turbojohan
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« on: August 18, 2016, 04:20:45 AM »
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Hello,
I hope someone can help me, i have a CDL golf6 R20 engine with BT.
Calibrated 90 mm MAF and stops at 364 g/s and won't give more fuel from that point.
Anyone an idea how to fix it?
Can't find a MLMAX or something in software.
It is completly build engine with bigger injectors etc. 500+hp.
Johan
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gman86
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« Reply #1 on: August 18, 2016, 04:59:36 AM »
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Either go larger MAF housing or run MAFless I'm afraid.
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turbojohan
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« Reply #2 on: August 18, 2016, 05:14:38 AM »
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i can do this MAF housing and don't for bigger housing and adjust fuel so it will be ok, but than everything is off.
MAFless gives same issue.
I ran i mafless and starts leaning out over 1.7 bar.
So i thought i try to run a big MAF, but has exactly same problem.
At higher boost it goes to 25% lambda adaption and has max 6.88 ms injection time.
Johan
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gman86
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« Reply #3 on: August 18, 2016, 06:13:08 AM »
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Are your injectors calibrated properly? What car and year are the injectors from?
Can you share a VCDS log with the following:
001
230
231
Also
001
031
101
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turbojohan
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« Reply #4 on: August 18, 2016, 07:12:00 AM »
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Injectors are scaled right.
Special bigger injectors and bigger pump with special camlobe and roll camfollower.
Everything works perfect untill you try more boost.
Fuel pressure stays perfect at spec.
I hope i can get a solution to get max MAF value higher, if not i need to underscale the MAF i think...
Johan
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Rick
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« Reply #5 on: August 18, 2016, 07:55:11 AM »
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Have you worked out your injector time relative to injector window?
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Carsinc
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« Reply #6 on: August 18, 2016, 08:48:03 AM »
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Um could you just change to a aftermarket maf? HPX pmas is used often on me7 stuff
Idk about med9.1
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turbojohan
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« Reply #7 on: August 18, 2016, 10:11:57 AM »
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@Rick, yes should be ok.
Could this cause a problem like this?
@Carsinc, It doesn't matter how big your MAF is, if you calibrate it right the problem is always on the same point.
If you have a HFM5 and have 4V and make 300 g/s a MAF housing twice as big will give 300 g/s @ 2V.
And if limit is 364 g/s in the ecu it will hit limit at same hp.
If you don't correct MAF it will give half your flow and you can adjust fuel but all load calculation will be off..
Correct me when i'm wrong..
Johan
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gman86
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« Reply #8 on: August 18, 2016, 04:45:01 PM »
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@Rick, yes should be ok.
Could this cause a problem like this?
@Carsinc, It doesn't matter how big your MAF is, if you calibrate it right the problem is always on the same point.
If you have a HFM5 and have 4V and make 300 g/s a MAF housing twice as big will give 300 g/s @ 2V.
And if limit is 364 g/s in the ecu it will hit limit at same hp.
If you don't correct MAF it will give half your flow and you can adjust fuel but all load calculation will be off..
Correct me when i'm wrong..
Johan
Your responses to my logging queries is "I think". If you can log those blocks, it'll give us an insight to what the car is doing. |
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turbojohan
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« Reply #9 on: August 19, 2016, 12:29:38 AM »
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will make some logs.
Johan
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Rick
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« Reply #10 on: August 19, 2016, 02:31:57 AM »
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It sounds more like fuel starvation more than a MAF issue.
Rick
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turbojohan
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« Reply #11 on: August 19, 2016, 05:10:27 AM »
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with underscaled MAF and 8 ms injection the lambda still is too lean on high rpm.
Back on MAFless again and more LP fuel pressure and lambda is getting better.
580 hp @ crank now.
Will do some more testing now..
Thanks for the help.
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gman86
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« Reply #12 on: August 19, 2016, 07:33:36 AM »
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with underscaled MAF and 8 ms injection the lambda still is too lean on high rpm.
Back on MAFless again and more LP fuel pressure and lambda is getting better.
580 hp @ crank now.
Will do some more testing now..
Thanks for the help.
Have you adjusted injection advance? If using RS4 injectors, they don't mix properly and you end up with lean spots in the cylinder. Try fully advancing injection start time. |
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turbojohan
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« Reply #13 on: August 19, 2016, 08:01:27 AM »
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I run something bit bigger as RS4.
I tried 420 degree, 400 is stock.
Do you advance a lot more?
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gman86
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« Reply #14 on: August 19, 2016, 09:02:24 AM »
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I run something bit bigger as RS4.
I tried 420 degree, 400 is stock.
Do you advance a lot more?
431 is is the maximum. I always fully advance at top end on bigger fuel demand setups as it gives you more of an injection window = more time to spray. With RS4 or other injectors with sub-optimal spray, fully advance as soon as entering peak boost. With wrong spray pattern, the mixture isn't quite homogenous as it'll either spray outside the piston bowl or directly against the cylinder wall. Giving fuel more time in the cylinder allows more time to mix with the air for a uniform cylinder charge. |
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