## E85 lambda chart

Does anyone have a chart of what lambda represents on a chart vs AFR Having the car on E85 and I will only tune it on lambda now, but i need a conversion chart so I have an idea what the numbers mean. The wideband doesn't care or know what fuel it is reading and it actually reads natively in lambda - Or to be more accurate if there is an excess of hydrocarbons or oxygen in the exhaust. So a reading of 11.5:1 on E85 with a stoich setting of 14.7:1 would actually be a lambda of 0.78. I currently use 9.87 for Stoich with E85, Running on the united pump E85. Theoretically your target lambda in the base fuel table doesnt need to change. I was running .79-.78 uptop on pump 98 but Ive heard if guys lifting cylinder heads at that lambda or richer with big boost ie25psi and above.

I made a quick video explaining what is needed for flex fuel tunes, how to let the car learn the ethanol content, and what to expect from the tunes. There are a lot of misconceptions about the The thing to note is that the WBO2 may read 14.7:1 AFR on E85, when in reality the actual AFR is 9.8:1 due to the stoichiometric ratio differences between the two fuels. The best way to read AFR when using alternative fuels is Lambda. 1.0 lambda on gasoline is 1.0 lambda on E85 (1.0 lambda = 14.7:1 with gasoline. 1.0 lambda = 9.8:1 with E85). A more precise way to tune is either by measuring and controlling air/fuel ratio (AFR) or by measuring and controlling lambda. This is how electronic fuel injection (EFI) tuning works. Racing mechanical fuel injection tuning and carburetor tuning can work that way also. Sprint car engines run AFRs from 6 to 1 down to 3.4 to 1 depending on the For a great software program try Larry Meaux's Pipe Max. His program is excellent and will provide a lot of info. Pipe Max. Back to Calculators Index These equations are for recreation only.

## I believe stioch is 9.0 AFR on E85, but what do I tune to for WOT on a forced induction engine? How could I convert that AFR into Lambda sinc my gague does not read below 11.0?

### The wideband doesn't care or know what fuel it is reading and it actually reads natively in lambda - Or to be more accurate if there is an excess of hydrocarbons or oxygen in the exhaust. So a reading of 11.5:1 on E85 with a stoich setting of 14.7:1 would actually be a lambda of 0.78.

For a great software program try Larry Meaux's Pipe Max. His program is excellent and will provide a lot of info. Pipe Max. Back to Calculators Index These equations are for recreation only. The Basics of Air Fuel Ratio What is lambda, and the difference between narrow band and wide band 02 sensors? Contributed By: Enginebasics.com. One the most important aspects of the combustion motor is the air to fuel ratio in the cylinder. Like all things that explode, having the proper amount of combustible fuel to the amount of air to

### These parameters define various volatility classes (Table 3 in EN 228) that vary 90°C. When using fuels with higher E70 values, about 10% richer lambda CRC (2006) Fuel permeation from automotive systems: E0, E6, E10, E20 and E85.

6 Oct 2017 The stoichiometric ratio of E85 is 9.765. However, E85 is rarely the 85% ethanol, 15% gasoline mix it claims to be. For that reason, its stoich can  For example if your running straight E85 with a lambda of 0.88 your going to Substitute: (O2 output * .00024414) * 14.7 = AFR (value in table), look familiar?

## 16 Nov 2006 Im in no way the end all/know all about e85, but I know there is a decent a thread on e85 lambda: e85 = blue graph , 91 = red graph

The wideband O2 sensor, actually reads the fuel air mixture in terms of Lambda and then internally computes (converts it to) a gasoline calibrated

Stoich for any fuel is Lambda 1.0 Most users find that in closed loop, the wideband will report Lambda 0.98 -1.02 regardless of fuel (if the ECU has enough fuel trim authority to get back to stoich). Most of us shoot for a Lambda of about 0.78 - 0.85 on E85. The target lambda on E85/E98 is similar to what I aim for on pump fuel so you should have been in the ball park at 0.82. This is possibly marginally on the lean side and you might be better running around 0.80 - You won't lose any power but it will help reduce combustion temperature. 7.6 E85 AFR = 11.5 Gasoline AFR =.8 Lambda.” In racing applications, stoich is very rare. Under load, an engine is usually tuned between 15% – 25 % richer than stoichiometric. They will fatten or richen up the fuel mixture to pack a little more energy potential into the engine. Normal aspirated application. For what i've seeing online, max power rich for gas is .85 lambda and max power lean is .90 lambda max power rich for E85 is .71 lambda and max power lean is .86 lambda I'm pretty conservative in my tunes, so i shoot for .85 lambda on gas all the time. not because i've read about it, but because all my cars had always run better at .85 compared to .90 at WOT