Chef was telling me which is which for a normal VQ i know you dont want both on a Non-Revup but which one will give me more TQ.

 

both is fine just make sure you get an mrev, not an mrev2.

 

wrong answer you allready have an m-rev, all that is is a non revup lower collector. an m-rev2 2 is a non revup lower collector with porting work done to it.

jim to answer your question you want the m-rev 2 for more torque and you want the spacer for more top end horsepower.

if you do both together on a non rev up its definaterly time for a tune and dont expect more then 5 or so horsepower from the spacer being added to the m-rev2

 

i thought for a non rev up the mrev2 really didnt make any power

 

depends on what you consider making power
M-rev will make more tourque then horses, but will still make horses under the curve. The power you gain won't raise your peak horse much unless u use the spacer but then you don't get the tourque or power under the curve just topside numbers

It is a trade off for one or the other just personal preference i guess

 

Jeff u are correct with all that info and i will be testing those things on my dyno soon i hope. I will make base runs and then with spacer and then with plenum. i will also make one with plenum and spacer together to see what we get but gotta get some money together first

 

Well i think i'm going to pick the Mrev2 up to see if i can get back some of the TQ i lost bottom end due to the Lighten Flywheel setup. I might look for some headers too, any suggestions on a brand?

 

Do you have a non rev-up motor? If you do, don't bother with the MREV2. Any gains you get won't justify the cost. Just get a spacer. Another thing...... how do you loose TQ due to a lighten flywheel???? Never heard this one, but I'm curious. Never mind I see you have an 05. I have an 06 and when I put the Mrev2 & 5/16 on I lost peak power but gained it through the power band. After swapping out the spacer for a crawford plenum (which is basically a 1/2" spacer) I gain a little more peak to almost get me back to my peak numbers with my rev-up lower on. Difference was the power band was flatter than before and my TQ numbers were better. You have to remember that when Tony did his dynoing, it's on a stock car and if you have engine mods already, forget it, you won't get his numbers. I'd love to see your dyno's Philly to compare to mine.

 

Not to start a debate but there is already dyno sheets avaiable on this forum that show the mrev giving nice gains on a non revup motor by itself. I will try searching to find them and post if I find them.

Keep me posted on the dyno Philly I'm confident they will prove me right.

Jim I got crawfords headers and they seem to do well.

here are the dynos compare for yourself...heres the link to the thread
https://my350z.com/forum/showthread....ghlight=mrev+2

 

You loose TQ from a lighten flywheel cause your reducing the amount of Mass that flywheel had. Basically it went form being a ~40-50 pound flywheel to a 12 pound flywheel. My brother could explain it better but thats about what i could grab from it.

 

Jeff i'm looking at the Crawford headers an the DC i see alot of people are pretty much like if its not crawford its DC an its if nots DC its Crawford.

 

a lot of people say that you don't get much from headers on a 350 unless you match them with a cam. I'm still reasearching that whole idea but if you plan to go cams or want to see better gains from headers its worth looking into to save yourself from making a wrong choice later.

 

oops sorry.

 

Will see how far i actually take the car right now i'm just looking for a decent set. I'll probably end up going with a Forced Induction Cam but then again i'll leave all that up to my motor guy if i go that far.

 

jim did u go to long island?

 

Nah the dude sold the kit before i could get around to it.

 

that suck i would love to overlay the dynographs on top of each other so i cam see the powerband gains. I gues i will have to do them myself later.i like the crawford headers but i don'y know if i wanna go with headers if they only make minimal gains and thier a pain inthe a$$ to put in

 

Stock dual mass flywheel is 27lbs... and I have no idea how you could possibly lose torque.

 

You cant loose torque from a flywheel swap, it has nothing to do with the engine at all, it is simply rotating mass that you are reducing in order to spin faster, if anything it is the other way around because you are wasting less power to turn a lighter flywheel.

 

the stock flywheel weights 33lbs, i weight it. as for the argument on losing torque, i will explain it as simple as possible. you lose low end torque when you take weight from the flywheel because you losing mass. their as pros and cons for everything thing you do to your cars. for every plus theirs a minus, get it. this the simplest way i can explain this. (example 1) you have two engines making the same amount of block horsepower and torque, but one has a 15lbs flywheel and the other has a 30lbs flywheel. now if both engines are spinning 3500rpm which one is harder to stop? the one with the heavier flywheel has more rotating mass which make it harder to stop. this will create more low end torque, but rev slower. (example 2) my brother Z ran 14.2 leaving the line at 2000rpm. now with the lighter flywheel my brother car has to leave a little higher in the rpm to match his same 60 foot time, but in theory now since the car can rev faster with the lighten flywheel it should turn a faster 1/4 mile time. all and all, stoplight to stoplight, my brothers car is a little harder to drive than it use to be. does that clear things up for you guys.