EJ 20, boost, restrictor pill
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Hi, car is jdm forester stb auto full magnex decat k+n panel filter.
I have some ongoing running probs on another thread but, whilst investigating those and messing with my piping I discovered I didn't have a restrictor pill fitted. I did many searches and came up with the consensus that it should be fitted between the compressor nipple and the T piece which goes to the wastegate and BCS, is this right???
Anyway my car had been running at 9 psi which I thought to be low but can't remember if it's always been like that. So I messed with the pipes and found them to be brittle so replaced them and also tried a makeshift restrictor pill of approx 1.3 mm dia.
Problem now is, boost pressure seems to spike a bit sometimes up to 18 psi when I first floor it but then drops right back to 11 psi which is an improvement but I still think I can afford to run more boost safely.
So, how do I get it to build, and hold a decent boost?
Does anyone know what size pill I should be running?
What boost should my car be running / whats safe?
I'm not after mega power I just want my car to be putting out what it should and keep it reliable.
Thanks to anyone who takes time to answer
Bri
I have some ongoing running probs on another thread but, whilst investigating those and messing with my piping I discovered I didn't have a restrictor pill fitted. I did many searches and came up with the consensus that it should be fitted between the compressor nipple and the T piece which goes to the wastegate and BCS, is this right???
Anyway my car had been running at 9 psi which I thought to be low but can't remember if it's always been like that. So I messed with the pipes and found them to be brittle so replaced them and also tried a makeshift restrictor pill of approx 1.3 mm dia.
Problem now is, boost pressure seems to spike a bit sometimes up to 18 psi when I first floor it but then drops right back to 11 psi which is an improvement but I still think I can afford to run more boost safely.
So, how do I get it to build, and hold a decent boost?
Does anyone know what size pill I should be running?
What boost should my car be running / whats safe?
I'm not after mega power I just want my car to be putting out what it should and keep it reliable.
Thanks to anyone who takes time to answer
Bri
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Get to Europe - Subaru Forester Owners Forum for good Forester advice.
Not sure of the correct bore, but yes the restrictor fits between the nipple on the compressor outlet and the T-piece.
I think stock boost is 1.2 Bar (one of the S/TB or T/TB guys on the Foz forum will know), its basically the late classic WRX wagon engine (TD04, 9:1CR) you have, which is essentially the same as the same age UK turbo engine (which is slightly lower CR).
Simon
Not sure of the correct bore, but yes the restrictor fits between the nipple on the compressor outlet and the T-piece.
I think stock boost is 1.2 Bar (one of the S/TB or T/TB guys on the Foz forum will know), its basically the late classic WRX wagon engine (TD04, 9:1CR) you have, which is essentially the same as the same age UK turbo engine (which is slightly lower CR).
Simon
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Get a hold of a restrictor from a subaru dealer, buy a micro drill bit set (0.6mm-1.3mm) basically drill the restrictor out by 0.05mm each time until you reach target boost.smaller hole = greater boost, larger hole = lower boost
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