I can't imagine that much heat is transferred from the plenum to the intake air moving so rapidly through it. So, other than whatever minimal power loss may occur from heating the throttle body and plenum, is there anything in the design of the 04 plenum that requires use of either the manually switchable valve in the Iso Thermal MREV or the throttle body heater in the Copper Iso Thermal MREV rather than just letting the coolant flow normally as in the factory configuration? It would certainly increase the stealth of the mod if the only readily observable evidence of its presence was the slightly increased height of the engine cover.

 

I am not positive as to the extent of the effect of the TB heater. Hopefully Tony or someone else in the know will chime in on that aspect. As far as stealth, here is a picture of the copper TB heater installed with the engine cover off. With the cover on, it is not visible at all.

 

so what about us with the 03' coupes? Which would be the best to install? For some reason, I don't get it.

 

The bulk of the MREV's power increase comes from the flow characteristics of an intake system designed to enhance mid-range torque at the expense of a little bit of power at the very top end of the rev range. The MREV is intended only for the revup engine in the 05 and later 6MT coupes because the heart of this mod is the lower plenum employed by the pre-05 non-revup engine. If you have a pre-05 G you already have this lower plenum -- thus it's pointless to swap one part for another that is identical -- and your options are limited to installing a plenum thermal isolator (spacer) and either the manually operated coolant shutoff valve or the copper throttle body heater/plenum coolant bypass. Your power increase will be limited to whatever you gain from the reduced plenum heat soak and resultant decreased transfer of heat to the intake air passing through it.

Edit: Changed "upper" to "lower."

 

thank you for your time in explaining the Mrev for me. thank you very much it should be helpfull

 

Why does that copper plate not look right?

 

First of all, for anyone who is confused here are some definitions:
1. Rev-Up Engine: The engine that comes with the 05 and 06 6MT cars. It is rated at 298 HP from Infiniti and has a redline at 6900 RPM and a rev-limiter at 7200 RPM. The MREV will only work with this engine.
2. Non-Revup Engine: The engine that comes with all 03-04 models and all 03+ 5AT models. It is rated at either 260 or 280 HP depending on if you have a sedan AT and what model year it is. Redline on this engine is around 6100 (i cant remember the exact number). All motordyne plenum spacers will work with this engine, but the MREV will not.
Just thought I would clear that up for people who may be confused as to what engine they have and what will work with it.

Spigrogyro: runningonmt is correct in saying that the MREV is designed only for the 05+ 6MT revupp engines. He was mistaken in saying that it was the upper plenum that is replaced, it is in fact the lower plenum that is replaced in the MREV and the upper plenum stays the same. As far as options for 03-04 and 05+ 5AT owners Motordyne still offers an option for you. You can get either the 5/16" spacer or the 1/2" spacer. These are spacers that you put between the upper and lower plenum to increase volume and thus allow more air into the engine. The 5/16" is what comes with the MREV as it is most beneficial to the design of the MREV. It will allow you to gain some power while still allowing you to use the engine cover. The 1/2" spacer is the biggest spacer and will grant you the most performance improvment on the non-revup motors. With the 1/2" spacer you will not be able to install yuor engine cover. Hope that helps.

G35_TX: What do you mean the copper plate does not look right? In what way? I installed it per the motordyne instructions. Not trying to be annoying, just trying to figure out if I did something wrong.

 

And it's a MUST that I get the spacer with the copper gasket for driving in temps. below 55 degrees......correct?

-Chris

 

To what it looks like in the picture, there is a gap on the seal. There should be no gaps.

Also the Redline starts at 7k not 6900 on the REV up engine.

 

Just ordered my 1/2" iso thermal spacer. Can't wait to get it

-Chris

 

No gap there. It's the black nitrile rubber you are looking at. That is what insulates the plenum from the heated copper plate.

 

i dont see why people R so confused about this mod.. its been used in lots of other cars for years. W/ F/I honda/acura's and all motor we always used varying length intake mani's to get diff power results.. w/ the biggest gains being w/ the f/i crowd of course

 

Just got my m-rev+ and spacers yesterday. Gonna install today. Can't wait!

 

good sh.. bro.. just be sure not to overtighten small bolts.. good lesson i learned.. is to tighten from the head of the rachet only, so you dont put too much of a stress on them..

 

what the hell is the rev up motor? I have an 05 6mt so im thinking thats what i got. Also is it useless for me to get a 5/16? im really trying to figure these cars out but everytime i think i got something figured out there is something new lol