Quote:
Originally Posted by Kingtal0n
Oh it happens all the time. Almost monthly at some point I would get a call to tune an sr20. I'd say send me the pics etc... and sure enough half of them have had the pcv removed. I explain how important it is, and that I won't even tune the engine until they put the OEM pcv back on it.
Most of the time I never see them again lol. Some people don't want to do it right, they just want to copy how everybody else is doing it
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I've personally tuned many SR's RB's KA's JZ's Honda D, B, K, F series engines all running vent to atmosphere catch cans all with great results, drive-ability, reliability and power output.
Record setting Teams like Mazworx and T1 among many others both use and sell this type of catch can as it is the most efficient way to lower crank case pressure under high load/high RPM/high cylinder pressures when the most blow by is created. **for a wet sump oiling system, as mentioned above dry sump oiling can be set up much more efficiently do to the multiple high volume belt driven scavenging pumps.
I do regularly get cars in for tuning or that i Etune that do NOT have their catch can or PCV system set up correctly and in many cases for cars running a pre turbo MAF not only is their PCV set up wrong but it can also cause a bypass of un-metered air into the engine (under vacuum conditions when the OEM PCV check valve is pulled open). This is all an easy fix though and i regularly have to walk Subi and Nissan guys through this before tuning can start.
If you still don't believe throw a MAP sensor in your valve cover and do some logging with the PCV system set up different ways at high engine load/RPM. You'll find the 2 most effective methods for PCV system is: catch can that is either vented to atmosphere or routed to pre turbo intake. Either option will get net you the same crank case pressures under high load BUT the vent to atmosphere option will keep the dirty blow by fumes out of the combustion cycle. An engine is MUCH happier running 100% on clean fresh air VS having to digest/combust it's own dirty blow by gasses. This is also why you will always see every OEM use a recirculated PCV system (usually with check valve to post throttle body), it creates a closed loop system with low emissions ALL of which can be measured at the tail pipe un like a vented system.