Just wondering what AFR are you guys at with alky (50/50)? Gas = 14.7/1 and MeOH = 6 to 7/1............and its a 4.9gph nozzle spraying @10psi?

 

The affect on the AFR when injecting alcohol depends on several factors:

(1) Starting AFR
(2) Rate of injection
(3) Percentage of alcohol in the mix

At any case, you'd ideally want to tune the fuel mixture such that you run about the same AFR with alcohol injection as you do without it.

 

X2

 

i thought you could run quite a bit leaner with alcohol/water injection????

 

It might be clearer to say the same lambda.

Dave

 

My understanding is that you could get away with running leaner due to the cooling benefit of methanol. This is however very dangerous because if the pump fails and you are very lean and running high boost ...BLAMO! At least if you are on the rich side you would have half a chance of not blowing it up. There is a thread somewhere about a guy who's controller failed during a track event and the car did not blow up b/c it was tuned nice and rich.

 

In order to make the fullest gains of an alky system you have to run so much alky and pull so much fuel that if the pump does fail, youre screwed. Anyone who tells you otherwise isn't tuning the alcohol to it's fullest extent.