Tryna search thru all the millions of threads is difficult so i figured id ask lol.
Tryna figure out whats the best manifold set-up for going FI? Im keeping a stock block and i got the mrev2+5/16 spacer. Seen a lot of good stuff bout the cosworth for FI so i was thinkin bout that also and not to forget that its awesome eye candy.
I was wondering if the mrev2+5/16 spacer is best set-up for going FI as you gain more mid-range power/torque and lose on the top end. I know the Cosworth gains on the top end but does it lose any midrange power? Is the midrange power the same as the mrev2+5/16 spacer just with the extra gain on top end or does the Cosworth lose midrange to get the better top end gain?
Can anyone point me to some threads with dyno graphs of mrev2+5/16 spacer n cosworth on FI set-ups? Would appreciate any feedback. Thanks

 

The 5/16" spacer provides a nice balance between mid and high rpm torque. When you start to push high levels of boost, the Cosworth will outperform the spacer with the mrev2.

As I noted in another thread, I started with a 5/16" spacer and then moved to the Cosworth plenum. IMO, the Cosworth is a lot of money for the amount of hp increase that you will see, but it is gorgeous. Then again, I have a DE motor and did not need the mrev2. By the time you pay for the mrev2 and the spacer, the price difference becomes smaller, making the Cosworth that much more tempting.

 

Terry is correct in low boost numbers the cost of the cosworth out wieghs the performance but you do add a nice eye candy factor to your engine bay. On my stock block I ran a spacer it worked fine, I also have a DE so no mrev2.

 

go with a custom tublar mani if u got the ends to buy one.
try www.666fabrcations.com or goggle them.

 

well I'll hopefully be doing dyno comparisons between the 2 within the next couple of weeks. I had to take off my Cosworth plenum because of leaking and while awaiting replacement, I have put my oem plenum with MD 5/16 spacer and MREV2 back on. With the Cos, My numbers were ~400whp/415trq at ~12psi. I'm waiting for dyno fine tuning with the oem/md plenum. Will share results as they are available. 05 revup with GTM stage 5 HKS gt sc, nismo headers, PE hfc's, Amuse exhaust, etc.

 

buy a custom one that has no flow testing done or 100s of hours testing that sounds way better than buying a cosworth one that has all of the above. Speed Force racing has a nice twin throttle body tubular mani that at least has had a ton of testing done on it.

Edit i just had a look at the 666 ones they look like rough unfinished designs.

 

The link did not work for me, but I agree with Gord.

Designing a proper intake plenum takes alot of design work and testing. In fact, if you go to the Cosworth website, you can see the fluid flow analysis of their design. A lot of time and work went into maximizing its performance. Speed Force Racing is a very reputable shop, and I'm confident in their products as well.

 

it dosent look like they even have one for a G/Z but they are $1,200 for the BMW ones much cheaper than the Cosi and they look unfinished they need some serious polishing so it dosent look like a prototype. IMO



http://ep.yimg.com/ca/I/yhst-5416831...9_2079_4364941


Its hard to find good pictures of the SFR one but here is one its $3100 I looked into it but the fabricating and install turned me to the more affordable "bolt on" Cosworth.


http://www.speedforceracing.com/index.php?productID=849

 

yea here click on link..
http://www.666fabrication.com/



Trust me i have this on my BMW and the turbo flows like a jet engine bro.. they have MAD SKILLZ

mybad i was thinkin exhast manifold but anyway they do intake manis too..

 

What do you mean the DE? The vq35de? I got an 06 revup so i had the mrev n spacer. I know it helped throughout the powerband but on the top end it fell flat. Was wondering if the cosworth HOLDS the same powerband in the midrange power/tq wise as the spacer n mrev or is it lower but more in the higher rpm?
Not looking to do anything custom cuz ima be keeping a stock block. Also tryna consider that im running a single turbo kit so it might suit my needs to just stick with my spacer/mrev and gain the midrange power but if the midrange power is the same as my spacer n mrev then i wouldnt mind buying the cosworth. But i dont wanna buy the cosworth if it looses midrange power.

 

Yes, by DE we mean VQ35DE.

The revup motor was designed to increase high rpm torque/hp over the VQ35DE. One of the changes made to accomplish this was changes to the intake plenum. These changes, however, sacrificed some of the mid-rpm torque.

Now, note that the Mrev2 is simply a VQ35DE lower plenum that has been modified to fit the revup motor. So, although it will increase mid-rpm torque, it will do so by sacrificing high rpm-torque. You can compare the two plenums side by side and the differences are readily apparent.

I did not notice any loss of midrange torque with the Cosworth. But in general, the Cosworth does not really begin to shine over the stock plenum/plenum spacer until you start getting into high boost levels. Again, there are some comparisons from a couple of years ago in the My350Z forum. If you spend a few minutes using the search function, I think you should be able to find them.

 

Thanks, will try to search for it. As long as theres no midrange torque loss i wouldnt mind going for the cosworth. Just wanna look up for some dyno sheets to see if its true.. I never really plan on goin high boost (at least not now) but for the looks and if the performance is equaled to that of the spacer/mrev without sacrificing any midrange torque i would be very tempted to buy it.