10-23-2020, 10:27 PM | #1 |
Lieutenant
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Rep 471
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Fuel Trims and AFRs
Hey guys, can anyone tell me what are the key numbers to look at on logs when it starts to be an issue (running out of fuel) on higher boost maps? JB4 BCM here with map 1 and 2 with 93 and oct booster. I’d like to understand the logs better and see what are the critical numbers. Thanks!
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10-24-2020, 08:50 AM | #2 |
Private First Class
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Rep 175
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My LTFTs fluctuate between -10 and 10. I think that fuel trims max out beyond -20/20 but I'll leave it to the experts to guide you. My AFRs in stock form and with a flash will run from about 14.7 at 4,500 rpm to high 12s at 7,000rpm. My tune makes a good deal of extra power (about 65 whp and 150 nm) but not sure how this was achieved as the maximum increase over stock boost is about 2.5psi at about 5,000rpm while boost tapers off to the stock levels from 6,500 rpm to the top
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