Tuning different fuels with same Lambdasensor

Im switching over now to use Lambda as tuning instead of AFR, this because im getting cars with etanol, e85, gasoline in the dyno.

Im thinking about using a lambdasensor configured for gasoline Lambda 1 = 14.7:1

When im mapping turbocharged engines i often do afr 12.5 or lambda 0.85

but if im to map e85 and e100(etanol) cars, what lambda would i aim for if i still use the same lambdasensor configured for gasoline?

Ok first of all you don't configure a lambda sensor for lambda 1 = X. Lambda 1.00 is always stoichiometric regardless of the fuel you're running on. It actually works the other way around and if you want to display AFR units then you need to set the stoich ratio to suit the fuel you're running (this is the step many tuners miss when changing fuels btw).

The actual lambda target you use will still vary from fuel to fuel. For example I tend to use similar lambda targets between pump fuel, E85 and E100. As a rough ball park this might be in the range of 0.78-0.82 depending on the specifics of the engine, boost level, and how the engine will be used. On the other hand you'll need to target much richer lambda values if you were to run methanol.

in other words, i would look for the same lambda target regardless of fuel?

what would be the ideal target for instance an 6 cylindre engine, boosted 1.5 bar, 8,8:1 compratio and approx 800 horsepower ?

i would look for 0.78 no mather what the fuel/AFR lambda sensor is set to read?

That's correct.

I need to just clarify here - It's not accurate to say you'd target the same lambda regardless of fuel. While you will get good results in most instances using a similar lambda target between E0, E30, E85 and E100 for example, if you tried using this same lambda target on methanol you'd end up with a bunch of melted parts. Methanol is however a reasonably unique fuel and out on its own somewhat in terms of tuning requirements.

there are people using .72 lambda on methanol m5