| arrestor to prevent an intake manifold backfire from igniting the combustable gases within the crankcase (as some amount of fuel does get blown past the rings and creates a nice air and fuel mixture in the bottom end of the engine). One thing you should do while you have the valve covers off is remove the two 16mm pipes at the back of the driver's side exhaust valve cover. Grab them with a pair of pliers and while twisting them, pull on them and they will come out. Then using a 3/8" NPT tap, thread the holes in the valve cover and plug them with a 3/8" NPT plug. Instead of installing the PCV valves, purchase (4) 3/8" NPT plugs and plug those ports up as well. Eliminate all of the PCV pipes/hoses that connect to these ports. On the front of the intake valve covers where the other set of PCV tubes connect, instead of using the OEM hose to connect them to the turbo compressor inlet pipes, cap off the hose nipple on the turbo inlet pipes and purchase about 6 feet of 5/8" heater hose from your local auto parts store. Cut that length in half and connect them to the PCV pipes on the intake valve covers. Route the other end of these hoses downward to the ground. This will do two things:
1) You wont have to worry about the PCV system dumping loads of oil into the intake when making hard right hand turns. Oil will accumulate at the back left of the driver's cylinder head where the two PCV ports are at and when modulating the throttle through a hard right hand turn it will allow oil to be sucked into the PCV hoses and right into the intake manifold. This is why Z's smoke like $2 whores when cornering hard right at track speeds and modulating the throttle. In addition, oil making its way into the combustion chamber will effectively lower the octane rating of your fuel and will very likely cause detonation. It isn't lowering the fuel octane per-se, but the auto-ignition point of oil is much lower than gasoline and since it is mixed in with all the fuel/air within the cylinder, as soon as it reaches its autoignition temperature, it will combust and the gasoline will as well. and... 2) since you have eliminated the crankcase scavenging circuit of the PCV system, whos effect is by way of the suction created by the turbo compressor, you will not be sucking oil and oil vapor into the induction system. If you have ever inspected the inner walls of your boost pipes, intercoolers, or throttlebodies, you will note a film of oil within all of them. This also is what creates the deposits seen at the throttlebody/throttle plate. I'm not sure how extensive the smog inspection is where you live, or if they even do smog testing, but if they do more than just a exhaust gas analyzation, such as a thorough visual inspection, you would want to forego what I'm suggesting here as a visual inspection will certainly check for the presence of the PCV valves. Looking forward to seeing your project come together - by the looks of your profile you should have a pretty fun setup once you have her final tuned. :)
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