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Location:
Newcastle
Registered:
May 2002
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AE86 Exhaust
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Thu, 11 December 2003 23:43
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I am looking to fit an exhaust system to my 4AC AE86 (ok, everyone can stop laughing now). I have read advice on these pages about diameter, extractors, resonators, etc. I have decided on the following setup:
2.5" press bent, 2 resonators and a canon tip. No extractors.
However, when I went to talk to the guy at the exhaust shop, he started on about how 2.5" will make the car lose power, and he also recommended extractors. What I'd like to know is your opinions, as you guys actually drive 86's and I know alot of you have good mechanical experience. Another question is to go over or under the diff? Who has done what? I have lowered the car 2", and the guy reckons there's no way that I should go under.
I have plans to get a better engine, I am really just playing around at the moment and not spending too much money. I have already got rid of the standard filter, and done the other small things that were recommended in other threads.
Let me know what you guys think, and what you have done. Thanks.
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Location:
Ipswich
Registered:
May 2002
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Re: AE86 Exhaust
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Fri, 12 December 2003 00:16
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I don't have an 86, or even an A motor yet, but from what I've read and heard of a 4AGE (which I would assume would have about the same exhaust gasses as a 4AC) a 2.5" system would probably be a little big. Most people seem to recommend 2.25" press bent or 2" mandrel, and again a lot of people think the factory headers (for 4AGE) are very good and will be adequate for most applications. However the 4AC headers will be different, no idea how good or bad they are.
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Location:
NSW, East Coast
Registered:
July 2003
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Re: AE86 Exhaust
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Fri, 12 December 2003 00:43
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This was disgussed a little while and while im not sure of the termanology i hope you understand.
"4ac with exhaust wont make any more power because of the non crossflow head design, you'll only get a better sound."
Just what ive heard i hope its true.
Good luck
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: AE86 Exhaust
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Fri, 12 December 2003 01:44
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Jeez, what is it with AE86 exhausts at the moment, everone's got a thread on it?!!!
Personally I feel your intended system will be a waste of mone (ie, will cost twice as much). I think it will be to big in pipe size to effectively muffle the 1600cc, resulting in all the extra resonators.
As I've mentioned in other threads, a 2" system with good single muffler at the rear is all you need both for performance and sound. This is the setup I copied when making my system (yes, that I still now want to sell!). I definately recommend going over the diff, as I have done, it protects the pipework, making it last longer.
I think extractors for a 4AC would be money well wasted, instead look around for a 3A interference style exhaust manifold - these are different to the 4A four into one manifolds and flow better. This is also the style of manifold I used on my 4AC, and was happy both with the power and noise of the exhaust. On a side note, the factory 4AGE cast exhaust manifold are also interference style design, so look to replicate that, as they work very effectively.
Once you do upgrade your motor, the system is still good enough for any NA 4AGE, you'll just need to modify the front of the pipe to pick up on the LHS of the car compared to the RHS for your current engine, making it a cost effective setup to use.
Clint
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Location:
Brisvegas
Registered:
June 2003
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Re: AE86 Exhaust
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Fri, 12 December 2003 06:06
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if you're looking at doing an engine conversion in the near future you'd obviously want to ensure the exhaust system compliments the new engine...figure out what you want to do in that dept 1st.
as clg stated 2" is good for 4ac,4age...if your throwing in something with significantly more power...anything up to 2.5 is good...depends on what you do
what engine/s are you thinking of?
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Location:
cambo
Registered:
May 2002
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Re: AE86 Exhaust
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Fri, 12 December 2003 07:50
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a 2.5 inch exhaust is too big for a 4age let alone a 4ac. and whats the point of having a 2.5 inch system with 2 inch resonator? why get an exhaust now if your gonna upgrade engine later? its a waste of money cause you will get jack-all power. for the extra 5KW (if your lucky) you could have spent the money on something worth while. if you want your car to be loud (which is the only reason i can see youd want to bother with an exhaust on a 4ac) then just rip out the back muffler or something.
my opinion anyway.
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