[flash]

the link died - here is the article from 9 Magazine, and the DIY for the airbox flow modification that dave greimann and i worked out

airboxmods.pdf Size: 709.53 KB  Downloads: 257

air box mod DIY.pdf Size: 62.62 KB  Downloads: 228

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[PorscheDude]

As these cars continue to change hands, I am sure this will benefit some new owners.

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[rhudeboye]

Where has that article been hiding? never seen it. Printing and adding it to the binder.



Thanx

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[flash]

lol - sorry - i just today realized that it got buried - this was a while ago that we worked this out, so it sort of got forgotten

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[crwindy]

968 engineering no longer has the rings for the airbox mod.

Should I bother trying to get/make rings, or just cut the holes? Do the rings have function other than making the mod look more professional?

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[pinball1008]

Nice to see the original article, it makes interesting reading.



I had problems finding trim rings in the uk, but eventually found some 2" bass tubes which did the job.

I expect there are plenty of options in the US and I'm sure that there are plenty on the site who can help.

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[flash]

i htink i need to merge a couple of threads here



yes, the trim rings make a difference - the right design (bell mouth or at least round) helps smooth airflow - the wrong design (square edges) creates turbulence - no rings creates turbulence



turbulence in this case does not mean it still won't be better - it just means a little less efficiency, and a less pleasant sound

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[xrad]

OK..I'm a believer now...and mod soon to come..

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[johns_968]

I was reading this interesting mod. Seems like something even I can do.

Question is where can I get those trim rings needed to optimize airflow into the box?

seems like the website referenced is not online any longer

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[PorscheDude]

I am not sure, but RS Barn may have them.
Worth a shot, Pete is a great help.

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[flash]

crutchfield

the company that used to carry them and where 968 engineering got them (parts express) stopped carrying the right kind

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[firefish]

If you check out hifi or car stereo suppliers you'll probably be able to find trim rings (used in speakers).

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[flash]

yup - just make sure you get ones for which you can get a hole saw the right size, and ones that have rounded entry edge profiles - the idea is to smooth the airflow going in, not make a square corner which disrupts the airflow

i've gone even farther, and have plans to do more - it's helping

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[johns_968]

I just gotten confirmation from Pete at RSbarn that he has them in stock and I am ordering them from Pete.

Thanks for the heads up

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[EEZATOY]

When I did the airbox mod I use ABS pipe coupler (21/2" to 2") from home depot for my ports - pictures are on page 9 of the thread listed below - for me it has worked out well - since then I have got the front engine cover so you don't see them at all...

Sam



http://www.968forums.com/index.php?showtop...4&hl=airbox

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[flash]

those are pretty bumpy - i am quite sure that the flow is broken up there - it's all about the bell shape, and smooth entry, essentially trying to mimic a velocity stack - square edges disrupt airflow - a contoured edge facilitates it - the more the contour, the more it helps

might be a minimal advantage in this application, but velocity stacks work - i know there is a difference between the square edge and a rounded one - you can actually hear it

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[DaveN]

<!--quoteo(post=78740:date=Aug 26 2009, 09:07 AM:name=EEZATOY)-->QUOTE (EEZATOY @ Aug 26 2009, 09:07 AM) <{POST_SNAPBACK}><!--quotec-->When I did the airbox mod I use ABS pipe coupler (21/2" to 2") from home depot for my ports - pictures are on page 9 of the thread listed below - for me it has worked out well - since then I have got the front engine cover so you don't see them at all...

Sam



http://www.968forums.com/index.php?showtop...4&hl=airbox<!--QuoteEnd--><!--QuoteEEnd-->

+1 on the ABS pipe coupler. I then used my flex shaft (commercial sized dremel) to reshape the leading edge to a pseudo-velocity stack.

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[PorscheDude]

<!--quoteo(post=78738:date=Aug 26 2009, 11:09 AM:name=johns_968)-->QUOTE (johns_968 @ Aug 26 2009, 11:09 AM) <{POST_SNAPBACK}><!--quotec-->I just gotten confirmation from Pete at RSbarn that he has them in stock and I am ordering them from Pete.

Thanks for the heads up<!--QuoteEnd--><!--QuoteEEnd-->
[img]style_emoticons/<#EMO_DIR#>/cool.gif[/img]

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[EEZATOY]

Flash,

The edges inside the coupling is actually angled (45 degree) where it goes from the 2 1/2" to 2" - so no real square edges - no to say that there isn't some air flow disruption from it not being a straight shoot, but its a readialy avaible and cheap option...

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[flash]

ah - looked like right angles from the pic - that's definitely better

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