Yeah, I have been paying attention to my wideband readings whenever I am on crusing around, and am having success/no success with this mod.

I have noticed that it is only working about half the time. When I am crusing at 80mph on the highway, my wideband is still reading roughly 14.7. When I slow down to around 70mph, it foes to 15.1-15.3, where I want it. Now, I have double and triple checked that my car is running (Or would be) in the cells that correspond to that load value and rpm at that speed reading 15.4 (Which translates to an actual on my car of 15.2-15.4 afr). I am kind of lost on this one because I went in and changed Map 1 & 2 Open loop to a value of 10 from 500-4000rpm. I know the car is well over 10 load during crusing at 80mph, and it's in the low 3,000 rpm range, so the car should be running 15.2-15.4, but it's not. I have changed ALL the original 14.7 map values on my fuel table to 15.4 to try and get it to work, but it still seems spotty.

I am going to log it again, and really look at the logs to try and see why the car is only running at 15.2-15.4 at certain times.

 

In response to this, I am wondering this too because of my post above. I can't get the car at 80mph to run at anything more than 14.7, even though my maps are all correct to try and get it to run above 14.7.

Maybe razorlab and JohnBradley can chime in on this?

 

I changed the 3000 and 3500 rpm cells in the Open loop throttle high and low tables to 2.5 from 3.0. No change on the drive to work this morning. I need to see if I can log the throttle voltage to see what I am hitting. Still acts the same, at normal cruise / maintaining speed afr=14.7, give it some throttle then goes to 15.3 or so.

 

Do you think it's cuz when you're cruising the load stays under 30? Then when you press the gas some, it goes to the altered load cells of 40-80?

 

^^ Idle is 20-35ish...cruise is 40-80.

 

I had the same findings, see my post earlier in this thread. I am beginning to think there is an enrichment table or something we haven't found yet. My afr's would be where I wanted them under 3k. As soon as I hit over 3k, they would richen up to 14.3. This usually corresponded with over 70mph.

Unfortunatly, I don't have enough time or road (I live in a urban area) to keep testing this currently.

 

You just hit the nail on the head with that one. That's exactly what my car is doing to the T.

 

Here is a log I took this AM, on my way to work. I have changed both Open Loop Load to 45 from 2000 - 4000 rpm with 40 at the 3000 and 3500rpm spots. I have adjusted my fuel map to target 15.4 from 40 - 80 load from 2000-4000rpm.

If you look at the log, I can see that my accell enrichment and MUTLoad2byte shows significantly higher values when I am cruising at a 14.7 ish AFR. At 15.4 AFR these values are lower. Any thoughts?

 

Hmm accell enrich does go from 1.00 to 1.20 at 3k in the table, then 1.33 at 3500

Stupid me didn't even think of that...

 

Damn, now I am going to have to log and look at that on the way home from workie today.

Nice..

 

Razor, any idea on what the values for Accell Enrichment map relate to? Just trying to figure out how the 1.20 and 1.33 relate and how they figure into the Open loop/closed loop scheme. I may map the 1.20 through 4000 rpm tonight and see how it goes; if the laptop battery isn't dead!!

 

accell enrich is usually used on quick throttle changes, as it will enrich the mixture on quick transitions. It really shouldn't have a factor on what we are trying to do in this thread. However I have learned to never rule anything out and it could be calling on that table in conjunction with everything else. I really think there is an enrichment issue going on here, it could be from that table or one that hasn't been found yet.

Maybe try 1.00 from 2500 to 3500. As stock its 1.00 at 2500 and 1.2 at 3k. 3k is where my AFR would richen up to 14.3 no matter what I had in the fuel table.

 

I will see what I can do when I get out of the office. I will say that the current changes are having an effect on the MPG even though I keep bouncing out. I am up to 270 miles and have a 1/4 tank left. I am usually searching to a gas station about now.

 

A very very interesting observation, don't know if this has been noted yet.

The Accel Enrichment looks to be directly related to my JDM MAP readings inversely.

I took the following readings from a log that I did trying to nail down my AFR cruise values and plotted them on a graph in excel:

TPS (x10)
Speed (x10)
AFR (x100)
MAP (ABS. value x100)
Accel Enrichment (x10)

(All scaled to get the plot to have all the numbers closely scaled)

When plotted out, everytime the JDM MAP goes up, the Accel enrichment goes down.

The plots literally looks damn near a mirror image of eachother. Maybe the MAP sensor and the Accel Enrichment tables are related?

Actually, come to think of it now, since I took the MAP value and x100 then took the Absolute value of it, it negated the curve. They would be directly related then, not an inverse relationship.

So, as the boost goes up, the accel enrichment does to, at the same exact rate.

Confirmed, just changed my graph to eliminate the Absolute.

It also follows the TPS somewhat as well.

Damn, I just realized in this post I am talking to myself basically. WTF.

 

as quoted from mitsu site on the EvoX for valve timing

"Under most conditions, to ensure highest fuel efficiency, valve overlap is increased to reduce pumping losses. The exhaust valve opening timing is retarded for higher expansion ratio, enhancing fuel economy. "

Can we apply this to our intake cam to allow for more valve overlap or do we need the availability of both mivec cams to make this useful.