stevieturbo

I know its maybe been covered before to an extent.

But was there ever any sort of definative guide, as to how AFR's change when injecting methanol, and how it will affect your tuning when using a Bosch sensor based Wideband ?

Say if 11.5:1 AFR is regarded as safe on pump fuel. What would be a safe target to aim for if squirting say 10% methanol ( 10% in relation to the quantity of pump fuel used )

How much meth is too much ?? say 15%, 20% ?

I see mention on the Innovate forum, that if you tune for Lambda rather than AFR's, then targets would stay the same ??

Is that correct ? So would aiming for say 0.8 Lambda be a safe bet ? ( safe and making power )

engineermike

If 11.5/1 is your goal on pump gas, it should be your goal on Methanol also. If you were running straight Methanol, it would still be 11.5/1. You see, ALL widebands meausure Lambda. Most simply convert the Lambda number (i.e. .75) into an A/F ratio, but have to assume a fuel (gasoline in most cases). If you run some Methanol, the WBO2 doesn't know this and still displays 11.5/1 when it reads a lambda of .75. If you were to reprogram the WBO2 for Methanol use, then it would display 6/1 at the same lambda of .75. Confusing, I know.

I don't think you can run "too much Methanol". 100% would be best for power. Some Turbo Buick and DSM guys are running 50% Meth 50% 93 at over 30 psi boost.

Mike