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after market vs standard extractors
Topic Started: Jul 2 2008, 06:36 AM (291 Views)
brentz-r
Stage 2
looking to buy some after market extractors anybody got and recommendations on brands and where to buy em etc or am i best to find something else to spend my money on . any tips on how they go against the standard ones? huge difference?
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AceSniper
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Global Moderator

not that much gain, can get good gains for cheap by re-making the 2-1 pipe then spending the rest else were
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BZ-G
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aka Hyper Rev 4...
well if you increase "huge" power from the engine then yeah the aftermarket extractors will help the flow of the exhaust and thus gain power...
but, if you only have stock engine and change the extractors then yes there will be gains but very little...
unless if you change the whole air filter intake and the whole exhaust system then there will be hp gains since more air into the engine and more air out the exhaust will gain hp....
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brentz-r
Stage 2
i got a cat-back system now if i add extractors and de-cat would i see a subtancial gain ?
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chiksluvit
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[OO\_____/OO]
in short
no
i've got hks racing headers a metal cat and full catback, and i can tell u the gain doesnt justify the amount of money spent
just redo the Y pipe, and it should be good
if you do get the extractors though, you'll be able to start maximise the benefit from those aftermarket extractors with bigger cams and ecu
again its all about balance
Edited by chiksluvit, Jul 2 2008, 08:16 AM.
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Wolftown
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Stage 5
Are you talking about butchering out the big flaps inside the 2-1 of the manifold? Was thinking of doing this a while back, much work involved??
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chiksluvit
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[OO\_____/OO]
actually i was referring to the pipe section where 2 goes into one... replace that ugly bit of kit
it was very badly manufactured and some gains can be had by replacing it with proper mandrel bent pipes
as for the tabs/flaps, they're located at the 2 end of the 4-2 section, i honestly dont think its that much of a big deal, taking it out or not won't really affect it much, i think
depending on how big the tabs/flaps are, if each of them fully isolates 2 cyls, then don't take it out, its there to aid smoother exhaust gas flow and reduce turbulance..
i do remember seeing it when i was changing the extractors, but didnt pay much attention since i was changing it to hks racing headers anyway

actually
while getting the 2-1 section remade, i'd also highly recommend heat wrapping the stock extractors, all the way from the 4-2-1 til the cat
i had that done before going hks racing headers, from my impression, i could feel the engine was a lot more responsive througout the revs, especially low- midrange
in case if anyone is concerned, heat wrap doesn't kill the extractors, my stock extractors were wrapped for about a year and it was still fine til the day i took it out, my current extractors have been wrapped since day one and it's also still ok, not a single crack
just don't paint the wrap, it makes the wrap brittle over time
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brentz-r
Stage 2
cool thanks that helps. but when you say get the 2-1 section remade what do you mean ?
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BZ-G
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aka Hyper Rev 4...
means that, making the pipe bit larger in size at the place where it kinda bends a bit near the end of the 2-1 piece, kinda near the sub frame area and the cat area, since that area of the pipe is kinda bit squashed in... cut that piece and reweld a nicer round pipe....

all in all, any exhaust or extractor will increase bit of power and response but as chiksluvit said, for what you pay on those parts, they don't produce a lot of hp gain for what you pay for them... our n/a engine needs a lot of money spent to make any huge power differences... but if you just continue to add and spend money on performance parts including engine internals then yes hp gains will slowly add up.... but money slowly gone...

this is the link regarding another member here removing those flaps in the 2-1 section...

http://s15.zetaboards.com/AE111_Forum/topic/132000/1/#new
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brentz-r
Stage 2
cool thanks be my weekend job :D
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BZ-G
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aka Hyper Rev 4...
i remember there was a post/topic around here which showed someone changing the 2-1 section of the pipe... i mean cutting the "squashed" pipe area and welding another piece together.. but can't find it and don't remember who did it... anyway know...??? :idk:
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chiksluvit
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hi guys
i originally posted this heatwrap information in another thread. for ease of search, and further the discussion, i'd just quote myself and double post it here.. since it's a bit off topic in the other thread.

in addition, i would actually recommend to just get that 2-1 section totally remade, with mandrel bend, also heatwrapped

Quote:
 
in terms of heatwrap, i do believe that it will help to get you some gain
i could feel the change when i wrapped it

how it works is like this..
the exhaust that comes out of the engine carries energy, kinetic energy and heat. heat escapes from the pipe, but if you wrap it, it minimises heat loss, and some heat stays and gets converted into kinetic energy. with more kinetic energy, exhaust flows (kinetic energy) at a faster rate, the vacume in the exhaust pulse will aid in extracting the burnt mixture from the combustion chamber when exhaust valve opens. with slightly more vacume, when the intake valve opens, it helps to bring a more fresh air in from the intake chamber.

added bonus is it decreases engine bay temperature. so all the rubber, paint on your bonnet, intake air, radiator, engine, are all in a slighly cooler condition.

also, reason for why a good set of extractor would help in this aspect is kinetic energy gets converted into heat at bends or bad/ rough surface, this is however pretty minor and i wouldnt worry so much about it with the 20v headers, except for the Y (2-1) section..
Edited by chiksluvit, Jul 3 2008, 05:03 PM.
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