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Location:
S.E suberbs, Vic
Registered:
December 2003
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4age (4 to 1) Vs (4 to 2 to 1) extractors
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Wed, 15 June 2005 07:13
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I am sure this has been covered many times before but I can't find it anywhere. I would like to know if anyone has any dyno or seat of the pants comparasins between these 2? or any general thoughts?
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Location:
Canberra
Registered:
April 2003
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Wed, 15 June 2005 07:35
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^^^Also would like to know this. have only heard that 4-1 are better for top end, while 4-2-1 are better for midrange.
Does anyone also know the difference the lengths make? I have 2 sest of 4-2-1 extractors and one has equal length primaries and secondaries, while the second one has much longer secondaries. I haven't had the chance to put these next to each other on a dyno yet, but would would be the difference?
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Registered:
November 2002
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Wed, 15 June 2005 11:22
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I tried both types on my old 2TG years ago. The 4-1 was a bit better in teh top end but the 4-2-1 is definately better in the mid range. Not sure how much, maybe 10% or so.
The 4-2-1 also made the engine sounds quieter in teh lower range.
If I did it again I'd go for the 4-2-1. Thats if I didn't have a 3T GTE.....
Cya,
Simon
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Location:
Adelaide
Registered:
August 2003
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Thu, 16 June 2005 12:03
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Purely opinion, but I think 4-2-1's sound nicer than 4-1's.
I have a set fitted on my AE86 and the secondaries go a long way under the car. Sounds so much less ricey than the 4-1s on it before..
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Location:
Melbourne
Registered:
October 2004
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Fri, 17 June 2005 01:23
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can anyone tell me suitable length and diameter of the secondaries coming from stock manifold? My engine came with really short secondaries. My exhaust shop is going to make and install whatever I want for $150.
Or should I get them to make an entire new set of extractors... i'm not sure if trust them with that much pipe...
cheers
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Location:
Melbourne
Registered:
October 2004
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Fri, 17 June 2005 07:39
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| shinybluesteel wrote on Fri, 17 June 2005 15:11 |
or you could just look at mine you goon.
150 bucks is pretty expensive for that job, we can get the pipes press bent at midas then fire up the mig and burn holes in them, then take your car to an exhaust shop and have them do it.
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If I pay someone $150 to make and install the pipes, at least i'll have someone to blame when the clutch cable melts 
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Mon, 20 June 2005 13:21
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Skaney: could you feel a difference between the two of them when you swapped?
oldcorollas: nice system you have there, apart from some spots where it may have a step on the inside its a fairly well shaped exhaust.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Tue, 21 June 2005 01:42
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yeah, the collectors were a bit of a bitch.. the pipe does not stick into the collector much, so there is buggerall lip in the direction of gas flow...
only took me a day of stufffing around to do it, and most of that was trying to work out how to get around the starter motor with 37mm pipe...
total cost.. under $200 (+welding time)
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Location:
Adelaide
Registered:
August 2003
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Re: 4age (4 to 1) Vs (4 to 2 to 1) extractors
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Tue, 21 June 2005 07:49
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I could actually feel a difference.
Although this might of also been because the pipe that joined the headers to the cat on the previous exhaust(4-1) was quite restricted and not very well put together.
Not long after fitting the 4-2-1's I had the head ported the bigport 4AGE had alot of midrange power compared to other stockish 4AG's with 4-1's.
Since then the motor has had a bit of work, being mainly setup for midrange and nice power curve rather than peak power so its probably better with the 4-2-1s.
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