![]() ![]() ![]() ![]() Am I making myself clear?Īm I missing something? Ive also read that the oem hose that connects the exhaust side VC fitting to the turbo intake has a restrictor in it, but im sure this is only to restrict the flow of the suction created by the turbo at higher rpm's, Im guessing that without a restrictor you could suck drops of oil and shit, which when using an operational catch can this isn't too much of an issue. Fumes in the intake side VC get sucked out first, then suction continues through the crossover hose and reaches the "t" fitting on the exhaust side VC, splitting its suction power into both the exhaust side VC and the turbo intake valve cover hose. The problem Im seeing here is that during idle when the pcv valve is open and sucking gases and fumes (along with a little oil) it is also sucking air through the turbo intake port (clean/filtered and measured air), wasting some of its vacuum power due to the fact that this air passage is always open to flow. Apparently rb25 heads dont have any oil galleries that allow oil and fumes to move from intake side to exhaust side and vise-versa, hence the need of a crossover hose that connects both valve covers. With the rb's though, im having a little trouble understanding something. It creates suction in the crankcase while idling via the pcv valve port, and while underboost via the turbo intake port. IMO, this is the most optimal way to evacuate as much gases/fumes as possible from the crankcase. This is the way many cars come from the factory, including n/a ones. Stock rb's come with a valve cover mounted pcv valve connected post throttle body that only opens up for crankcase gases evacuation during idle, and a ventilation port that is always flowing connected to the turbo intake, between the maf and the turbo. ![]() I really hope we can discuss our different ideas in here since I've been giving it a though for some time now. Im trying to figure out my rb25det pcv system here and I though I make a discussion thread since I couldnt find a thread dedicated to the rb25 pcv, and the sr20 has a different system. ![]()
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