Welcome to the North American Subaru Impreza Owners Club Wednesday October 16, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > FA Series Factory 2.0L Turbo Powertrain

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 10-09-2019, 09:49 PM   #1
stlfd
Scooby Newbie
 
Member#: 507240
Join Date: Oct 2019
Location: St. Louis, MO
Vehicle:
2017 WRX base
White

Default Please help with data logs

Hi all. I usually just search for info on the forums, but I'm out of my depth on this one and I'm hoping someone can help me out. I started seeing a reduction in fuel economy a while ago so I got an AP to help me see what's going on. I've got high af learning 1b, 1d, and 1e (usually around 8%) 1a is slightly negative and 1c is low positive. I did a smoke test and didn't see anything, and I tightened all the hose clamps and installed an aos a couple of weeks ago and saw a slight improvement (reflected in above numbers). I think the bov clamp was pretty loose. I'll keep looking for a leak, but I'm worried about the logs I took on the way home from work today. I've been noticing my DAM dropping on my highway commute lately and today it was really bad. Dropped from 1 to .62 progressively. I've got a couple of cruise logs here, but I honestly don't know how to interpret them. Any help with this is really appreciated!

BTW, the car is stock other than an AOS, running stage 0 tune, and I also cleaned the MAF and MAP several times recently. Not sure if it's the problem, but I've been using a Wix air filter instead of stock. I'd try the stock one, but I threw it out a long time ago. Gas is top tier 93 octane.

https://datazap.me/u/atibbs2/log-157...0&data=6-11-25
https://datazap.me/u/atibbs2/log-157...=0&data=2-6-25
* Registered users of the site do not see these ads.
stlfd is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 10-10-2019, 12:07 AM   #2
GlarryHoodDIT
Scooby Specialist
 
Member#: 460907
Join Date: Jan 2017
Chapter/Region: RMIC
Location: Colorado
Vehicle:
2016 WRX

Default

If you're running the stage 0 map then your DAM should be starting at .688 every time your start the car- unless your turned the car off with a lower DAM the time before. So if it's rising up to 1 and then back down then that means at least part of your drive is knock free. The first log shows DAM rising and then dropping, neither of the logs show any real significant knock. It seems like the timing scheme may be a little too advanced for your car or for this tank of gas. The AF learning is probably from the Wix air filter throwing off your scaling.

None of this is happening at WOT, which is what would be concerning. Try flashing the Stage 1 map and see if that helps. It has a slightly less aggressive timing scheme at lower loads with more consistent throttle mapping. Take a few WOT logs and see what things look like.

Could also be spark plugs. What mileage are your current plugs at?
GlarryHoodDIT is offline   Reply With Quote
Old 10-10-2019, 12:18 AM   #3
WRX56
Scooby Newbie
 
Member#: 507094
Join Date: Oct 2019
Default

Any reason you didn’t go to dealer before buying AP to figure it out?
WRX56 is offline   Reply With Quote
Old 10-10-2019, 09:45 AM   #4
Mike1Juliet
Scooby Newbie
 
Member#: 486921
Join Date: Jun 2018
Chapter/Region: NESIC
Location: Upstate NY
Vehicle:
2018 WRX
Dark Gray Metallic

Default

I think you're way over thinking this and you've gone through making several changes to your car including a tune without looking at this more objectively.

Where are you located? I know up here in NY I'm experiencing fuel economy drop because its been significantly colder recently and I'm unable to reach good mpg's like I did in the summer. Its natural for gas mileage to decrease as winter approaches. Are you sure this isn't something in your driving habits? I see you did all this data collection but tbh you're looking at singular variables like af learning and stuff when this is far more complicated.
Mike1Juliet is offline   Reply With Quote
Old 10-10-2019, 04:21 PM   #5
stlfd
Scooby Newbie
 
Member#: 507240
Join Date: Oct 2019
Location: St. Louis, MO
Vehicle:
2017 WRX base
White

Default

Quote:
Originally Posted by GlarryHoodDIT View Post
If you're running the stage 0 map then your DAM should be starting at .688 every time your start the car- unless your turned the car off with a lower DAM the time before. So if it's rising up to 1 and then back down then that means at least part of your drive is knock free. The first log shows DAM rising and then dropping, neither of the logs show any real significant knock. It seems like the timing scheme may be a little too advanced for your car or for this tank of gas. The AF learning is probably from the Wix air filter throwing off your scaling.

None of this is happening at WOT, which is what would be concerning. Try flashing the Stage 1 map and see if that helps. It has a slightly less aggressive timing scheme at lower loads with more consistent throttle mapping. Take a few WOT logs and see what things look like.

Could also be spark plugs. What mileage are your current plugs at?
Thanks for the advice. I tried the stage 1 93 map early on when I still had more of a vacuum leak and I got away from it to see if that was why my mileage decreased. I loaded it again this morning and I'll try taking some logs when the af corrections settle in. Just to clarify, I was running the stage 0 stock tune on these logs.

I thought the same thing about the plugs (original ones -30k miles) so I picked up a set the other day on Amazon. I'll install them next week.
stlfd is offline   Reply With Quote
Old 10-10-2019, 04:34 PM   #6
stlfd
Scooby Newbie
 
Member#: 507240
Join Date: Oct 2019
Location: St. Louis, MO
Vehicle:
2017 WRX base
White

Default

Quote:
Originally Posted by WRX56 View Post
Any reason you didn’t go to dealer before buying AP to figure it out?
I did actually, but it was after I got the AP. I got a dead battery and set an appointment at the dealer to get a new one, but I ended up just buying a new one from Napa in the meantime. I went in for the appointment and told them what was going on with my mileage, but I don't think the fuel trims had a chance to really relearn after replacing the battery. I removed the AP before I went to the dealer, so I don't know where they were at. They said they looked at it, but they didn't do anything otherwise. I doubt they'll do anything if I go back anyway and I'd have to miss work and sit around the waiting room if they did. I'd rather just get more experience working it out for myself. Also, I wanted to buy an AP anyway, so it wan't just to look at fuel trims.
stlfd is offline   Reply With Quote
Old 10-10-2019, 04:56 PM   #7
stlfd
Scooby Newbie
 
Member#: 507240
Join Date: Oct 2019
Location: St. Louis, MO
Vehicle:
2017 WRX base
White

Default

Quote:
Originally Posted by Mike1Juliet View Post
I think you're way over thinking this and you've gone through making several changes to your car including a tune without looking at this more objectively.

Where are you located? I know up here in NY I'm experiencing fuel economy drop because its been significantly colder recently and I'm unable to reach good mpg's like I did in the summer. Its natural for gas mileage to decrease as winter approaches. Are you sure this isn't something in your driving habits? I see you did all this data collection but tbh you're looking at singular variables like af learning and stuff when this is far more complicated.
I erred on not including too much info earlier, but this has been going on for several months actually. I used to get 24-25 mpg per tank like clockwork for 2 years and then it pretty quickly got down to about 20 mpg, so I figured I should worry about it. My commute didn't change, and if anything I've been more gentle on the car. The other thing that concerned me was that on my drive home from work, I could always get 29-30 mpg on the MFD, but after I started having trouble, I struggled to get 23 or 24 on the same drive.

I plan on going the flex fuel, bolt-on route and getting a protune in the next few months so I wanted to make sure I get this resolved beforehand. The DAM drops were screwing with my head, so I really wanted someone knowledgeable to take a look and see if I had a problem. My mileage has gotten back up to 22.5 after I tightened clamps, so I think I'm on the right track. This is all according to the dash display, but I know it correlates with actual mileage, just overestimates.
stlfd is offline   Reply With Quote
Old 10-10-2019, 10:27 PM   #8
Mike1Juliet
Scooby Newbie
 
Member#: 486921
Join Date: Jun 2018
Chapter/Region: NESIC
Location: Upstate NY
Vehicle:
2018 WRX
Dark Gray Metallic

Default

Quote:
Originally Posted by stlfd View Post
I erred on not including too much info earlier, but this has been going on for several months actually. I used to get 24-25 mpg per tank like clockwork for 2 years and then it pretty quickly got down to about 20 mpg, so I figured I should worry about it. My commute didn't change, and if anything I've been more gentle on the car. The other thing that concerned me was that on my drive home from work, I could always get 29-30 mpg on the MFD, but after I started having trouble, I struggled to get 23 or 24 on the same drive. <br />
<br />
I plan on going the flex fuel, bolt-on route and getting a protune in the next few months so I wanted to make sure I get this resolved beforehand. The DAM drops were screwing with my head, so I really wanted someone knowledgeable to take a look and see if I had a problem. My mileage has gotten back up to 22.5 after I tightened clamps, so I think I'm on the right track. This is all according to the dash display, but I know it correlates with actual mileage, just overestimates.
<br />
When did you do your mods or run that stage 0 tune?

Doing more mods including flex fuel isn't gonna help your mileage. I hope you're going to a good protuner if youre doing all this.
Mike1Juliet is offline   Reply With Quote
Old 10-10-2019, 11:57 PM   #9
stlfd
Scooby Newbie
 
Member#: 507240
Join Date: Oct 2019
Location: St. Louis, MO
Vehicle:
2017 WRX base
White

Default

Quote:
Originally Posted by Mike1Juliet View Post
<br />
When did you do your mods or run that stage 0 tune?

Doing more mods including flex fuel isn't gonna help your mileage. I hope you're going to a good protuner if youre doing all this.
Hard for me to pin down, but I guess like 3 or 4 months ago. I haven't done any real mods yet, but I'm planning on putting on a Perrin turbo inlet, Turboxs fmic, and changing the plugs and air filter next weekend. When I'm ready for a protune, I'll be putting on a tbe, tgv and egr deletes, flex fuel, fuel pump, and ebcs. I don't know if I'm coming off like an idiot or something, but I know what I should and shouldn't do without a tune. I was just trying to get to the bottom of whether I have a serious issue with how my car is currently running. I'm planning on getting a tune from Ron Watson, and from what I understand, mileage should be pretty good. I don't even care too much about the mileage. I'm just anal about how the car runs and I want to learn more about it.
stlfd is offline   Reply With Quote
Old 10-11-2019, 02:59 PM   #10
Mike1Juliet
Scooby Newbie
 
Member#: 486921
Join Date: Jun 2018
Chapter/Region: NESIC
Location: Upstate NY
Vehicle:
2018 WRX
Dark Gray Metallic

Default

Quote:
Originally Posted by stlfd View Post
Hard for me to pin down, but I guess like 3 or 4 months ago. I haven't done any real mods yet, but I'm planning on putting on a Perrin turbo inlet, Turboxs fmic, and changing the plugs and air filter next weekend. When I'm ready for a protune, I'll be putting on a tbe, tgv and egr deletes, flex fuel, fuel pump, and ebcs. I don't know if I'm coming off like an idiot or something, but I know what I should and shouldn't do without a tune. I was just trying to get to the bottom of whether I have a serious issue with how my car is currently running. I'm planning on getting a tune from Ron Watson, and from what I understand, mileage should be pretty good. I don't even care too much about the mileage. I'm just anal about how the car runs and I want to learn more about it.
I think you need to go back to stock for a bit to make everything consistent. You have mods already, the AP and the stage 0 tune. It might be best to rule out everything, turn it to stock and see how it goes. I know you're anal about understanding your car but at this point it seems like you're really harping at this one number but haven't done something actually constructive yet to fix it. You could also turn it back to stock then take it to the dealer.
Mike1Juliet is offline   Reply With Quote
Old 10-11-2019, 04:52 PM   #11
uofime
Scooby Specialist
 
Member#: 421271
Join Date: May 2015
Chapter/Region: MWSOC
Location: Chicago
Vehicle:
2015 WRX
Galaxy Blue Pearl

Default

Find somewhere safe an log some pulls.
Start with second, make sure you’re not getting significant knock then do a third gear one.

You can do it as a stage zero or one.

Could be a failing cat, could be carbon build up on the intake valves, could be the plugs. At 30k I wouldn’t expect any of those really, but a performance test might help us look in the right direction.
uofime is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 12:56 PM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.