WOW i just installed the z tube into my car and it sounds amazing.. It was a PITA to make fit right though

 

excuse the ignorance, but whats the z tube??

 

Nice! I've been thinking of this too. How much did the sound change? Any pics?

 

Yeah, pics please.

 

I dunno what the "Z tube" is???

 

would this be it?




link

 

is this like a berk intake?

 

It's basically a 75$ noise maker...

Interesting.. not.

 

Actually, it's not.

G35 guys have seen 6-7whp(IIRC) from switching to the Z tube.

 

However, I'd say any midpipe, INJEN, or PR CAI would produce the same results.

I'd just like to see how he integrated this with his MAF and whether it straights the air more/less.

 

but what is this thing, and what's it look like???

 

That seems too much. Not from that little of a pipe anyway. What else have they changed in terms of intake components?

But, if it gives 6hp on a maxima (not a G35...) I'll go get one myself. Though I can pretty much bet my pink slip you won't see any dyno difference.

 

Can't argue with dynos.

It's one of the few differences between the Z and G. The G has a small "book" airbox and this eliminates that.

 

http://www.courtesyparts.com/Merchan...de=16576-Z3303

It connects the MAF to TB without an BS restrictions/bends. I highly doubt this makes anything over any intake w/midpipe.

 

Here's some pics of the G35 tube that this replaces and why *THEY* see 6-7whp IIRC:

 

My exact sentiments.. I just see it giving no benefits on a maxima hence me calling it a noise maker..

That box almost looks like a mini resonator to keep things quiet.

 

Until he posts pics to see how/what it changed...you don't know. I never said it would give a Max the same results. There could be something to gain, however just the cleaner e-bay with OEM MAF protection makes it more then just a "$75 noise maker".

Here is a good summary of what the G-to-Z tube w/POP looks like:
http://www.performancenissanparts.co...ide/g35pz.html

 

The Z-tube with a POP charger could be the ticket to reducing the MAF failures with rigid aftermarket intakes.

 

That is a Helmholtz resonator on the G35 which is the same thing that's on the 5th intake piping. My 4th gen has a huge resonator (much larger than the Gs) and my car drives immensely better around town with the resonator in place. The resonator serves two functions:

1) quiet intake noise
2) improve throttle response in the low to midrange by tuning intake resonance

I've tested my PR CAI at the track on the same day with the OEM resonator and then with the PR-supplied "midpipe" or straight pipe. Like EvilRoad's said, a straight pipe is basically a noise maker and it also takes away from some lowend driveability making the VQ feel a bit hesitant. At the track there was absolutely no difference in ET and MPH actually favored the resonator slightly.

As for the G35 guys showing 6-7rwhp gained, it's not true. I've never seen one dyno to support that claim other than one guy who tested his G35 sedan on two different types of dynos with the only mod being the Z-tube and he saw a 6whp difference for like 300rpms. Two different types of dynos = BS data. Same dyno everytime is mandatory.

 

Could be totally wrong on this one but didn't mafs with intakes fail because of the extra dirt and/or people putting too much oil/mishandling the sensors? Just air shouldn't hurt a MAF. After all, it needs to sense the extra air to really change the mixture in the engine.

 

Cattman also dyno'd this with the JWT POP filter on his G.

I'll have to see what he got.

 

Also....per "3rd gen High Respons and High Output 3.5L V6 Engine", ie VQ35 SAE technical doc that "straight duct" IMPROVES AIRFLOW BY 20% vs. Pathy VQ35 V6.

http://edit.imagestation.com/pixami/...=1088194490668

http://www.imagestation.com/mypictur...&caption=ztube

http://www.imagestation.com/mypictur...caption=ztube3

 

Any comments Dave?

 

Well off on vacation for a week...I'll try and check back.

 

ill have pics up soon other intakes may do the same buy i have my stillen cone filter up near the front of the car not to the side its right where the air scoop was before

 

Looks great on paper, but there still isn't a verified dyno out there yet supporting the Z-tube either. BTW, the Z-tube is just a Nissan "midpipe". I can see that in the figure the straight duct flows more air, but is this a Nissan paper or some other paper? The reason I ask is because these resonators are tuned to work with the intake resonance of the intake manifold and create a smooth pulse of air in relation to the intake stroke. A straight pipe will always outflow a pipe that has cavity (resonator), but when you add a motor into the equation, the all out flow may not be the answer.

I could be completely wrong about all this because I don't own a G35/350Z/5th gen Maxima, but I do know that on my 4th gen, the huge resonator that sits between the throttle body and MAF does serve a purpose in normal day to day driveability. At the track, I ran 14.4@98mph with the resonator and 14.4@98mph without the resonator. Same day, same 60 foots.

Here's a dyno comparison of a few G35s tested with various mods, most importantly the Z tube. The stock 6 speed G35 is making basically the same power (within 1hp) as the 6 speed G35s that were running the Z-tube or Injen intake (uses a midpipe). Granted these were different cars being tested, but the numbers are amazingly close in terms of peak numbers and the rpms where the peaks occured.

http://g35driver.com/forums/showflat...sed&sb=5&part=

 

i may give this a shot, in attempt to regain some low-end throttle response. my bro's Z has the jwt pop and doesn't seem to exhibit any hesitation