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03-16-2014, 06:21 AM | #1 |
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Fuelling Issues (ECUtek ROM)
I thought I'd share some symptoms and asks for ideas and advice from some of the more experienced. 2 issues not related but occurring at similar RPM.
1st of all the PI seems to cut off for a brief period. It has no impact on the resultant AFR so it's not an issue but it's a tad strange. The PI/DI ratio table is as below: But this is the injector open times: Any ideas? The other issue is that the car goes lean momentarily between 4.2-4.6k: You can see the commanded AFR. The point it goes lean is bang in the middle of 2 MAF scalar points, the voltage points sit almost exactly at 4.2 and 4.6k RPM, so it's not a MAF issue. My initial thought is that as both intake and exhaust cams ramp up then the overlap increases as below: My questions: - Is the AFR actually true? You can see from the top images that the fuelling hasn't changed through that range. Is there a chance that the overlap is causing fresh air charge going through the cylinder causing leaner readings? - Could the PI/DI ratio have an impact? I've moved the ratio back to stock from the tables above. The PI is showing as 50% in that range, but OEM is 100% DI. Could that help? - Would just enriching out the fuelling table at 4400 be the right way to improve this? Any other ideas?
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03-16-2014, 06:58 AM | #2 |
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The PI shut down but the fuelling is added via the direct injectors.
The switching between injectors is as the car was tuned from the factory. |
03-16-2014, 03:22 PM | #3 | |
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Quote:
For reference the cold map is stock, the warm and hot maps are both as the lower map shown.
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03-16-2014, 11:50 PM | #4 |
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What's the load being logged when this happens?
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03-17-2014, 04:13 AM | #5 |
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