open vs. closed dumptube
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Joined: Apr 2003
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Re: (patdemps)
theres a topic going around about using screens, you just use a big Q-clamp, cut a piece of screen(or 2 like i use) then push it over the intake and tighten the Q-clamp around it. as for the loudness, once i get sick of it i'l prly put a lawnmower muffler inline witht the dump tube, but for now, it stays
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From: ME
Re: (DaX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX »</TD></TR><TR><TD CLASS="quote">I've never heard any loud nasty sounds at full boost. I run no filter [only screen] so maybe the loud *** turbo is covering the sound of the dump? I don't re-route my dump into my exhaust, but I have a dump tube that is about 24" - 30" long.</TD></TR></TABLE>
thats weird. i thought my friend was the only one. I put a revhard kit on his b18b and you can't hear when it opens at all. I did 2 external dumps in the last couple weeks and both are extremely distinct and loud when they open. Confusing, but as long as it works fine who cares
thats weird. i thought my friend was the only one. I put a revhard kit on his b18b and you can't hear when it opens at all. I did 2 external dumps in the last couple weeks and both are extremely distinct and loud when they open. Confusing, but as long as it works fine who cares
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From: schooling kids in ny, usa
Re: (Bailhatch)
i also was running the screen instead of filter. i doubled it over and i find it hard to believe that any particle of substance would make it into the turbo.
a little off topic, but one of my friends is running an open dump on his car(vr6) and its quite possibly the loudest thing ive ever heard. he gets on it and people a half mile away are looking around like what the **** was that??!
a little off topic, but one of my friends is running an open dump on his car(vr6) and its quite possibly the loudest thing ive ever heard. he gets on it and people a half mile away are looking around like what the **** was that??!
Re: (wongf22b2)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wongf22b2 »</TD></TR><TR><TD CLASS="quote">I'm kinda new to this does anyone have a write up on the difference between open and closed wg? What's the point of rerouting "un-needed" air into the system in a closed setup?</TD></TR></TABLE>
As you know, the wastegate controls the flow of exhaust gasses [not just "un-needed air"] through the turbine. In some if not most states, it is illegal to have an open dump tube because you are simply venting raw exhaust gasses to the atmosphere. In a closed system, you re-enter the gasses that have flowed through the wastegate back into the main exhaust system downstream of the turbo. This allows the gasses that have passed through the wastegate [and essentially around the turbo] to still pass through the catalytic converter as well as the rest of the exhaust system. This is undesirable to some people, because it is thought that unless you have a very shallow [low angle] re-entry into the main exhaust stream, you are hindering the flow of exhaust and therefore causing backpressure, thus robbing horsepower. I run an open dump because making a closed dump system would have been hell. I run no catalytic converter as it is, so having a closed dump for the sake of the environment would do no good. If you do run an open dump, you should still have some sort of tube to direct the gasses out of the engine bay, or a number of bad things can happen [melting hoses, overheating radiator, sucking raw exhaust into compressor, etc.].
As you know, the wastegate controls the flow of exhaust gasses [not just "un-needed air"] through the turbine. In some if not most states, it is illegal to have an open dump tube because you are simply venting raw exhaust gasses to the atmosphere. In a closed system, you re-enter the gasses that have flowed through the wastegate back into the main exhaust system downstream of the turbo. This allows the gasses that have passed through the wastegate [and essentially around the turbo] to still pass through the catalytic converter as well as the rest of the exhaust system. This is undesirable to some people, because it is thought that unless you have a very shallow [low angle] re-entry into the main exhaust stream, you are hindering the flow of exhaust and therefore causing backpressure, thus robbing horsepower. I run an open dump because making a closed dump system would have been hell. I run no catalytic converter as it is, so having a closed dump for the sake of the environment would do no good. If you do run an open dump, you should still have some sort of tube to direct the gasses out of the engine bay, or a number of bad things can happen [melting hoses, overheating radiator, sucking raw exhaust into compressor, etc.].
Joined: Apr 2003
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From: Worcester, MA, USA
Re: (patdemps)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by patdemps »</TD></TR><TR><TD CLASS="quote">
im thinking about ditching my filter and throwing a screen on my turbo so I can hear it more over the open wastegate. i love the sound however, id like to quiet it up just a bit and i want to hear the turbo more. plus i hear quite a few guys are running a screen....i just need to get a bit more info on how to mount it on the turbo, etc before i do it.</TD></TR></TABLE>
A screen is a lot more restrictive than an air filter.
im thinking about ditching my filter and throwing a screen on my turbo so I can hear it more over the open wastegate. i love the sound however, id like to quiet it up just a bit and i want to hear the turbo more. plus i hear quite a few guys are running a screen....i just need to get a bit more info on how to mount it on the turbo, etc before i do it.</TD></TR></TABLE>
A screen is a lot more restrictive than an air filter.
Joined: Oct 2003
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From: Queens, NY, U.S.
Re: (DaX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaX »</TD></TR><TR><TD CLASS="quote">
As you know, the wastegate controls the flow of exhaust gasses [not just "un-needed air"] through the turbine. In some if not most states, it is illegal to have an open dump tube because you are simply venting raw exhaust gasses to the atmosphere. In a closed system, you re-enter the gasses that have flowed through the wastegate back into the main exhaust system downstream of the turbo. This allows the gasses that have passed through the wastegate [and essentially around the turbo] to still pass through the catalytic converter as well as the rest of the exhaust system. This is undesirable to some people, because it is thought that unless you have a very shallow [low angle] re-entry into the main exhaust stream, you are hindering the flow of exhaust and therefore causing backpressure, thus robbing horsepower. I run an open dump because making a closed dump system would have been hell. I run no catalytic converter as it is, so having a closed dump for the sake of the environment would do no good. If you do run an open dump, you should still have some sort of tube to direct the gasses out of the engine bay, or a number of bad things can happen [melting hoses, overheating radiator, sucking raw exhaust into compressor, etc.].</TD></TR></TABLE>
Thanks for clearing that up, well explained. So it's basically for environmental issues... so people with open set-up's... how do they pass inspections etc.. etc.. or maybe they just don't pass them technically and pay the mechanic?
As you know, the wastegate controls the flow of exhaust gasses [not just "un-needed air"] through the turbine. In some if not most states, it is illegal to have an open dump tube because you are simply venting raw exhaust gasses to the atmosphere. In a closed system, you re-enter the gasses that have flowed through the wastegate back into the main exhaust system downstream of the turbo. This allows the gasses that have passed through the wastegate [and essentially around the turbo] to still pass through the catalytic converter as well as the rest of the exhaust system. This is undesirable to some people, because it is thought that unless you have a very shallow [low angle] re-entry into the main exhaust stream, you are hindering the flow of exhaust and therefore causing backpressure, thus robbing horsepower. I run an open dump because making a closed dump system would have been hell. I run no catalytic converter as it is, so having a closed dump for the sake of the environment would do no good. If you do run an open dump, you should still have some sort of tube to direct the gasses out of the engine bay, or a number of bad things can happen [melting hoses, overheating radiator, sucking raw exhaust into compressor, etc.].</TD></TR></TABLE>
Thanks for clearing that up, well explained. So it's basically for environmental issues... so people with open set-up's... how do they pass inspections etc.. etc.. or maybe they just don't pass them technically and pay the mechanic?
Some states and locations don't require cars to be inspected. I live in GA, where parts are non-inspection...but where I live, all I have to do is pass an emission test. I don't have a Ref looking through my car to see what is and isn't legal. Honestly, I don't think most Emission Testers could tell a turbo from fuel filter.
It does help to know someone though...that's how some people I know pass without a catalytic converter.
It does help to know someone though...that's how some people I know pass without a catalytic converter.
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From: Margaritaville
Re: (JDMCRX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMCRX »</TD></TR><TR><TD CLASS="quote">I have open dump love it ******* makes the car sound mean. V8 guys here are like WTF when my 4 door is raping there cars lol.
There was a post on here a while ago this guy did a test and it was like 15-18hp gain with open dump on his loud.</TD></TR></TABLE>
Anyone have a link to this? I did a search on dumptube and couldn't find it.
There was a post on here a while ago this guy did a test and it was like 15-18hp gain with open dump on his loud.</TD></TR></TABLE>
Anyone have a link to this? I did a search on dumptube and couldn't find it.
Re: (JDMCRX)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMCRX »</TD></TR><TR><TD CLASS="quote">I have open dump love it ******* makes the car sound mean. V8 guys here are like WTF when my 4 door is raping there cars lol.
There was a post on here a while ago this guy did a test and it was like 15-18hp gain with open dump on his loud.</TD></TR></TABLE>
Are you sure it wasn't open downpipe and not open dump?
There was a post on here a while ago this guy did a test and it was like 15-18hp gain with open dump on his loud.</TD></TR></TABLE>
Are you sure it wasn't open downpipe and not open dump?
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From: Margaritaville
Re: (adictionbass)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adictionbass »</TD></TR><TR><TD CLASS="quote">This might be off topic, but are there any guys running 400+ whp that can pass a sniffer test?</TD></TR></TABLE>
Not likely on a 1.6-1.8 liter Honda.
Not likely on a 1.6-1.8 liter Honda.
Re: (adictionbass)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adictionbass »</TD></TR><TR><TD CLASS="quote">This might be off topic, but are there any guys running 400+ whp that can pass a sniffer test?</TD></TR></TABLE>
Just the sniffer? I don't think horsepower is a factor...if you have a good tune [i.e. - good AFR out of boost] you should be fine. The only way I think it could be a factor is that most high HP applications don't run a cat.
Just the sniffer? I don't think horsepower is a factor...if you have a good tune [i.e. - good AFR out of boost] you should be fine. The only way I think it could be a factor is that most high HP applications don't run a cat.
Re: (adictionbass)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adictionbass »</TD></TR><TR><TD CLASS="quote">This might be off topic, but are there any guys running 400+ whp that can pass a sniffer test?</TD></TR></TABLE>
shietz...if MN ever got back into doing the sniffer testing...i'd slap on my stock injectors, 3" cat, stock exhaust and use my EMS to tune a/f to pass the sniffer.
shietz...if MN ever got back into doing the sniffer testing...i'd slap on my stock injectors, 3" cat, stock exhaust and use my EMS to tune a/f to pass the sniffer.
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From: 648 at 8,500
Re: (adictionbass)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by adictionbass »</TD></TR><TR><TD CLASS="quote">This might be off topic, but are there any guys running 400+ whp that can pass a sniffer test?</TD></TR></TABLE>
I will let you know. I am going to try tomorrow morning. All 55 inches of my exhaust. I talked to a guy down at the emmisions place and told him about my car (my exhaust dumps right under the shifter) and he told me to bring a piece of flex to temporarily route the exhaust out the side of my car so they could get the sniffer in it. I also told them I didn't want anyone driving my car on the rollers due to the Tilton twin disk. He told me just to tell the tester and they will test my car without the rollers, this should help emissions a bit seeing as no load will be on the engine.
-Ryan
I will let you know. I am going to try tomorrow morning. All 55 inches of my exhaust. I talked to a guy down at the emmisions place and told him about my car (my exhaust dumps right under the shifter) and he told me to bring a piece of flex to temporarily route the exhaust out the side of my car so they could get the sniffer in it. I also told them I didn't want anyone driving my car on the rollers due to the Tilton twin disk. He told me just to tell the tester and they will test my car without the rollers, this should help emissions a bit seeing as no load will be on the engine.
-Ryan
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