Im in the midle of testing oure new setup, have 11,8-11,9 A/F at 6300 rpm were the injectors maxes out, (60lbs mototron at 58psi FP no vac =to 70lbs?)
so the question is, Whats gonna hapend to the A/F if i add a few degrees timing? will it stay the same or will the more efficiant combustion indicate richer or leaner A/F
(planing to reise th FP a little more so i dont hit 100%DC)

LT1383 8,5 comp ported TFS ,Bret Bauer custom cam, F1SC 16-17 psi FMIC and water/etanol injection 93oct fuel.

ake eliasson

 

It won't make enough difference to matter.

rich

 

How does Methanol injection affect WBO2 readings? Do you still shoot for 12/1 or does Methanol/93 run best with a different ratio?

 

If you use lamda instead of AFR then it doesn't matter what fuel type you run. The Innovate LM1 lets you choose whether you view AFR or lamda.
So methanol would require a richer mixture, but if you were tuning with a wideband you would just tune for a .81 lamda (12:1 on gas) regardless of fuel type.

 

I already have a Tech Edge AFR:

http://www.techedge.com.au/vehicle/wbo2/default.htm

 

If the TechEdge lets you view lamda then you're all set.

 

Ok then it want go leaner, just have to try a litle higher FP then.
About the ALKY its 40% ethanol (not meth) 10% isopropanol and 50%water have tried it widh or widhout couldnt sea any bigger difference on the WB.
thanks

 

I dont understand this? Lamda and A/F are one in the same as far as I know.

.81 lambda = 11.90 A/F like you stated above

Lamda = Actual A/F divided by 14.7 ....correct me if I am wrong. Therefor, why does it matter if you view it on the display as 11.9 A/F or .81 lamda, they both mean the same.

 

Stoich = 1 lamda on any fuel. On gas an AFR of 14.7 = 1 lamda. Anything richer than 14.7 is a percentage of 1. The O2 sensor though does not care what fuel is being used.
So if you get used to using lamda and just tune for your particular best number you could add more methanol injection and still tune for your best lamda number without worry of percentages of different fuels. Does that make more sense?

 

Gotch ya. Thanks. I actually realized about two minutes after the post. The correct way to get the A/F displayed is to know the stoich for meth and for gas and what percent of the mixture is meth and what percent is gas. Then go from there on what the stoich should be in the equation. Or you can just go by the lambda. Thanks.

 

If your wideband allows you to view lamda, you don't have to know what percentages are what. Lamda is its native output, AFR requires the conversion. Kinda like HP and TQ. An engine dyno measures torque and the equation is applied to come up with horsepower.

 

Yeah, thats what I wrote at the end..."or you can just go by lamda". Good info.