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Plenum Spacer

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Old 05-14-2018, 06:29 PM
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kenval90
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Default Plenum Spacer

Which Plenum Spacer should I get for best gain results I noticed there are different sizes
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Old 05-14-2018, 07:28 PM
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Kevin Skene
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5/16 is good
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Old 05-15-2018, 05:23 AM
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Atreyu'z 350
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5/16 for more midrange torque and 1/2 for more top end torque.
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Old 05-15-2018, 05:55 AM
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It really depends on what school of thought you adhere to. There are those that believe a flat spacer is best as it keeps the same design of the plenum and there are those that believe an angled plenum spacer is better as it changes the curve of the manifold which forces more air to the front two cylinders. There are lots of discussions out there about these concepts. Depending on what you're reading, you will likely find somewhat biased reviews.

Personally, I run an angled spacer since I was keeping my OEM front STB at the time I bought it.
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Old 05-15-2018, 05:57 AM
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The Motordyne 5/16 spacer is pretty popular. It includes superior quality hardware and excellent instructions.

Keep in mind that you won’t see much gain until you get a tune.
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Old 05-15-2018, 07:06 AM
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Save for header/exhaust. I tried both (on a freshly built motor) all I saw was just a power shift but no addition, unless you can feel 3 - 4 hps difference on certain bands. Maybe my car is different than yours mine being a base model, but most bolt-ons I tried did not add anything. I got true gains on my header and str8 single exhaust. Even my K&N regular filter recorded more power than CAI (long or short) on the same dynopack I used before the built. just my cents
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Old 05-15-2018, 11:33 PM
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bad boyz
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The Motordyne 5/16 spacer is what most are using and Motordyne is a very good quality company with superior products,if you have the revup engine it is prerequisite to purchase the MREV2 lower manifold to see any gains which Motordyne offers as well. There website quotes the gains to be 15+hp and 18tq in the midrange if you have the non-rev I've been told the spacer by itself should be sufficient GL!!!
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Old 05-16-2018, 07:31 AM
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I also recommend the Motordyne 5/16 with the iso-thermal kit (I think it's called?). It includes a copper TB gasket and aramid lower plenum gasket that helps isolate the intake charge from the engines heat. Before installing I would stop after a long drive, and the top of the plenum would quickly become too hot to touch. After the install, the plenum stayed cool to the touch for ~20-30 seconds before it heat soaked. Also my butt dyno showed pretty significant gains on my rev-up, but I installed an MREV2 at the same time.
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Old 05-16-2018, 10:59 AM
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One other thing - If you are going to install it in an early 2003 you will have to drill and tap the strut bar bolt holes as the oem size is M8 and the hardware in the spacer kit is M10.

Last edited by tmdz; 05-16-2018 at 04:10 PM.
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Old 05-17-2018, 05:48 AM
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I had a spacer on my 03...and i ended up switching to the Kinetix Top Manifold cover.
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Old 05-17-2018, 09:24 AM
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Originally Posted by Dr. Venture View Post
I had a spacer on my 03...and i ended up switching to the Kinetix Top Manifold cover.


What size spacer did you have? Did you notice a difference in performance with the Kinetix over the spacer?
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Old 05-20-2018, 10:42 AM
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I JUST installed a 5/16” Motordyne spacer and it makes a definitely noticeable difference. People say “you can’t feel an extra 5-6 hp” - but that’s false. Can you feel the difference when you turn on the AC? I certainly can and that’s only a 5-6 hp loss. I’d guess the spacer adds back just about exactly the same HP as the AC takes away. So shut off the AC and feel that extra power. It changed the way my car shifts, how it sounds and most importantly it makes the car ~3 seconds faster on the “test track” I use to measure my car’s performance. It did require a bit of mucking with the strut bar to get the hood closed properly.
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Old 05-21-2018, 07:20 AM
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Originally Posted by kauai1800 View Post
I JUST installed a 5/16” Motordyne spacer and it makes a definitely noticeable difference. People say “you can’t feel an extra 5-6 hp” - but that’s false. Can you feel the difference when you turn on the AC? I certainly can and that’s only a 5-6 hp loss. I’d guess the spacer adds back just about exactly the same HP as the AC takes away. So shut off the AC and feel that extra power. It changed the way my car shifts, how it sounds and most importantly it makes the car ~3 seconds faster on the “test track” I use to measure my car’s performance. It did require a bit of mucking with the strut bar to get the hood closed properly.
Did you tune it after the spacer install?
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Old 05-21-2018, 11:55 AM
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kauai1800
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I meant to mention this - no tune was done. I just reset the ECU and it 'sees' the increased airflow just fine. There's no place on my island with a dyno so doing a tune isn't really an option.
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Old 05-21-2018, 12:21 PM
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SpartaEvolution
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Originally Posted by kauai1800 View Post
I meant to mention this - no tune was done. I just reset the ECU and it 'sees' the increased airflow just fine. There's no place on my island with a dyno so doing a tune isn't really an option.
I don't know about this forum, but there is a G35Driver sponsor who does e-tunes. Basically you tell him what mods you have and he creates a base tune, and sends it to you along with an UpRev cable/license. Then you plug the cable in along with a laptop, load in the new tune, drive around for a bit while recording A/F ratios and stuff. After a few pulls, you send him the results and he'll fine tune your maps based on that data. This way you can get a pretty accurate tune without needing to pay for dyno time (or in your case, pay for a dyno!). Feel free to PM me and I can send you the guys email. I'm planning on going this route once I have all the bolt-ons I want, though it's worth noting he will do free re-tunes for 1 year after purchase if you decide to change things up.
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Old 05-21-2018, 08:44 PM
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Yes I heard of this. Costs a bit though I think..around $900? Tuning a car here on Kauai is pretty silly anyway since the speed limit is 50 and there’s only 2 lane roads.
....says the guy who installed a plenum spacer....lol!
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Old 05-22-2018, 08:28 AM
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I think listing pricing is against forum policy, but it's quite a bit more affordable than you think. The tune also allows you to run WOT in first a second gear, whereas the OE maps don't allow 100% throttle, so it'll definitely help with low speed fun as well.
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Old 05-22-2018, 12:30 PM
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Originally Posted by Atreyu'z 350 View Post
What size spacer did you have? Did you notice a difference in performance with the Kinetix over the spacer?
i had the Skunk spacer @ 1st. sucked because it made the mani way to high for the bar and it touched my hood. So i got rid of it and went with the Kinetix and i did see some improvements, but nothing crazy.
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