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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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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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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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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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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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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