You need to click the link in my signature for the answer to your questions. It's called the top 100 questions thread.

I don't know where you got your facts. I would say get the MREV2 by itself and no spacer.

 

Wired... Am Getting The Mrev2 And I Already Have The Plenum Spacer.. I Hope I Get Something Out Of It On A 04 Z Mt

Sweet Dyno

 

I believe, this is what has been posted here by Hydrazine about the MREV2 and spacer, and it's been backed up by several independent dynos. If you have a rev-up, get the MREV2, the spacer will get a little more HP. If you don't have the rev-up, the spacer is what will net you the most HP, but the MREV2 will add marginally more. There have been so many posts on this I may have it mixed up, but if I do, Tony will straghten me out. I KNOW the MREV2 and APS Tall-Boy (which is essentially a spacer) have made a perceivable difference in mid and upper RPM HP on my car. Bottom line, get both.

 

Thanks Wired, you da man.

 

Actually I believe it's the opposite from what I've seen in person when we did testing.

The rev-ups with MREV2 didn't do too well up top without the spacer. (midrange gain was insane though)

My non-revup did about the same with and without the spacer and only the mrev2.

If tony wants to correct me then that's fine, but this is what I remember from past dynos that have been posted.

 

Sorry, read this whole thread and still trying to get the conclusion here.

I have a '03 non-revup engine with 5/16 plenum spacer. Is it worth it for me to buy the MREV2 and install it? Will the gains be worth it or will it just add a bit?

Sorry, your dyno graph didn't specify if the car that was tested was a revup or non-revup engine so I couldn't come up with a conclusion.


EDIT: nevermind, found your other thread, looks like I just might have to buy another damn mod, LOL! BTW: If you are thinking of going turbo in the future, this mod will work well with a turbo, correct?

EDIT2: Wholly crap! $450usd is expensive >_<;; Is there any group buy going for this yet?

 

Hey there. Rev-up motor redlines at 7000rpm. I don't need to specify. Or wait, maybe I do if people don't understand this...

P.S. I'm still thinking of F/I in my future, although it won't be anytime soon. It will either be the JWT twins if they get CARB approval, EVER... if not, vortech (already has carb approval).

Time frame for F/I + built motor is at minimum 2 years from now, maybe as much as 4. I plan to keep my car until it blows up one way or the other

 

About the redline at 7,000... An aftermarket ECU or piggy back could change your redline on your non-revup engine.

Yeah, I'm thinking it will take 2-3 years to go turbo as well >_<;; I think I've decided to stick with this car for a long time instead of getting the next generation Zed. But who knows...

 

that's just the thing though, since my redline was at 6600, you can be assured it's not revup.

Technosquare ECU reflash bumps redline up to 7100 for non revup, and 7500 for revup.

 

Ah, gotcha.

 

POLL:

465 for MREV2 on a 04 MT Z
or
springs and shocks

 

No, you are mistaken, and I have it correct. Tony from Motordyne has stated as much several times. Just one example:
https://my350z.com/forum/showpost.ph...1&postcount=10

 

Anyway, think whatever you want but I was there (with Tony) when we did the original MREV2 testing (non revup AND revup).

You're misinterpreting Tony's post. He said "if you do only one, get the MREV2" because of the large midrange gain.
Since most people don't take the car up to redline every day, Tony said that because you will feel the difference in torque in the midrange during daily and "spirited" driving.

However if you're interested in top end power MREV2 by itself actually hurts on the revup (but adding spacer helps mitigate this effect). This is clear due to the effect of lengthening the runners. A plenum tuned for high RPMs is always going to have shorter runners than a plenum tuned for lower RPMs.

Here's the difference: on the NON-REVUP the MREV2 adds about 12-13hp, but adding the spacer doesn't make a huge difference at least not without tuning.

Hope this helps... but I'm right.

 

i hope i dont get flamed for this, but for the rev-up motor the gains with the mrev2 + 5/16 are considerable right off the line, but for the pre-06 Zs does that mean we need to buy EM (greddy, SAFC, piggyback, etc.)?

 

you don't NEED to, but it's apparent that EMS/tuning can unleash more power (See my thread "My progress with cipher" ). I recommend doing more mods before tuning though.

 

With all due respect, and I don't have to 'think whatever I want', I am simply quoting Tony and what has been reported elsewhere. "On the REVUP engine, a spacer alone doesn't do much if anything." Read his statement. This is based on the fact that on the revups Nissan alleviated the two front cylinder air starvation problem, and therefore a spacer makes little difference. He is indeed referring to horsepower gains somewhat below the redline. A spacer may add 1-3 HP at the top end. The MREV2 will add 20+ HP anywhere below that. THAT is a FACT.

 

First of all, you're not wrong with everything you're saying, but you're missing some pieces. In fact you're right, mostly. Except for the parts that I'm pointing out.


Let's go back shall we...
You said that "the spacer will get a little more HP" ... in reality, if you don't get the spacer with MREV2 with the revup, you will be hurting in the upper range. As in you will have a loss.

Example:

What tony didn't say here is that MREV2 lost power in the upper range when no spacer was added. Adding the spacer either eliminated or mitigated the loss up top.

This is what I've been saying all along.

Tony and I are talking about the same phenomenon.

I also re-emphasized here:

[/quote]


You said this:
I found something somewhat arbitrary in what I said before:

Let me correct this. This should read:

"adding the spacer ON TOP OF ADDING THE MREV2 doesn't make a huge difference at least not without tuning."

Of course, adding the spacer by itself (without MREV2) helps. I never disputed this.

But the MREV2 by itself, no spacer, is the best bang for your buck (NON-REVUP)

for the REVUP, the winning combo is the 5/16" spacer with the MREV2. But forget getting the MREV2 by itself, unless you never take the car to redline.


Here are the dynos (Again). First we did the MREV2, and dyno'd. Then added the 5/16" spacer and dyno'd again. You can see... not much difference.

Obviously it works both ways. If you get the spacer you will have gains, then adding the MREV2 will not do much (without tuning). Likewise, if you get the MREV2 you will have gains, but adding the spacer won't do much (without tuning).

My opinion has always been for the NON-REVUP guys to just get the MREV2, no spacer, and do the core exchange. This is to get the best bang for your buck.

undrgrnd, you're NOT WRONG at least for the most part, but please stop trying to discredit me! I know WTF I'm talking about... jeez

 

Yea, what Wired said is pretty much what I have read (and I have read a lot about the Mrev series and the spacers...) good job

 

The thing is undrgrnd is like 99% right, and in trying to correct the 1% its like I've started a war...

 

Yea, although I don't have the personal experience with this that wired24/7 has, I installed the MREV2 on my revup and have seen the results on the revup first hand. I know nothing about, and never made any assertions about the non revup motor and MREV2. I will accept your conclusion that I am 99% right w/o bias. Unfortunately, in reaching that conclusion it has become near impossible for a newb to tell what we were trying to explain in the first place. I have seen Tony summarize how each motor responds to the MREV and spacer, but I can't find it.