First, I just want to say that I'm not trying to mess with you. I love how a v8 car sounds so that is why I am asking this question.

Are you serious that putting a mrev2 on the Zed will make it sound like a v8 engine? Are you saying you will be hearing that "glug glug glug" sound like a v8 mustang produces? If so, I'll order an MREV2 right now instead of waiting until Spring to get it.

 

It won't glug like a Mustang, but it will make it sound more like a V8 engine if you are baselining from a REVUP engine.

You already have the NON REVUP engine so MREV2 by itself won't change the sound. A spacer will though.

The spacers make it deeper and louder on any engine due to the increased plenum volume. The 1/2" spacer is really noticable.

The MREV2 makes it even more deeper and louder (particularly with a spacer) on the REVUP engine. This is due to the longer runner lengths of the MREV2.
Longer runner lengths = lower tuning frequency (IE deeper sound) .

 

For me, the only thing that changed the sound of the engine was adding the popcharger.

The popcharger is rediculously loud but only at WOT. Maybe the deeper engine growl is coming through now that I have the 5/16" spacer on there too, but I don't have a comparison.

 

I have a non-reup engine with 5/16 spacer. Will adding a MREV2 to the setup make it sound more like a v8 or don't bother because the spacer is already making the sound.

 

Adding a MREV2 to a NON REVUP engine (with or without a spacer) will not change the sound.

Only spacers change the sound on a NON REVUP engine.

 

Ok I know this is going to probably result in some rolled eyes but are all 06's revup or not I know that before it was just the mt before but couldn't remember if at's were as well with the 06's

Thanks

 

the autos are not revup, only 6MT

 

I have a question...So I know the MREV+ was the original and then more of the metal was bored out for the MREV++ then again for the MREV2...now Im buying a MREV+ the original one from a local board member. Is there a big difference between that and the MREV2? The power difference under the curve is a huge difference? Should I just dish out another 300-400 an djust buy brand new?

 

Guys,

If i have 5/16 spacer + MREV2 will it also fit and work with Crowford plenum?


cheers,
Jerry

 

Just ignore my question.I got the answer from Tony

 

There is some difference in the power curve but if you can save 300+ bucks by getting a used one, get the used one.

It will have the majority of what it can gain anyways.

MREV --> MREV+ --> MREV2 (called MREV++ for a short time)

In the evolution of MREV's the first big improvement was going from MREV to MREV+. Going from MREV+ to MREV2 gives a little more but there are diminishing returns.

In any case its all going the right direction.

 

What are the diminishing returns?

 

He means by improving the lower plenum more beyond the design of the mrev2, you won't see any additional gains.

The reason most likely being that there are other choke holds on intake performance, for example, at the heads, MAF, throttle body...

 

+1 on what Wired said.

There are also independant dyno plots posted here showing the gains of the MREV2 over the MREV+.

It will be easy to find it with a search.

 

Are any mods necessary to add a 5/16" spacer or an mrev2 to a z? I think I've read about having to replace some parts to make them fit...

 

what about a 1/2" spacer?

 

Hey Wired...on those tow dyno's that you did it looked like the HP approaching redline actually decreased when you added the 5/16 and the MREV2 as opposed to just the MREV2...whats up with that? I was gonna get the md 5/16 but now I think I might just get the MREV2 and not even worry about the spacer. Do you think that eventually I should get the spacer also in order to get more air to the front cylinders or does that not even matter with the MREV2? Thanks - ur posts are really informative.

 

If you just look at peak numbers, it may look like the spacer lost HP versus the mrev2.

In reality, that "loss" is just within normal error of the dyno.

If you look at the charts very closely you'll notice that the 5/16" spacer actually makes peak power throughout a broader range of RPM #'s compared to mrev2 alone.

It's a close call, and the small increase in performance may not be worth the money for everyone.

 

https://my350z.com/forum/showthread.php?t=224731


ISOTHERMAL MD spacer KIT FOR SALE

 

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