you need the WB to measure the changes in AFR

 

Had a odd thing happen tonight on the cruise home. My cruise AFR went back into closed loop. Nothing else has changed.

Will look into it more and try to figure out why.

 

The threads kind of need to be merged because the other one has some questions in it that I feel are being discussed in this one so I will answer them in this one.

I have both tables on my car set the same way. I do not know if it is needed but for sake of simplicity and until I can determine that my theory of warm up versus operating temp maps is proven/disproven they are the same.

You can watch the WB and know if its open loop or closed loop without actually logging 02 feedback realistically.

Bryan-maybe air changes or location? Needed a little more throttle to maintain speed and took you out of the load range? In a 6 speed (I know you are now a 5) 80mph is 3500 rpm and 70ish% load as I recall. I would think the load would be about the same for the 5 speed maybe just more RPM.

 

have open loop set at 45 from 2500 to 4k.

Still on the 6spd, the 5spd is still in the box in the shop since I have been too busy/lazy.

I do have my fuel map load row scaled different than stock but it still is weird that if open loop is at 45 then why did it go back to closed loop unless my cruise load was lower than 45. My idle is 25-30.

It was also back in closed loop today to/from the shop.

This week I might try to just set the car open loop and see if it reverts back.

 

you have the O2/Ecu periphery set to 56d8? You could also turn the front O2 off and make it closed loop but I dont remember the new hex right off. I believe its 56d0. I will post that up later.

 

I do have the rear 02 Cel turned off via the ecu.

 

I was unsure about the car going into closed loop after modifying table #1 and finally adjusted both tables. The good news though is that I just broke 25 mpg on my last tank and that included a few 3rd gear WOT pulls as well as normal in-traffic driving. I think that if I *just* drove it normally, I'd probably get the 26 mpg JohnBradley mentioned earlier, maybe a bit more. (Was that the other thread?)

I think it's funny when people talk about driving it hard as a daily thing. If you live away from other people then I suppose you can do that, but once you're in traffic it's not like you can do anything but creep along with everyone else. Heck, even with my not terribly modded evo rarely does anyone keep up even at part throttle if I'm first at the light. Maybe my definition of driving hard is just different, I'm sure that some non-evo owners think I drive like a maniac. Accelerating "briskly" probably seems to them like I'm flogging it.

 

So did you change both values in open loop 1 and 2?

 

Yeah, I adjusted both Open Loop Load #1 and #2 tables pretty much as John suggested. I'm not sure it's necessary to do both, but I was also not sure I was getting into open loop initially. So far, it doesn't seem to have had any adverse effects.

 

Ok sounds good, I'll try just changing 1 and see what happens, just need to find do all of this and test it out...

Thanks for the clarification!

 

Can someone link the threads with John's suggestions? I do not recall seeing it...

I haven't been playing in this forum as much recently as I usually do...

 

https://www.evolutionm.net/forums/sh...d.php?t=300576

look at post #12, there's more info in the 2nd page as well

 

Here is MY CURRENT setup including a look at part of my fuel table. To answer the questions before they arise, my car idles too rich so I pulled fuel out by making it idle in open loop. Now that I know you have to modify both tables I have altered the idle in table 2 as well. Please DO NOT DO THIS if you do not understand it, do not have a WB, and arent willing to go out on a limb. While it works and I havent had any issues (as well as the others now doing this), please be aware an improper tune using these methods can result in damage.

Now on to the pic:

 

I tried this method and adjusted table 2 open loop only. I set it to 45 from 2000 to 4500 rpm and then set the fuel table to 15.4 from load cell 40 to 80 from 2000 to 3500 rpm.

It did not work when I tested the AFR in cruising. I got 14.7-14.5:1.

I will try again and adjust both tables.

 

Someone mentioned, maybe in the other thread, that this was only for cars without a Cat. If this is true then please explain. I do not get the reasoning.