Join Date: Jun 2007
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So the AOS recirculates the possible gunky build up, while the OCC removes it from the system? If that is the case the OCC sounds like a much better idea, but is one harder to install and maintain?
Fumoto quick drain oil valves are the jam! Everybody should have one.
I'm not worried about a little gunk being recirculated back into my block because I keep my OCI's to 3k or less and I drive my car a few hundred miles every week. I'm just concerned with keeping the air and oil separated. A fair amount of the gunk inside OCC's is created by the OCC's themselves anyway. When you turn your hot engine off, condensation forms on the inside of the cans (think about it: hot/cold/metal/air) and that will eventually settle and mix with the oil that's already trapped. The gunk (minus the water) probably has decent lubricating properties anyway - anybody test it?
As for the 20G, I can say that I thoroughly enjoyed it with my stock engine, even though it was only for a few thousand miles. My stock engine had over 90k when I upgraded the turbo, so I kind of expected the catastrophic failure. Anyway, I recently had it rebuilt with forged internals and cams and I have a tune scheduled for tomorrow morning so I'll be able to provide more feedback after that. Personally, I think it's the perfect sized turbo for a daily driven WRX with a 2.5L engine. Of course, different mods will change the characteristics, but here's my old dyno graph so you can get a better idea of what kind of power it makes and when it comes on.
Mods at the time were:
IAG Big MAF intake
Perrin turbo inlet
NGK one step colder Iridium plugs
Walbro 255 fuel pump
Injector Dynamics 1000 cc injectors
Perrin crank pulley
GrimmSpeed 3 port ebcs
GrimmSpeed ported/polished stock headers w/ high flow crosspipe
Cobb catted dp
HKS Hi-Power Carbon-Ti cat back
Cobb AP V2
330 whp/338 tq
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