E85 Chip question for Extender Extreme G and TurboTweak

[CGASTON]

Since gas chips are designed to read in lambda and lambda = 1= a stoich of 14.7 A/F for gasoline, are the E-85 chips made to read lambda = 1=stoich of 9.8 A/F? I am wondering if this is done? Thus making it easier tuning and wideband logging. Having to convert gas stoich to E85 stoich can be an PITA.......

 

[Eric Stage I]

There is no reason to convert. You can use the same A/F numbers you did for gas as a starting point, if you're using a wideband that reads on the gasoline scale.
Lambda is the same for either. It's just the gauge that converts it to an A/F.

 

[CGASTON]

There is no reason to convert. You can use the same A/F numbers you did for gas as a starting point, if you're using a wideband that reads on the gasoline scale.
Lambda is the same for either. It's just the gauge that converts it to an A/F.

Eric,

I understand that the Lambda is the same, but the stoich is different. So do I measure E85 at 14.7? This should be the equal medium, but a believe a little rich. Especially at idle.

 

[Eric Stage I]

When you see 14.7 on a wideband A/F scaled for gas, then you are at stoich for gas or E85, or any fuel (lamda of 1). For a turbo Buick, I prefer to idle them around 12.5-13.5 A/F in most cases.

Make sense?

 

[CGASTON]

yes..... So then would 12.5 be a little lean? Run WOT at 10.5? E85

 

[Eric Stage I]

12.5 at WOT would be lean, I would try for around 11.0 as a good starting point. Then go up or down from there to see what the car likes.

 

[CGASTON]

So even at idle, the A/F of 13.5 is lean as well?

 

[Eric Stage I]

No, that would be ok at idle for most cars.