Unique Fiero 2.8 iron exh...

[neo71665]

I think I like the sound of my long tubes and flow 40

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[Superdave]

an X pipe on a '660 is also a huge improvement, even though the pulses are balanced it still increases the scavenging and cleans up the exhaust note.. probably better than it does on a V8. I wish i had taken some videos of my Z24 after i put the latest X pipe on it.


Now if we only knew someone with an engine dyno we could test shorties vs longtubes vs 180's...

[ForcedFirebird]

makes sense.... if only you had the ability to cast cranks john...

but i guess connecting the correct sets of cylinders together would work, as long as you want to deal with the more complex exhaust plumbing.

it does sound similar in conecpt to Tri-Ys.... but with 2 less cylinders, and i know those headers make some hellacious midrange power.

But it IS tri-y's 6 primaries, paired to 360* of crank rotation, to one 3-1 collector. Only other way to get the same scavenging effect is to do a 6-1 collector. Search 6-1 headers and tell me what you think of them

I think I like the sound of my long tubes and flow 40

Still have rasp on decel/rev-down.

an X pipe on a '660 is also a huge improvement, even though the pulses are balanced it still increases the scavenging and cleans up the exhaust note.. probably better than it does on a V8. I wish i had taken some videos of my Z24 after i put the latest X pipe on it.


Now if we only knew someone with an engine dyno we could test shorties vs longtubes vs 180's...

Dynoes to back theories and prototypes is a must. Tru duals sound so nice on an even-fire v6 because of the way the primaries will "twist" the pulses to create a "toilet bowl" effect in scavenging. The x-pipe will increase performance and sound because the secondaries are joined so late in the exit.

OOPS! I realized when I said "first video" that the 6-3-1 video was never posted because the videographer wanted secrecy.

[robertisaar]

LOL, with a V8, i guess there's actually 6 Y's but i see the point.

i see 6-1 headers for straight 6 motors.... and they look fairly straightfoward.

i'm interested in results here.

i have a hard time seeing all of this fitting nicely in a FWD application though... but i imagine it is possible with enough tweaking and prototyping.

[robertisaar]

so i was thinking about it a bit more....

combine 1-4, 2-5 and 3-6 cylinders together for this 180* effect? then to a 3-1 collector? damn these are gonna be complicated...

[Superdave]

so i was thinking about it a bit more....

combine 1-4, 2-5 and 3-6 cylinders together for this 180* effect? then to a 3-1 collector? damn these are gonna be complicated...

Yep, that's the idea.

[Jonpro03]

[robertisaar]

LOL, that is exhaust hell.

[Driver_10]

Lol. Blades come in for the new band saw tomorrow, trust me the itch is killing me.

Well, these headers I am talking is a 6-3-1 system, like the first video. What the intended purpose is to pair two cyls at TDC to help evacuate the opposing cylinder, thus creating the sound of three flat planes on a crank.

Hey john, correct me if Im wrong, but that would mean pairing 6-1, 2-5, and 3-4, (I hope that I got that right) Wouldnt that require 3 separate 2-1 collectors?

[Driver_10]

Whoops... I guess I got my cylinder pairing wrong. I kinda drew a similar picture on a sheet of paper while reading.

That would sound sexy as hell.