350z / G35 Plenum Spacer Review 

The computer tries to adjust as much as it can within fsctory parameters. Generally catback exhaust doesn’t require a retune, but test pipes start to push past what the ecu is used to. Same with CAI. The car (3.7) doesn’t starve for fuel either, even when tuning so larger injectors won’t add any value unless going flex fuel/e85 where larger volume is required. Obviously in boosted cars you can potentially run into fueling issues, but I’m not certain off the top of my head where that line is.

Great question! I too have the spacer and feel the difference as well. Though that question did cross my mind. I am looking into a performance mass air flow sensor to see if it helps read the extra air volume. The Jet 69138 maf or the UpRev maf sensor by Z1 motorsports.

@@velox731so is it ok to just put the spacer on and do nothing else?

Yes, you will feel a difference. Though, you may have to do an idle relearn for the ecu to adapt to the extra air coming in.

Plenum spacers don't change anything relevant... There's no true effect so why would the ecu have an issue? Naturally aspirated motors will only pull as much air as can fit in the cylinder...spacing the plenum only has one singular effect, miniscule lower temperatures

If you don’t ever push the car. I wouldn’t even bother. But if you want a little more throttle response and a little more pep, then it’s a simple and relatively inexpensive upgrade.

Not all all. It’s engine paint, but besides that, paint won’t really hinder heat dissipation

I polished mine looks like chrome but not worth all the time and trouble

It looks like it’s 1/2

As I said in the video

I mean bro was just cruising there not on throttle at all.

I was clearly coasting at that point and they were already at interstate speeds...good try tho lol

@@SpeedCultureStudios haha im just goofing around. Good video! i ended up getting a spacer based on your review :)

@@Cdawgstraightupposted awesome! One of the few mods that actually seems to make a difference

It’s not a bad upgrade as long as you have the other mods done too-intake and exhaust. And yes, you’d want a tune to get any benefit from it

@@SpeedCultureStudioshow do you get a tune

@@gunnerv12 you find a tuner that specializes in these engines

Worth it!

Dear Sir/Madam, did you install a 5/16 plenum or a 5/8 plenum and did it interfere with closing the engine cover. Greetings Vladimir

@@vladimirbenac7626 It is the 5/16" spacer from z1. No issues closing the hood.

​@@SpeedCultureStudiosabra problema de cerrar con el de 1/2 ?

That is one video I have not done

I could see higher volume injectors needing a tune unless the injection rate is deminimus once you add better air flow.

​@@SpeedCultureStudios what is your opinion that the new Z is a Q with no back seat and a mark up?

@@MrTilbin unique interior styling, LSD and manual - and different auto trans-it’s a different car than the Q in my opinion.

No way you cut almost 1 second off 1/4 mile with a spacer

I would imagine impact is minimal. It basically just evens flow to all intake runners. It would be interesting to see pressure change at various points

@@SpeedCultureStudios Did you need a tune or a flash at all for yours?? I think I might buy it.

@@user-ws3sl9xi7y no tune needed

No spacers on the strut bar until I put the plenum spacer on then I no longer used the strut bar

@@SpeedCultureStudios no check engine light after installing Im pretty sure you disconnect the battery to reset it but no check engine light ?

@@angelisalive I may not have even disconnected the battery to install -- if it wasn't in the video, I didn't do it. Never got a CEL after install either.

@@SpeedCultureStudios everything worked out no cel thanks for the video !!!

Yes

Wasted? Lol Engine temps weren’t a concern. If this was an “I installed a manifold spacer to get engine block temps down” then sure it would have been pointless-but that’s not why the mod was done, nor would it really have any impact of the temp of the block. What’s your point