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Old 07-19-2012, 10:34 PM   #1
obi10
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Default WRX datalog

Could someone check my datalog to see if my cars running okay? 2002 WRX Stage2 ACN91 v310 (oem sti catback), catless up pipe.




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Old 07-20-2012, 08:03 AM   #2
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Bummp
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Old 07-20-2012, 08:03 AM   #3
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Originally Posted by obi10 View Post
Could someone check my datalog to see if my cars running okay? 2002 WRX Stage2 ACN91 v310 (oem sti catback), catless up pipe.
Hi there. Your dynamic advance multiplier (DAM) has dropped to 15, which is an indication that there was some perceived knock along the way. Normally, it should stay at 16 (some maps will start at a lower value after reflash/reset, but will learn up to 16 if everything is good).

How long has it been since you installed the AccessPORT or reflashed a map? Your boost is also wavering a bit - I would recommend getting a pressure test of the intake tract done. If you have an air compressor, there are various DIY thread on Nasioc about how to build your own rig. Or, most Subaru performance shops can do this for you (pressure or smoke test).

One thing you can do is if it hasn't been long since you installed the AccessPORT or reflashed a map, is to drive normally on it for about a tank of gas without reflashing any maps or resetting the ECU. Then we can look at your long-term fuel trims (A/F Learning 1 A, B, C, D) to see if there is any kind of fueling issues. Various problems can crop up on these older cars that can generally be seen in the long-term fuel trims such as intake tract leaks, bad MAF or front o2 sensor, etc.

In California, gas quality is highly variable - you might want to also check with local enthusiants and see what gas brand works best.

Bill
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Old 07-20-2012, 02:13 PM   #4
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you boost is all over the place. looks like you're hitting peak boost around 3200 rpm.
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Old 07-20-2012, 02:51 PM   #5
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What does it mean by "percived knock?"

The last time I reflashed my map was about 2-3 weeks ago, and I resetted my ECU a couple of days ago and then I ran a datalog the day after. How long should I drive my car before doing a datalog with new parts?

Forgot to mention, but I had a code P0171(system too lean bank 1) after I installed the up pipe with the EGT probe in it. I deleted the code and it hasn't shown up at all so I'm guessing the CEL is gone for good?

Thanks for looking over the datalog
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Old 07-20-2012, 04:49 PM   #6
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What does it mean by "percived knock?"

The last time I reflashed my map was about 2-3 weeks ago, and I resetted my ECU a couple of days ago and then I ran a datalog the day after. How long should I drive my car before doing a datalog with new parts?

Forgot to mention, but I had a code P0171(system too lean bank 1) after I installed the up pipe with the EGT probe in it. I deleted the code and it hasn't shown up at all so I'm guessing the CEL is gone for good?

Thanks for looking over the datalog
The P0171 is directly related to the long-term fuel trims. That means that there is some kind of fueling issue. Possibilities include:

1. Using the wrong intake for your map (only stock or Cobb SF intake have been tested with the OTS maps for your car)
2. A post-MAF intake tract leak
3. bad MAF sensor
4. bad front o2 sensor
5. some other mechanical fueling issue with the car - fuel pump, injectors, etc.

When you reset the ECU or reflash a map, the fuel trims will be cleared and the CEL will be gone, but that doesn't mean the fueling problem has gone away as it takes some time for those trim to populate accurately. You can confirm this by driving normally through about a tank of gas without reflashing any maps or resetting the ECU and then checking the A/F Learning 1 A, B, C, D values. At this point, I would not do any more heavy throttle runs.

Bill
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Old 07-26-2012, 12:49 AM   #7
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I got new sparked plugs and ran another datalog. Am I running to high on my PSI or is that normal? Do I have to switch to a LWG or HWG map? How's this one:


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Old 07-26-2012, 08:25 AM   #8
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I got new sparked plugs and ran another datalog. Am I running to high on my PSI or is that normal? Do I have to switch to a LWG or HWG map? How's this one:


You still need to consider your fueling issue that originally caused the P0171. That is a serious code as it indicates that your fuel trims hit very extreme values at some point. We can't see that in your fuel trims now as it appears you have just reflashed a map or reset the ECU (which clears the trims). I would drive normally on a tank of gas without reflashing/resetting the ECU to see where you long-term trims end up (A/F Learning 1 A, B, C, D).

Boost is not excessive, but it is wavering a bit. I wouldn't worry about that until you get the fueling issue identified.

Bill
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Old 08-06-2012, 12:59 PM   #9
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After cleaning the MAF and going through a tank of gas without resetting the ECU, here's my results of the A/F Learning 1 A, B, C, D:



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Old 08-07-2012, 09:44 AM   #10
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After cleaning the MAF and going through a tank of gas without resetting the ECU, here's my results of the A/F Learning 1 A, B, C, D:



Fuel trims look fine. I would keep in an eye on them (and the DAM) for a period of time to make sure. Generally, they should stay within +/- 5%.

Biull
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Old 08-07-2012, 10:27 AM   #11
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One last thing I needed to be check, the PSI has been acting strange lately. Whenever I'm on boost it's like I could fill the car pulling and hesitating for a small small period and then pull again. Do you think it's a leak? Or do I need to adjust the wastegate actuator arm?

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Old 08-08-2012, 09:05 AM   #12
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One last thing I needed to be check, the PSI has been acting strange lately. Whenever I'm on boost it's like I could fill the car pulling and hesitating for a small small period and then pull again. Do you think it's a leak? Or do I need to adjust the wastegate actuator arm?
You have a pretty good boost spike in that log - I would go to the maps section at the cobbtuning.com site and download the low wastegate (LWG) version of your map and reflash that to see if it helps with boost control. If you still get a spike after that, you can try loosening the wastegate arm. I would also check all the wastegate lines to make sure there's no cracks or other damage (check all sides).

It would be a good idea to get a pressure test of the intake tract done, especially since you've had fuel trim issues in the past.

Bill
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Old 08-08-2012, 04:40 PM   #13
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Thanks, you've been much of a help to me .
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Old 08-12-2012, 07:49 PM   #14
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What do you think I should do; tighten the wastegate arm or loosen the wastegate arm? I'm not sure which way to go.
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Old 08-12-2012, 07:55 PM   #15
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Have you tried the LWG map first? If not, do that first.
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Old 08-12-2012, 08:00 PM   #16
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I have actually, here's the log for it:

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Old 08-12-2012, 08:32 PM   #17
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That log doesn't look bad to me. Perhaps slightly underboosting, but that won't hurt. Why change anything?
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Old 08-12-2012, 09:18 PM   #18
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What's the correct boost range for stage 2 on a 2002 wrx?
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Old 08-12-2012, 11:14 PM   #19
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Had to go back and see what gas you are using. On the LWG stage 2 map with 91 octane, boost target is 16Psi. So actually, your boost is pretty spot on. Stick with that map and see how it goes.
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Old 08-14-2012, 12:22 AM   #20
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Will do, thanks for your input.
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Old 08-17-2012, 02:19 PM   #21
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Default datalogging

Is there a way i can datalog with my OBD2 scanner and reader? I dont have a accessport yet so I'm trying to figure out if its possible without an access.
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