a200tq
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« on: April 15, 2011, 03:43:29 PM »
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Hello!
Last day i am spoke with builder of heavy-modified RS4 B5 engine. He ask me about mafless tuning of the RS4 SW. Yes, according to MLHFM stock RS4 MAF overflow only near 550 g/s (600+ hp), but he dont whant MAF under the hood.
So, i am searching info about this, but not clear understand some moments.
1. When MAF is unplugged, ME7 go to the limp mode with only 1440 millibar without boost regulation, right?. What codewort i must change for no limp mode and normal boost regulation, or external boost controller is only option?
2. How ME7 calculate load without MAF signal? Based on TPS-RPM-MAP signal?
3. Is the 2550 millibar stock map-hard limit for mafless car? With MAF, this is possible rise up boost higher then this.
Any ideas about this?
Thank you.
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hammersword
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Revlimit ECU tuning
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« Reply #1 on: April 18, 2011, 06:23:46 PM »
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The MAFless is a nice option which I like to set on VAGs over 500hp For MAFless setups your ECU must be the wideband one so wideband lambda always stays at closed loop even though in WOT conditions and keeps the AFR always as close to the target! In non wideband ECUs (400bb) I don't suggest it, If you still want it, keep one boost setup only! Load is the TP on MAFless.... MAP there is only for boost controling!  I prefer always to tune ECU and give the car owner to have 2 options at the same time.... MAFless or MAF enabled! This requires perfect injectors calibration! |
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Rick
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« Reply #2 on: April 19, 2011, 01:43:31 PM »
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S4 ECU's are all Narrow band, even though some use 800 flash chips.
Rick
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hammersword
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Revlimit ECU tuning
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« Reply #3 on: April 19, 2011, 02:01:51 PM »
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for narrowband ECUs I don't suggest MAFless...
If you try it, you must have installed a wideband sensor and gauge all time in the engine!
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nyet
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« Reply #4 on: April 19, 2011, 07:12:02 PM »
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for narrowband ECUs I don't suggest MAFless...
If you try it, you must have installed a wideband sensor and gauge all time in the engine!
How would you approach this with the S4? Also, what to do about the MAP limit? |
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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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hammersword
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Revlimit ECU tuning
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« Reply #5 on: April 20, 2011, 07:26:26 AM »
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on the MAFless tune, Load is TP!
MAP is only for boost controling!
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kelesha
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« Reply #6 on: April 20, 2011, 01:23:50 PM »
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on the MAFless tune, Load is TP!
MAP is only for boost controling!
Thats not true In properly configured MAFless tune, load is boost depend, and it can be done on narrow band ECUs without problem too  |
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Rick
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« Reply #7 on: April 20, 2011, 01:28:14 PM »
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It's MAP dependant, then TP dependant if MAP sensor fails.
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NOTORIOUS VR
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« Reply #8 on: April 20, 2011, 02:24:43 PM »
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It's MAP dependant, then TP dependant if MAP sensor fails.
and what about when you go over the MAP limit? TP again? |
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julex
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« Reply #9 on: April 20, 2011, 06:21:52 PM »
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It's MAP dependant, then TP dependant if MAP sensor fails.
and what about when you go over the MAP limit? TP again? If you're over Map how is the ecu to tell how much is going on? Mafless on 1.8t+ is only possible b/c of wideband o2s. If they didn't have wideband o2, they would be all running MAF tunes. |
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kelesha
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« Reply #10 on: April 20, 2011, 11:08:00 PM »
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It's MAP dependant, then TP dependant if MAP sensor fails.
and what about when you go over the MAP limit? TP again? Over MAP limit and when MAP sensor fail.........both are other stories and they are different each to other |
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kelesha
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« Reply #11 on: April 20, 2011, 11:27:31 PM »
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If you're over Map how is the ecu to tell how much is going on? Mafless on 1.8t+ is only possible b/c of wideband o2s. If they didn't have wideband o2, they would be all running MAF tunes.
If you use stock MAP sensor then you have "limit" 1.5bar boost, but if you install 3bar MAP sensor then you can run 2bar boost problem free, really i dont try to install 3.5 or 4bar MAPs but with 3bar there is not any problem to run MAFless. And one more time i need to point that MAFless tunes are not only for wide band ECUs, they can be done on narrow band with same success |
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kelesha
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« Reply #13 on: April 21, 2011, 01:10:20 AM »
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its possible w/o throwing codes, or adjusting the 0 bar point? What codes you think it will throw with 3bar MAP ?  |
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nyet
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« Reply #14 on: April 21, 2011, 01:59:25 AM »
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its possible w/o throwing codes, or adjusting the 0 bar point? What codes you think it will throw with 3bar MAP ? Don't know, never tried one. I assumed there would be problems around the 0 (1 absolute) bar point but I guess not? That and i was unsure how to tune speed/density mode (dead MAF) with an underscaled MAP. Can you give any tips? |
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« Last Edit: April 21, 2011, 02:01:10 AM by nyet »
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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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