AOS or catch can for heavy track use - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jflogerzi · 05-09-2021, 06:14 PM

My 2013 has 80k on the Odo. I am the 4th owner and very soon it's going to become a weekend and track toy only. I have the car pretty well setup. Last oil report looked good from Blackstone but really this is the last major thing I can think of to do for the car now besides maintenance and consumables. Just looking for opinions.

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rice_classic · 05-09-2021, 08:55 PM

I haven’t found a need. Both times Ive removed the manifold there is very little oil film on anything and the valves are clean as can be due to port injectors.

Goingnowherefast · 05-09-2021, 09:00 PM

Being NA with PFI I'd say it's not really needed. These cars don't really die from detonation NA, it's usually due to oiling issues if anything. Up to you, but I would say save the money and weight.

sifl · 05-10-2021, 11:57 AM

I have raced without them, and with them. I currently have both. I have a Racer X catch can installed for my PCV, and I have a Cusco AOS on my crankcase vent.
Unlike others, I do get oil in mine. Not a lot, and I'm OK with the weight. The talk about LSPI always concerned me, even though it's less likely in the twins.
My car is NA, I usually autocross it, but I've done a few track days.
I use 0w-20 oil all the time, which is another point to consider.
I run a full season of events with a single oil change (about 400 miles), and get a Blackstone analysis, and there are no issues.

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05-09-2021, 08:55 PM	#2
rice_classic Senior Member Join Date: Jun 2012 Drives: Nevermorange FRS Location: Seattle, WA Posts: 4,160 Thanks: 755 Thanked 4,200 Times in 1,803 Posts Mentioned: 77 Post(s) Tagged: 1 Thread(s)	I haven’t found a need. Both times Ive removed the manifold there is very little oil film on anything and the valves are clean as can be due to port injectors. __________________ SCCA T4 - FRS

05-09-2021, 09:00 PM	#3
Goingnowherefast Senior Member Join Date: May 2019 Drives: AP2 S2000, 91 Miata 1.8L Rotrex 5MT Location: Detroit, MI Posts: 465 Thanks: 275 Thanked 299 Times in 187 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Being NA with PFI I'd say it's not really needed. These cars don't really die from detonation NA, it's usually due to oiling issues if anything. Up to you, but I would say save the money and weight. __________________ 2022 Hyundai Elantra N 6MT SCCA TT S3//Will be back in an 86 eventually

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05-10-2021, 11:57 AM	#4
sifl Member Join Date: Feb 2015 Drives: 2013 Subaru BRZ Premium MT Location: Milwaukee Posts: 35 Thanks: 0 Thanked 26 Times in 18 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I have raced without them, and with them. I currently have both. I have a Racer X catch can installed for my PCV, and I have a Cusco AOS on my crankcase vent. Unlike others, I do get oil in mine. Not a lot, and I'm OK with the weight. The talk about LSPI always concerned me, even though it's less likely in the twins. My car is NA, I usually autocross it, but I've done a few track days. I use 0w-20 oil all the time, which is another point to consider. I run a full season of events with a single oil change (about 400 miles), and get a Blackstone analysis, and there are no issues. Sent from my SM-G973U using Tapatalk

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