I was reading the description for MREV2 on G35driver.com and it says:

"The average power gains on a 260 or 280hp motor (non-rev-up) are better than the 5/16" spacer. This modification increases power across a very wide rpm range. The MREV2 should be used without a spacer on the standard engine, unless fuel/ECU modifications have been performed as it may cause the engine to run lean."

Does this mean it is unsafe to do both a spacer and MREV2? I don't totally comprehend this, can someone help? I tried searching, but didn't find anything too similar. Would it be bad to do MREV2 + 1/2 Spacer?

"unless fuel/ECU modifications have been performed as it may cause the engine to run lean"

^^ Is it hard to do this & how do you do it / Is it a MUST?


If I can only do one or the other....Which one is recommended by the forum?

 

IF you install both, without having a ecu reflash or tuning service done on a dyno on a non-revup you will run lean and possibly lose power. I don't know of anyone who has a nonrevup and installed both the MREV2 and spacer combo as this combo is marketed for revup engines.

The MREV2 may give slightly better gains than the 5/16 spacer on a nonrevup, but not that much.

Since the spacer is about $200 cheaper than the MREV2 and gives very similar gains, most will tell you to get the spacer.

 

the MERV2 is really for the ruv-up... just get the 5/16 Spacer

 

The spacer is the better bang for the buck, but the MREV2 without a spacer will net slightly better gains on the nonrevup. Or you can just modify your nonrevup lower plenum yourself for similar gains.

 

Doesnt the 1/2 spacer give you better HP? <-- According to everythingg35 description it does.

After reading that it got me thinking.. If a larger spacer get you more HP... would the skunk 5/8 get you even more?

Or am I looking at this incorrectly?

 

its not all about peak power. The 1/2 spacer may have a higher peak power than the 5/16, but it peaks high in the rpm range. The 5/16 spacelr makes decent power across a more usuable power band.

MD>skunk imo

 

Not completely true, the 5/16 and 1/2" spacer's powerbands crisscross back and forth through most of the mid-upper rev range. The 1/2" seems to have more area under the curve on average though, so it should make more power overall. Most people don't use the 1/2" because of clearance.

 

who wants a strut bar anyway???

 

With the non-revup motors you don't need the MREV2. And with the spacer
you can use the 1/2" spacer and still have a upper strut bar, I do! With the
taller spacer you won't be able to use the OEM engine cover, that's the
major difference.....I didn't like it anyway.

 

the yellow line (5/16) seems to be higher than the green line (1/2) for the most part until after 5000 rpm. Non revups have a redline of 6500,no? More area under the curve for less than 2000 rpm does not seem to be worth the less area under the curve for the most part up to 5000 rpm imo. But to each his own.

 

In a race, more time is spent in the upper RPM's where the 1/2" shines. Tony at motordyne will tell you the same thing, depends on your priorities though, I was simply pointing at that the 1/2" spacer doesn't just make more peak HP.

 

^^true enough, in racing conditions the 1/2 would definetly shine, I was just thinkng about daily driving is all. What u say about priorities is very true.

 

Yep, in daily driving though, I shift between 3-4k, neither really has a significant advantage. If I rev any higher than that, its usually straight to redline, no stopping inbetween really. I have a revup anyways, those plots don't apply to me.

 

Hi guys,

Below are bar charts showing the average gains within a specified RPM range.
It was all calculated in Excel and the values shown are accurate to three decimal places.

The bar charts take the guess work out of looking at the line graphs.


The 5/16" spacer, on average across the entire RPM range, makes more power. This is better suited for everyday use.





The 1/2" spacer, on average from 3rd gear redline to 4th gear redline, makes more power. This is better suited for road course or drag racing.




But as you can see, the differences are still small.
Either will make similar gains.

 

^^^ youll run lean but the power gains and sound is awesome