[Maddawg58]

First the disclaimer: I have no idea what I am doing.

Next, Datalogged a 0-60 run........RPM ok, Boost on the level, Ign Correction , AFR ....

Am I logging the correct items? Can someone break these two down cause that doesn't look normal at all.....

[Calvin@Vishnu]

Originally Posted by Maddawg58

First the disclaimer: I have no idea what I am doing.

Next, Datalogged a 0-60 run........RPM ok, Boost on the level, Ign Correction , AFR ....

Am I logging the correct items? Can someone break these two down cause that doesn't look normal at all.....

Short answer: No, you are not datalogging the correct items

Air/Fuel Ratio is no longer an active parameter once you do the o2 harness update. This is because it read off of a rear o2 sensor which the Procede no longer intercepts. To read actual AFR, you should be datalogging CAN Air/Fuel Ratio bank 1 and CAN Air/Fuel Ratio bank 2 instead.

Also, don't mistake Ignition Correction for Ignition Advance. To log ignition advance, you should log CAN Actual Ignition Advance.

Other than that, from what I can see that is useful, everything looks fine.

[Maddawg58]

Thanks Calvin........next run will have CAN AFR Bank 1 & 2. Here's CAN Ign Advance, normal?

[Calvin@Vishnu]

Originally Posted by Maddawg58

Thanks Calvin........next run will have CAN AFR Bank 1 & 2. Here's CAN Ign Advance, normal?

Attachment 517403

It looks normal. But you really want to log CAN Actual Ignition Advance instead. CAN DME Ignition Advance (which you logged) isn't as useful.

[Maddawg58]

Roger.....next log will have'm

Trying to understand my logs and not just wether or not my car is holding boost.

Thanks for the help and patients bro.....

[MKE_M3]

also, it's always good to log actual throttle position and in higher gears. 1st and 2nd go by so quickly, and typically with traction problems, that it can make it tough to get clear results. Just my 2 cents. I know its hard to find a place to do 3rd and 4th gears pulled without ending up in jail

[Ilma]

^^ All good advice above.

From what is useful in your log, the boost is holding perfectly and your timing looks very good as well.

At around the 36 second mark (little red numbers on the x-axis) you seem to hit 3rd gear and the portion of your timing curve in that time slot has no dips and is upward sloping as it should be.

FWIW I log:
Boost
Act Ign Advance
Intake Temp
Can AFR
Throttle and DBW throttle both on one plot.

[**335i**]

nice i also never logged all this data hope soon to make some logs and postem here

[jdbretz]

Here is an example of something you don't want to see in a datalog. If you look where the arrows are drawn, those are timing drops. I was running too high of boost for my mods/environment. I was running 14 psi fine during the colder months but now that things have warmed up a little, I have to lower the boost (or get more mods). Hope that gives you an example of one thing to look for that indicates the car is not running optimally.

[Maddawg58]

looks like you have your chart WAY zoomed in during 1 gear pull, could you see that value from the "Normal" chart setting?

[jdbretz]

Originally Posted by Maddawg58

looks like you have your chart WAY zoomed in during 1 gear pull, could you see that value from the "Normal" chart setting?

That chart is intentionally zoomed in and reflects a 3rd gear pull. If you have your datalog zoomed out too far its almost worthless to be able to read any of the information and you probably wouldn't notice dips in timing, boost loss/spikes, or any other key information. You should view your datalog when the car is under high load to see how the engine is responding to the tune so its good to zoom in during a 3rd gear pull or a 3-4 pull. You can log several pulls but to actually analyize the data you will need to zoom in to specific sections and set your parameters for each channel you are logging. I don't consider myself an expert by any means on datalogging, but that is at least how I understand its supposed to work. Maybe others can add to or take away from what I posted in case I don't have it all right.

[Jeff@TopGearSolutions]

3rd GEAR WOT from 3000 RPM to redline should be a standard Log.

[Maddawg58]

Now we are getting somewhere.....makes total sense now......I was looking at a 0-60 WOT through 4 gears, no wonder why this sh#t doesn't make any sense.
Just zoomed my chart into 3000 - to redline 3rd gear and bam...CAN DME Adv Ign.......smooth sailing with no significant dropoffs (drop off at end was a shift point to 4th), now I understand.




However, from another post that if ign stays above 10 your good, if it falls below you should lower boost. Therefore, according to the chart above I should back off of boost by a little....say .05 percent. Probably want to take a couple other samples before that, to make sure it wasn't an anomaly. What'cha think?

[OpenFlash]

Originally Posted by Maddawg58

Now we are getting somewhere.....makes total sense now......I was looking at a 0-60 WOT through 4 gears, no wonder why this sh#t doesn't make any sense.
Just zoomed my chart into 3000 - to redline 3rd gear and bam...CAN DME Adv Ign.......smooth sailing with no significant dropoffs (drop off at end was a shift point to 4th), now I understand.
Attachment 518601

However, from another post that if ign stays above 10 your good, if it falls below you should lower boost. Therefore, according to the chart above I should back off of boost by a little....say .05 percent. Probably want to take a couple other samples before that, to make sure it wasn't an anomaly. What'cha think?

I'd say you are fine where you are.

[jdbretz]

Originally Posted by Maddawg58

Now we are getting somewhere.....makes total sense now......I was looking at a 0-60 WOT through 4 gears, no wonder why this sh#t doesn't make any sense.
Just zoomed my chart into 3000 - to redline 3rd gear and bam...CAN DME Adv Ign.......smooth sailing with no significant dropoffs (drop off at end was a shift point to 4th), now I understand.
Attachment 518601

However, from another post that if ign stays above 10 your good, if it falls below you should lower boost. Therefore, according to the chart above I should back off of boost by a little....say .05 percent. Probably want to take a couple other samples before that, to make sure it wasn't an anomaly. What'cha think?

Can you post the above timing chart with RPM chart of the log to reference off of? It looks like there was a dip and timing and it didn't really ramp it back up, but without seeing the RPM with it, its hard to tell if that was a shift, throttle closure, or something else.

EDIT: If Shiv says you are fine, then I would guess there is nothing to be worried about. Like I said before, I am not an expert on this.

[Maddawg58]

Now I need a break down on AFR........log CAN Air/Fuel Ratio Bank 1 & Bank 2 (dumb question but got to ask, I assume taken at the o2 sensors?)


What values are we looking for? What info can we glean from this? Ign tells me lots about my boost value setting, what about AFR?

[OpenFlash]

Originally Posted by Maddawg58

Cool, thanks bro.....starting to make sense. How low should we let it go before making a change? or are we waiting for a significant and sudden dip as in knock?

I think it's very easy to get carried away with things when it comes to datalog analysis and custom tuning. It's normal to get knock retard from time to time. Getting rid of it completely isn't feasible. So unless most of your runs/logs show knock retard, leave it alone. If only say 1 out of 3 pulls show an ignition drop out, that's fine. I think a lot of people are getting a bit too eager to make changes before have a good perspective of the situation. That's not to say that datalog analysis isn't useful. But like anything, too much of a good thing is a bad thing.

[jdbretz]

Originally Posted by Maddawg58

Now I need a break down on AFR........log CAN Air/Fuel Ratio Bank 1 & Bank 2 (dumb question but got to ask, I assume taken at the o2 sensors?)
Attachment 518604

What values are we looking for? What info can we glean from this? Ign tells me lots about my boost value setting, what about AFR?

Click on the A/F channel in the lower left and press the "p" key on the keyboard to edit that channel's properties. For max value set 18, min value 10, and uncheck AutoScaling. Click ok and then repost the graph. That will allow everyone to see in better detail the AFR.

[Maddawg58]

Sorry, that wasn't one of mine.....I need to do another couple runs. Like a dumb @ss I was logging AFR vs CAN AFR Bank 1 & 2, looked like a cardiac arrest......I'll be out tomorrow and will do a couple of runs. Now I got a target to shoot for, a nice even smooth 3rd gear pull to redline. If I don't end up in jail I'll post it for dissection tomorrow.

[**335i**]

Originally Posted by Jeff@topgearsolutions

3rd GEAR WOT from 3000 RPM to redline should be a standard Log.

only 3rd gear no need to 4th gear? one pull with 3rd GEAR WOT from 3000 RPM to redline?