Need Help With Header
03-16-2003, 04:42 PM
#21
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Originally Posted by pengaru' date='Mar 15 2003, 08:26 PM
So how do you like the header now that it's installed?
I'm not sure if I notice the power difference, but I have yet to go all out with it installed. And I'm sure the stock catback has an effect on the power. I will get the rest of the RB system later, hopefully.
03-16-2003, 09:02 PM
#22
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that little hole where the header meets the engine is what activates the aux ports. Reconnecting that pipe that runs to the cat won't do **** for the ports, it's there to pump air into the cats. Why does everyone think it's for the aux's?
03-16-2003, 10:13 PM
#23
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Originally Posted by rotary>piston' date='Mar 16 2003, 08:02 PM
that little hole where the header meets the engine is what activates the aux ports. Reconnecting that pipe that runs to the cat won't do **** for the ports, it's there to pump air into the cats. Why does everyone think it's for the aux's?
03-16-2003, 11:15 PM
#24
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</span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (rotary>piston @ Mar 17 2003, 03:02 AM)</td></tr><tr><td id='QUOTE'> that little hole where the header meets the engine is what activates the aux ports. Reconnecting that pipe that runs to the cat won't do **** for the ports, it's there to pump air into the cats. Why does everyone think it's for the aux's? [/quote]
well, you obviously don't have any idea what you're talking about.
see the tube running along the bottom of the LIM here, it's on the top of the LIM in the pic due to it being oriented upside down. Note this thread is in the context of S4 NA, and so are these pictures:
that tube, goes to both sides of the LIM, with banjo fittings connecting them to passages that lead to the auxillary port actuators.
Now, that tube also has a inlet tube, which branches out from it here:
See the inlet sticking out toward the lower left of the picture? Thats part of the same system, and that inlet connects to the rubber hose that forks off from the split air pipe. Thats the same pipe you claim is only there for injecting air into the catalytic converter. Bzzt, wrong.
And here you can sortof see the banjo fitting (at least the bolt that screws it into the LIM stickign out the side) and the rest of the tube...
There is also a check valve in the split air tube, it is after the fork for the rubber hose that provides the exhaust gases to this litle tube under the LIM... so this tube sees exhaust gas/pressure. The check valve prevents the exhaust gas from going to the AC&CV though only permitting air to be pumped into it when the AC&CV wants the air pump air to go into the catalytic converter.
so, as you can see, that hole you refer to has nothing to do with aux port actuation.
well, you obviously don't have any idea what you're talking about.
see the tube running along the bottom of the LIM here, it's on the top of the LIM in the pic due to it being oriented upside down. Note this thread is in the context of S4 NA, and so are these pictures:
that tube, goes to both sides of the LIM, with banjo fittings connecting them to passages that lead to the auxillary port actuators.
Now, that tube also has a inlet tube, which branches out from it here:
See the inlet sticking out toward the lower left of the picture? Thats part of the same system, and that inlet connects to the rubber hose that forks off from the split air pipe. Thats the same pipe you claim is only there for injecting air into the catalytic converter. Bzzt, wrong.
And here you can sortof see the banjo fitting (at least the bolt that screws it into the LIM stickign out the side) and the rest of the tube...
There is also a check valve in the split air tube, it is after the fork for the rubber hose that provides the exhaust gases to this litle tube under the LIM... so this tube sees exhaust gas/pressure. The check valve prevents the exhaust gas from going to the AC&CV though only permitting air to be pumped into it when the AC&CV wants the air pump air to go into the catalytic converter.
so, as you can see, that hole you refer to has nothing to do with aux port actuation.
03-17-2003, 08:16 AM
#26
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no problem, the emissions related stuff on this thing can get confusing. There are alot of passages integrated into the LIM and engine housings that many people misunderstand.
If you inspect your LIM while it's off the car and try blowing through various ports with the AC&CV removed it will likely help clear some things up... some things to note that arent entirely obvious are:
There are holes in the exhaust port sleeves inside the rotor housings, those holes provide an exhaust interface to passages *inside* the rotor housings, from the rotor housings the passages continue into the intermediate and side housings. The details vary depending on the series, S5 has no EGR valve on the intermediate but does have an exhaust port under the primary intake ports where S4 does have the EGR valve (utilizing this exhaust interface) but does not have the additional port under the primary intake ports. Both S4 and S5 have exhaust ports under the secondary intake ports. If you look at your LIM on the face that mates with the engine there are weird shaped ports under the secondary intake runner ports. Those holse match up with exhaust ports on the end housings... they provide an interface into the exhaust via the aforementioned passages, into the exhaust port sleeves. The hole mentioned before by rotary>piston is also an interface into the same system that normally goes into the stock manifold... you have it blocked with a header. But the holes in the sleeves still remain.
The purpose of these ports interfacing with the exhaust system on the LIM is for the AC&CV... if you blow in the holes you will find the pressure escaping from where the AC&CV was, provided you have it removed and not blocked.. if it's blocked off you won't be able to blow if you plug up the other holes that would meet up with the engine for the experiment.
You can also observe where the tube exiting the rear of the LIM (where the split air pipe connects after the check valve) ends up leading to internally, by blowing in it with no AC&CV installed and no blockoff plate. The AC&CV controls a handful of junk, but once you have blocked it off with a plate these passages are all meaningless.... because they all meet at the AC&CV.
The above was typed from memory so some of the details may be off slightly, you can confirm this stuff for yourself easily though by just blowing in various holes in a LIM while plugging other various holes... it can be quite fun actually and helps get a clear picture of what all goes on inside that piece of cast aluminum... defininitely a recommended activity for those curious. You might want to find a way to do it without using your mouth though
fortunately for you, the aux ports are completely independant of this mess...
If you inspect your LIM while it's off the car and try blowing through various ports with the AC&CV removed it will likely help clear some things up... some things to note that arent entirely obvious are:
There are holes in the exhaust port sleeves inside the rotor housings, those holes provide an exhaust interface to passages *inside* the rotor housings, from the rotor housings the passages continue into the intermediate and side housings. The details vary depending on the series, S5 has no EGR valve on the intermediate but does have an exhaust port under the primary intake ports where S4 does have the EGR valve (utilizing this exhaust interface) but does not have the additional port under the primary intake ports. Both S4 and S5 have exhaust ports under the secondary intake ports. If you look at your LIM on the face that mates with the engine there are weird shaped ports under the secondary intake runner ports. Those holse match up with exhaust ports on the end housings... they provide an interface into the exhaust via the aforementioned passages, into the exhaust port sleeves. The hole mentioned before by rotary>piston is also an interface into the same system that normally goes into the stock manifold... you have it blocked with a header. But the holes in the sleeves still remain.
The purpose of these ports interfacing with the exhaust system on the LIM is for the AC&CV... if you blow in the holes you will find the pressure escaping from where the AC&CV was, provided you have it removed and not blocked.. if it's blocked off you won't be able to blow if you plug up the other holes that would meet up with the engine for the experiment.
You can also observe where the tube exiting the rear of the LIM (where the split air pipe connects after the check valve) ends up leading to internally, by blowing in it with no AC&CV installed and no blockoff plate. The AC&CV controls a handful of junk, but once you have blocked it off with a plate these passages are all meaningless.... because they all meet at the AC&CV.
The above was typed from memory so some of the details may be off slightly, you can confirm this stuff for yourself easily though by just blowing in various holes in a LIM while plugging other various holes... it can be quite fun actually and helps get a clear picture of what all goes on inside that piece of cast aluminum... defininitely a recommended activity for those curious. You might want to find a way to do it without using your mouth though
fortunately for you, the aux ports are completely independant of this mess...
03-17-2003, 08:24 AM
#27
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good to know...I recently had the LIM off, hopefully I won't have it off again for a long time, but I'll take your word for it
I just try to do everything right the first time, so I want to be sure I'm not blocking something that needs to be opened, or leaving something that should be removed, or open something that should remain shut...you get the idea. I think I'm doing good so far.
I just try to do everything right the first time, so I want to be sure I'm not blocking something that needs to be opened, or leaving something that should be removed, or open something that should remain shut...you get the idea. I think I'm doing good so far.
03-17-2003, 08:55 AM
#28
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Originally Posted by Baldy' date='Mar 17 2003, 02:24 PM
good to know...I recently had the LIM off, hopefully I won't have it off again for a long time, but I'll take your word for it
I just try to do everything right the first time, so I want to be sure I'm not blocking something that needs to be opened, or leaving something that should be removed, or open something that should remain shut...you get the idea. I think I'm doing good so far.
I just try to do everything right the first time, so I want to be sure I'm not blocking something that needs to be opened, or leaving something that should be removed, or open something that should remain shut...you get the idea. I think I'm doing good so far.
03-17-2003, 09:03 AM
#29
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I was going to get the old rubber hose off that connects the air pipe, so I could get the correct replacement pipe size. I couldn't get it off yesterday, as pathetic as that sounds, but hopefully I'll get it today.
03-18-2003, 07:27 AM
#30
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ok, it took some clever bending to get the split air pipe to fit in again, but it's in. I attached the vacuum hose, but the larger rubber hose (I used heater hose) kept kinking and flattening...but I don't really need that, do I? I mean, judging by other info, now I only need the small hose leading to the LIM, right?
and it never opened my aux ports...I think the air pipe isn't sitting flush and is leaking air, but I'll figure something out this week
and it never opened my aux ports...I think the air pipe isn't sitting flush and is leaking air, but I'll figure something out this week