loganbrooks

For a 2006 JDM B Spec, EJ20Y, Logs and LV below, fuel trim starting around -10, decreases to -5 and then back to -8. Fuel trims are all over them show. Mainly sits between -13 and -5. - So far I have: -Boost leak test- Negative -Smoke test - Negative - Replaced manifold seals - Replaced intercooler - Replaced fuel injectors with another used set - Replaced FPR and fuel pump - Replaced MAF - Replaced Oxygen Sensor For the logs: Is shown after a short drive on the road then parked at idle the log is started. Second log is the same but car is taken for small drive and it shows fuel values foing from -5 upto -8. Any idea on why I am getting this fluctuating fuel trim figure? I also get the 2,800 rpm stutter as well. Thanks romraiderlog_20200423_150721.csv romraiderlog_20200423_151102.csv

Also as an update: looking at the logs it appears the only time the fuel learning figures drop into the big negative is the moment after using the throttle at reasonable levels. Sort of like this: Put foot down, mixture richens as it should to around 12, no fuel learn. Back off from throttle, mixture leans to around 20, negative fuel learn values show. Throttle re-applied, normal values and mixture back to 14.9. Issues with the factory blow off valve? Dumping to much air to account for with mixture? As far as I can tell it is this reason the LV gives such negative values, as otherwise it seems within normal limits.

Before sending my ECUs rom to Cyro for tuning, trying to sort my car out in a healthy condition. I have replaced the intercooler, checked all the known vaccum lines pre and post turbo, all connected as far as I can tell. However I still am getting negative values at low airflow: Attached is current LV shot: https://drive.google.com/file/d/11RtgIaK1c_T24V0JaAN46Q_6PRBwaL11/view?usp=drivesdk For extra info here is a log: https://drive.google.com/file/d/11MJE449cPfEpa06btnRLADrA0PBaGuyU/view?usp=drivesdk From what I can tell with my limited knowledge on this topic, at zero throttle the car is dumping fuel and the AFR goes up to 20, while on the throttle it comes back to normal readings, does that mean an airleak post turbo? Will try swap the O2 sensor, and recheck the lines. Have replaced MAF and cleaned, intercooler and seals. If anyone sees anything wihin the log I may be missing please share, any other methods of checking for airleak, particularly for ones which only seem to occur at idle throttle? Thanks

Anyone know if there are any major differences between the EJ20X and EJ20Y model. Apart from the obvious, that the X is coupled with auto transmission, Y with manual. Have an EJ20X engine and looking at installing into a manual transmission legacy, keeping within the 4th Gen legacy for simplicity.  Haven’t found much on the web, most information seems to suggest they are the same.  Any info would be appreciated,  Thanks