I have looked at several threads about the MREV2 and 5/16" spacer and I am wondering why everyone thinks having this combo is amazing? I've also taken a look at the dynos from Motordyne and even addressed this question to Tony on his product thread (but didn't want to make it seem like I am tearing down his product). He basically agreed with the following, but I wanted to see what others thought on this as well:

If you take a look at the dynos of these things, it is obvious that MREV2 with the 5/16" spacer gives you a lot more power and torque at the 5600+ RPM range. Sure, this is great, if you plan on keeping your car at those revolutions (I rarely do, as a daily driver, and I drive it fairly hard from time to time. I rarely ever keep my RPM's that high consistently, however). On the other hand, you can see that the MREV2 loses power and torque ALL ACROSS the band (well almost, it's actually something like 2000 RPM until 5500 RPM). All that high end power you get for keeping your engine at 5600 RPM + you lose in your mid-range (not exactly equal, but you get the idea).

It seems to me that for normal-to-aggressive driving, it would make sense power-wise to JUST get the MREV2 and no spacer, otherwise you are just blowing extra money and losing on the mid-range. You would actually be spending money to decrease your power at that point. If for some reason you are consistently racing at 5600 RPM +, it is obvious that the MREV2 + 5/16" spacer is a good combo, however.

I'm still debating on whether to get both, but I really think the dyno speaks for itself about the spacer just being a complete waste of money due to the fact that it decreases your power all across the band and spikes up the high-end.

Anyone agree/disagree? I'm simply trying to figure out whether getting both is going to be an efficient use of money. Personally, I think the G coupe needs more power on the low-mid range since it is kind of sluggish on acceleration, so it makes sense to not damage whatever low end power it has. I have an 05 6MT coupe btw.

 

Haha Sorry but that's nooooob Spacer, beginners mods, but it's ok, seeing your post, I can tell you're probably still NA. Especially with your sig saying you already have a list of mods, must be bolts ons. In my opinion, no more questions ask, just buy it. We can only do so much to modd our cars without going internals and forced induction. I have no regrets getting a Plenum, I bought the Kinetix Plenum and I can definitely feel a difference when driving and punching it. It's small cost mods. Go for it, you're going to gain much more hp then you think you are especially for the price you paid, bang for your bucks. Especially with the MREV and the spacer, now im settled with the spacer and I'm loving it no regrets It seems like you want the mod but don't know if it's worth buying it, well you ask for opinions, and yes it is on my perspective!!!

 

even if i am losing power? lol

 

I think you are looking at the plots the wrong way.
Its just the opposite. The MREV2 with spacer makes very large gains in TQ over a very wide range of RPM.

And even though the peak power occurs at ~5600 RPM, its still higher than stock. And the average power in every gear is higher than stock weather you shift at redline or at a lower RPM.

No matter how you shift, the HP and TQ is always higher with the MREV2/spacer combination.

Tony

 

If you look at my test results:

https://g35driver.com/forums/tuner-dyno/203304-motordyne-5-16-spacer-mrev2-dyno-test.html

You'll see that the spacer gained power consistently all the way to redline starting at around 3750 RPM, with no loss of power below that level. Zero downside to this mod.

You'll also see that the MREV2 did not lose any low end power but gained huge amounts of torque and power starting as low as 2900 RPM and topping out around 6250 RPM. This gives you huge improvements in area under the curve in the meat of the powerband, making the engine far more responsive in daily driving in every gear.

I couldn't be happier with the way these two mods, combined with the Stillen intake and exhaust, have transformed my daily driven G. The car is soooo much more fun to drive now, with the improved sound quality and greatly enhanced throttle response and power output in the 3-6k rpm range.

 

I didn't compare mine on a dyno but i can tell there is an improvement. I recently installed the ISO MREV2 and 5/16 spacer on my 2007 6MT coupe and i can tell the difference. It's easy for me to tell it pulls throughout the powerband compare to when it was stock. Oh yeah the sound is much more aggressive now too.

https://g35driver.com/forums/intake-exhaust/206412-mrev2-5-16-space-install-pics.html

 

Just do it....! You'll never find another mod that will increase HP at such a
minimal cost. You can tell the difference from idle the minute it's installed.
To really feel the advantages of having this mod you'll need to get more air in
via a better intake and a high flow exhaust. Modding our cars is a sickness
once you begin there's no place to stop....

 

I was looking at this one primarily:
http://motordyneengineering.com/imag...page_large.jpg

"No matter how you shift, the HP and TQ is always higher with the MREV2/spacer combination."
This isn't true according to the dyno. The blue line is MREV2 w/ spacer and green line is just the MREV2. You can see that from about 3560RPM to 5120 RPM (which is the range is spend most of the time in, or at least more often than above 5120) that the green line is higher than the blue line. This is otherwise illustrating a loss of power in that range with the spacer and MREV2 combo, as opposed to just the MREV2. This tells me the MREV2 is better to have alone, without the spacer, in this range.

Also, the lower range, below 3560 RPM, the blue and green lines are pretty much neck to neck, signifying almost no increase in power in that range with the MREV2 and spacer combo. This just shows me that the spacer wouldn't make a difference here, and the MREV2 is enough.

"And even though the peak power occurs at ~5600 RPM, its still higher than stock. And the average power in every gear is higher than stock weather you shift at redline or at a lower RPM."
The upper range, above 5120 RPM, we can see the blue line gaining substantial ground above the green line. This is that high end added power we're talking about. This shows that there are great gains at the high-end of the range with the MREV2 and spacer combo. If I was to be driving above 5120 RPM almost all the time, the MREV2 AND spacer would be a great buy for me. I would still have to consider the loss of power in the mid-range. You are right, if we are just looking at peak power, the MREV2 and spacer combo hikes up that peak power, at the sacrifice of mid-range power.

I am trying to make the distinction between getting the MREV2 or the MREV2 and the spacer combo according to the dyno graphs. It seems the combo is really kind of a waste of money in order to hike up peak power at the sacrifice of mid-range and no gains at the low-end. I am sure there is an improvement when both are installed at the same time, but according to the dynos, there would have been a better improvement with just the MREV2 versus the combo. It's not just ONE mod, we're talking about 2 (spacer and lower collector), and I'm saying MREV2 looks like it would be better to have alone. I'm in no way arguing that either one of these products or the combination of the 2 is not an improvement over stock.

 

I miss my md mrev2/spacer combo. If I don't go f/I in the next few months, the cos might come off and the md combo might come back on.

 

op, in that dyno graph u linked, the green and blue lines are practically on top of each other until 5640 rpm, when the combo greatly surpasses just the mrev2.

The combo is sound and proven over and over again. I think u r still confused.

 

Just wondering, if this is such an obvious and easy way to get a few more hp, why didn't Infiniti just design the plenum this way in the first place so that we didn't need a spacer?

I am not doubting this mod, just wondering.

 

u can ask the same question if/when tony reveals his exhaust components that give a claimed 10 whp/40 lb tq on top of exhaust gains.

Tony has worked closely with reps from nissan if I recall correctly. Best believe nissan has taken notice of md's improvements on their de plenums.

 

Yeah, they are real close, you're right.

 

"No matter how you shift, the HP and TQ is always higher with the MREV2/spacer combination."

This is relative to stock.
If you want to compare it without the spacer, yes, it makes a little more TQ (~2 ftlb) without the spacer. But either way, it still makes MUCH more than stock.

Also, the lower range, below 3560 RPM, the blue and green lines are pretty much neck to neck, signifying almost no increase in power in that range with the MREV2 and spacer combo. This just shows me that the spacer wouldn't make a difference here, and the MREV2 is enough.

Yes, if you don't approach redline, you don't need the spacer. There are many others here on this forum doing exactly that.

 

Tony, I have those dynojet files we talked about before. How should I send them to you?