i'm gonna be recieving a 70mm bbk tb and portmatched ported skunk2 im and i was wondering if this would do me any good or if it was just too big for my setup? i would try to get a header and tune on crome if i were to put it on.

gsr block (11:1 compression)
81.25mm usdm itr pistons
arp headstuds
stock gsr head
stock header
cheap intake
2.5'' piping from header back

 

you should do cams and a better header first

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by doood &raquo;</TD></TR><TR><TD CLASS="quote">you should do cams and a better header first</TD></TR></TABLE>
X2

 

This has been a long debated subject

Air volume v.s air speed

My recc. Are 1.8 liter 64-66mm

2.0liter 68mm
2.1-2.3 70mm

Just guidlines though
Camshaft profiles greatly affect air intake characteristics

 

would itr camshafts alter my air intake characteristics enough that the intake manifold and tb would be helpful?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shabam &raquo;</TD></TR><TR><TD CLASS="quote">would itr camshafts alter my air intake characteristics enough that the intake manifold and tb would be helpful?</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shabam &raquo;</TD></TR><TR><TD CLASS="quote">would itr camshafts alter my air intake characteristics enough that the intake manifold and tb would be helpful?</TD></TR></TABLE>

that tb is still too big. just use a stock itr 62mm tb.

 

but the intake manifold is port matched to 70mm. maybe i should get a tb that is 70mm but tapers to 68?

 

that is still too big for the amount of mods you have. bigger is not always better. just skip the manifold and tb until you get bigger cams and a better header.

 

pretty sure they don't make tb's with reverse taper.

 

put it on and dyno.

btw, these types of questions should usually come BEFORE you spend money on it.