DIY: Z1 Intake Plenum and Spark Plug Swap [Picture Heavy]

synolimit

Isn't that what post 11 shows?

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13 370z-

Riptide67

Looks like MD is less Hp but more TQ.

I'm curious as to what other mods the car has and if this had any of the VV played with while tuning.

I originally decided the MD wasn't worth it. But the Z1 mani might be with the HP gains.

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2009 Nismo 370Z and 1975 Datsun 280Z 2+2 - PNW_INC - Legacy_Ohana
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synolimit

its z1 power mods, header, intake, cai, test pipes, cbe. not sure on tuning.

what gains? its showing power over the m370. we all know the stock mani makes more power over the m370 up top. your stock vs this modded stock mani should have the same numbers. however since the modded stock mani has close to the same tq numbers as the m370, itd seem you will gain a little mid range but thats all.

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13 370z-

Mozen

Sorry all, i should have chimed in sooner on this. All in all i wasnt sure i wanted to review it yet. When i got it i was rather dissapointed in the quality. 2/3ds of the sanding or porting done was rather rough and i ended up grabing some light sandpaper and smoothing it all down in the end. Whoever did the work also made a mistake and in the core i got there was a dollop of resin where they had sanded through a wall and needed to repair...which wouldent have bothered me if whoever did it had bothered to sand it all back down smooth. As it was it took about an hour to smooth all the rough spots out and clean it up a bit.

That all said its been on the car for some time now and ive logged just over 500 miles with a tune and love it. It is a gain although how much im not sure since my tunes are Etunes through Dynotronics.

Its hard to see in the picture below but on the left side where the throttle body meets the manifold there is a part that has a rough look. Its where the resin is. I can take a closer picture if needed to show it.

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PW 370z | AEM | MISHIMOTO | ARK PERFORMANCE | WHITELINE | NISMO | STILLEN | FORGESTAR | BC RACING | AMS | NON STOP TUNING | CARBONETICS LSD | 4 Point DOM 1.75" SCCA Spec Roll Bar + Harness Bar
CHECK OUT MY BUILD THREAD HERE

synolimit

Wow!

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13 370z-

shaun66

Sounds really shitty for 300 bucks

Z Stig

I have one at the house ready to put in. I was waiting for the garage to get above freezing! I think I'm just going to suck it up and install it before Thursday. I'll take a look at the workmanship on mine and report if it is rough or not.

Good writeup though! Thanks Mozen!

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SOLD: '10 Sport Touring, Black Cherry: Z1 Stuff, Stillen stuff, kWv3, SPC, UpRev & Pilot Super Sport.

Now: 2015 Jeep Cherokee Trailhawk for off-road fun, 2015 BMW 228ix for on-road fun

synolimit

Just saw a review on g37. It to looks rough and I saw some frays. You'll definitely need to smooth sand it.

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13 370z-

Spencer@Z1

We wanted to chime in on this since you guys have some concerns regarding the roughness and methods used to produce these plenums. We have put in a ton of hard work and dyno time testing many different configurations to find the best performing modification.
We have been doing this work locally for over a year we recently decided to make it a service available globally. Before we decided to do this we tested 8 different configurations with back to back testing on the dyno to refine the port work we do. Targeting the most consistent, and maximum gains based around our 400HP package.

For our dyno testing reference it is worth noting that when we perform these test back to back but we put a couple pulls in between the runs we show, because the car cools off when we swap the parts and it has to get back up to temp to make the same similar/equivalent power.
We have tested smooth and rough finishes on the same ported out plenum to see if any gains were to be had and no measurable distinction could be found however the difference in labor time was extensive, a smooth finish with no power to be had would come at a much higher cost. We already spend 3 hours per plenum removing extensive material from targeted locations and then work to refine the finish.

From a plenum to plenum standpoint we have found that there is quite some range in the accuracy of assembly. Having worked with many of these parts now it is not uncommon to see some where the two halves are put together accurately and the runner unions are reasonably smooth with not much overhang or "lip", while other plenums will have a distinctive shift or twist where they are assembled. So each plenum is worked by hand as needed some need only moderate matching and porting while others need quite a bit more labor. In the end they make great power and we are offering with an exchange service to keep the down time to a minimum.

Tuning cars with the mod has become weekly occurrence for us here and the P mod has never let us down.

Mozen

I'm away from home atm but I can take a pic of what bothered me when I get back. As I make clear tho I do like the gains.

Sent from my Nexus 7 using Tapatalk

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PW 370z | AEM | MISHIMOTO | ARK PERFORMANCE | WHITELINE | NISMO | STILLEN | FORGESTAR | BC RACING | AMS | NON STOP TUNING | CARBONETICS LSD | 4 Point DOM 1.75" SCCA Spec Roll Bar + Harness Bar
CHECK OUT MY BUILD THREAD HERE

Z Stig

I did look at mine when I got home, and think the workmanship is fine! No rough edges or bumps that are visible. The finish made it look a little dusty, but a quick wipe with a microfiber cloth revealed that it was the plastic's finish and not dust. My plenum was smooth enough that the microfiber did not stick. I'm looking forward to installing this over the weekend!

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SOLD: '10 Sport Touring, Black Cherry: Z1 Stuff, Stillen stuff, kWv3, SPC, UpRev & Pilot Super Sport.

Now: 2015 Jeep Cherokee Trailhawk for off-road fun, 2015 BMW 228ix for on-road fun

*ICE*

what is the purpose of changing the spark plugs too base on the first post? I thought it was just a simple swap for the plenum?

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synolimit

Just because he wanted to. I do mine every 40k. Some do 50k, some do 100k if they have iridiums.

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13 370z-

Mozen

Correct...I'm at nearly 50k miles and figured that since I had it all apart I should do the swap.

Sent from my Nexus 7 using Tapatalk

__________________
PW 370z | AEM | MISHIMOTO | ARK PERFORMANCE | WHITELINE | NISMO | STILLEN | FORGESTAR | BC RACING | AMS | NON STOP TUNING | CARBONETICS LSD | 4 Point DOM 1.75" SCCA Spec Roll Bar + Harness Bar
CHECK OUT MY BUILD THREAD HERE

Z Stig

Installed mine last Sunday. My throttle bodies had been cleaned about 5k miles ago, so I did not need to remove the coolant hoses. I just loosened the four bolts and moved them out of the way. I am getting a tune from Z1 to maximize my mods. Until then, I really noticed a difference in the drive with the plenum install. Very happy with it and looking forward to the tune!

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SOLD: '10 Sport Touring, Black Cherry: Z1 Stuff, Stillen stuff, kWv3, SPC, UpRev & Pilot Super Sport.

Now: 2015 Jeep Cherokee Trailhawk for off-road fun, 2015 BMW 228ix for on-road fun