Will_
Autocross Champion
- Location
- SF Bay Area
- Car(s)
- 2017 GTI S DSG
E20-E25 is not a 20-30% difference in fueling. More like 10%
So moral of the story I should be fine running an E20-E25 blend even on a off the shelf 91 octane tune?
E20-E25 is not a 20-30% difference in fueling. More like 10%
Understood but 20-30% is on the edge before the long term fuel trims adjust.
Advanced engine design and development engine dyno engineer.
So moral of the story I should be fine running an E20-E25 blend even on a off the shelf 91 octane tune?
I didn't say it was a 20-30% change in fueling, Will said he was using an E 20-30% blend.
It will only be fine if the short term fuel trims can compensate long enough for the long term fuel trims to adjust for the extra fuel required. Otherwise during the transition period the engine will be lean causing detonation requiring the knock system to pull additional timing from the engine lowering power even more.
I'm getting my info. from over 10,000 hours of performing WOT engine dyno calibration for auto makers, turbo makers and race teams.
You won't get knock from going lean. A DI motor can run safely at 0.78-0.88 lambda and all files from the big companies run close to 0.8.
Not only that, the detonation resistance on ethanol is through the roof.
I'm sure you are knowledgeable, just maybe not about this platform.
You won't get knock from going lean. A DI motor can run safely at 0.78-0.88 lambda and all files from the big companies run close to 0.8.
Not only that, the detonation resistance on ethanol is through the roof.
I'm sure you are knowledgeable, just maybe not about this platform.
20-30% fueling adjustment to go from E10 to E25?
Ed was being generous when he said more like 10%.
Some of your posts really make me question your signature:
Please don't post nonsense when you don't have a clue what you are talking about. A lean condition can knock regardless with an E20-30 blend which does not raise the octane substantially over the base 91 octane Will is using.
Please don't post nonsense when you don't have a clue what you are talking about. A lean condition can knock regardless with an E20-30 blend which does not raise the octane substantially over the base 91 octane Will is using.