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

Mozen · 02-22-2014, 01:55 PM

Ok all i know most of this is rather basic but i thought id create a DIY anyways.

First off you will need to remove the brace bar (Yellow boxes) and then the Cover (blue circles)

.

Next you will need to remove the connectors off the back side of the plenum, there should be 4 small bolts back there. Then remove the sensor on the upper right corner. After that is done pull and remove all the hoses on the back and the two in the front. (Light blue circles)

After that you will need to remove the main bolts that hold the plenum down. (yellow box)

Then you will need to disconnect your upper intake from the throttle bodies. (green circle)

Once all that is done you need to clamp the two coolant lines on each throttle body and then remove the 4 bolts and 4 washers that hold the throttle bodies on to the plenum.

Once both throttle bodies are disconnected, remove the clamped lines and take the throttle bodies out to clean them. You will have some buildup and since they are off now you might as well clean them up.

Now that everything is disconnected remove your plenum and set it next to the new one. You will need to transfer over both throttle body gaskets and the primary gasket on the bottom. You will also need an E6 socket to move over both upper studs. Once this is all complete you can move onto the spark plugs.

With the throttle bodies and plenum out of the way, changing your spark plugs is a breeze. You can see one of the coil packs on the engine and my wrench pulling another out. Each coil pack is held down by a small bolt. Remove the bolt, disconnect the electrical connector and pull the coil pack out of the way. Then take a spark plug socket on an extension and remove the spark plugs. Reverse the order to put the new ones in and Tq your new spark plugs to 25nm to call it a day. . NOTE. ONLY DO ONE AT A TIME TO AVOID MIXING THINGS UP!!

Once spark plugs are all done, reconnect the coolant lines to your now clean throttle bodies and set them on the sides out of the way.

Put the new Plenum on the engine and re-install the 4 bolts on each throttle body to secure them back to it. Then install the 6 primary bolts and 2 nuts to hold the plenum down to the engine.

Once the throttle bodies and plenum are secure you need to reattach the lines on the back and front and re-secure the intakes to the throttle bodies.

Once that is done put the strut bar and engine cover back on and you are done!

If you liked this DIY toss me some rep or a comment on my profile page! If you have questions hit me up in a PM and ill do my best to answer promptly!

RICAN · 02-23-2014, 08:14 AM

how are the power gain with the new manifold?..do you have a tune ?

7speed · 02-25-2014, 06:42 PM

Quote:

Originally Posted by RICAN

how are the power gain with the new manifold?..do you have a tune ?

This ......How's car running

Fantastic Z · 02-23-2014, 09:22 AM

Nice write up man!

I'd be VERY interested to see the internal design of the Z1 plenum to see what's going on and what was really changed in comparison to stock. I know that it IS an improvement over stock but, how so is my question.

black_sedan · 02-25-2014, 02:48 PM

Did you take any pics of the z1 manifold prior to install? Im curious to see what was modded.

Also, did you need to do a recalibration when the throttle bodies were removed?

Nice work!

synolimit · 02-26-2014, 12:26 AM

Quote:

Originally Posted by black_sedan

Did you take any pics of the z1 manifold prior to install? Im curious to see what was modded.

Also, did you need to do a recalibration when the throttle bodies were removed?

Nice work!

Just porting...

Jordo! · 02-25-2014, 04:19 PM

Did I see they picked up 10 whp from a just a pnp of the plenum???

That's pretty good -- under $300 aint bad either I will have to think about getting this...

black_sedan · 02-25-2014, 04:37 PM

Plus the core charge... Another $250.

Quote:

Originally Posted by Jordo!

Did I see they picked up 10 whp from a just a pnp of the plenum???

That's pretty good -- under $300 aint bad either I will have to think about getting this...

chuckie311 · 02-25-2014, 06:04 PM

Quote:

Originally Posted by black_sedan

Plus the core charge... Another $250.

Core charge is only if you are having them mail out the Z1 Plenum first..
they will refund you the 250 once they receive yours..

synolimit · 02-26-2014, 12:31 AM

Quote:

Originally Posted by Jordo!

Did I see they picked up 10 whp from a just a pnp of the plenum???

That's pretty good -- under $300 aint bad either I will have to think about getting this...

Maybe. This dyno says its 8-9hp over the m370 mani which we all know loses power over the stock mani top end. Whats it vs just a normal mani though??? The graph looks like it keeps up with the m370 mid range power but the top end should be no different than the stock mani. We need a back to back. Far as I can tell its cheaper than the m370, you gain "almost" as much mid range as the m370, yet you keep your top end as if you kept the stock mani. All in all seems worth it. I think though $300 is a little to much. A local shop or you could knock this out with a drill and the right bits/sand paper bits.

Jordo! · 03-16-2014, 02:02 PM

Quote:

Originally Posted by synolimit

Maybe. This dyno says its 8-9hp over the m370 mani which we all know loses power over the stock mani top end. Whats it vs just a normal mani though??? The graph looks like it keeps up with the m370 mid range power but the top end should be no different than the stock mani. We need a back to back. Far as I can tell its cheaper than the m370, you gain "almost" as much mid range as the m370, yet you keep your top end as if you kept the stock mani. All in all seems worth it. I think though $300 is a little to much. A local shop or you could knock this out with a drill and the right bits/sand paper bits.

Oh, really??? I didn't catch that this wasn't a comparison to the OEM IM -- then I don't know what to make of it.

It could be anywhere from 3 -5 over OEM then. Maybe. If that's the case, then yeah, $300 is a bit steep, and doing on the cheap by DIY/local shop who knows what they're doing would be the only way to make it even worth the trouble.

No comparisons of that floating around?

1cleanZ · 12-10-2014, 08:33 AM

Quote:

Originally Posted by synolimit

Maybe. This dyno says its 8-9hp over the m370 mani which we all know loses power over the stock mani top end. Whats it vs just a normal mani though??? The graph looks like it keeps up with the m370 mid range power but the top end should be no different than the stock mani. We need a back to back. Far as I can tell its cheaper than the m370, you gain "almost" as much mid range as the m370, yet you keep your top end as if you kept the stock mani. All in all seems worth it. I think though $300 is a little to much. A local shop or you could knock this out with a drill and the right bits/sand paper bits.

Can you explain both of these statements??? Between 4500-5k RPMs, where the M370 is known for its low end tq gains, the Z1 manifold is clearly almost 10whp AND ft/lbs of TQ lower!!???

Its all going to come down to opinions of "which is better" because different people have different wants out of the manifold(top end whp, or lowend midrange TQ). The Z1 Manifold has some clear gains up top over the M370, but are those truly "gains" when comparing to the M370, or just avoiding losing top end AND losing low end vs the M370.

The Z1 needs to be compared vs the OEM manifold, not the M370 to get true gains vs OEM.

synolimit · 12-10-2014, 09:50 AM

Quote:

Originally Posted by 1cleanZ

Can you explain both of these statements??? Between 4500-5k RPMs, where the M370 is known for its low end tq gains, the Z1 manifold is clearly almost 10whp AND ft/lbs of TQ lower!!???

Its all going to come down to opinions of "which is better" because different people have different wants out of the manifold(top end whp, or lowend midrange TQ). The Z1 Manifold has some clear gains up top over the M370, but are those truly "gains" when comparing to the M370, or just avoiding losing top end AND losing low end vs the M370.

The Z1 needs to be compared vs the OEM manifold, not the M370 to get true gains vs OEM.

That's only 500rpm and probably a MAF spike. You wont be able to feel that or compare it cause look at 4000-4500rpm. It says the OEM made the opposite vs 4500-5000rpm. Hence why run 7 and run 12 both make the same TQ.

I wouldn't say it's clear, what else was done? Do we believe this with no other data? I hate peoples belief sometimes in a big company that what's put down on paper must be 100% true.

I did this already but I compared the OEM mani vs a ported upper, lower and ported throttle bodies. Theres a reason they won't show you OEM vs just a ported upper (1-2hp maybe). My testings not complete though. We will redo this soon with this cars cats remove.

John@Z1 · 12-11-2014, 09:59 AM

Quote:

Originally Posted by synolimit

That's only 500rpm and probably a MAF spike. You wont be able to feel that or compare it cause look at 4000-4500rpm. It says the OEM made the opposite vs 4500-5000rpm. Hence why run 7 and run 12 both make the same TQ.

I wouldn't say it's clear, what else was done? Do we believe this with no other data? I hate peoples belief sometimes in a big company that what's put down on paper must be 100% true.

I did this already but I compared the OEM mani vs a ported upper, lower and ported throttle bodies. Theres a reason they won't show you OEM vs just a ported upper (1-2hp maybe). My testings not complete though. We will redo this soon with this cars cats remove.

Way to plug yourself again. I see you on every Z1 plenum thread, after you purchased our plenum to see how far you could port your own. Must be a nice coat tail ride. Since you are now a sponsor please try to carry yourself a little better. We expect more out of The370Z.com sponsors.

To answer 1cleanZ. I tell all that the Motordyne is better for low end while the Z1 is better on topend. We spend more time on the top of the graph at the track and on mountain runs.

Wiggins3377 · 02-25-2014, 11:15 PM

Great write up. I've been wanting to do this.

02-22-2014, 01:55 PM	#1 (permalink)
Mozen Track Member Join Date: Jun 2010 Location: Newport News, VA Posts: 820 Drives: Nissan 370z PW M6 Rep Power: 18	DIY: Z1 Intake Plenum and Spark Plug Swap [Picture Heavy] Ok all i know most of this is rather basic but i thought id create a DIY anyways. First off you will need to remove the brace bar (Yellow boxes) and then the Cover (blue circles) . Next you will need to remove the connectors off the back side of the plenum, there should be 4 small bolts back there. Then remove the sensor on the upper right corner. After that is done pull and remove all the hoses on the back and the two in the front. (Light blue circles) After that you will need to remove the main bolts that hold the plenum down. (yellow box) Then you will need to disconnect your upper intake from the throttle bodies. (green circle) Once all that is done you need to clamp the two coolant lines on each throttle body and then remove the 4 bolts and 4 washers that hold the throttle bodies on to the plenum. Once both throttle bodies are disconnected, remove the clamped lines and take the throttle bodies out to clean them. You will have some buildup and since they are off now you might as well clean them up. Now that everything is disconnected remove your plenum and set it next to the new one. You will need to transfer over both throttle body gaskets and the primary gasket on the bottom. You will also need an E6 socket to move over both upper studs. Once this is all complete you can move onto the spark plugs. With the throttle bodies and plenum out of the way, changing your spark plugs is a breeze. You can see one of the coil packs on the engine and my wrench pulling another out. Each coil pack is held down by a small bolt. Remove the bolt, disconnect the electrical connector and pull the coil pack out of the way. Then take a spark plug socket on an extension and remove the spark plugs. Reverse the order to put the new ones in and Tq your new spark plugs to 25nm to call it a day. . NOTE. ONLY DO ONE AT A TIME TO AVOID MIXING THINGS UP!! Once spark plugs are all done, reconnect the coolant lines to your now clean throttle bodies and set them on the sides out of the way. Put the new Plenum on the engine and re-install the 4 bolts on each throttle body to secure them back to it. Then install the 6 primary bolts and 2 nuts to hold the plenum down to the engine. Once the throttle bodies and plenum are secure you need to reattach the lines on the back and front and re-secure the intakes to the throttle bodies. Once that is done put the strut bar and engine cover back on and you are done! If you liked this DIY toss me some rep or a comment on my profile page! If you have questions hit me up in a PM and ill do my best to answer promptly! Whtfairladyz, ICE, David Parra and 14 others like this. __________________ 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

02-23-2014, 09:22 AM	#4 (permalink)
Fantastic Z Base Member Join Date: Sep 2013 Location: Nashville, TN Age: 35 Posts: 197 Drives: 10' T/S 7AT Rep Power: 12	Nice write up man! I'd be VERY interested to see the internal design of the Z1 plenum to see what's going on and what was really changed in comparison to stock. I know that it IS an improvement over stock but, how so is my question. scionide and wsarver like this. __________________ Rays GramLights 57Fxx BM w/red centers-Michelin Pilot Sport tires-Motordyne CBE-Nismo red calipers-Z1 (SS lines/Slotted rotors)-Motul fluids-Whiteline diff bushings-Redline fluids-JDM fog lamp-GTR start button-Optima Yellow Top-EVO-R B pillars-Custom GPS mount

02-25-2014, 04:19 PM	#7 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Did I see they picked up 10 whp from a just a pnp of the plenum??? That's pretty good -- under $300 aint bad either I will have to think about getting this... carlitos_370z likes this. __________________ Enjoy it. Destroy it.

02-25-2014, 11:15 PM	#15 (permalink)
Wiggins3377 A True Z Fanatic Join Date: Jul 2011 Location: Cincinnati Posts: 3,236 Drives: 40th 370 Rep Power: 77	Great write up. I've been wanting to do this. __________________ AccuAir/ AirRex/ Amuse/ Bride Japan/ Carbon Fiber Element/ Carbon Signal/ Evo-R/ NRG/ Project Kics/ Samco/ Shine Auto/ SPC/ SPL/ Stance/ Stillen/ Takata/ Top Secret/ Work

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02-23-2014, 08:14 AM	#2 (permalink)
RICAN Enthusiast Member Join Date: Jan 2013 Location: fort hood, tx Posts: 345 Drives: 2012 370z m6 Rep Power: 13	how are the power gain with the new manifold?..do you have a tune ?

02-25-2014, 02:48 PM	#5 (permalink)
black_sedan Enthusiast Member Join Date: Dec 2011 Location: Florida Posts: 308 Drives: 14' F150, 14' Q50 Rep Power: 14	Did you take any pics of the z1 manifold prior to install? Im curious to see what was modded. Also, did you need to do a recalibration when the throttle bodies were removed? Nice work!