AE86/4AGE headers guide......

[oldeskewltoy]

Sorry 'bout the tease... but in essence I need your help!

As far as I can tell there is no collected information on AE86 exhaust headers. There are a few recent threads..... MANY older ones... and it has become obvious that a "write-up" is needed.

There is NOTHING like expereince.... SO... what I'd like from members here is... Tell me about YOUR AE86 header! I have an example of the format I'm looking for.....



Manufacturer - KBD or Dobi(originally KBD was known as Dobi back in the 80s)

4/2/1 type

Primaries - 38mm(1.5") x 406mm(16")
Secondaries - 45mm(1.8") x 406mm(16")
Collector - 66mm(2.6") x 102mm(4")
Adapter - 66mm-52mm x 255mm(10") the "stock" adapter allows the header to bolt to the stock cat... OR a custom adapter can be fitted if you choose to run 2.5" exhaust

(self measured) - other option here would be manufacturer specification


installation/fitment - pretty easy taking about 2 hours total. All bolt holes fit, EGR fit without bending. Fitment to the car is excellent, it doesn't touch or bang on any part of the car. It doesn't come close to the brake master cylinder. It fits LHD with NO modifications. This header has no mounting points for the factory heat shield, so some other shielding is required.

Feel - this section is purely opinion... but besides power(real or imagined) please post noticeable differences. In the KBD's case, there is a very noticeable smoothness this header adds to the 4AGE charachteristics. I have no pre header dyno, so I can't compare actual performance gain/loss.

No longer available.

I'm trying to compile as complete a list(both past and present) as possible. This is so the information is available as well as hopefully aiding in ID-ing an old header.

[Sam_Q]

Brand: my own

Primaries: 38mm (1.5inch) x 500mm
secondaries: 51mm (2 inch) x 250mm

but I plan on ditching these as I want something even better in due time. I think you will find almost all 4-2-1 pipes off the shelf are far from ideal

Heres some pics of my dodgy work and I will have some good links for you shortly

[The Witzl]

BRAND: Anthony Kellam brand, 4-1 mandrel bent jobbies.

Diameters - no freaken idea.

Performance - loud and buzzy. Were a lot better above 4000rpm than the factory headers, the engine sounded a lot more free to rev.

[thanhngo]

Brand: RSR 4-1

Dimensions: will measure next time I have them off

Performance: Less bottom end than factory

[oldeskewltoy]

Hmmmmmmm I've resurrected this thread.......... CMON people... there must be some 4AGE/rwd header info in this group... there are enough 4AGE powered cars here........

In an effort to jump start this, I've gone on a quest to find 4AGE/rwd headers. some are rhd, some lhd.




JSP header custom ...





Silkroad USA


Silkroad Japan


Martelius


TRD race type


Toda one piece


Vibrant


shirizueki - custom

[oldeskewltoy]

RS*R


APEXi - early, or 1st gen


TRD - early, or 1st gen


KBD

PLEASE add what you have/know about!!!

[thanhngo]

Powercraft N2 4-2-1 design (they also have 4-1 versions which is similar to shirizueki one above.

Yet to test them...maybe in 6 months. But no point until i pop the 288's in as well.


Collector

[RobertoX]

Any detailed pics of the factory ones? (I wish I took some when I had them )
Where is the best place to put the oxy sensor? With most you have the option of placing it close to the exhaust port or further away in the collector. (where is it on the factory one? Also which cylinder[s] is it reading off?)

[Panda_Tureno86]

Hi, I have driven ae86 with RSR, Fujitsubo and TODA
But they all have different engines and exhaust system.
one of them even without a cat.
so I guess it all depends what you are planning to do with your engine.
PM me some questions, see if I can help mate.

[oldeskewltoy]

Hmmmmmmmmm

Ok... here is what I'm after....... a 4 into 1 stepped header that fits LHD. Flange and first stage primaries to be 35mm, these first primaries are to be 100mm long(4"), they should then expand into 38mm primaries that reach back 24" further, making a total length of 28". The collector should be well blended, and measure 51mm. Additionally, the header should be made from mild steel, and it should have a flex joint close to the cat/exhaust flange.