Low e-85 Dyno Numbers

[West TX GT]

You were right! The dash shows 10.5. kind of disappointed that the ngauge dies not adjust.

Sponsored

 

[Poppacapp]

That's what I thought. I didn't want to seem a complete moron when asking them. I'm going to send them an email. Thanks for the info, guys.

Take a picture of you ngauge alc% and you afr reading. At 75% you should be in the low 10 range at idle

 

[JAS550]

If you even wanted to know what your air fuel ratio should be, you would use this formula:
(%ethanol) * 9.0078 + (%gasoline) * 14.64

So for example if you had E10 fuel in your car
0.10 * 9.0078 + .90 * 14.64 = 14.07678 AFR

IF you were to use E85
.85 * 9.0078 + .15 * 14.64 = 9.852 AFR

Im pretty sure that AFR's on the nguage are actually derived from LAMBDA values. Once the NGUAGE flags for E85 it will change displayed stoich to 9.8 vice 14.7, hence LAMBDA will remain close to 1 no matter what fuel you use.
That's why I display LAMBDA vice AFR on the Nguage.

 

[Poppacapp]

If you even wanted to know what your air fuel ratio should be, you would use this formula:
(%ethanol) * 9.0078 + (%gasoline) * 14.64

So for example if you had E10 fuel in your car
0.10 * 9.0078 + .90 * 14.64 = 14.07678 AFR

IF you were to use E85
.85 * 9.0078 + .15 * 14.64 = 9.852 AFR

Im pretty sure that AFR's on the nguage are actually derived from LAMBDA values. Once the NGUAGE flags for E85 it will change displayed stoich to 9.8 vice 14.7, hence LAMBDA will remain close to 1 no matter what fuel you use.
That's why I display LAMBDA vice AFR on the Nguage.

It's always better to use lambda vs afr... .85ish lambda is what I look for at WOT

 

[DetroitGT]

I've noticed this as well.. AFR on the nGauge is 14.7 with E85 or 93... The cars AFR gauge is 10 with E85 and 14.7 with 93... I trust the cars gauge for that reading.

 

[Burkcs]

I run e85 most of the time. I will throw a tank of 93 in every 5-6 fill ups. When I switch switch back to e85 I normally try get it to under 10 miles to empty. Its almost like playing a game.

Some observations, my car feels weak during the first tank when switching over to either 93 or e85. It only starts to feel strong again after the second tank.

I ran 3 tanks of 93 recently and when I went to fill up with e85 again it felt notably down on power. After the 2nd tank of e85 feels good again.

Sponsored