is there any diffrence in either the z6 or y8 intake manifold? which has a better flow?

 

The y8 is widely considered to be the better intake manifold.

 

p2p = y8
p28 = z6

schardbody: p2p manifold causes lean conditions in cylinders 2-3
schardbody: so its not good for N/A
schardbody: but in a forced induction scenario its better, cuz the boost evens out the airflow to each cylinder
schardbody: and the larger cross section adds more top end power
schardbody: in boost power i guess you would say
bense: how does boost even out the airflow?
schardbody: its forced
schardbody: if its forced into each cylinder until its PACKED full
schardbody: its not just being drawn in
bense: oooh
schardbody: this is all according the JD
bense: hmm
schardbody: p28 is better for low end tq and throttle response
schardbody: i think if port matched it would outperform
schardbody: but the P2P looks better to me

 

Interesting

 

so the y8 is better for boost and the z6 is better for N/A?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2oh6civic &raquo;</TD></TR><TR><TD CLASS="quote">so the y8 is better for boost and the z6 is better for N/A?</TD></TR></TABLE>

No, the truth is that it doesn't matter. The difference between the two is minimal, as proven by many tests buried deep within the archives.

Here are the basic facts. Take it however you want.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">
Z6
Total IM Volume 1900cc
Plenum Volume 800cc
Runner Volume 275cc
Runner length 12"


Y8
Total IM Volume 2450cc
Plenum Volume 1450cc
Cyl 1 and 4 Volume (longest runners) 275cc
Cyl 2 & 3 Volume (shortest runners) 240cc
Runner length 12"

</TD></TR></TABLE>

 

so which IM should i buy?

 

if it's a y7, i'd just get a y8 intake manifold.

if it's a d15b7, i'd just get a z6 intake manifold.

that way your fuel rail, etc all swap over.

unless you can find a complete z6 intake manifold for cheapo

 

I'm having the same, dilemma, putting a z6 in my ef....I've got both manifolds and want to have which ever is the best portmatched to my LS throttle body with a Hondata IM gasket......I've heard both ways, just not much backing either arguement up.....

 

go with the y8

 

go with the y8 manifold. if anyone wants one i've got a spare bare z6 manifold

 

y8

 

does anyone got a y8 IM forsale? hopefully with the injectors and fuel rail and TB