q_dubz
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« on: April 23, 2019, 06:20:05 AM »
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- 4.163L V8
- Bosch MS 980cc
- 4bar base
- Previous injectors were Bosch 630cc (KRKTE: .058xx)
Calculated value for the given pressure was .032xx Set to .038xx and partial LTFT are still calling for almost 16% and 19% more! This would result in around .045xx I'm guessing it's time for FKKVS fixer? |
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nyet
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« Reply #1 on: April 23, 2019, 08:34:20 AM »
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If theoretical KRKTE does not work, fixing it via FKKVS is probably the worst possible "solution".
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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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q_dubz
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« Reply #2 on: April 23, 2019, 11:20:42 AM »
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If theoretical KRKTE does not work, fixing it via FKKVS is probably the worst possible "solution".
ok I misunderstood it's purpose then. |
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nyet
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« Reply #3 on: April 23, 2019, 11:26:24 AM »
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If your trims are off by more than 15% with the correct theoretical KRKTE something else is very, very wrong.
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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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q_dubz
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« Reply #4 on: April 23, 2019, 11:50:09 AM »
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If your trims are off by more than 15% with the correct theoretical KRKTE something else is very, very wrong.
I completely agree, hence why I posted. I'm looking for ideas. I'm going to wire in an electric fuel pressure gauge so I can log it. But I imagine if that were a problem injector duty would certainly show it.... Hmm |
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nyet
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« Reply #5 on: April 23, 2019, 12:03:03 PM »
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I completely agree, hence why I posted. I'm looking for ideas. I'm going to wire in an electric fuel pressure gauge so I can log it. But I imagine if that were a problem injector duty would certainly show it.... Hmm
Injector duty "shows" it when the ECU requests way more fuel than you'd expect due to.. drum roll.... trims  |
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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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q_dubz
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« Reply #6 on: April 23, 2019, 10:31:12 PM »
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Injector duty "shows" it when the ECU requests way more fuel than you'd expect due to.. drum roll.... trims well here's a shot of fra_w (RED) vs fr_w (BLUE) vs throttle and another with injector duty. Maybe you're right... |
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nyet
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« Reply #7 on: April 23, 2019, 10:50:09 PM »
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What other mechanism would the ECU use to increase injector time if the O2 sensors say lean?
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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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q_dubz
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« Reply #8 on: April 25, 2019, 09:50:06 AM »
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What other mechanism would the ECU use to increase injector time if the O2 sensors say lean?
I dunno but I'll read thru the FR and find out. The reason I posted this is because lambda control (fr_w) is taking away fuel, especially under WOT. Completely contradicts the work fra_w is doing which I understand happens BEFORE lambda control kicks in. |
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Blazius
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« Reply #9 on: April 25, 2019, 11:10:16 AM »
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I dunno but I'll read thru the FR and find out.
The reason I posted this is because lambda control (fr_w) is taking away fuel, especially under WOT. Completely contradicts the work fra_w is doing which I understand happens BEFORE lambda control kicks in.
wot? there is no lamba control on wot? |
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nyet
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« Reply #10 on: April 25, 2019, 11:15:11 AM »
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wot? there is no lamba control on wot?
depends if narrowband or wideband |
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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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q_dubz
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« Reply #11 on: April 25, 2019, 12:52:07 PM »
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wot? there is no lamba control on wot?
wideband car. |
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