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Old 02-14-2013, 03:43 PM   #15
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


Originally Posted by sheshani View Post
what should I do ?
1) get a wideband if you don't have one. Get it installed and setup so you can log that along with other parameters in Romraider

2) After getting your wideband setup, as mentioned above, you should add approx 10% to your MAF table. Just highlight the entire table and multiply by 1.1 for a start.

3) As you note that you are pulling timing, you should remove some timing from your timing tables. Remove 2-4 degrees for areas above ~1.2 g/sec and 2800 RPM to start and see if your IAM is still dropping. Where you've logged 4.5 degrees of FLKC, remove 4-5 degrees or so, where you've logged less FLKC, remove less. This is where the stock ECU is so nice to tune, it finds the edge for you, use it as your guide. Smooth out differences in cells so you have gradual transitions between RPMs and loads.

4) Flash that map to your ECU. Monitor FLKC and FBKC, but you're really wanting to get the MAF scale right first. Use Bad Noodle's OL MAF spreadsheet (download version 2.1 from here: )
You need to log:

engine speed (RPM)
Engine load (g/rev)
AFR from your wideband O2
Throttle Position

Use Airboy's spreadsheet ( )to open your CSV file. Open your file, and click the button to filter WOT data. Copy your OL fuel map from Romraider into the tab labeled <AFR target>. Go to the tab labeled <AFR Interpolate> click "clear data" then 'Grab Headers". You need to select the header that has your Wideband O2 data in it for AFR. Now "Get data" and "Interpolate AFR"

You'll end up with MAFv in one column and another column will have %AFR error. This is the difference between the AFR recorded by your wideband and the AFR your ECU is requesting. Copy these two columns into Bad Noodles spreadsheet.

Repeat for 1 or two more pulls so you have some redundancy to average.

Also you have to look at the data and manually look where it first reaches full boost, you probably want to manually delete some of these cells, as the ECU will make a "rich dip" here that is normal, good, and not something you want to affect your MAF scaling.

Now follow the directions in Bad Noodles MAF scaling sheet.

5) Re-flash with your new MAF scale and verify your AFR corrections are pretty small.

6) Adjust your fueling map so your moderate loads (~<5psi) are in the 12.5-13 range and as loads increase, you gradually richen to your target value of around 10.8 - 10.9 for 91 octane 11-11.1 for 93, etc... up to 11.5ish for race fuel / ethanol that has very high octane ratings. (I'm defining octane ratings in the way it's done in the US... the average of RON & MON. RON is usually 3 or 4 units higher than this average. I don't know how they measure octane rating in your country.

Some people move towards running a point or two richer at redline for additional safety. Your call on that.

Iterate maps until your logged pulls are pretty consistent. They should stay within +/- 0.1 of your target value from just past the RPM you get full boost to redline.

7) Now you adjust your timing so you are at the edge of getting knock. You want no FBKC or FLKC. add timing in small increments if you're not getting FBKC or FLKC in a load area. Subtract timing if you have FLKC or FBKC. I subtract about 1 degree per degree of FLKC and about 0.5 degrees per degree of FBKC.

The ECU will adjust and learn if you get knock, but you don't want it to get too much. You want your IAM to stay at 16 and maybe end up with at most 1-2 load cells with 0.5 to 1 degree of learned knock. very small values like that is okay, but your goal is no learned knock in any cells.
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