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nyet
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« Reply #15 on: March 07, 2024, 12:34:40 PM »
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- Lower the timings?
yes - Adjust fuel map to higher fuel pressure? - KRKTE?! - But for KRKTE I´d need the adress  You should not have started tuning w/o knowing KRTE or let alone TOUCHING your fuel pressure regulator. |
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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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vitali1411
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« Reply #16 on: March 07, 2024, 01:34:11 PM »
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Yes in the S4 Wiki it was told that "fuelling first". I thought 1st getting my boost problem corrected then fuelling. I found KRKTE... Thanks to this forum Is my assumption right that fuelling in general is assumed to be linear and small deviations are corrected later? If I increased the fuel pressure by 20%, I have to decrease KRKTE by 20% (so decrease the injector on time by 20%) and look how it is going? Of course with a view on the AFR gauge. |
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vitali1411
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« Reply #17 on: March 07, 2024, 02:29:12 PM »
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Some additional questions are coming up.
I can´t really understand, why injector on time is such high.
"KRKTE - Airmass to fuel injector on time conversion based on injector size and fuel pressure (primary fueling)"
Means:
My original injectors are at their limit because of measured airmass or the mixture is to fat.
APY´s original injectors should max out at ~280-300hp. The AFR gauge shows ~11.8:1 @ 6000upm
I can hardly imagine that I am scratching at 300hp with this stage 1 turbo...
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aef
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« Reply #18 on: March 08, 2024, 03:44:26 AM »
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Dont change KRKTE and dont change your fuel pressure.
KRKTE tells the ecu how big your injectors are. In your case @ 3bar fixed fuel pressure regulator.
Log a stock file and check your injector duty again. Most likely your fuel pump is stock, very old and your fuel filter is old and clogged too.
300hp on stock injectors is a facebook myth.
The higher your boost pressure is, the harder your fuelpump has to work.
Buy a DW65v Pump or some fake of this type of AWD fuel pump and install it properly so that every hose in your tank can keep up with 5bar (3+boost).
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prj
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« Reply #19 on: March 08, 2024, 04:10:34 AM »
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My experience with these injectors are that on pump fuel the max with a 4 bar fpr is 280hp.
With 3 bar fpr even less.
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vitali1411
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« Reply #20 on: March 08, 2024, 06:59:18 AM »
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What... Aiaiai  That's not what I wanted to hear. I use 98 to 102 Oct. |
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prj
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« Reply #21 on: March 08, 2024, 07:31:27 AM »
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You need bigger injectors and upgraded fuel pump if the turbo is not stock.
I would leave FPR alone.
If turbo is stock 4 bar fpr is enough, but you need to replace fuel pump with new one if it is still the original one.
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prj
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« Reply #22 on: March 08, 2024, 07:33:55 AM »
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Also if your gauge has analog output (I hope it does), then connect it instead of rear o2 sensor to rear o2 input, and configure ME7Logger to log it.
Then you can log AFR.
Or switch ECU to wideband for easier tuning.
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vitali1411
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« Reply #23 on: March 08, 2024, 12:10:47 PM »
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Okay, thought already about replacing ECU with BAM ECU.
I replaced following parts with new ones:
- MAF sensor
- Upgrade fuel pump Ultimate solutions US320-4
- ne fuel filter
- Lambda probe
- SUV
- pressure hoses/clanps
- 100cpi 3" DP
...
Puhhh I think with wideband it would be much easier...
Could get the inj on time a little bit lower but not below 22ms..
Another point is that Air mass doesn´t go over 220g/s.. Seems
I lowered KRKTE by 12,5% and set fuel pressure to 3,3bar @ atmosphere pressure
But if your suggestion is not to change fuel pressure, I will buy injectors. But which ones?
So trying to go on with ori injectors or use upgrade?
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nyet
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« Reply #24 on: March 08, 2024, 12:25:40 PM »
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That's not much better. Reduce boost until you get proper injectors.
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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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vitali1411
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« Reply #25 on: March 08, 2024, 12:30:03 PM »
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I´ll do |
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vitali1411
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« Reply #26 on: March 09, 2024, 06:23:37 AM »
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Hello again,
until the new injectors arrive (ordered 650ccm to be prepared for k04-064), I will try to unterstand the
ECU better.
I checked data from Bosch for fuel flow at 4bar, calculated KRKTE accordingly and set the FPR to 4 Bar.
Idling seems okay and inj. on time is around 20-22ms at 6000upm. Yes I understand... Injector are really maxed out.
But I still try to understand the boost curve. According to the log, WGDC should be set to 95% until ~3000 upm are reached. I did this and my Boost pressure gauge (measuring at intake manifold) shows an overshoot to ~1,8bar between 3000 and 3700 upm. Okay, max WGDC should be set shortly before 3000upm, means rescaling y-axis in KFLDIMX.
Why is the overshoot not visible in the log?
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vitali1411
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« Reply #27 on: March 09, 2024, 06:53:24 AM »
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And the log.
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prj
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« Reply #28 on: March 09, 2024, 09:28:34 AM »
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There is no control, of N75. Is CWMDAPP zero or not?
Also at 6000ms 20ms = constantly open. If it is 22 ms or 100 ms or any other value it does not change anything. 20ms = they never close, it is constant signal.
100% is your maximum duty cycle and above that no extra fuel is injected, so it goes lean.
You also have 0.72 lambda request up top. Probably it does not need that much.
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vitali1411
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« Reply #29 on: March 10, 2024, 04:20:28 AM »
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Thanks for all your answers.
I rechecked all my logs. there is one thing I´m really wondering about.
During spool shortly before reaching target boost, there is a straight line of actual boost (green circle). I thought this is under boost and I have to ajust KFLDIMX to reacht req. boost earlier.
But it´s the same in all logs and my Boost gauge says that boost is reached at that point in the red circle and from this point on the boost is regulated. No overshoot or something else.
So why is it not in the logs? Is there some dead time or switched of boost control in the ECU?
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