RON95 + Ethanol Mix = E15 Tuning

[halujeddo]

Hi everyone,

In my country, I have no access to 91/93 AKI gas.

If I compare the logs of my car and the cars located in US, our best RON95 gas runs like 87 AKI; definetely less than 89 AKI.

After tons of logs and flashes, I've done very good tune for my country and the gas we can access. There is no problem about this. I keep my IAM at 1.00 most of the time. Of course it is slower than the ones running with 93 AKI, but at least healthy and gained all the power it could with this gas.

My next project is E15 tuning. I will put 15% ethanol into tank. It would be around 92 AKI.

My question is how should I increase fueling in the tune file.

Option 1: Multiply all the maf scale by 1.07 . But it will change loads, load limits as well, ignition timings as well etc.

Option 2: Multiply GDI Pressure tables by 1.07.

Option 3: Multiply both at the numbers 1.03 and 1.04

I don't know if there is option 4. Please let me know if exist.

[steve99]

Originally Posted by halujeddo

Hi everyone,

In my country, I have no access to 91/93 AKI gas.

If I compare the logs of my car and the cars located in US, our best RON95 gas runs like 87 AKI; definetely less than 89 AKI.

After tons of logs and flashes, I've done very good tune for my country and the gas we can access. There is no problem about this. I keep my IAM at 1.00 most of the time. Of course it is slower than the ones running with 93 AKI, but at least healthy and gained all the power it could with this gas.

My next project is E15 tuning. I will put 15% ethanol into tank. It would be around 92 AKI.

My question is how should I increase fueling in the tune file.

Option 1: Multiply all the maf scale by 1.07 . But it will change loads, load limits as well, ignition timings as well etc.

Option 2: Multiply GDI Pressure tables by 1.07.

Option 3: Multiply both at the numbers 1.03 and 1.04

I don't know if there is option 4. Please let me know if exist.

As per the oft e85 tunes you need to increase the gdi pressure tables and also alter the port injector scale r to account for the ethanol.


So as you said about 7% increse on the gdi pressure and then Reduce the port scaler called Injectpr scaling BRZ by 7% or whatever amount you changed the gdi.


Reducing the port scaler makes the ecu think its got smaller port injectors so it will increase open times to compensate and increase port fueling by 7%


You should then not need to change maf scale and ltft should be fairly low