Mrs. Jav and I attended an Audi Club event called Quattrofest this weekend. It's a 2-day motorsports festival with a driver's skills clinic and autocrocross on Saturday and two full days of HPDE (with the DSC/AX folks joining the HPDE Sunday). I finally got the S4 to a good spot with a new South Bend Stage 2 Endurance clutch and 4-piston Brembo fixed-caliper brakes so Mrs. Jav took that and had a ball. It did really well, though it's still way too much power and weight for the brakes for extended dry lapping. I took the 986 S and spent all 10 session destroying everyone in the corners and losing every single drag race down the straights. I did get a check ride from the head instructor guy so I guess I can instruct for them now too? Anyways, it had a single oil smoke burp hiccup but was otherwise a champ. Each car/driver did 10 full 20-minute sessions over the course of two days for 200 minutes of track time. Here's the video:
What's the story on the oil smoke burp hiccup?
Had a paddock mate with a Cayman and he fumigated the entire area. The extent of the story I got from him was that there's an air/oil separator part from the GT3 that addre$$es the issue.
Actually, I recall him saying there is more than one issue tracking the car that is best addressed by putting GT3 parts on the car.
My dad's Cayman S did the same thing at Nelson Ledges. It is pretty common and there are a couple causes.
1. Bad air/oil separator.
2. For track work where sustained Gs are common, run the oil level at 3/4 to avoid fogging for mosquitoes. If you run full, the oil expands when hot and can get somehow get into the combustion chambers (not sure of the path though). If you need to drain some oil, pull off the oil filter housing and drain that a couple of times.
Also nice work on the cars! My dad will be tracking his S4 next year so I'll be following your build!
docwyte
PowerDork
11/8/21 3:19 p.m.
There's a Porsche Motorsports Air/Oil separator that is a "must do" for track driven Boxster/Caymans
docwyte said:
There's a Porsche Motorsports Air/Oil separator that is a "must do" for track driven Boxster/Caymans
Do you have a link or part number? Much appreciated!
docwyte said:
There's a Porsche Motorsports Air/Oil separator that is a "must do" for track driven Boxster/Caymans
The Motorsport AOS is big dollars. You can also add a 1/2 quart pan spacers, run 1/2 quart lower and a new AOS. You can also do the ultimate AOS mod per Rennlist and that may fix your issue. If you go to Rennlist and read about the ultimate AOS it's a huge rabbit hole. Suffice it to say PCV system issues on German cars are a real thing.
docwyte
PowerDork
11/8/21 6:07 p.m.
In reply to AnthonyGS (Forum Supporter) :
Yeah but it works. I'm willing to pay for things that work.
docwyte
PowerDork
11/8/21 6:09 p.m.
In reply to Javelin (Forum Supporter) :
Sorry, but since I don't need it on my 996 Turbo I don't have links or any part numbers for it....
Had to see for myself, this was the first link I clicked on - https://lnengineering.com/shop-by-model/porsche-987/porsche-motorsports-aos-air-oil-separator-98710792600.html
$1980!!! and doesn't include the bolts, I guess the Porsche Motorsports tax is even higher than the Porsche tax. Having said that if it keeps the oil in the engine and that keeps the engine running it's worth the price.
AnthonyGS (Forum Supporter) said:
docwyte said:
There's a Porsche Motorsports Air/Oil separator that is a "must do" for track driven Boxster/Caymans
The Motorsport AOS is big dollars. You can also add a 1/2 quart pan spacers, run 1/2 quart lower and a new AOS. You can also do the ultimate AOS mod per Rennlist and that may fix your issue. If you go to Rennlist and read about the ultimate AOS it's a huge rabbit hole. Suffice it to say PCV system issues on German cars are a real thing.
I kind of came to the conclusion that this is the kind of stuff that no one admits to in German cars, but is the same sort of things that people would say adds character to an Italian one.
In reply to Javelin (Forum Supporter) :
When you see an AOS you won't think that's a great deal. A genuine Porsche AOS is about $100 including the Porsche tax. It's a $20 piece of plastic at best. Go read the ultimate AOS thread and see them cut apart.
P.S. some dude named Jake something or other has said the ultimate AOS is probably the way to go too. Again read.....
In reply to AnthonyGS (Forum Supporter) :
I'm willing to make my own!
Javelin (Forum Supporter) said:
In reply to AnthonyGS (Forum Supporter) :
I'm willing to make my own!
Then I see an ultimate AOS in your future. Porschetech on RL will help you. I might even copy you. Seriously a catch can and PCV combination shouldn't cost $1k, especially since on a Porsche no one gets to see it like the blingy catch cans.
I think "Jake" is Jake Raby, who's a well known Porsche engine builder. He knows his stuff.
AnthonyGS (Forum Supporter) said:
Javelin (Forum Supporter) said:
In reply to AnthonyGS (Forum Supporter) :
I'm willing to make my own!
Then I see an ultimate AOS in your future. Porschetech on RL will help you. I might even copy you. Seriously a catch can and PCV combination shouldn't cost $1k, especially since on a Porsche no one gets to see it like the blingy catch cans.
I just finished reading the UAOS rabbit hole and... I am not impressed. Some self-proclaimed Porsche Tech came up with disabling the stock AOS (but leaving it in place), adding in a larger VAG AOS (that others tried before without success because the larger diaphragm would collect oil and dump it into the engine at throttle lift-off causing an oil-induced over-rev), and then added a bunch of extra weight and complexity with sensors and drains. All of which looks to be nearly impossible to install on a 986 versus a 996 and still costs $1000 when it's all done. I think it's telling that Jake still uses the Porsche Motorsports AOS on most of his builds. (Which incidentally is cheaper than buying an UAOS)
Jake Raby's own site: https://flat6innovations.com/excessive-oil-consumption/
AOS:
In most cases the AOS failure is caught in time, and repairs typically include new spark plugs, O2 sensors, and catalytic converters. Replacing the AOS with a genuine Porsche replacement is a must- do NOT trust aftermarket knockoff units!
Javelin (Forum Supporter) said:
Jake Raby's own site: https://flat6innovations.com/excessive-oil-consumption/
AOS:
In most cases the AOS failure is caught in time, and repairs typically include new spark plugs, O2 sensors, and catalytic converters. Replacing the AOS with a genuine Porsche replacement is a must- do NOT trust aftermarket knockoff units!
That's why I have a genuine one in the garage for my Boxster. Saving $50 isn't worth it to me, but I can't justify $1k for the motor sports AOS either. It's just not that complex of a part.
It's just really irritating how much grime German cars get in the intake because the PCV systems suck so much.
In reply to AnthonyGS (Forum Supporter) :
My direct injection German cars all have grimey intakes, but not the port injection ones. The AOS/PCV do suck though.
