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Location:
Sydney
Registered:
June 2003
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Location:
Tasmania
Registered:
May 2002
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Re: 20v exhaust
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Sun, 22 May 2005 02:18
 
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For a road going car, 2" would normaly be loud enough. Many with the 4A-G go to 2.25", which would sometimes sound good, and other times sound like a bee in a box, depending on mufflers. I am guessing 2.5" is a little extream, and loud. And loud will not always sound good if you have the wrong mufflers (cannons). I am planning a 2.25" system with mine, with resonator and muffler. I have 2" on my 3T-G and that is plenty loud enough, and sounds good.
Exhaust will not really help your car fun better (unless it is currently really really small). If it backfires it is probably running too rich. Or you can get bad backfire sounds if you have no exhaust, or the exhaust is too big with no resonator.
Some people put a rev limit of 9000rpm on the 20 valve. The stock 20v tacho goes to 9. But the stock rev limit is probably at 8200rpm. Some say that if you continuely run any stock 4A-G to 8500rpm you will do a big end or put a rod out the side. So if you want your engine to go a long time don't go over 8000rpm. If you know the tune is wrong, don't go over 6000rpm. If the tune is wrong, it will be very hard to get past 7500rpm anyway.
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Location:
Sydney
Registered:
June 2003
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Re: 20v exhaust
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Sun, 22 May 2005 08:16
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thank for the reply
I also think that i have a leak on the exhaust aswell.
I'm runing qrad throtle with after market ecu.
what would be the cause of back fire on the last throtle closest to the fire wall?
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Location:
Somewhere on a dirt bowl ...
Registered:
August 2004
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Re: 20v exhaust
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Sun, 22 May 2005 10:26
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It could possibly be an air leak between the exhaust manifold and the head or like jonny said too much fuel (like a leaking injector).
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Location:
S.E suberbs, Vic
Registered:
December 2003
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Re: 20v exhaust
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Sun, 22 May 2005 12:51
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we had a pretty good thread while back when it came to a 4age setup, try finding that with a search, should help you.
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Location:
Tasmania
Registered:
May 2002
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Re: 20v exhaust
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Sun, 22 May 2005 14:36
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if it backfires back out through the inlet manifold, you have a air leak at the inlet manifold on that cylinder.
My sidedraft carbies used to do this, throwing a ball of flames out the trumpet.
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Location:
Sydney, OZ
Registered:
May 2002
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Re: 20v exhaust
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Mon, 23 May 2005 09:55
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Just a little info, standard 20V exhaust system is around 2"-2.25", I haven't measured the one sitting in the workshop, but sitting next to a standard AE102, it's definately a big sucker!
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Location:
Brisbane
Registered:
October 2004
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Re: 20v exhaust
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Wed, 25 May 2005 07:03
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Anyone know what the standard exhaust pipe size is on the AE90 (6AFC)?
Now that I have the 20 Valve in, i was going to put a 2 or 2.25 in but just wanted to know what I have in there atm...
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Location:
Sydney
Registered:
June 2003
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Re: 20v exhaust
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Wed, 25 May 2005 12:29
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if it backfires back out through the inlet manifold, you have a air leak at the inlet manifold on that cylinder.
My sidedraft carbies used to do this, throwing a ball of flames out the trumpet.
where is the inlet manifold?
as far as i know the quad is my inlet mainfold.
there is not fire when I said it back fire. but it blow our a high presure air.
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Location:
Parra
Registered:
January 2005
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Re: 20v exhaust
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Wed, 25 May 2005 13:22
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does the exhaust actually matter? im going for 2 1/4 on my 4age and my mate said the larger the better , and saying like you cant get TOO big etc etc
but the right size exhaust for that engine , i .e a 1.6L shouldnt be to large yeh?
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Location:
Hong Kong
Registered:
November 2003
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Re: 20v exhaust
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Thu, 26 May 2005 02:29
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Hi guys
I offer my mods for discussion.
http://www.my-acoustic.com/Car/intake_exhaust/cust om_extractor/custom_extractor.htm
http://www.my-acoustic.com/Car/intake_exhaust/muff lers/mufflers.htm
I think it should not be more than 2 inches because of observation of: -
1) jet fighter - they are fastest when the last section / exhaust flare closes / become smaller
Right?
2) Ferrari, Lamborghini, and those 450bhp sports car class normally have twin pipes and each are no bigger than 2 inches.
I never measured them before but watching from videos, it's around 2 inches and no more than 2.5 inches for sure.
Regardless of V8, V10, V12 versus / compared to our 4_in_line / versus turbos and what lot .... BHP = BHP = total flow and is a 450bhp to massive 600bhp+ can sustain using twin 2 inches pipes then single 2 inches pipe would be more than enough for us.
Current WRX, EVO comes stock 280bhp single 2 inch pipe. In fact my friend's WRX 5 years old, runs 1.7 inches stock. All he does is remove the CAT. I know I know it's not environmental friendly. Well he removed 2 out of 3 and retain the last one only.
On dyno he recovered around 30 bhp be removing the front 2 cats.
My current setup runs bad at low rev / low throttle when I swap in the MATOLA straight flow.
I kinda regret using such big pipes 
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