dwmccauley01 Posted October 3, 2019 Share Posted October 3, 2019 (edited) Current mods: Catless uppipe, somewhat functional CAI. Hello, I tried my best to do as much research as possible before presenting you all with my issue. I read through Bad Noodle's Subie Newbie guide and I have think I have the basic idea of it all. However, it seems I have gotten myself into problems beyond my knowledge. So to begin, I needed a new air filter. However, with my discount a Spectre CAI was about the same as a new paper filter. I was aware the car would need a tune to compensate for the differing airflow so I did research on MAF scaling for OL and CL. During my research, I came to John M's setup and MAF scaling which I though would be a good base to start from: https://legacygt.com/forums/showthread.php/70mm-intake-12-pics-123246.html For daily driving the AF corrections from learning view looked some what alright, but not the best. The 0-5.59g was around -9% and the rest were all -4-6% . The main concern, however, was the -4.00 timing pull around 5k rpm at 1.6+ g of load. Also, from logs high load caused the AFR to be pegged at 11.02 After rescaling the first time, the AF ranges looked alot better except for the 0-5.59 area which was around -6%. The knock correction in high rpms and load was reduced to -2.80 which still isnt in the safe zone. The second rescale yeilded a very acceptable AF learning table which has remained between +/- 1% for the most part. Along with the rescale, I figured I would do a few simple things while I was reflashing the car. The changes include: CL/OL loop delay to 0 Disabling AF correction in OL Timing Compensation Zeroing The Tua tables were going to be fixed because I thought it may help with the richness, but I couldnt find them for my ecu defenition. I also set the MAF scaling to 470 because the max of the MAF scaling is at 440. I pulled about 10% timing alound 2.5 g and 4k-5.5k on my base timing table to try and help with the knock. I still am not sure how to add photos on the post itself so I will attach a photo of the scaling and learning view. After the changes were made I went out for a test drive and all seemed alright except for the random ocassional knock which I assumed is normal bc I wasnt getting much feedback knock correction. However, all went downhill which I attempted a 3rd gear pull. The log will be attached. Im not sure why the throttle was stopped at 86% but I was flooring it. And of course the log stopped before i reached 6000. I noted that during the run I was getting plenty of knock at a very rich AFR, however, the ecu wasnt doing much to fix it with no feedback correction of AFR adjustment. After the throttle was let off though the IAM plunged to 0.5 which was then I knew I had a real problem. Also I noted that I had similar, but less intense knock in that area priop to the changes in tune and intake. I assumed the problem was most likely my OL scaling as I do not have a wideband yet so I havent gotten to the tables yet. Another though was that I was still getting boost error from a leaky uppipe but the boost seems pretty consistent with my tables. This is where I am stuck: running too rich means I dont have enough air coming into the engine however, the mainfold pressure seems to be inline with my tables so shouldnt there be enough air entering the engine? or maybe the CL scaling is so off that the engine thinks there is an abundance of air and decides to pump far too much fuel. Maybe the Intake temperature is too high and needs to be scaled also. Also, this may just be my misunderstanding of knock correction, but shouldnt the ECU have pulled timing and learned the correction with the excessive knock? During the pull the ECU didnt even try to correct anything untill after when it dropped the IAM to 0.5. On top of that my fine learning tables show no learned correction in the load range either. I am just kind of confused on the logic and process the ECU is going through if it went straight to pulling the IAM before correcting or learning any knock. Any input or suggestions for correcting the AFR and knock would be appreciated and I apologize in advance for my subie newbiness. Also excuse my copper wires on the intake, its temporary for now to try and keep it from destroying itself. I put all the files on a google drive folder, but I can post stuff on here if that is prefered. Edited October 3, 2019 by dwmccauley01 Link to comment Share on other sites More sharing options...
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!Register a new account
Already have an account? Sign in here.Sign In Now