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Old 10-25-2003, 03:24 PM   #1
Julio
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Member#: 6363
Join Date: May 2001
Location: Gossip Island
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10 Sec. Club
Element - Crawford

Default Intake manifold with larger plenum?

Anyone knows if there is any difference in plenum size between US WRX, JDM WRX, JDM STI, Type RA and Type RA Spec C?

I am looking for an intake manifold with the largest plenum available.

Will appreciate any help.
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Old 10-29-2003, 02:25 PM   #2
Section 8
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Chapter/Region: MWSOC
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Default

Whats your thinking behind a larger plenum? I want the smallest one due to off throttle response. A larger volume will take longer to "empty" between shifts keeping your rpms higher thus beating on your transmission between shifts. Even with 9.5 opund flywheel, my 2.5 (still NA) takes a little less than a second to loose RPM if I hold a steady 3-4000 RPM in neutral and let off the accelerator.

While you may have a larger volume that keeps its pressure longer between shifts, it also takes longer to pressurize, so the gain is a wash.

Depending which heads you have, the RS manifold will have the largest plenum, but may not fit the heads. Newer RS heads and US WRX heads (probably new body style rest of the world WRX as well) will interchange manifolds. 98 RS and older JDM/EURO/Aussi WRX/STi (old body style cars) will swap over too.

Greg
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Old 10-29-2003, 02:50 PM   #3
Julio
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Element - Crawford

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