I searched the forums for anyone giving a more detailed personal review on the 5/16 spacer w/ mrev2 after getting it installed, but I found the same general synopsis of it just being great and it being a must have on the Z.

So I am going to attempt to explain this even though you just have to drive the car to get a better understanding of what I am trying to say.

I was able to get the 5/16th spacer, TB heater (I'm in NY) and mrev 2 installed by an infiniti dealer mechanic whose a great friend of mine. He flew through the installation by just having all the right tools and experienced knowledge on this motor as I observed along with Motordyne manual making sure everything was official.

I had this installed on Tuesday and have been driving the car everyday feeling this thing out (80 miles a day). I definitely feel more power when accelerating. There is no question to that. You can hear more air flow being sucked in and used to get this baby moving.

However bare with me as I try to explain this:

In the morning or whenever the car has sat for several hours at its coolest temp. (65 deg. this week) - I let it warm up for all of 5 minutes. Pulling out the garage at 10-20mph you can barely hear anything. Car sounds like its natural stockly tuned self.

I jump on the highway and start to get on it. The feel and sound has some added volume but not much and still remains smooth, even, and tune-ish if thats a word.

Now if it always sounded like this then we wouldn't be having this conversation, but after an hours drive or at the end of my day of driving here and driving there, acceleration from stop lights and navigating back to my parking spot in the building's garage has gotten louder, rougher and raw if you will.

As soon as the gas pedal is pressed even if its lightly to roll out of 1st you hear the mrev2 and a deep untune-ish sound. On the highway at this point full out the air seems choppy and gappy, not one continuous suck of air when hitting the gas pedal. I guess I am use to hearing the stock intake suck air at a more controlled rate giving a better sound and now when I am hearing the added roar the mrev2 makes it seems raw.

Note:
I have no other mods such as exhaust, intake, headers etc. I do however use the K&N filter in the stock air box.
I have the 35th Anniv Z.

So is all of this expected and sound right to you or do I sound crazy. Thanks in advance for anyone who actually read all this.

 

Its probably just fine. It should be deeper and louder.

Can you post a sound clip?
Or better yet, take a ride in a non REVUP Z with a plenum spacer and no other mods (like yours). That Z should sound the same as what you have now.

 

I get the same thing. I have had mine on for about two weeks now. When I get off the highway and am headed home I hear it gets more deeper and more raw sounding I assumed it was normal because the car runs great and there are no idling problems.

 

There is clearly a more agressive induction sound with this setup.

 

I think for christmas I'll pick up an MREV 2...would like to hear some more feedback from some of our members though. Keep this thread going.

 

If you have a 2006 6MT, you definetly should use a MREV2 with your spacer.
It will make more power gain than any other bolt on.

For more MD feedback (in addition to this thread) there are countless threads all over this board and others.


Here is a small fraction... there are way too many to link

http://g35driver.com/forums/showthread.php?t=163134
https://my350z.com/forum/intake-exhaust/223262-best-mod-ever.html
http://g35driver.com/forums/showthread.php?t=45736
http://g35driver.com/forums/showthread.php?t=172389
http://g35driver.com/forums/showthread.php?t=167699
https://my350z.com/forum/intake-exhaust/260024-kinetix-v-or-motordyne-5-16-isothermal.html
https://my350z.com/forum/intake-exhaust/273703-finally-answered-what-is-the-best-__________-intake-exhaust-headers-etc.html
http://g35driver.com/forums/showthread.php?t=156487
https://my350z.com/forum/intake-exhaust/272585-higher-gains.html
https://my350z.com/forum/showpost.php?p=3575318
https://my350z.com/forum/showpost.php?p=3646089
http://g35driver.com/forums/showpost.php?p=1752616
https://my350z.com/forum/showpost.php?p=3300726
http://g35driver.com/forums/showpost.php?p=1600136
http://g35driver.com/forums/showpost.php?p=1594797
http://g35driver.com/forums/poll.php...ts&pollid=1086
https://my350z.com/forum/showpost.php?p=3021063
https://my350z.com/forum/showpost.php?p=1792623
https://my350z.com/forum/showpost.php?p=1801301
https://my350z.com/forum/showpost.php?p=2234990
https://my350z.com/forum/2868486-post.html

There is plenty more available with a quick search.
There arent many easy ways to get NA HP out of the VQ but these parts really work.

 

If you have a rev-up do it.... you won't regret it.

 

Consider the following response in reagrds to this:

" No, you don't sound crazy. It's good that you are that "tuned-in" to your car. You said you had the parts professionally installed. The only thing I could attribute some of those inconsistencies to is a minor intake leak. Like if everything wasn't installed quite right, or there is a minor leak at the spacer. Overtightening the plenum bolts will crush the gaskets too much and could cause an intake leak. That's the only thing I could think of. Might be worth checking out. "

What are some methods I could use to determine this?

 

go grab a can of carb and choke cleaner from your local parts store and spray it with teh straw on at the gasket, top and bottom with the engine running... you'll hear the engine rev up or sound like it is about to die, depending on the engine sometimes... and whereever you are holding the can is where the leak is!

 

That sounds pretty similar to this other advice I received:

"Primitive but effective method is to remove the engine cover to expose the intake. While the engine is running, spray starter fluid around the spacer and lower plenum area - basically wherever it seals together.

If the engine surges slightly (rpm's raise) while spraying the starter fluid, you have an intake leak."

Thanks for your suggestion. I have some work to do tomorrow. Will let you know. Also when you say spray at gasket you mean where the spacer meets the top and lower sealed areas right?

 

The descriptions so far don't sound like a leak of any kind.

The first and foremost thing a leak does is upset the idle. Lumpy, unstable or barely able to idle.

An air leak doesn't affect WOT performance unless its a really, really big leak.
And if your car idles OK. You don't have a really big leak.

If you have any unusual sound, it is probably something other than a leak or there may not be any problem at all.

Can you check it against any other Z's?

 

When you start it should the RPMs sit higher then normal for a second, I had my MREV2 an Headers installed this weekend an on cold starts it goes up to about 2 grand then comes down about 5-10 seconds later to normal.

 

That's probably normal. The ECU has a feedback loop where it monitors, adjusts RPM, monitors RPM and adjusts RPM again. It does this untill it reaches its target.

Usually a few seconds to stabilize at start up or a blip of the throttle.

Try a quick stab of your throttle (while in neutral) and as the RPM's come down you can hear the feedback loop do its up/down work of searching for and stabilizing the idle.

 

I wouldn't reccomend starter fluid for finding leaks... primarily because the stuff is so flamable that you might just hit something precious... like your whole engine.

 

I had my 5/16 spacer installed two weeks back, and I don't notice anything you've described.

 

What I am describing may be more related to the mrev2 and how the air passes in that area.

I wonder if getting it polished would have a smoother feel or consistant air flow?

Or is it not worth the money to take it out, send it out to be polished, and install it back in.

I saw one person on here selling a polished mrev2, but I haven't heard that catching on to others.

 

Well, I dynod a port and polished MREV2 a while back. It made a tiny blip of 4 HP about 500 RPM wide at ~6000 RPM.

I didn't try to listen to the sound but I didn't notice anything different about it.

I doubt a PnP will do anything to the sound.