4 port vs 8 port

Phinx · Post by **Phinx** » Wed Jan 23, 2008 2:22 pm

So Draco...

You whipped my ass in that drag race with only 4 intake ports?
I feel ashamed, I lost to a 12 valve

Gary57 · Post by **Gary57** » Wed Jan 23, 2008 2:35 pm

Well please post your findings, it should be really interesting.

Did you feel any difference when you fitted the 8 port over the 4 port??

Draco · Post by **Draco** » Wed Jan 23, 2008 2:52 pm

I did some fast research, the S13 comes with a 8 port 4 butterfly system where the S12 has the 8 port 8 butterfly system.....in the 8 port 4 butterfly system the 4 ports open gradually as the boost gets more....open throttle....8 open ports.....if it is disconnected the 4 butterflies stays closed....only 4 ports are open....

So this should make a diiferance....in theory....

Gary57 · Post by **Gary57** » Wed Jan 23, 2008 2:54 pm

Go connect it up, check if the actuator is still working and see the difference.

Draco · Post by **Draco** » Wed Jan 23, 2008 3:07 pm

I did but could not drive with it yet....I can see the butterflies opening as soon as I rev the car.....

The problem I have now is that the car was on the dyna without the butterflies activated.....this means the air/fuel ratio will be different as would the map......it seems I need to shit some money for the dyna again....

Gary57 · Post by **Gary57** » Wed Jan 23, 2008 3:14 pm

It shouldnt really be that far out because you will be flowing more air now and the unichip should pick that up and adjust the fueling accordingly.

Daniel · Post by **Daniel** » Wed Jan 23, 2008 3:48 pm

Gary57 wrote:If you had them completely disconected but the butterflies were open then you should of been fine.

Gary is right here. if they are disconnected they remain open.

I went and removed the butterflies in my intake all together.

i should have taken pics of it before and shown you how much gunk there was in those ports with the butterflies

Draco · Post by **Draco** » Wed Jan 23, 2008 3:49 pm

Phinx wrote:So Draco...

You whipped my ass in that drag race with only 4 intake ports?
I feel ashamed, I lost to a 12 valve

If I remember correctly you whipped my ass......but to put your thaughts to rest....it was connected but wrongly....thats why the car nose dived when I changed and took a while to pull again....remember the jurking and stuff....in the end it did not matter....you wipped my ass with that race. In anyway, the stuff you did now far overpowers my cabby...so don't worry...

Draco · Post by **Draco** » Wed Jan 23, 2008 3:53 pm

Daniel according to my research it stays closed......if I look at my plenum from the top you can see the arm that controls the butterflies...and some sort of setting screw....it stays in one possition when the car is idling or off...as soon as I rev the car the arm turns opening it....

Gary57 · Post by **Gary57** » Wed Jan 23, 2008 3:54 pm

Did any of you guys put the 8 port head on your car?? I want to know did any of you feel a difference over the 4 port head??

Is there a difference in the head or does the lower intake just change??

Draco · Post by **Draco** » Wed Jan 23, 2008 3:55 pm

Can you write a small "how to" to remove the butterflies totally?

Gary57 · Post by **Gary57** » Wed Jan 23, 2008 4:00 pm

I think those butterflies would come in handy if you had a moer of a big turbo, it would seriously help with the lag in the vacuum stage.

Daniel · Post by **Daniel** » Wed Jan 23, 2008 4:23 pm

Draco wrote:Daniel according to my research it stays closed......if I look at my plenum from the top you can see the arm that controls the butterflies...and some sort of setting screw....it stays in one possition when the car is idling or off...as soon as I rev the car the arm turns opening it....

Thats where you are wrong. the are open as standard i can assure you, i have taken my intake manifold off specifically to see what they are doing. if, as you say, they are moving when you rev one can only assume that they are then closing.

Gary57 · Post by **Gary57** » Wed Jan 23, 2008 4:26 pm

I would amagine they are closed when under vacuum and as boost increases they open to allow more air through. This way they speed up air flow when the air is slow (vacuum).

Daniel · Post by **Daniel** » Wed Jan 23, 2008 4:27 pm

Draco wrote:Can you write a small "how to" to remove the butterflies totally?

I wouldnt say its worth the hassel unless the engine is out/head off.

small how to:

-strip plenum thingy to bits
-forcebly remove butterflies and rod thingamajig
-seal holes
-re-assemble alles
___________________________-

doesnt get much smaller than that