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nyet
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« Reply #45 on: March 17, 2013, 08:34:38 PM »
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So probably i have to rise 3 last columns in KFMIOP and KFMIRL and then my actual load should match desired ?
No. That won't do what you want. Your load is low because your MAF is underscaled. |
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vagenwerk
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« Reply #46 on: March 18, 2013, 03:32:56 AM »
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No. That won't do what you want.
Your load is low because your MAF is underscaled.
On stock maf 3 days ago i have the same load values. is the stock maf underscaled too ? |
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nyet
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« Reply #47 on: March 18, 2013, 11:19:33 AM »
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On stock maf 3 days ago i have the same load values. is the stock maf underscaled too ?
Probably a boost leak sucking in unmetered air? |
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vagenwerk
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« Reply #48 on: March 18, 2013, 02:37:28 PM »
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I am 100% sure that is no leaks ( pressure test ).
My fuel trims as i said are -0.2%idle , and -0.8% partial load, my fuel trims during driving are oscilating +-3% in all rpms. so i think that maf is scaled properly. also on stock maf actual load was also lower than desired..
What else could make that my actual load is so low ?
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nyet
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« Reply #49 on: March 18, 2013, 02:42:28 PM »
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It doesn't look that off to me...
can you post the actual csvs, or output from ECUxPlot?
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vagenwerk
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« Reply #50 on: March 19, 2013, 11:18:44 AM »
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I have done today test - unplug maf, and watch the load. boost desired match to actual , but actual load was still lower than desired.
I start to think about KFLBTS - because some time ago i sort out fueling - and i change load axis in this map , could it cause issue with low load ?
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« Last Edit: August 19, 2013, 10:03:41 AM by vagenwerk »
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nyet
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« Reply #51 on: March 19, 2013, 11:20:39 AM »
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Please post the actual .csv, or output from ECUxPlot
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nyet
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« Reply #52 on: March 19, 2013, 11:24:15 AM »
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1) I don't see req load 2) Load will be even more inaccurate in speed density. 3) Actual load doesn't look that far off I start to think about KFLBTS - because some time ago i sort out fueling - and i change load axis in this map , could it cause issue with low load ?
No. I still don't think your actual load is that low. |
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vagenwerk
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« Reply #53 on: March 19, 2013, 11:35:52 AM »
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boost @load
In according to boost which is peak 1.25bar , from my estimate we should get 195%load (195+30 give 1.25bar @3250rpm boost in peak) and then we get about 1.05bar boost 3500-4700rpm which could give load about 175%
But as you can see ecu indicate only 165% peak @3250rpm and about 152% from 3500-4500rpm
I try to unplug maf, but there is no changes in boost or load readings
Where is the problem with indicating so low load readings?
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« Last Edit: March 19, 2013, 12:36:14 PM by gregor10 »
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vagenwerk
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« Reply #54 on: March 23, 2013, 06:11:55 AM »
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Any help ?
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littco
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« Reply #55 on: March 23, 2013, 06:50:09 AM »
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Any help ?
Boost leak, pressure drop over Fmic or possibly bad map sensor? Your asking for 175 load.. 175*10+300 = 2050 mbar equals 15psi assuming 1000mbar atmosphere.. Your boost though is saying 2200mb which is 17-18psi assuming 1000mbar standard atmosphere.. You therefore have a 2-3 psi loss The actual load is 160 which is taken off the maf.. Now assuming your maf is working well then what your Ecu is actually seeing as boost and what is actually going through aren't the same.. Do you have a boost gauge to see if you actually getting the same boost level the Ecu is reporting? |
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vagenwerk
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« Reply #56 on: March 23, 2013, 01:01:35 PM »
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Thanks for inpust littico. So I will install Boost gauge and check what is going on with boost in real.
Actually i have new maf sensor , new lambda and no boost leaks... smic is stock.
I noticed one odd think. On my old setup (from factory) AJQ engine 180hp @ 235Nm my boost was about 0.7bar to redline, ii have forge tip + decats , and maf reads about 160g/s everythink was fine , and car run very strong.
Then i go wideband conversion, changed maf to newer (from AUQ/AUM engine 06a906461L) , instal wideband lambda, disable sai , disable post cat lambda + disable vvt in flash (because my car doesn't have vvt sai and post o2 ).
I found strange think - on the newer setup wideband (with stock ldrxn from 180auq) maf(genuine bosch) read only 148g/s @ 0.7bar @6000rpm
It is quite strange for me. On the actual boost 0.8bar@6000rpm maf reads only 152g/s.
I have no idea what is going on ? For test i change ecu to narrowband and old maf type, and reads same as before 160g/s @0.7bar boost @6000rpm (163g/s peak on 2nd gear). Switch to new setup and still 152g/s @0.8bar boost @ 6000rpm.
What you think about it ?
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nyet
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« Reply #57 on: March 23, 2013, 02:06:23 PM »
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If the MAF reads differently you should be able to see it in the fuel trims
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vagenwerk
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« Reply #58 on: March 23, 2013, 02:38:18 PM »
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Yes nyet, but on both ecu (narrowband + old type maf + narrowband lambda) and wideband + new type maf +wideband lambda fuel trims was +-2% ! very very strange for me.
maybe it is my imagination but on the new wideband setup with stock 180hp map i feel thah car runs weaker in comparision to narrowband 180hp....
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nyet
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« Reply #59 on: March 25, 2013, 03:56:54 PM »
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maybe it is my imagination but on the new wideband setup with stock 180hp map i feel thah car runs weaker in comparision to narrowband 180hp....
Don't mean to be critical, but it is kinda pointless tuning car if you have no meaningful way to measure what is going on, either with a dyno, or logs, or even a g-tech. BTW ECUxPlot can estimate HP from just RPM vs time. |
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