Wideband help...LC-1>Aeroforce

[slickbonny]

hey guys. goin to a mod meet tomorrow and i have the LC-1 and Aeroforce. LC-1 has analog outputs and the Aeroforce has analog inputs. i was wondering if anyone could help me with the formula to use so i can plug the LC-1 into the Aeroforce because i plan to watch AFR and KR all the time. does anyone know it or where to get information on it? i have no idea what to do once i have them installed and hooked up. any programming help would be great. thanks

[viper8907]

In the aeroforce Input set-up, enter 3.008 for the slope, and 7.35 for the intercept. That is the default output for the LC-1, you can customize the output, but you don't need to.

If you want to know how I came up with 3.008 and 7.35:

0v = 7.35 AFR
5v= 22.39 AFR

Slope = Difference in AFR/Difference in voltage

22.39-7.35 = 15.04

15.04/5 = 3.008

Thus the formula is AFR = (3.008*Voltage)+7.35

Intercept is 7.35 because that way when voltage input is 0, the display will read 7.35 (7.3 actually)

[slickbonny]

awsome! thanks for the help... does it matter that im running E85?

[00Beast]

No. AFR is AFR whether you're running Gasoline, Methanol or Ethanol.

[willwren]

Wrong. AFR for E85 is 9.76:1, not 14.7:1 like gasoline, which is why E85 can drive you to a larger injector sooner than normal.


Air/Fuel Ratio
Gasoline E85
Stoichiometric 14.7:1 9.7:1
Max power (rich) 12.5:1 6.9:1
Max power (lean) 13.2:1 8.4:1


Running lean on an L67 with any fuel is very dangerous. Running 14.7 as advised could be fatal to your motor under boost.

[00Beast]

Correct, but he doesn't need to change his settings to accomodate for E85. It will just read 10:1 or whatever instead of 14.7:1. The ratio is different, but the gauge reads on the same scale no matter what.

I apologize if my last post wasn't clear.

[willwren]

You need to make that VERY clear when making statements like that. Be specific so it can't be misunderstood.

[BonneMe]

AFR is Air:Fuel ratio, It's just a unit to measure by, and those same signal conversions for the gauge apply no matter what fuel you run, and that is what the thread was about.

The OPTIMAL AFR you aim for is based on the fuel's stoich being tuning for.

[willwren]

Correct. And we need to make sure that some member or non-member that reads this topic in the future doesn't misunderstand the information here, and mistakenly tune to the wrong OPTIMAL AFR for the furel they run, especially on an L67.

[yourgrandma]

OP, your mod list makes me quiver. That is all.

[slickbonny]

so no i dont need to do anything diff to hook it up. just look for the power and stioch number to be where E85 is suppossed to be?

... and thanks man. dont know wut else to do untill i get money for a N* and MAF. then maaaaybe a Gen V. but theyre too expensive still. plus im still waiting on my stock tranny to go and build it.

[00Beast]

so no i dont need to do anything diff to hook it up. just look for the power and stioch number to be where E85 is suppossed to be?

Correct.

[slickbonny]

ok, i got the bung in. and thanks to "viper" the formula. once i hook this up, it will be a new tuning experiance for me. im used to the narrowband tuning: reseting and turning fuel trim learn off, taking a long drive while keeping the throttle smooth and in each cell for a good amount of time(up to the 7500Hz range), then taking this percent diff and pasting to the MAF calibration table(sometimes "paste special by 1/2" depending on drive or how close the tune is)..... now what do i do once i can see my actual AFR on the Aeroforce? how do i tune the 7500+Hz when in PE mode or WOT? i only have HP Tuner standard.