Kacpern
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« on: June 15, 2024, 02:22:04 AM »
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Good morning. I wanted to ask what causes silting when the throttle is fully depressed in naturally aspirated petrol engines of the Golf 4. When the gas pedal is depressed at 75% it drives much better than at 100%. Other users confirm this too. I have a 2.0 AZJ with a broadband probe and this problem also occurs even though there is a broadband probe. It gets too much fuel when you press the gas pedal at 100% and it floods, or is there any other reason?
Lambda 0.899
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_nameless
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« Reply #1 on: June 15, 2024, 03:20:43 AM »
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Good morning. I wanted to ask what causes silting when the throttle is fully depressed in naturally aspirated petrol engines of the Golf 4. When the gas pedal is depressed at 75% it drives much better than at 100%. Other users confirm this too. I have a 2.0 AZJ with a broadband probe and this problem also occurs even though there is a broadband probe. It gets too much fuel when you press the gas pedal at 100% and it floods, or is there any other reason?
Lambda 0.899
Few things. Data log mixtures at full throttle and part throttle, do the same with ignition timing. Also, velocity equals torque, 75% could be helping you make more lol |
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If you are broke or expecting free handouts DO NOT message me. I'll probably put you on blast if you do.
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Kacpern
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« Reply #2 on: June 15, 2024, 04:03:22 AM »
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Also, velocity equals torque, 75% could be helping you make more lol  ?? |
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_nameless
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« Reply #3 on: June 15, 2024, 07:37:02 AM »
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Also, velocity equals torque, 75% could be helping you make more lol ?? Air velocity and torque: Air velocity and volume flow Air velocity is the rate at which air or gas moves in a specific location, usually measured in feet per minute (FPM). You can calculate the volume of air flowing past a point in a duct by multiplying the air velocity by the duct's cross-sectional area, which is usually measured in cubic feet per minute (CFM). Air velocity and torque in engines For good throttle response and torque, street cruising engines need high air velocity below 4,000 rpm. Smaller intake runners and valves can help achieve this higher velocity. Air charge and torque The air charge into an engine's cylinders is a function of the engine speed and the mass air flow rate into the cylinders, and it's directly related to the torque produced during the power stroke. |
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If you are broke or expecting free handouts DO NOT message me. I'll probably put you on blast if you do.
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Kacpern
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« Reply #4 on: June 15, 2024, 12:09:52 PM »
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Isn't it a problem that it is flooded with fuel? With 100% pressure on the gas pedal, lambda is 0.899 With 75% gas pedal pressure lambda 1
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prj
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« Reply #5 on: June 16, 2024, 02:23:31 AM »
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I love the assumptions before making any measurements.
"Drives better" how - did you make acceleration measurements?
Did you put the car on a dyno and actually measure the torque curve?
Until that's done, any further discussion is a complete waste of time.
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cherry
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« Reply #6 on: June 16, 2024, 03:04:54 PM »
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Make some logs and check what is happening. Normally lambda 0,9 produce more power than 1,0. I had some other car with wrong MAF sensor, the fuel part was good through adaption (measured value 32.2 +10%), but the car was running too much ignition due too low measured load, there was knock then. The load part caused through bad MAF is not adapted, so maybe your MAF is defective and you have knock issues in WOT. Anyway i had the issue with 1.8t, never worked much with such na engine...
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nyet
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« Reply #7 on: June 16, 2024, 10:15:26 PM »
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log don't guess. this thread is pointless w/o data
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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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Kacpern
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« Reply #8 on: November 13, 2024, 05:23:28 AM »
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The reason for this is that up to 3000 rpm the throttle is blocked in the map and does not open fully to 100%.
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Kacpern
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« Reply #10 on: November 14, 2024, 07:22:50 AM »
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It has no boost pressure. This is N/A
It has no ESP
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IamwhoIam
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« Reply #11 on: November 14, 2024, 08:07:08 AM »
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Where are your logs proving your "feelings"?
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I have no logs because I have a boost gauge (makes things easier)
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Kacpern
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« Reply #12 on: December 10, 2024, 02:15:50 PM »
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At the top, press the gas at 70%, you can feel and hear the engine pulling.
At the bottom, the gas pedal is pressed 100% to the stop, the sludge is getting weaker, and the engine roar is no longer heard. Well, it's getting muddy and that's it.
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prj
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« Reply #13 on: December 10, 2024, 04:05:04 PM »
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And in both cases your shitbox accelerates exactly the same.
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Kacpern
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« Reply #14 on: January 26, 2025, 12:07:04 PM »
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When the accelerator pedal is fully depressed, it accelerates much worse.
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