I love how you did the second dyno run, next May.

-Acree

 

Is this a Motordyne modified lower plenum? This isn't a DIY is it?

 

I was wondering who would catch that... ever notice how extremely often dyno times, dates and/or even the car on the dyno is wrong?



GDit, this is a motordyne modified lower plenum with additional work by me.

 

I see. For the record the MREV++ and MREV2 is the exact same thing. Some people just call it the MREV++ others an MREV2.

 

I think you have the MREV+. The MREV++ has extra machining done. At least that's what I've gathered from the countless confusing posts I've read

 

The MREV is simply a non RevUp engine's lower collector. The MREV+ is the MREV with some machining modifications. The MREV 2 has been modified even more than the MREV+. Yes, it was quite confusing, to say the least. However, the designation MREV++ has been dropped. The newest version has now been formally named the MREV 2.

So, now depending on your set-up . . . You have either the MREV, MREV+ or the MREV 2 . . . Thus, sparing us all from the confusion.

 

andy, we know he has at least mrev+ or mrev2 because he did say the runners had been machined. We just don't know how much machining has happened.

 

This might sound strange, but after driving a hundred miles or so the powerband is now different. It feels like there is better throttle response in midrange and maybe a bit flatter torque curve all the way to redline. Just wanted to updated my findings. And now my "Service Engine Soon" light is on, hope it goes away soon and/or I can get a tune...

 

Wren, have you found the source of the CEL? Any plans of having a dyno completed? I am considering this combo (I acutally have a MREV-2 on the way), but the 'too lean' conditions I have been reading about are making me rethink my decision on the MREV-2. Hopefully someone will have a dyno of the Crawford/MREV-2 combo with AFR readings to post and help make my decision final.

 

I don't/won't have a dyno of this and I never found the source of the SES light but when I disconnected my blown sub from my amp it went away... weird.

 

I have heard that if you combine plenums like you did Wren, you don't gain power or you can actually lose hp/tq. Its too much air for the ecu to read. I think thats why you got a CEL. I wanted to try this also by adding a spacer with my lower plenum, but I was told it might not do anything. Dyno it and find out. Compare before and after runs.

 

Too much air? There can never be too much air in the engine, but there CAN be too little fuel in the engine. I really think once I get enough scrapped together to get my headers installed and an EU tune the full advantage of this mod will be felt.

 

How long can the VQ35 run lean before bad things start to happen or things go boom? Thanks.

 

FWIW, the MREV+ has two of the six collectors ported and the MREV 2 has four of the six ported. That's the difference...at least officially. Polishing makes a C-Hair of a difference and I have that knowledge from a VERY good source.

I am letting my MREV 2 sit on my counter until I can safely figure out if installing it in conjunction with my Crawford Plenum will lean out the car too much b/f getting an AAM Reflash.

 

bosssho, do i have to worry about installing MRev2 since i dont have any plenum modifications??

 

Not at all...if you have no spacer and or upper plenum mod you can go ahead and install the MREV, MREV+ or MREV2.

Also, for clarification since I was going off of a major miscommunication (That I can't believe I haven't been hung out to dry on yet ) The breakdown is as such.

MREV = OEM lower collector from any non rev up VQ35 made just for REVUP 298 HP engines b/c they lost so much torque, etc vs. non revup engines.

MREV+ = (Without giving away ME secrets) a trimming and polishing of the lower collector in key spots. Not porting of the actual inner runners as I always thought.

MREV2 = More of what was done to MREV+ in more key areas to increase and smooth out air flow.

I am actually blown away that what is done creates so much of a positive increase in both HP and TQ. Congrats to ME for what must have been a lot of R&D.

I would think FI cars would benefit from hogging out the runners themselves big time...but maybe NISMO needs to come out with a larger diameter MAF and TB b/f that stuff could even be taken advantage of.

 

bosssho,

I don't know what you mean by the two additional intake runners being ported. The MREV2 (BTW Tony told me that it is a MREV2) I purchased 4 weeks ago has the top milled out and blended on intake runners 1 & 2 only. There are no noticeable differences between the stock lower plenum and my MREV2 on intakes 3 & 4. This was also verified by G35 6MT on the g35driver thread as well (see here: http://g35driver.com/forums/showthre...=92810&page=7). I don't want to think I got a MREV+, especially when I was assured otherwise...

Please explain what you mean by "additional porting" in the other intake runners? Are the tops on those other runners also milled out? They are definitely not on my MREV2.

Do you want to exchange pictures of our MREV2 lower plenums via PM to confirm? All this confusion here stems from not knowing what the exact differences are between the MREV+ and MREV2. At this point, the differences really should be published or at the very least explained privately to the "early adopters" of the MREV2...

 

This is what I was afraid of. I addressed this in my last post, but you must have caught it before I posted it. Sorry bout the confusion, but I was wrong before...dead wrong actually, and your confusion is b/c of that.

You are correct in what you think the MREV2 entails so no need to exchange pics or anything. It's exactly what you described. I was under the impression it was a porting of the runners, but like you mentioned, it's all on top of the runners on the actual topside surface of the lower intake plenum collector...so no worries, you got what youpaid for and you are all set!

 

To clarify, your MREV2 lower plenum only has the milling and polishing on top of runners 1 & 2 and there are no modifications on top of 3,4,5, or 6 right? There are other areas that looked polished up along the sides closer to intake runners 1 & 2 but that's really about it.

Still don't know what the exact differences are between the MREV2 and MREV+ though.

 

You are correct, but if you had a MREV+ and our MREV2 lower collectors next to each other we would have a lot more shiny spots. I am sure you know what I mean.

PM me if you have any concerns, but I think you are all set.