Ok I am sorry, I am searching and getting confused by some contradicting threads on here (someone needs to make a sticky on plenums,manifolds,spacers)

The upper plennum is the visible plenum on top of the engine bay correct?

Where is the lower plenum?

And will the upper plenum do anything for 05 35anth or 06+ 350z seeing how they have the revised engine ?

 

The upper plenum is the one you see when you open your hood, you cannot see the lower plenum without taking off the upper plenum, the lower plenum is right below the upper plenum. Yes, a upper plenum mod will show gains on a Rev Up motor, I have seen people with the the Rev Up motor make 10RWHP with just the Crawford plenum. Be sure to check back for updates, there will be a post regarding plenum mods specifically for the Rev Up motor by Performance Nissan.

 

with the 06's its not neccessary to buy these because they come with revised plenum correct?

 

bump

 

upper plenum sits on lower plenum. spacer goes btwn upper and lower plenums.

 

What kind of plenum mods are we talking about here?

The plenum spacer does not work with the REV-UP engine but the Crawford Plenum does. How is this so?

 

The 06's have a revised LOWER plenum. The upper plenum is still the same. Yes the 5/16 plenum spacer does nothing for the Rev Up motor but I believe Crawford plenum is higher than 5/16 of an inch giving more volume.

 

so i only benefit from the upper plenum

thanks

 

https://my350z.com/forum/intake-exhaust/149776-the-truth-about-motordynes-new-mod-for-the-rev-up-motor.html