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Old 10-28-2020, 08:13 AM   #235
Member#: 198281
Join Date: Dec 2008
Chapter/Region: MAIC
Location: Virginia
2005 WRX/STi
WRB of course


Originally Posted by brecks View Post
Iím somewhat stumped here, and given the info youíve posted, this could even indicate the pump is oversized, no? Itís been mentioned that using an 11mm pump on SAVCS is too much pump and leads to aerating/pressure drop. But in certain circumstances, could even the 10mm be too large for a single AVCS engine? The pressure drop doesnít really concern me, except for on the track where that 75psi can get closer to 65psi
Can you e-mail me a log?

-10 lines are the smallest we recommend and should be fine for your RPM. Who's kit? Some have garbage fittings and/or sandwich adapters that can have funky issues with turbulence or pressure drop at certain RPMs.

DBB turbo? What's that? BB or journal? What size restrictor?

Were the pump clearances checked?

Very rare to have bypass issues on the 10mm; it's well matched to that engine. I've seen the 10mm pump work flawlessly to 10,000 RPM on these engines so I don't think it's an issue of RPM.
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