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davep
P Plater
43 Posts
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 Posted - 25 Nov 2005 : 09:24:49 AM
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Posted this on greg's site and this one.. no favourites...
There used to be a great article on 14 different types of airboxes for different brands of cars from autospeed, this is now a pay-for-use item, however I found a nice link to another forum which has copied it:
http://classic.eliserepublic.com/forum_posts.asp?TID=160&PN=2&TPN=1
(3rd or 4th post)
To summarise:
Stock V6 airbox = low cfm.
Reasons:
1) small mouth at bottom
2) the top half is square and cuts out maybe 15-20% of filtering capability by having the corner over the filter.
The solution:
1) purchase:
- S/C V6 CAI mid piece and snorkel and either cut your own airbox or buy a corresponding bottom half of airbox, factory pre-cut.
This will improve flow, BUT, looking at the article on the V8 airbox with this setup, the best flow figures come from having the VS (series 2 or 3, this is VERY IMPORTANT as the older pre-VS airboxes DO NOT have the rounded type airbox tops, the VS S2 or 3 have a nice round look to them which eliminates the 15-20% reduction in filtration as earlier described), airbox without any of the snorkel attachments. They then found that by adding the intermediate piece, a loss was obtained, then by adding the over the top of the radiator piece (from now on referred to as the OTTOTRP) further loss was observed.
Now, what to do? Do we have an open bottom section of box, get good flow, but maybe get hot air, or should we use the intermediate piece and the OTTOTRP piece anyways? What I have so far concluded is to use them anyway, but modify the OTTOTRP piece by cutting the mouth wide open over the radiator. Over the radiator, the gap for airflow is only about 10mm wide, which to me, blows.
With this solution we are still stuck with the square V6 top half of the airbox (same as early V8 ones too), I have bought a VS S2 or 3 one but I havnt figured out how to incorporate it yet. it will either be done by cutting and fibreglassing it to move the outlet for the top half so it points backwards, instead of sideways, OR rotating the intake manifold 180 degrees and relocating the alternator, but this seems like a lot of effort for probably a little gain.
Some pics here:
The mouth opened up. note also the V6 airbox that has the corner essentially closed off.
http://img46.imageshack.us/img46/7928/intake7li.jpg
The VS S2 or 3 airbox, nice and curved and flowing a lot better.
http://img483.imageshack.us/img483/8727/intake6yc.jpg
I've posted similar stuff on different boards, but it mystifies me how a lot of people cant get their head around this concept.
-dave
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mouce
National Driver
1525 Posts
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Posted - 25 Nov 2005 : 7:54:21 PM
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| Seems to make sense to me. But then again I just got a pod and piped cold air to it, that works a treat too! |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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Rattis
P Plater
21 Posts
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Posted - 28 Nov 2005 : 05:07:23 AM
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| i have flexie pipe from the throttle body all the way down to behind the bottom part of the front bumper, now i have mounted a rather large pod filter in the bottom section of them bumper. i know its not the ideal place coz of mud and crap from the road flinging up into the poddy, but to maintain it i clean it once a week. i found it runs a treat. |
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jabba
P Plater
16 Posts
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Posted - 28 Nov 2005 : 07:26:28 AM
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The VS box pictured almost looks like it could be a V8 item. Are they the same V8 to V6, or is there a V6 one where the hose exits to the rear?
j |
Keep the shiny side up and the greasy side down. |
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davep
P Plater
43 Posts
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Posted - 28 Nov 2005 : 10:11:29 AM
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The second picture, showing the top half of the airbox *is* a V8 item. The V6 Item, see right of first pic, is the V6 one. You can clearly see that the V6 item has the corner impinged upon by the outlet piping, effectivly reducing the filtration area. The article essentially says that the V8 item in the second pic owns in terms of airflow. So, what I want to do is use the V8 item (second pic), but as you can see it pokes out sideways, rahter than backwards, which makes it so far impossible to do. Hence i will have to cut it up, glue and fibreglass it to make it point backwards rather than sideways.
A lot of people do run pods, yes, but these items, unless boxed like the BA GT etc, are illegal, i'm trying to help people do things in a more legal manner.
-dave |
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Rattis
P Plater
21 Posts
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Posted - 28 Nov 2005 : 1:29:01 PM
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| pod filters are only illegal if not inside a box inside the engine bay. the minute its not in the engine bay yoy can have it breathe air from all around. |
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mouce
National Driver
1525 Posts
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Posted - 29 Nov 2005 : 9:40:49 PM
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| I actually contacted VicRoads when I was about to fit my pod and they said (and I have the printed e-mail in my glovebox) that as long as my car does not breach EPA noise and/or exhaust emissions standards then a pod filter is perfectly legal. Boxed/unboxed or piped to a new location doesn't matter. I checked it all over before I did it. |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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davep
P Plater
43 Posts
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