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Old 08-21-2013, 11:28 PM   #1
Smity Subaru
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Default Ej20g boost and vacuum hose routing help

Hello, i am trying to figure out the info on the 3 port boost solenoid hoses. I can't seem to figure out which hose the restrictor pill goes in and also where the hoses go. I have a apexi intake and I don't know if the bottom solenoid hose goes to the nipple on the intake. Can anyone shed some light about the restrictor and these hoses? Thx
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Old 08-22-2013, 01:40 AM   #2
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I run my 3-port without a restrictor pill and it works fine and hits the target boost values.
I think it's only the 2 ports that have the restrictor - at least a 2 port will not run much more than wastegate pressure without a restrictor.

Bottom hose goes to the nipple on the intake.
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Old 08-22-2013, 03:33 PM   #3
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Yeah I don't think you need the restrictor pill in the EJ20G's, at least I never notice them in mine. And the hose on the bottom of the boost controller will hook up to the small nipple on the Apexi intake which can be seen here on the right hand side:



Hope this helps!
Thanks,
Rick
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Old 08-22-2013, 09:14 PM   #4
Smity Subaru
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Sweet....thx guys. Guess I wasted a $1.50 on a restrictor pill. I will jist use it on a necklace lol
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Old 08-23-2013, 11:28 PM   #5
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Incorrect. There is a factory restrictor pill in the bottom hose which is the return line from the BCS. Without the restrictor you will overboost with the stock ECU because the BCS will bleed off air from the wastegate faster than expected which keeps it closed. Ask me how I know this
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Old 08-24-2013, 04:45 AM   #6
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Very odd. I had to run the stock map a few weeks back when my last ECU chip failed. The car was doing 0.7 to 0.8 bar. Any one else running without the restrictor in the bottom hose and willing to share their experience?
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Old 08-24-2013, 09:23 PM   #7
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This was with the standard 3-port BCS and factory hose routing? If you poke around on the UK/Aus boards you will find many examples describing this. Here is one post I found with just a quick search;
http://bbs.scoobynet.com/showpost.ph...9&postcount=23

When I swapped in the motor from a '95 WRX, I changed out all the rubber vacuum lines. I initially had overboost and after research I found that the stock line was supposed to have the restrictor. I dug the original rubber hose out of the trash and sure enough, there it was. Restrictor back in, all was well.

On a side note....I am curious about your chip failure. What happened?

-Rob
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Old 08-25-2013, 12:47 AM   #8
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I guess there's just something wacky with my car.

I think the chip failure was caused by improper programming voltage and multiple erasures. I used a USB hub that didn't supply current to my programmer and I was getting errors while burning the chip . I then went through multiple erase and write cycles to try to get the map written. By the time I discovered the USB hub problem, the chip had an unwritable area near the end.

I decided to make 3 of Phil's boards as described on his site and despite my less than perfect soldering, they are working fine for me.
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Old 08-26-2013, 05:08 PM   #9
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Ah interesting. I have a couple FJ chips that were bad from the start, but nothing that have died from multiple cycles. If you ever need another dual eprom daughter boards, let me know.
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