Original 2005 thread: https://ls1tech.com/forums/forced-in...e-cracked.html

So I found my old spreadsheet today and loaded it back up.
I had over the years been getting notices of access attempts and dismissing them with the file lost (sorry!).
Many things have changed but I am still a meth user!
-Actually my vette runs entirely on methanol now, which is what reminded me of all this.

The 'old way' tab, is as it was from '05
The 'lambda driven' way I added today 17yrs later takes into consideration some things I was ignorant to / got wrong / etc.
-how much power the methanol injection is supporting, as that will subtract from how much the gasoline injection is thus supporting, of your total consumption
(my cars i would set up to fuel 100% on gas and then allow it to short term subtract what became unnecessary with the meth being added)
-that the power enrichment lambda target changes between the two fuels, old way assumed a fixed target lambda
(did not find this out until recently switching over my car to full meth)
-I also took how how much air was being injected with the fuels
(just complicates all the numbers and comes out in the wash)
basically how all that rolls through is that the two lambdas both have different weighting due to their fuels participation, so a new 'target lambda' is born
-then you just look up what that would be on the gas scale

you can click the blue cells to see the formulas vs. me typing it all here like last time.

Link to Calculator Spreadsheet

curious to your thoughts!

 

Seems like a great tool!

I was trying to modify it for E85 plus meth and I think I may have done it incorrectly. With my current 900fw hp setup I input BSFC to .75 and corrected the lambda for e85. Chart I have says peak rich power on E85 is 10.8. Should I put that in the “power enrichment ratio” field?

Little confused by the “target lambda” fields. What are those? Target lambda at WOT? Cruise? I left the gasoline 1.105 in that field. Assuming that’s incorrect.

I’m getting 10.2 afr target on the gas scale? That seems crazy rich. If I go back and zero out the amount of methanol I get the 10.8 AFR. So I’m guessing whatever someone targets normally on E85 is what they should put in this field? I put 11.2 AFR with 14gph of methanol and its telling me to target 10.59.

If that’s the case I’m going a lot leaner than I should. My ECU trims the AFR to 11.2 that’s with the meth active. So according to your calc I’m on the lean side and should set my target AFR to 10.6? I’d be curious how the car acts at AFR’s that rich. Usually, it sputters and coughs at those levels.

Also if we are mixing 50/50 by weight. We would essentially halve that number? So instead of 14gph I’d enter 7gph and shoot for 10.8?

Once I get all the numbers correct will def be fun to play with at the track.

thanks!

 

target lambda math is based on the target a/f ratio entered above for power

I am not sure if you are spraying half e85 and half meth on top of gas, or spraying meth on top of e85
-but i did grab what i found and make a second tab for meth on top of e85 as read by gas meter. i figure that's popular

 

E85 primary fuel. with meth injection. (no IC). 50/50 now with 7gph at each turbo.