First mod so far

Just bought a G35 1/2" Iso Thermal plenum spacer from Motordyne. Im hoping someone point in the right direction when it come to a aftermarket plenum that can fit the stock manifold with the added 1/2" spacer.

06 g35 5AT

 

The Plenum spacer fits the stock plenum. If you get another plenum you most likely will not want to run the spacer any more.

 

But would it not add more air into the system if you run a spacer an a aftermarket plenum together?

 

You would most likely lose HP and low end torque with an aftermarket plenum. You have a NON-REVUP 5AT and a plenum couldn't do much for you stock. Just install the spacer and reap the benefits.

 

Bro I don't want to lose hp. That's the whole reason I'm ask other G35 owners

 

So is the MREV 2 Manifold Solely for the revup motors?

 

The MREV2 will make small gains with an Osiris tuneon a non-revup, but it's generally held that w/o a tune it's not worth the $$ for the little gains you'll see.

 

Motordynes spacer corrects Nissans design flaw in the OE plenum. After market manifolds don't have that issue. MREV2 manifolds are for Revup motors, not worth the cost of installing them in your '06 MT.
Gary

 

Originally Posted by Hogbone:
So is the MREV 2 Manifold Solely for the revup motors?
Motordynes spacer corrects Nissans design flaw in the OE plenum. After market manifolds don't have that issue. MREV2 manifolds are for Revup motors, not worth the cost of installing them in your '06 AT.
Gary

Corrected.

 

TL;dr : too much or lack of air pressure in exhaust and intake explained using thermodynamics.

If you haven't had an introduction to thermodynamics you may not understand that more does not always mean better.

Say you have a 1" diameter hose pushing out 5 psi of water from a source that puts out 10 psi of pressure. The cross sectional area of the hose is 3.14 in^2 in this case. This hose limits the capabilities of the system. If we double the diameter to 2", our area increases to 12.56in^2 (this is a massive unrealistic hose). Therefore the new hose could accept more water.

The area increased by four times the original amount, the back pressure does not increase by that at the source. The max pressure water can be pushed from the source is 10 psi. You will have an area of the hose that is empty of water and therefore results in a further pressure drop at the exit. This is the equivalent of air in an engine where you have too much room for air to linger instead of rushing through your intake system and exiting through the exhaust.

In YOUR case, Nissan must have had an intern on the design team of the plenum intake. The VQ like every engine has an amount of air that is perfect for the design and unfortunately the stock motors come with a less than ideal design. Adding a little more room for air to flow into the plenum (flow through the airbox is already great) with the spacer upgrade gets you to that perfect volumetric flow that you need. This is the ideal hose for your cars system if you get what I am saying.

Hope that helps,

PS, iSO thermal gasket spacer is a must to cool air flow into engine.... How does it work? Ask Tony from Motordyne or PM Me haha.

 

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