Flex fuel kit

brainrain · 06-18-2019, 08:39 AM

Hi everybody,

I contact my mapper about flexfuel tune, he says that e85 sensor it’s not necessary, the lambda probe is there to analyse the fuel.
Injector gtr it is not necessary for flexfuel tune without performance gain.

What do you think about it ?

Chuck33079 · 06-18-2019, 09:02 AM

Quote:

Originally Posted by brainrain

Hi everybody,

I contact my mapper about flexfuel tune, he says that e85 sensor it’s not necessary, the lambda probe is there to analyse the fuel.
Injector gtr it is not necessary for flexfuel tune without performance gain.

What do you think about it ?

I think he's directly contradicting a lot of people's experiences here.

phunk · 06-18-2019, 02:24 PM

The very function of the FlexFuel feature is to detect the ethanol content and adjust the calibration around it. The 2 absolutely necessary components of FlexFuel is the sensor and engine control software that is using the data from this sensor.

You CAN run E85 without FlexFuel, but its not called FlexFuel, its just called running E85. Its a separate tune, sort of like you would use for high octane race gas.

As for running stock injectors with E85, never tried it. But arent stock injectors like 310cc? Anyone know? If so, that is too small for E85.

Quicksilvers · 06-18-2019, 09:33 PM

Quote:

Originally Posted by phunk

The very function of the FlexFuel feature is to detect the ethanol content and adjust the calibration around it. The 2 absolutely necessary components of FlexFuel is the sensor and engine control software that is using the data from this sensor.

You CAN run E85 without FlexFuel, but its not called FlexFuel, its just called running E85. Its a separate tune, sort of like you would use for high octane race gas.

As for running stock injectors with E85, never tried it. But arent stock injectors like 310cc? Anyone know? If so, that is too small for E85.

If the math is done here it comes to be a minimum of 384cc/or 37 lb fuel injectors. When running E85 with the stock fuel injectors a DTC will appear as not enough fuel volume will be available to use because the stock fuel injector size is too small to run E85. You will need 550cc or larger fuel injectors and upgrading to a larger fuel pump is cheap insurance as I have seen several people have their stock fuel pumps fail after upgrading their fuel injectors,running E85,and not upgrading their fuel pump at the same time.

Chuck33079 · 06-19-2019, 06:28 AM

Are you seriously "informing" phunk about fuel systems? Are you high?

phunk · 06-19-2019, 03:07 PM

Well, credit where due, I learned the stock fuel injector size

Ive seen it 100 times but I will never remember since we never use them.. by the time I am working with a customer they are out of the equation.

BlackZBunny · 08-21-2020, 12:50 AM

Is it possible to run a toggle switch for the evap sensor/flex fuel sensor? So when it comes around to smog time, I can just flip a switch and reflash the ecu to smog?

California T.T

redondoaveb · 08-21-2020, 01:04 AM

Quote:

Originally Posted by BlackZBunny

Is it possible to run a toggle switch for the evap sensor/flex fuel sensor? So when it comes around to smog time, I can just flip a switch and reflash the ecu to smog?

California T.T

When I run a scan, it shows evap system monitors not ready. My smog guy told me that won't affect the smog test.

06-18-2019, 02:24 PM	#48 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	The very function of the FlexFuel feature is to detect the ethanol content and adjust the calibration around it. The 2 absolutely necessary components of FlexFuel is the sensor and engine control software that is using the data from this sensor. You CAN run E85 without FlexFuel, but its not called FlexFuel, its just called running E85. Its a separate tune, sort of like you would use for high octane race gas. As for running stock injectors with E85, never tried it. But arent stock injectors like 310cc? Anyone know? If so, that is too small for E85. The Weapon, jwick, Rusty and 4 others like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

06-19-2019, 06:28 AM	#50 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Are you seriously "informing" phunk about fuel systems? Are you high? jwick, Rusty, madwi and 4 others like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

06-19-2019, 03:07 PM	#51 (permalink)
phunk A True Z Fanatic Join Date: Mar 2009 Location: Chicago Posts: 3,668 Drives: 370 Rep Power: 974723	Well, credit where due, I learned the stock fuel injector size Ive seen it 100 times but I will never remember since we never use them.. by the time I am working with a customer they are out of the equation. Rusty, Spooler and Quicksilvers like this. __________________ Charles @ CJ Motorsports : Website \| Facebook \| Instagram \| YouTube Home of the 9 second, stock longblock, stock drivetrain 6MT 370z. 9.91 @ 142mph

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06-18-2019, 08:39 AM	#46 (permalink)
brainrain Base Member Join Date: May 2019 Location: Paris Posts: 77 Drives: Nissan 370z Rep Power: 6	Hi everybody, I contact my mapper about flexfuel tune, he says that e85 sensor it’s not necessary, the lambda probe is there to analyse the fuel. Injector gtr it is not necessary for flexfuel tune without performance gain. What do you think about it ?

08-21-2020, 12:50 AM	#52 (permalink)
BlackZBunny Base Member Join Date: Mar 2016 Location: Bay Area Posts: 67 Drives: 09 Nissan 370z AT7 Rep Power: 9	Is it possible to run a toggle switch for the evap sensor/flex fuel sensor? So when it comes around to smog time, I can just flip a switch and reflash the ecu to smog? California T.T