I mostly agree with DN - I'm sure the additional volume and less restriction helps but what I dont like is that they say nothing about a tune ... without the tune this is essentially a way to lighten your wallet $700. I'm sure the NWP 75mm tb would help too.

 

This is what I'm in the middle of atm. Even if there are 0 gains from the upper plenum from them, not having the stupid leaking 6 center holes is great. it looks like they also made the neck wider too. The bottom looks like the normal lower plenum smoothed/lowered front inlets(mrev2 copy). From my recent exp, adding another 1/2(1 inch spacer now lol and was tuned before) spacer leaned me out. Same weather conditions, same duty cycle, and there was an avg .5 leaner throughout the pull from data logging. The extra volume helped.

 

 

Yea, most work has been done with the angle grinder with flap wheels.I was actually thinking the same thing of having a 1'' spacer welded to the upper, mostly for air leak prevention. Looking forward to ur results, reducing flange thickness.

 

I've recently had a few people order our plenum b/c of this thread (Thank You) ). I know this b/c I've had phone calls asking if it was "snake oil"....lol.

These absolutely do NOT require a tune and perform exactly as advertised. You don't have to take me word for it, ask anyone who has purchased one of our plenum pieces/sets. We obviously recommend a tune for best results, but these sets, which are being rebranded as "Version 1", have outperformed every other bolt-on modification in terms of power and improved driveablility. We also released a "Version 2" a couple months back that has a ported neck that is matched to a custom throttle body flange, and allows you to run the 75mm tb without having to clock the assembly like the adapter plates. This allows for the throttle plate to run parallel to the airflow and eliminates the bottle neck that's inevitable with any adapter. The version 2 had its first 3rd party dyno showing 30whp. Yes...30 , you read that correctly and it's not a typo. That power gain was on a DE btw. From tuned with stock manifold setup to re-tuned with the Version 2. I'd imagine the number would be a bit higher if it was untuned and stock, to the version 2 and tuned.

Shift Tech Performance sells the modified manifolds b/c changing the overall design in anyway has lead to power loss and/or fitment issues (hood or strut tower bar). You can see this pretty clearly with the Kinetix. The Kinetix looks beautiful but doesn't have any performance benefit unless you are running a boosted setup. Even then, the couple of clients that have replaced their kinetix manifold (cracked welds) with the Shift Tech Performance set found a small bump in power overall, but huge power gains in the low and mid range.


Anyways, feel free to reach out if you have any questions regarding our products or pretty much anything vq related. We specialize in building custom vq engines and have designed, prototype'd, and are starting manufacturing on everything from manifolds to big brake kits, to replacement reservoir tanks, to custom engine internals... So, we have a ton of insight z33 and z34 platforms, and are more that happy to consult any fellow enthusiasts!

Sorry for the long post but I figured it would be worth addressing the concerns here for those who might be starting their performance aftermarket journey through the forums.

Thanks,
-Jeff

 

Thanks for coming on here Jeff and backing your product.

You ought to encourage your customers to dyno before and after the install - tune or no tune.

 

Thank you for the warm welcome.

We've actually received quite a few dyno sheets over the last year. They are usually published on a FB page or sent out privately depending on our clients request. The last dyno came in a couple weeks ago from a customer who swapped out their oem upper with a Shift Tech Performance Version 2 Upper. He was running an Mrv2 (which is pretty close to what our lower is and what comes with our set), the 75mm throttle body with one of the adapter plates, and a 5/16" spacer. So, the only thing that changed was the upper plenum to the Version 2 upper with the ported neck and our optimized modifications. On a DE, he picked up a few WHP on the overall, but the low/mid range hp/trq were unreal. We were happy to see such a niche test come back with those type of results b/c it just helps to legitimize the dyno results from others, as well as our claims.

The top end power increase near redline wasn't super impressive, but it makes sense considering the design of the DE heads. Plus, this guy had pretty much maxed out what a NA DE can do without opening up the engine. His numbers were amazing to begin with so he was pumped to see the degree to which it made a difference in performance and drive-ability.



See mid range power and torque increase.

 

 

5hp increase with a ported plenum, seems honest.
If people are interested in this pay someone who knows what they're doing and Jeff seems like he does. Easy to eff up so skill and knowledge are key if you start just angle grinding your plenum you'll see losses quickly. There are better bang for your buck mods by just removing weight from the car but if you aren't going ITBs this would be on the list to do. Long tube headers and cams should come with this mod to push you over 300. Have to pay to play 😥.

 

I dont want to come across as a hater and I appreciate what youre doing ... but 11ft*lbs is a 4% gain ... is it really that noticeable?

 

dnash: I don't know what intake he was using, but I believe he told me had a pop-charger.

bealljk: "is it noticeable?" Yes. 100%. Most enthusiast can tell you the temperature outside by how the car is driving lol. I will also point out that the power gain from that graph was to illustrate a very specific change. That gain is the result of JUST changing out the upper plenum while already having an mrv2, 75mm tb, and spacer. The gains from replacing them all at once with the Version 2 set that we sell has been showing around 30whp. That is the difference between a DE and VHR. Nobody on the planet can drive those back to back tell you there wasn't a substantial difference.

I totally understand that there will always be critics and non-believers. That's totally fine. The way I look at it is this: Smoother idle, smoother rev, better gas mileage, better sound, more power, engine bay clean-up (with color coordination option), exclusivity from the herds of followers that all do the same boring stuff, and best performance of all the other mods that also don't make any real power.

If bolt-on power doesn't do it for somebody, we build custom engines, turbo kits, and supercharger kits. Intake manifolds were just something we designed to work in conjunction with an NA rev-up build that were finishing up, that incorporates all of our product line and expect to break a few records with.

 

I appreciate the response - Youre alright in my book!!!

 

That's just the peak gain. Imagine that same 4% being throughout the powerband. Yes, definitely noticeable.

 

That's the plan. I'm at 292whp right now with FBO and 264 degree cams. I'm sure this intake + a 75mm TB and intake will push me out past 300whp at the top end. I think it's a great piece of kit for those who don't want to sacrifice low and midrange grunt for top end power, like what happens with the Cossie and Kinetix manifolds.

All those breathing mods on a supercharged DE would make for a more reliable SC Z in my opinion. Breathing mods bring down boost since there's less pumping losses while retaining power, which makes for a more reliable engine at X whp, or the ability to push the boost back up to compensate and make a lot more power. That's my plan, anyway.. Some day.

 

Huge time saver from what I can see, yes you can do it yourself if you want but it's a lot of chipping away.

My only suggestion is that it could have the neck adjusted like previous people have done (some examples on this thread), as this is literally the bottle neck (esp for DE):
https://my350z.com/forum/showpost.ph...&postcount=133

 

This is My dyno graph, I am running furookie 3.5" intake and it's a 1/2" spacer. The car is a 5at, I posted the specs on g35driver. https://g35driver.com/forums/tuner-dyno/465447-04-5at-g35-dyno-tune-w-full-bolt-ons-c8-cams.html#post7157352

 

So the dyno wasn't just the upper plenum change according to your G35 post, you also changed out the 5/16's spacer for a 1/2" plenum spacer along with Shift Tech's lower manifold?

 

I only found this thread while searching for other "ported plenum" projects, as this is something I'm doing. From the link: "The greenline is with the 1/2" spacer, ported lower plenum runners and shift Tech performance plenum. The red line is when I had a 5/16" ​plenum spacer and stock lower and upper plenum.​​​​​​"

So the green line would be for MREV2, which a MotoIQ dyno showed adds 1 whp to a DE, though their dyno was admittedly conservative. And I'm unsure whether there'd be any gains from adding 3/16" to the 5/16" spacer. It does seem to me the majority of the gains are from the ported upper plenum.