Hey,
It's been a good long while since I installed the plenum spacer so I can't remember what's up with this copper tube. Noticed it going nowhere when replacing spark plugs and now I'm curious if something happened to a hose or something.



Right under the throttle body.

Sup with it?
Please and thank you.

It is one of the coolant hoses that goes to the throttle body.

^^^^^ this. How long you had that dis connected haha.

That's a motordyne part, you don't need it connected unless the temps get below 50 degrees F. Otherwise it will just rob you of power.


http://www.motordyneengineering.com/...e3ea6e12db3255

It's been disconnected forever I assume. I don't remember ever putting anything onto it. I live in WA State so getting below 50°F is pretty normal except for summers. Regardless, I haven't really noticed performance changes throughout the years... Should I get it connected? Where exactly is it suppose to run to?

idk that md part would be facing downwards no? not forward like the pic op posted

Maybe someone made their own. The OEM model has one and at temps below 50 there is a possibility that icing can take place in the Throttle body. So, yeah, hook it up.

Bought this set brand new. I know what I have is legit. I forgot to mention that there is another copper tube that does aim downwards and is also not connected to anything, but I couldn't get a proper picture of it. I've been through two winters without it hooked up
So I have to get some rubber tubing and do this custom?

after googling looks like the 2007 350z tb has that copper tube. i guess from hr motor? the de engine has it but its on the plenum.

or nm heres a better pic. shows both tubes. i guess this replaced their valve version. md site will show how it should be connected op

Thanks; I'll check it out.

There are two hoses going to your upper plenum, you can see one just below that copper tube. You're supposed to disconnect from the plenum, and connect to the Motordyne copper pipe. Right now you have coolant warming up your upper plenum and that copper piece is designed to ONLY warm up the throttle body. Basically you're not getting the full benefits of the ISO thermal portion of the spacer.

Hey me and my buddy recently just installed our 5/16" copper iso thermal plenum spacers and I hooked up the hoses to the copper piece but I believe there should also be a valve that turns on and off the coolant flow to the throttle body?

Anyway the reason I ask is because our kit didn't come with one and I just emailed ConceptZ.

Yes there should be a valve.

No, the copper piece replaces the valve. it's a set and forget piece vs the valve that has to be opened/ closed.