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- Nov 27, 2015
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- Torrance California
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- www.hondata.com
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- 23' Type R,22' Civic Si,18' Accord 2.0T,17' FK8
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Even with a stock vehicle on pump gas the fuel pump can run out of volume near peak torque. See https://www.civicx.com/threads/ctr-flashpro-tuning-fuel-pump.22786/ Tuning is a balancing act of getting the most engine power without running out of fuel pump. With ethanol the fuel pump tuning process is more important and more difficult.
With software update 3.3.8.0 we have added a feature that looks at the fuel pump duty and limits air charge to stop the fuel pump from running out. This will make things a lot easier for people running ethanol.
https://www.hondata.com/help/flashpro/fuel_pump.htm
It is normal for the pump duty to overshoot the target value, so the target value should be much below 100%. Ideally you want to pump to touch 100% but the fuel pressure not to drop. Since the fuel pump piston stroke is not linear from camshaft rotation even if you limit the fuel pump to 90% duty you are actually at 97.5% fuel pump flow.
In testing I found that values of 88% for the target and 88% for the hysteresis worked for our vehicles.
With software update 3.3.8.0 we have added a feature that looks at the fuel pump duty and limits air charge to stop the fuel pump from running out. This will make things a lot easier for people running ethanol.
https://www.hondata.com/help/flashpro/fuel_pump.htm
It is normal for the pump duty to overshoot the target value, so the target value should be much below 100%. Ideally you want to pump to touch 100% but the fuel pressure not to drop. Since the fuel pump piston stroke is not linear from camshaft rotation even if you limit the fuel pump to 90% duty you are actually at 97.5% fuel pump flow.
In testing I found that values of 88% for the target and 88% for the hysteresis worked for our vehicles.
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