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Old 03-17-2016, 06:36 PM   #29
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Originally Posted by Toyota86.ir View Post
I do not tune myself and i just like to know e85 calculation in ecutek
The fueling calculations are done by the ecu

Ecutek like romraider or ecuflash is just a system to alter the parameters (tables) so you can change the input parameters to these calculations.

Ecutek does add some extra code to ecu, but unless your using speed density fueling, your likely using the standard fueling as calculated by the ecu


This would not be a simple calculation as the ecu looks ant many inputs including MAF , and many tables in the ecu to arrive at the amount of fuel its going to inject via the two fueling systems.


If you wanted your car to run on E85 all you need to do is alter the port and direct injector "scaling/pressure multipliers, so the ecu would inject 30% more fuel, the calculation the ecu would perform is the same but you "fooled" the ecu into injecting 30% more fuel as you want to run E85. Compare the OFT petrol and E85 tunes, thats all that done fueling wise. Ecutek its basicly same thing

Last edited by steve99; 03-17-2016 at 07:04 PM.
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Old 03-18-2016, 06:01 AM   #30
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Quote:
Originally Posted by steve99 View Post
The fueling calculations are done by the ecu

Ecutek like romraider or ecuflash is just a system to alter the parameters (tables) so you can change the input parameters to these calculations.

Ecutek does add some extra code to ecu, but unless your using speed density fueling, your likely using the standard fueling as calculated by the ecu


This would not be a simple calculation as the ecu looks ant many inputs including MAF , and many tables in the ecu to arrive at the amount of fuel its going to inject via the two fueling systems.


If you wanted your car to run on E85 all you need to do is alter the port and direct injector "scaling/pressure multipliers, so the ecu would inject 30% more fuel, the calculation the ecu would perform is the same but you "fooled" the ecu into injecting 30% more fuel as you want to run E85. Compare the OFT petrol and E85 tunes, thats all that done fueling wise. Ecutek its basicly same thing
If we tune E85 the ecutek is just a tool but i guess flexfuel feature in ecutek has internal calculation for E85.

Please check the link :
https://www.versatuner.com/E85TuningGuide.aspx
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Old 03-18-2016, 06:42 AM   #31
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Originally Posted by Toyota86.ir View Post
If we tune E85 the ecutek is just a tool but i guess flexfuel feature in ecutek has internal calculation for E85.

Please check the link :
https://www.versatuner.com/E85TuningGuide.aspx
The flexfuel calculations are just custom maps setup by the tuner. I would expect that there is one table to multiply the fuel, one for cranking and one to adjust timing. ECUtek themselves don't have a specific E85/Flex setup.

There are some general rule of thumbs for fueling E85 so creating a flex tune would be a rather simple task of interpolating values between petrol and E85.
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Old 03-18-2016, 06:54 AM   #32
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The flexfuel calculations are just custom maps setup by the tuner. I would expect that there is one table to multiply the fuel, one for cranking and one to adjust timing. ECUtek themselves don't have a specific E85/Flex setup.

There are some general rule of thumbs for fueling E85 so creating a flex tune would be a rather simple task of interpolating values between petrol and E85.

I ask the question because in my city there is no E85 station and i should manualy mix gasoline/ethanol by weighting them in a accurate ratio.
Ethanol weight should be 6.0-6.3 more than gasoline in my E85 calculation
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Old 03-18-2016, 07:04 AM   #33
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Originally Posted by Toyota86.ir View Post
If we tune E85 the ecutek is just a tool but i guess flexfuel feature in ecutek has internal calculation for E85.

Please check the link :
https://www.versatuner.com/E85TuningGuide.aspx

my firewall is blocking that link but will try again later :-)




Flex sensors tap into fuel line and measure ethanol content of fuel, most will put out a variable frequency signal depending on ethanol content. you then need another control box to convert that variable frequency signal to a 0 to 5volts DC level depending on ethanol content.


That signal is fed into an unused or re-purposed ECU sensor input. Extra software in the ECU (ecutek or opensource) then uses this 0 to 5v and will use this input to calculate the offsets required to the fueling and timing tables in the ECU to run anthing from straight petrol to E85.


I believe they just use the standard fueling and timing calculation the standard ecu uses but just apply correction factors to achieve the desired result.


If you want a greater insight into this suggest you read ztans thread on opensource flex fuel, he has actually written ecu code changes to run flex fuel without ecutek.


http://www.ft86club.com/forums/showthread.php?t=94751
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Old 03-18-2016, 07:55 AM   #34
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Originally Posted by Toyota86.ir View Post
I ask the question because in my city there is no E85 station and i should manualy mix gasoline/ethanol by weighting them in a accurate ratio.
Ethanol weight should be 6.0-6.3 more than gasoline in my E85 calculation


The specific gravity of ethanol and gasoline is almost the same


http://www.engineeringtoolbox.com/sp...ids-d_336.html


so if you want E70 just mix it 7 litres ethanol to 3 litres gasoline


If you have a flex kit anything between about E60 and E90 will produce max power on an NA car and still start ok on a cold morning.
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Old 03-18-2016, 02:27 PM   #35
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Originally Posted by steve99 View Post
The specific gravity of ethanol and gasoline is almost the same


http://www.engineeringtoolbox.com/sp...ids-d_336.html


so if you want E70 just mix it 7 litres ethanol to 3 litres gasoline


If you have a flex kit anything between about E60 and E90 will produce max power on an NA car and still start ok on a cold morning.
I measured density of ethanol , gasoline 87ron and gasoline 92ron and all were different.

I do not think their density be equal
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Old 03-18-2016, 08:25 PM   #36
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I measured density of ethanol , gasoline 87ron and gasoline 92ron and all were different.

I do not think their density be equal
You have a flex fuel kit correct and a ecutek flex fuel tune. You dont need to do any of that stuff that in that vera tune link its all sorted for you
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