16g-95gsc
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« Reply #15 on: April 02, 2013, 03:50:17 PM »
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I think you guys are misunderstanding me.
I am not looking to over-engineer the setup. The question was simply what MAF housing do you find to be best to work with. The idea of SD is undeniably less restrictive than any inlet setup (no I am not simply talking about JUST the MAF, I am speaking of the whole system).
Nyet, that brings up another thing that I was curious about. Do you find heavy non-linearity with cone filters even with MAF screens in place?
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nyet
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« Reply #16 on: April 02, 2013, 05:04:08 PM »
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The idea of SD is undeniably less restrictive than any inlet setup (no I am not simply talking about JUST the MAF, I am speaking of the whole system). Blowthrough is an alternative compromise you might also consider.. Nyet, that brings up another thing that I was curious about. Do you find heavy non-linearity with cone filters even with MAF screens in place?
Yes, depending on the length of the inlet before the MAF. Screens do help to some extent (see also AWE's 100mm MAF that reads like an 85mm MAF  But a long inlet *and* a screen can get you close... at least close enough that massaging it out in KFKHFM isn't difficult. |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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16g-95gsc
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« Reply #17 on: April 02, 2013, 05:32:04 PM »
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The way this setup is CRAMMED into the engine bay I just don't see how blow through is possible without severe modification.
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nyet
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« Reply #18 on: April 02, 2013, 07:37:29 PM »
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The way this setup is CRAMMED into the engine bay I just don't see how blow through is possible without severe modification.
Then you're stuck with SD, or a lot of time on the dyno calibrating your MAF  |
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ME7.1 tuning guideECUx PlotME7Sum checksumTrim heatmap toolPlease do not ask me for tunes. I'm here to help people make their own. Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
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ddillenger
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« Reply #19 on: April 02, 2013, 08:37:05 PM »
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This is a ludicrous discussion to be having for k04's. You're making an issue where there isn't one. Pretty much ANY 85mm off the shelf MAF will work fine in your application. If you want a known transfer function, get an RS4 or S6 unit.
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Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your experience!
Email/Google chat:
DDillenger84(at)gmail(dot)com
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NOTORIOUS VR
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« Reply #20 on: April 03, 2013, 07:31:14 AM »
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^^^ Agreed, not even sure why this is being discussed... an 85mm MAF will prove the Op with all the resolution he would need on a K04 setup w/o being a restriction.
Also SD being Speed Density?
Can I ask once and for all... can/does ME7 even really do SD? I was always of the opinion that ME7 cannot do true SD... and that it uses tables of modeled airflow when running w/o a MAF. That is not SD.
Or am I missing something here and there is a way to use the MAP sensor as a load input to replace the MAF?
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phila_dot
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« Reply #21 on: April 03, 2013, 08:25:34 AM »
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Nope...without MAF input it basically switches to Alpha-N.
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prj
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« Reply #22 on: April 03, 2013, 08:56:27 AM »
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I would recommend looking at it and seeing how it actually works...
It does use the charge pressure sensor signal to scale load, but this can only be done at WOT realistically.
The problem is that ME7 with a HFM has a charge pressure sensor, not a MAP sensor.
A MAP sensor refers to Manifold Absolute Pressure. But the sensor is a charge pressure sensor before the throttle plate.
To run speed density, a second sensor, an actual MAP sensor must be installed and fed from the manifold, routed into the MAF signal on the ECU and then the ECU needs to have it's code re-written.
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NOTORIOUS VR
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« Reply #23 on: April 03, 2013, 11:14:33 AM »
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I would recommend looking at it and seeing how it actually works...
It does use the charge pressure sensor signal to scale load, but this can only be done at WOT realistically.
The problem is that ME7 with a HFM has a charge pressure sensor, not a MAP sensor.
A MAP sensor refers to Manifold Absolute Pressure. But the sensor is a charge pressure sensor before the throttle plate.
To run speed density, a second sensor, an actual MAP sensor must be installed and fed from the manifold, routed into the MAF signal on the ECU and then the ECU needs to have it's code re-written.
Right, that makes perfect sense about the pressure sensor situation. So in the end, removing ME's primary load input (MAF) is just silly regardless if it can be "made to work" and if you look around more and more "tuners" do not offer MAF-less anymore because it's just a PITA and will never run 100%. The Alpha-N maps in the ECU are there as a fail safe/limp home situation, not to get around tuning/driving without a MAF completely. |
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prj
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« Reply #24 on: April 03, 2013, 12:29:44 PM »
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Correct, that's why I am working on a real MAFless solution, not limp mode. I already have this on an older Bosch ECU and it works perfectly, but it's a different architecture and works very differently from ME7, so while I know exactly how to write the algorithms, it's a different story with putting them in the right spot for ME7 |
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NOTORIOUS VR
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« Reply #25 on: April 03, 2013, 12:55:25 PM »
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Correct, that's why I am working on a real MAFless solution, not limp mode. I already have this on an older Bosch ECU and it works perfectly, but it's a different architecture and works very differently from ME7, so while I know exactly how to write the algorithms, it's a different story with putting them in the right spot for ME7 No doubt, I'll be looking forward to your progress... hopefully you will share with us your project experiences (not asking you to share your code) to see how you get on with it. |
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