GR Yaris Ethanol blends E85

Yes it's possible and becoming more common practice. You need 97% pure ethanol or greater ideally. I would keep to less than 1/3 ethanol myself as stock injectors will likely run out of duty at higher concentration.
 
The GR Corollas can be tuned up to E70 with stock fuel system on stock turbo. You’ll need to upgrade the stock port injectors if you want to run E70 with an upgraded turbo. The stock LPFP is honestly very good and does not need to be replaced :)
 
Ive worked with tuners that wont run injectors past 85% duty as the spray pattern goes to shit (Honda in this case). I'm also curious about how far the combined OE injector duty can be pushed on this platform.
 
Boosted8 said:
Yes it's possible and becoming more common practice. You need 97% pure ethanol or greater ideally. I would keep to less than 1/3 ethanol myself as stock injectors will likely run out of duty at higher concentration.
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This is super useful, thank you.

One more question. I'm guessing you put the ethanol first, then pump the gas to get a more uniform mixture? Or do you have to mix it in a separate container and then pump the mix into the tank?

I don't really like the idea of playing around with two highly flammable liquids lol.
 
I live 500m from a petrol station so put the ethanol in first then dump the gasoline on top.
 
For those that have run E30 or above with the stock tune - I understand in closed loop it will update tables based on lambda/fuel trims etc, but when in open loop, is the ECU using updated tables, or using a table that was designed for e5 and running lean? Do open loop tables update?
 
At WOT on the stock tune with premium fuel (assuming no short term knock correction is triggered) you will already be operating at the maximum allowed learned timing advance value. The default is 24. This means theres really no point adding octane if you are not knock limited.

Interestingly, I found I still had zero knock correction with the stock turbo pretty much maxed out (Valvesprings + cams + all the bolt-ons) So I was unable to create any benefit from adding Ethanol to 99ron, once again due to the maximum values being achieved.

So in summary, unless you have provision for a flex-fuel sensor and the ability to override max timing advance theres not really much point adding Ethanol. The only exception is maybe the situation where you can only get low quality pump fuel and you want to improve the detonation resistance by adding more E.
 
Boosted8 said:
The only exception is maybe the situation where you can only get low quality pump fuel and you want to improve the detonation resistance by adding more E.
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This is my situation. Curious if open loop tables are self updating.
 
I recently ran a tank which my in-line ethanol sensor reported as being E57. Lambda measured vs commanded never diverged much at all. Total fuel trim ran between +14 to 18%, which does seems lower than it should be which makes me think the ethanol was a bit lower than 57%, so further investigation is needed. My goal is to see if a fully stock car can handle E65 or higher without throwing or storing a code or blowing up.

On a side note, does anyone know how to monitor injector duty cycle? I don't see it in the OBD2 data and I think this is one of the most important things to monitor.
 
"On a side note, does anyone know how to monitor injector duty cycle? I don't see it in the OBD2 data and I think this is one of the most important things to monitor."
I've only ever done this with a DMM. From memory I connected straight to one of the injectors.
 
AHSwede said:
On a side note, does anyone know how to monitor injector duty cycle? I don't see it in the OBD2 data and I think this is one of the most important things to monitor.
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I see the following
  • Injection Mode
  • Injection Switching Status
  • Injection Volume (Total) (ml)
  • Injector Duty - Port
  • Injector Pulsewidth (Direct) (ms)
  • Injector Pulsewidth (Port) (ms)
Bit odd I get the port duty cycle but not the direct? Maybe I had that filtered out for some reason, will need to check next time I'm in the car.
 
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