i did a free-air calibration and it works like a charm. i did not have to move the ground, so i lucked out there. it reads 14.5-14.9 at idle, so i figure it is getting a pretty good reading. thanks for the help guys!
Is eveything still on the same ground as previously mentioned? Keep us up-to-date on how well the LC-1 works with the Interceptor (some people have had difficulty with getting them to work together). Good work (you should write a how-to for all the people with the Interceptor/LC-1 combo)!
yes ALL of my "aftermarket" grounds are wired to the same spot inside the fuse panel. my settings for the lc-1 are 5v=22 0v=8 and the interceptor settings are slope=2.8 and intercept=8.
i also have an autometer a/f gauge hooked up to teh other lc-1 output, but i am still playing with the settings. i think i am going to set it at 1v=10a/f and 0v=17.6a/f but i am not sure yet. if anyone has any questions please post them up and i will see if i can help.
for those of you that do not want to use my settings you will need to calculate your own #'s as follows:
y2-y1/x2-x1 for the slope and your intercept is going to be your y1 number (assuming your x1 is 0).
so to test my #'s you take (22-8)/(5-0)=2.8 where y1=8, so that is my intercept. hope that helps.
you wouldn't HAVE to use a computer if you wanted to use the preset #'s. analog out 2 comes set as 5v=22.39 and 0v=7.35, so your slope would have to be 3.008. the problem is the interceptor is only accurate to the tenth, so you would have to use a slope of 3.0 and an intercept of either 7.3 or 7.4. so i changed the upper and lower limit so i could get a more accurate slope and intercept.
if anyone is hooking up the lc-1 to an autometer a/f gauge i have found that 1v=10 and .05v=17.6 works well. there are 6 rich LEDs and so 12.0 would be the last rich (green) led. so if you are tuning and it switches over to stoich (amber) you have gone too far (unless you have w/i). i wouldn't tune using the autometer gauge, but i use it pretty much as a warning light. if i see it turn amber under WOT i know i need to back off the clamp a little.
those are just my settings, they can be changed to read anything you want really. this post has nothing to do with the interceptor, but it goes along with my install.
well i just changed the lc-1 settings to 5v=15 and 0v=10 to try to focus on that range of data. this way i can have a .1v change for every .1 afr change. so far it is working great, but i need to back off my clamp a little as i am seeing 12.5-12.9 in 3rd from 3k to redline.
with the new lc-1 settings i also had to change the scan gauge settings to slope=1 and intercept=10.
Keep in mind that grounding issues can cause an offset. On my AEM wideband I was seeing ~.1 A/F higher than the AEM gauge. This was obvious at idle were I should have seen 14.7 but was seeing 14.8. I lowered the intercept (offset) by .1 to correct this. You'll see a lot of discussion on the Innovate site, as well as other data-logger sites about grounding. Cars are not known for having good grounds, and typically signal and chassis ground are not at the same potential. I'm also using a 3 bar MAP sensor for my analog input #2. The same ground issue caused it to be off by 0.4 psi (this was obvious with key on/engine off - I was seeing -0.4 instead of 0.0). Again, I adjusted the intercept (added 0.4) to correct this.
so then what you are saying that that i am not seeing correct #'s? i thought since my car would idle between 14.6-14.2 that the car ran a little rich @ idle. should it idle spot on @ 14.7 when idling?
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