Have a UAEFI, currently have it dialed in on E80. I have a flex fuel sensor installed, but when I go to anything lower, the car runs extremely rich.
I have my fuel characteristics put in as 14.7 for E0, and 9.0 for E100 as per the default. I do not have any blending tables setup though.
Is there a fuel model formula? Or would it be better to start tuning on E10/93, rather than going backwards?
Flex fuel tuning?
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benassi124
- Posts: 6
- Joined: Wed Sep 27, 2023 5:48 pm
Re: Flex fuel tuning?
Please post a log.
Is it extremely rich AFR or extremely rich in lambda.
Best practice in my experience is as follows:
Ensure you have ACCURATE Injector data, this is important, if you do not have this then do not pass go, do not collect 200 go straight to summitracing.com and order a proper set of injectors with data. This data is the heart of the calculation that makes flex fuel possible
Calibrate VE on E10 (Pump Gas) with anything that could affect your VE values disabled (Short Term Fuel Trim, LTFT, Acceleration Enrichment) then after you have calibrated VE on pump gas.
Enable the Flex Fuel Sensor.
Go to fuel --> injection configuration, define your primary and secondary stoichiometric ratios (Pump Gas typically 14.2 - 14.7 and then E100 typically 9.0)
At this point rusefi will, typically pretty accurately calculate the proper fueling to achieve your target lambda
At this point you should only be looking at Lambda.
Lambda is a unitless value that represents how rich or lean an engine is running compared to the ideal air-fuel ratio for complete combustion. A lambda value of 1.00 means the mixture is perfectly stoichiometric — just enough air to burn all the fuel. Values below 1.00 mean the mixture is rich (too much fuel), and values above 1.00 mean it’s lean (too much air). To convert lambda to AFR, multiply lambda by the stoichiometric AFR of the fuel you’re using
Is it extremely rich AFR or extremely rich in lambda.
Best practice in my experience is as follows:
Ensure you have ACCURATE Injector data, this is important, if you do not have this then do not pass go, do not collect 200 go straight to summitracing.com and order a proper set of injectors with data. This data is the heart of the calculation that makes flex fuel possible
Calibrate VE on E10 (Pump Gas) with anything that could affect your VE values disabled (Short Term Fuel Trim, LTFT, Acceleration Enrichment) then after you have calibrated VE on pump gas.
Enable the Flex Fuel Sensor.
Go to fuel --> injection configuration, define your primary and secondary stoichiometric ratios (Pump Gas typically 14.2 - 14.7 and then E100 typically 9.0)
At this point rusefi will, typically pretty accurately calculate the proper fueling to achieve your target lambda
At this point you should only be looking at Lambda.
Lambda is a unitless value that represents how rich or lean an engine is running compared to the ideal air-fuel ratio for complete combustion. A lambda value of 1.00 means the mixture is perfectly stoichiometric — just enough air to burn all the fuel. Values below 1.00 mean the mixture is rich (too much fuel), and values above 1.00 mean it’s lean (too much air). To convert lambda to AFR, multiply lambda by the stoichiometric AFR of the fuel you’re using