STELAN Aftermarket AOS

[steved0x]

Originally Posted by stelan

this AOS drains into the block via the large block opening so I don't see a problem.

Can you share more details, the screw and the rubber plug blocks the original small return opening, can you share more about the new bigger location for the oil to drain to?

[stelan]

Originally Posted by steved0x

Can you share more details, the screw and the rubber plug blocks the original small return opening, can you share more about the new bigger location for the oil to drain to?

Original 2.5 and 2.7 AOS drains thru small opening in the block that proved to be a design issue as it does not drain fast enough under certain conditions, this small opening is not used in the stelan AOS as it drains thru the larger intake at the bottom of the manifold. that is why the small opening gets blocked by the plug.

On the 3.2. 99610702601 (later larger drain AOS) I will have the manifold drain thru both larger intake and original larger drain locations for even better oil return as the larger displacement is more demanding. the R&D I have is to do is to make sure system volume is appropriate for fuel trims, etc.

[Gelbster]

Stelan,
Sounds promising.
Just a thought - the PCV intended for a 1.8L VW may have inadequate vacuum flow for the 3.2L ? Use one intended for a larger engine? See Post 47 for the Audi Part #.
But a generic would be cheaper.

[stelan]

Originally Posted by Gelbster

Stelan,
Sounds promising.
Just a thought - the PCV intended for a 1.8L VW may have inadequate vacuum flow for the 3.2L ? Use one intended for a larger engine? See Post 47 for the Audi Part #.
But a generic would be cheaper.

good call however the 1.8t is well capable of flowing more than enough, that is not an issue. diaphragm in both oem 2.5/2.7 and 3.2 are similar, the amount of flow is dictated by the rapid opening and closing vibrations of the diaphragm based on TB pressure/vacuum signal.

[Gelbster]

This link with graphs and references and FAQ may help others understand what we are talking about:
High Performance PCV Valve Shootout – Flow Test Results | M/E Wagner Performance Products

[steved0x]

Originally Posted by stelan

On the 3.2. 99610702601 (later larger drain AOS) I will have the manifold drain thru both larger intake and original larger drain locations for even better oil return as the larger displacement is more demanding. the R&D I have is to do is to make sure system volume is appropriate for fuel trims, etc.

2003/2004 only right? Up through 2002 uses the smaller hole, even on the 3.2? That is what blocks us from using the larger Porsche "Motorsports" dual canister AOS, although I have seen one installation that did it somehow using a hose and a clamp, maybe they drained it to the larger place that you are using?

[stelan]

Originally Posted by steved0x

2003/2004 only right? Up through 2002 uses the smaller hole, even on the 3.2? That is what blocks us from using the larger Porsche "Motorsports" dual canister AOS, although I have seen one installation that did it somehow using a hose and a clamp, maybe they drained it to the larger place that you are using?

that's correct, that's why I think I will include the plug so accommodates all situations
the motorsport one besides the need to adapt it's physically huge (in price too lol).

[Jake Raby]

Originally Posted by stelan

Original 2.5 and 2.7 AOS drains thru small opening in the block that proved to be a design issue as it does not drain fast enough under certain conditions, this small opening is not used in the stelan AOS as it drains thru the larger intake at the bottom of the manifold. that is why the small opening gets blocked by the plug.

On the 3.2. 99610702601 (later larger drain AOS) I will have the manifold drain thru both larger intake and original larger drain locations for even better oil return as the larger displacement is more demanding. the R&D I have is to do is to make sure system volume is appropriate for fuel trims, etc.

Fuel trim is the hardest part, and the most important.

This is the thing that has blocked 100% of my attempts to do this for the past decade. Things like deceleration recovery, and extended WOT operation are where the things get hairy the fastest, and this is when the volume of the unit and engine displacement, and output will come into play.

Issues driving down the road normally can be experienced too, and remember, long term fuel trim values can take hundreds of miles to show an issue. This is what takes so much time, since every change to the unit/ design/ etc takes days of driving to actually compare.... A stand alone data logger with a 2 channel manometer is the best tool for this job, so you can plot the vacuum changes in inches of water values. Overlaying that data with fuel trim plots gathered at the same time, and MAF signal can help see the real story of the changes that you made.

The other road block that we've had is far from that of a developmental hiccup, as the AOS is an emissions component, and it's pretty easy to get in trouble when bringing something to market that's considered an emissions related item. I have two products developed for ''tis very issue at the present, but we can't sell them without a large amount of liability and risk.

Maybe these things help stimulate thought on your end.