Thanks I have never used Excel too much so i am having to relearn

 

You mean like this graph? I made that in Excel, and I still have the XLS, but I even astounded myself when I made it, and for the likes on me, I struggle to figure it out again... Too many barley pops I guess - lol

 

Nice.

 

I will post up the xls tonight - if you guys figure it out, then you owe me more barely pops...

The datalogs in that xls are from Hymee's scananlyser also. So, now I need to figure out the format for the Cobb csv log files...

 

And here it is in all it's confusing glory...

 

Here are a set of "typical" logs:

 

the turbo accelerated from 60 to 200 in 10 secs ... whaaaat?

 

Love the support this thread is generating!

 

lulz.

KPH.

These are all on an inertial dyno, so the rise time doesn't count, anyway.

 

Cool, thanks.

 

There are still so many factors to account for.... but at the same time I feel like I'm lacking in MAF with 201g/s being my max. That is on your NA base tune.

 

maf ically inept .. maf ically challenged .. maf matically lacking .. maf us withoutus .. And i suppose as we dedate these maf results we eventually become expert mafdebators ....

Just thinking aloud here ....

 

Bump. Do you guys think my BHR pump comes into play? Can you see where I shifted to 4th Oh, and ambient temp gauge measured 99F.

http://www.flickr.com/photos/9krpmrx8/4998956030/http://www.flickr.com/photos/9krpmrx8/4998956030/ by http://www.flickr.com/people/9krpmrx8/, on Flickr

 

Hey guys...

Here are a couple of snapshots of a WOT run in 1st gear in my 2004 AT RX8.

I used Kane's Baseline program to modify the fuel trims in the Open Loop areas.

The snapshots below are after the first "fine" tuning I did.
I first adjusted the entire Open Loop, higher load and RPM area of the stock Map fuel trims by an M value of 1.15.
I applied this map to my ECU, and called that my "JK Base Map V1".
I did this because my COBB logs, when using the Stock Base map in this area, were showing a steady AFR of 11.17.
I belive the COBB AFR scale bottom's out at this value, as I have not seen it go any lower...ever.
I logged about 4 days worth of normal / hard driving and applied those logs into Kanes Baseline program and it showed me the rich areas that I still had.
I adjusted the fuel trims again using the M values provided by the program.
The average changes I still had to make, in the same area as before, was still another 1.05M to 1.25M decrease in fuel.
I have since applied those new M values to the areas specified by the program into my fuel trims and have applied that to my ECU.

The snap shots below are after a day or so of normal driving.

Questions:

(1) Are the Open Loop areas of the stock ECU map really that rich???? I have moved the values up now twice, and as you can see in the logs, still get quite rich in some areas. Am I missing something?

(2) Does that map look ok with that growing peak in the fuel trims in my Open Loop, higher load and RPM areas?

( 3) I have another log of a good pull in second gear up a steady hill. AFR's in this log are not quite a rich at WOT... I belive they are pretty good for the load and RPM???

Any input would be appriciated....

Thanks.

 

Try and do a log just during a 3rd, 4th gear pull on flat road. Start the logging right before and stop right after you let off.

 

You are applying the M values to the MAF scales yes?

Also, your MAF pulls must be long and slow. Though based on your logs, I don't see anything radically wrong, your STFT jumped high, but that could be throttle tip in, have to let it run some and see if your LTFT change to a high positive value.... but for sure be doing those cruising pulls before you mess with the WOT ones.

 

Kane, what do you think are ideal logging scenarios? Highway trips? Normal in city highway driving? 3rg gear WOT runs? Also do you agree with the items on the first page in terms of what data should be logged?

 

For MAF Scaling, long 3-4th gear pulls on flat ground are best (cruise control)...

As for what to log:

Time
Coolant Temp. (° F) - optional for most things
Equiv. Ratio (AFR)
RPM (RPM)
Calculated Load (%)
Long Term FT (%) - get STFT too, helps to see open loop
Mass Airflow (g/s)
MAF Volts
Throttle Position (%)
Ign. Tim. Lead. Coil (°)
Ign. Separation (°)

The rest of this list looks fine.

 

Hey Kane.....

I was taking the attached log info from your program and doing the following:

For Exsample:

At 7000 RPM at 100 percent load, the percent of change was
-13.7968355408958. So I applied the value of 1.13M into the "air/fuel Gear 1-2" area of AccessTuner Race at this area in the cell.
I did this for all rich values to try and reach my goal of 13.8 AFR in the open loop areas.

I have the stock airbox, so I did not think i need to calibrate my MAF sensor.

Is this not the way I should be tackeling this?

Thanks.

 

Nope, you need to start with the MAF, even stock they can be off by quite a bit. The goal is to get your Target AFRs (the map in the Cobb under fuel gear, to match the actual AFR's that you are seeing.

 

ahhh... ok.. That may explain why stuff seems sooo far off... lemme play.

 

Isn't 13.8 a bit too lean? I know that if your are racing in Star Mazda they say the most power is .92 - .93 lambda, but we are not racing. I would like to shoot for more like 13.0 in open loop.

Here is a dyno graph from a Cobb dyno tuned NA for example. Notice the trend line of the AFR? It looks like 13.0 - 13.2 to me.

 

That's great info... Great graph.. That is what I am trying to shoot for.

I will back it off a bit... I read in other areas that 13.6 to 13.8 was max power... but it looks like at a cost???? Engine maybe?

Thanks again.

 

Ok... So I took these averages at the different MAF voltages and applied the M value's to to my MAF curve in AccessRace. (See Thumbnail)

By the looks of the numbers the lower voltage areas should have got richer, and the higher voltages should have gotten leaner... Based on more and less air scaling.

I must have done sumth wrong... as the car ran like total crap... Backfired when it started... and during warming up...

Then when I drove a bit.. it had bad hesitation at lower RPM's and from standstill.


I dunno... me confused, Ha ha ha...

What I tried now was just changing the MAF values between 2.77v and 3.71v.... The car runs fine now and is a bit leaner up at WOT... Low 12's as a min.

 

Those low end MAF values will only work right if you've got closed loop driving turned off.

And you have to log and drive specifically for MAF tuning.

Did you read my scaling the MAF thread?