I have a tech edge wideband controller that reads 0-5v and 9-19:1 AFR unleaded but I want to have it set for e85.
From their website it says (v/0.5)+9=AFR
But this +9 obviously won't work for e85.
So I need to work out what I need to plus it by.
So far I have calculated it to be (V/0.5)+4.08= e85 AFR
I done this by working out the difference between stoich of unleaded and stoics of e85 which I have at 14.7-9.78, the difference being 4.92.
I then minus 4.92 off 9 which gave me 4.08.
Which is how I came up with (V/0.5)+4.08= E85 AFR
So (9.78AFR-4.08)x0.5=2.85V for stoich E85.
But by tech edge website their wideband reads
0.612 lambda at 0v - 1.293 lambda at 5v...
Which fucks my calculations up
Because when I use my calculation for
0volts I get (0v/0.5)+4.08= 4.08 AFR
Which is 0.42 lambda not .612
5volts I get 14.08AFR which is 1.44lambda not 1.293
I understand I can work of lamda values or just pretend 14.7 is 9.78 but I'd prefer to work it out
Any help would be appreciated
Thankyou!!