...
Not trying to sound bad but you people on this forum are a bit too stuck on S4 cars and ME7.1 ECU.
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« Last Edit: October 25, 2011, 02:20:31 AM by orienz »
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NOTORIOUS VR
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« Reply #21 on: October 25, 2011, 07:06:16 AM »
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nyet, you realize that this is ME7.5 with wideband O2 right? And you realize that there are several large tuning companies selling mafless files for this ECU? So it's totally doable. So what? You're still tricking the ECU... The ECU still wasn't meant to run without a MAF. Just because something is doable, doesn't mean it's the right way to do it. Not trying to sound bad but you people on this forum are a bit too stuck on S4 cars and ME7.1 ECU.
that has nothing to do with it. We're giving you this advise because you're trying to fool ME. Generally that is not a good thing to do when you're talking about deleting the primary load input. |
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nyet
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« Reply #22 on: October 25, 2011, 09:33:23 AM »
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nyet, you realize that this is ME7.5 with wideband O2 right? And you realize that there are several large tuning companies selling mafless files for this ECU? So it's totally doable.
Requested lambda wasn't 1 further down either and O2 is correcting. So it is closed loop all the time...
Not trying to sound bad but you people on this forum are a bit too stuck on S4 cars and ME7.1 ECU.
Fair enough. I didn't know it was a wideband project. |
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vwaudiguy
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« Reply #23 on: October 25, 2011, 10:04:37 PM »
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Fool ME? You act like it's alive.  You're creating a target afr and based on the wideband it follows it. Now you're relying on the 02..Maf's fail/become inaccurate over time too. I have a buddy running a large company's mafless file that drives 95% identical to when he had a maf. And the other 5% that is slightly different is very low load/rpm which he's almost never at. I personally can't feel the difference, but he says it's very slight but there. Well worth the lack of intake restriction and bay cleanliness of having a filter mounted on the turbo. |
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
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NOTORIOUS VR
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« Reply #24 on: October 26, 2011, 05:35:36 AM »
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It's much easier for an O2 sensor to go bad or read wrong undetected then it is a MAF sensor.
And yes you're fooling ME... Say what you want but it was never intended to be run Alpha-N style. It's primary load input is the MAF sensor, everything else is secondary.
Trusting your motor to ONLY sensors which are only able to read AFTER the combustion cycle has already happened is well stupid IMO. You're at this point relying heavily on your knock sensors to save your engines butt if the O2 sensors are wrong.
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vwaudiguy
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« Reply #25 on: October 26, 2011, 09:23:31 AM »
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Actually on the 1.8t's I see MAF's go left and right, and that's on stock cars not big turbo where there's a lot more airflow... and rarely primary 02's. Not trying to argue just wanted to say I know of people running happily without a MAF for years with no issues and good gas mileage/driveability. I agree with you that you are going against the architecture of Motronic working Alpha-N but it seems to work out in the end. And it's not my car anyway! haha
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"If you have a chinese turbo, that you are worried is going to blow up when you floor it, then LOL."
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Giannis
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« Reply #26 on: October 26, 2011, 10:13:37 AM »
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i am one of those people for a while.  |
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hammersword
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Revlimit ECU tuning
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« Reply #27 on: December 02, 2011, 06:18:58 PM »
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MAFless can be done with the same way and same results at ME7.1 and ME7.5
If you have no idea about injectors calibration or injection calibration then yes ME7.5 will do its best to save the engine or try to follow the target because it has wideband!
If you can calibrate fine the injectors and tune well then injection calculation disabling the fuel trims then you can have an excellent MAFless with NO issues. But this need experience on ME7
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Giannis
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« Reply #28 on: December 02, 2011, 11:07:22 PM »
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Or a lot of testing i may add.
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aef
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« Reply #29 on: August 22, 2012, 01:35:39 AM »
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Hi, can someone please give a statement regarding the pros and cons of mafless? And i dont mean clean engine bay  When is it really necessary to go mafless? Cheers |
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