richie2990

i had a brainwave about this issue and you could be on the right path , i was looking at data on my car and noticed the fuel compensation pids and forgot about them and i remember subaru added software instead of fixing the issue, The fuel compensation values can be adjusted but the root cause is the pulsing in the fuel system causing surging/ stumble at around the rpm you are describing , adding bigger injectors makes it worse so i was unsure if the fuel line mod fixed this issue, i have not had it with any of my cars but have heard of this issue years ago

terrible edit but a over view of the black box

Haha sorry um Richie sautell revD Subaru black box description I'll add a link after work if you can't find it

It's always to get to a good baseline with service parts , I have had this issue before and the boost / map sensor switch solenoid wasn't switching in the black box I would check that for a start

No problem and if you need to know anything else just message me , been working on these cars for well ove 15 years haha

If the solenoid to the map/ boost pressure sensor doesn't switch it will give fuel cut just something to check in the black box on a revA through revC at start up it measures atmosphere then is switched to engine vacuum/ boost if this doesn't happen it will cause fuel cut and code 45 will set as for 66 a few variables but I have a video on YouTube how those operate done years of research on these cars

Okay well years later, I converted the bg5 to revD ECU and dash and engine/gearbox and now way better setup than the ej20R setup with the annoying orange label maf that breaks solder joints all the time, looking for A4SH701H definitions , as for the ej206 I fixed that by understanding that if closed loop fueling is up the s*** it will affect the open loop so replaced narrow band sensor with a genuine one and a whole different car

I made a video on YouTube on how the black box works to help with boost issues

Hi no not easy to remove without taking intake off and , I'm sure the regulator is a part of the fuel rail if I remember correctly , pink injectors are easier to remove than the side feed yellow ones to get fuel rail off too Don't tear primary turbo intake hose when taking intake off ,they are brittle after a few heat cycles , I replaced mine with a silicone replica type

I took that system out and never had issues but left solenoid plugged in and o have.8 mm boost pill in T to waste gate and pipe number 1 and 2 , I have a video on you tube Richie sautell Subaru revD bbod And I know that is a rev A to rev C you have but similar to revD

this is a long shot 10 years on, but do you have def files for the revD ecu?

well i may have to set a few weekends a side to do this , and i have a single turbo ecu but i think i may have to change the cam and crank pick up trigger wheels as i am sure they are different in the single turbo engines as when i have swapped these engine in the past i have come across this issue i will keep my BH5 twin as it goes very good after reducing the vod to 200 RPM but the bg5 can go single turbo

Just wondering can a single turbo setup work with a twin turbo ecu ? i am wondering if anyone has done this ? i understand that the bbod would still have to be plugged in but not use to to control boost control , i am happy with the rev D setup and i have a rev B bh5 which i may just single turbo , just wondering if anyone has done this ?

I have a bh5 subaru legacy MY2000 revB , i had some issues with the secondary turbo boosting , it used to get up and take off but after fixing a unmetered air leak before the primary turbo it seems to be a but flat , i have checked for any vacuum leaks with brake clean and in diagnostic mode i sprayed around secondary componets and no change in idle , i understand that under boost there will be more chance of air escaping but , i use the scan tool at work thats for hyundai on OB2 funtion and on secondary its giving a reading of 127 kpa on the map sensor , and i noticed that the IACV in diagnotic mode moves erratic and i tested the earth output with the bbod disconnected and it had no earth output from the ECU as the bbod is earth switched from my findings and normally is from most manufactures , anyway with the bbod plugged in the IACV solienoid clicks away getting a earth so i am unsure where this is coming from and also i have a BG5 and tested that and does the same thing has anyone else come across this ? i dont throw parts at cars i want to test things before replacing that was how i was trained