The only mods I have is a BR air filter and safc2.Running 94 oct. '05 evo VIII
log is zeros across the board.

rpm tim o2
2710 20 82
3109 8 86
3554 5 86
3914 5 86
4449 7 88
4792 7 88
5269 9 88
5691 10 90
5980 12 90
6394 15 90
6867 18 90
7191 22 90
7757 21 86

It looks to me I need to add fuel 5200 on down but the higher rpm seems to be ok
with the exception of 7757.I thought evos ran super rich.

 

I do not even have my afc installed yet, so take what I say with a grain of salt ....but, I don't see how those O2 numbers could be correct.

From what I have read that looks like a decent timing curve, but if you really were running as lean as your O2's say, you would surely knock ...which would screw up your timing. So those O2 numbers have got to be wrong.

Not loggin the rear O2 sensor are you???

 

It is o2 1.
I thought they were wrong but after a couple other logs it is the same.

 

Yeah, that can't be right. I have never logged anything lower than .89 and that's only at peak torque where the factory tune is lean. In stock form, I saw O2s as high as 1.01. Even now with a LOT of fuel removed (-14 up top), I still see .93s and the occasional .91v. You would surely knock all over the place with AFRs as low as what those o2's indicate, but you clearly aren't seeing any knock. I'm not sure how you got a full 100% TPS reading at 7757rpm when that's well above the stock rev limiter, so I'm not sure that's an accurate reading either.

A good timing curve is the more important factor, so I don't think you're really running lean, but that is definitely weird. I wonder if it has anything to do with the BR filter.

 

I actually posted the 7757 reading to see if that was high.I watch the tach as it went past 7000 and was suprised when i didn't hit rev limit until then.
I bought the car new but I guess it is possible someone did the base flash when test driving but then again stock I ran a 13.8@102 w/a 2.0 60' ,so I wouldn't think it was flashed.I will try some more logs and if I get the same results I will go back to the stock air box and log again.

Thanks for the help

 

Ive taken mine past 7.7k with no flash also. denile, when you said BR air filter did you mean just a drop in filter or BRs mass air pipe with filter? Having a different intake might cause you to go a lot leaner.

 

buschur racing cone filter,mass pipe is not installed yet.

 

With your mods listed - I don't see that you have a wideband O2 sensor. So how are you taking the narrow band O2 sensor's values for tuning? Its basically an on off switch and can't be terribly accurate for tuning...correct me if I'm wrong.

 

Logs have been taken with a pocketlogger.

 

narrow band O2 in conjunction with timing can give you a pretty good picture of what is going on. ....Of course a wide band is best.

 

well cant be that accurate, if its not even used when your WOT(Power Enrichment) and just used for part throttle.

 

I think I found out what was causing the low o2 reading.Log is much better now,All previous logs were taken at higher elevation on my way home from work.
Here is my most recent log at a lower elevation:

rpm tim o2
2796 14 86
3250 6 88
3753 1 92
4191 5 90
4718 9 92
5234 9 92
5707 10 92
6238 14 92
6738 17 92
7007 21 92


This log includes some adjustments:leaned out 5200 and above and added fuel below 5200.Should I richen up around 4200 or let it be?And how about 2800 and 3200?

 

This log is good for educating people on why a flash is good vs an S-AFC. What you have here is a log that looks just like all of mine in the past. I could get my AFRs looking good and could get my timing to advance beautifully, but there was no way to get both a good AFR _AND_ good timing in the peak boost area. Now, on the good side, your timing climbed back up really quickly to 9 by 4700, but you do see how it dipped all the way to 1 at peak boost (3700). This means that from 3500 to at least 4200, you are at 5* or below. With a Dynoflash (I assume other flashes, too), your timing stays flat at 8* in that peak torque range and the mid-range beyond, then starts climbing towards 21 like it should. The result of this is a solid 1000-1500rpm during which there is MUCH more torque and horsepower with a flash than with the S-AFC.

Your question about richening up at 4200 is another lesson. The factor tune is quite lean in this area. Our tendency with the S-AFC is to richen it up there so that we get a better AFR that is not so lean. The unfortunate side-effect of adding fuel is that we cause the ECU to use a less aggressive timing map, so it reduces timing in that range even more. You either lose timing from adding fuel for a good AFR or you lose fuel from knocking due to lean AFRs. Either way, you lose, unless you have extra fuel from a fuel pump, injectors, or higher octane.

Don't worry about anything below 3500. It's naturally lean there and looks worse than it really is because your boost hasn't even built yet.

 

When did .90 become a lean condition?

 

^^^it's not as he has added fuel there, but it was at ~.86 stock. his timing is down there and he was asking about adding more fuel there to increase it.