I just noticed they have different intake manifolds. If youve taken off your vq35 intake manifolds off before, youll know there are "power valve" butterflies (6 of them) in a row right under the UPPER intake manifold, but also if you take off the upper and middle intake manifold, there is a bottom manifold. Well that bottom manifold is different on my JDM engine compared to my factory USA engine.
The old engine has butterflies built into the lowest intake manifold aswell, and a "plunger" on the front of the manifold that ties into those butterflies and must open them based on vacuum?? Well the JDM manifold has no butterflies and no plunger. Heres a pic of the plunger and you can see the butterflies. The vacuum line you see connects to the picture below this (red line)
Right now I have the jdm version still bolted to the engine, I am hoping I can use it and it wont make any difference, really would just like to know it isnt going to cause any driveability issues. The only issue I see is the vacuum source that ran from the "plunger" that tied all the bottom butterflies, the vacuum line runs to the back of the "black box". Would I just cap that line. This pic shows where the vac line would come from the bottom manifold, and plug into the back of the unit.
Do you guys think it would be any problem using the version without the bottom butterflies? im not quite sure why they are needed
im curious if the car will even know the butterflies arent there
