Extractors!!!??

[JDM-086]

I have been searching/reading high and low and it seems i can't find a definite answer ( possibly no definite answer for my question but well give it a crack )
apologies if this has been covered.


I'm in the market for extractors and i am completely stumped on what design to go for. i read mixed info in regards to 4-2-1 VS 4-1... so which should i opt for? what pros and cons does each design provide? what other factors should i be looking at whether purchasing extractors?

now the motor is a 4AGE 16V, whilst stock atm i will be purchasing the extractors to suit future modifications (these may obviously change, but this will be a rough guide )

plans are as follows

bigport head with ports cleaned out and shaved
smallport bottom end with new bearings and seals
WISECO 81.50mm or 82mm hi comp pistons
standard rods and crank
0.8mm head gasket
toda 288 or 272 degree cams 8.5mm lift
toda valve springs
adj cam gears
haltech ECU
20V ITB's

the car will be track/street driven.


here are some examples that i am looking at. my budget is about $500-700


POWER CRAFT


ANOTHER SET OF POWER CRAFT



REINHARD


5ZIGEN


NO IDEA. YAHOO JP SPECIAL?


NO IDEA... ANOTHER YAHOO JP SPECIAL ?



RUN FREE

[Sprinter86]

[McLEVIN]

4-2-1 would be for mild tuned 4age
4-1 is generally for racing...but your plans seem that engine could benefit 4-1

2nd your not gonna get powercraft headers for $800

Another option you could save a bit more and take your engine to an exhaust shop and get a full custom system

[twincam16seca]

Hi all, yes I'm new to the site but have been on Rollaclub for a while!
This is what i have been told by a well educated and experienced corolla guy from back in the day, he told me 4-2-1 will help with lower end torque and the 4-1 will give better breathing up top end, so it depends what your doing, and by the sounds of it the power will be up top with the high comp pistons and cams.
Hope this helped a bit.

[JDM-086]

McLevin:
the ones i posted are in my price range, apart from the 5zigen and the reinhard which are slightly more.
i considered going to an exhaust place but i haven't really found a place i trust and all the places i have spoken to, tend to put this in the "too hard" basket.
Ok so your suggestion would be with the 4-1. which means the run free or the powercraft
question:
the reinhards are 4-2-1 but the secondaries are very short. any idea on this design type?

Sprinter86:
they seem nice and very well priced. what made you land on those? i dont know if i read correctly but are they based off a TRD design? also they are 312 stainless steel, is this a concern?

[JDM-086]

yeah thats generally what i've gathered from a lot of what i've read but there has also been debate (especially recently) that its not correct, due to a lot of technical factors which are far beyond my understanding lol.

[Sam-Q]

According to Toda their 4-1 design gains 3% in the top end but loses out on a huge 15% in the mid over their 4-2-1. With that in mind even a track car shouldn't fit 4-1 pipes. I know someone that went from fairly well made 4-1s to 4-2-1s and he picked up lots of mid range power. The pipes whern't even that good, the primary lengths where way too short.

Interestingly enough on the earlier 3sge engines 4-2-1s make more top end power than 4-1s. Goes to show people shouldn't make assumptions. It's just like inlets lengths- unlike the theory a shorter velocity stack on a 4age hurts top end power.

[JDM-086]

so whats your pick of the bunch sam?

im kind of leaning towards the reinhards, they seem like a nice design with good bends in it. and given the short length of the secondaries, seems like its somewhere between 4-1 and 4-2-1... but in all honesty if i knew what i was talking about entirely i wouldnt be here asking

[Sam-Q]

the first Yahoo JP special, decent length primary and secondary pipes

[Willofan]

I run my AE86 Group A race car with standard exhaust manifold, yes the cast iron one deburred and port matched. It produces 180hp and revs to 9,200 with 11.1:1 pistons and 320In/304Ex cams on a TRD ecu and standard inlet manifold.
Why do I use standard, cause the rules of historics say I must. I have been told by the experts, that fitting extractors would not make any more power/torque in my set up.