On day#1, I installed a UPR catch can on my 2018 Challenger R/T Scat, with A-8 tranny. The car now has 10k on the clock, and it has experienced several long and spirited round trip runs in the heat of summer.I bought a upr billet catch can and installed it and drove it to work and back (about 40 minutes each way)for one day. I noticed that the exhaust note was muffled and I couldn't accelerate as quickly as before. I wonder if the oil catch can is causing some sort of restriction from thw crank case gas ventilation. I hit the internet and didn't find a definitive answer. Convincing arguments on both sides. But in the process I learned the 392 is port injected and that made me wonder why I would use a catch can anyway if the valves are gonna be cleaned by the fuel injectors?
Has anybody else felt like their catch can has robbed them of power? Did you go back to sock pcv set up or try a different catch can?
Inside the UPR catch can is nothing more than a perforated metal baffle. PCV flow enters, and is drawn down through the baffle holes, then drawn up to the top of the canister, and out to the intake. Any crankcase oil present, and due to gravity, simply drips through the baffle holes, and settles in the canister bottom. To date, the intake-to-canister section of hose contains the normaal oily PVC residue. Yet, the canister-to-intake section of hose remains clean and oil-free. I have periodically swabbed the inside of that hose section with a Q-tip (each time I empty the canister) to see if there is any oil passing through the catch can, and into the intake manifold. To my surprise, the Q-tip comes out clean every time. Any newer model UPR canisters that may have any type of "filter media" installed could possibly restrict PCV flow. But I wouldn't think a noticeable drop in engine performance would be evident, unless the PCV flow is blocked in some way. Then, I would think crankcase over-pressure would eventually cause oil leaks somewhere.
Side Note: A couple years ago, I read about someone suggesting that 392 owners pull Fuses # (29 & 31), located in the Front Power Distribution Panel, wait a few minutes, and re-install them. "Fuse #29" (Transmission), and "Fuse #31 (Engine Module). This fuse pulling trick takes the engine PCM and automatic transmission performance back to factory settings, so they can re-learn owner's driving habits, and supposedly a host of other things. I tried the guys' suggestion for Fuse #31, and I immediately noticed a positive change in the way my Scat performed. In other words, it seemed that she went from a little sluggish, back to the better performing factory settings I enjoyed on day #1. Try that and see if it helps. There are quite a few Youtube videos out there that give other people's opinions on whether this does or doesn't help in your situation.