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Discussion Starter #1
05 LOWER INTAKE PLENUM!

It is FINALLY In my hands! Goin on my car tomorrow!

It is Beautiful let me tell ya. The excitement I felt ripping open the box. I didnt even stop to pop any of the bubble wrap I was so excited!

And what do I see? Much larger volume of air in the lower intake manifold which means...

What the new Upper Plenums was doing, Nissan did it but to have even more volume in the intake plenum using the factory 05 Rev-UP Engine Lower Intake Plenum!

This will fit on 350Z Coupe / Roadster / G35 Sedan / COupe / FX35... With no modifications... Using the same bolts and gaskets... (I recomend replacing the lower and upper intake plenum gaskets with this...)

Enough babbling... here are the pix!

:icon4:













 

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Hmm, I wonder what kind of gains would be yeilded from swapping this out and having a plenum spacer. :biggrin:
 

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I just ordered the kinetix V5, would using the new lower plenum in conjuction with the modified upper plenum yield any noticable gains? This is of course assuming the two halves would be compatible.
 

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Jason, that's what I was thinking. More volume isn't always more power. I sure do wish we could get some flowbench testing done.:dunno:
 

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[/quote]

might be too much
<div align="right">[snapback]80058[/snapback]
[/quote]


Hi Jason,

Did the factory upper plenum change for the 05 model? Also, when do you you will be able to begin shipping the lowers?

Claude
 

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Is this a DIY?
 

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I have one of the 05' Lower Intake Plenums On order From Courtesy Nissan. I am going to have it either polished or Bead blasted to make it as smooth as glass. When it is all done and on the car, I will have it Dynoed, and post the graph so everybody can see if this will benefit the Z at all. I will be using the stock 03 upper Intake Plenum with it.
 

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[/quote]

Well, we could. All it takes is money. I'd be willing to do a flow-bench comparison: Stock, vs AAM spacer vs New OE lower plenum vs New OE lower plenum with AAM spacer vs Kinetics vs Crawford vs....

I just can't front that much coin to satisfy my curiosity. Anyone want to chip in, either money or loaner parts?
 

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I *may* be willing to offer my AAM spacer as soon as it gets here for the flowbench test.
 

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Discussion Starter #12
I had mine on order with NISSAN for almost 2 months... And I have a bunch more on back order... (since then too)...

I did a base line dyno today... Will be dyno'ing the lower plenum tomorrow , wednesday or thursday after i get it installed...

It is a DIY install...

We are going to be offering a Port / Polished verions of the Lower and Upper plenums....

This lower plenum is compatible with any upper intake plenum aftermarket upgrade... BUT, unsure (so far) if there will be any other gains...

Didnt the crawford plenum not gain as much when it was made larger in volume? in the earlier phases? i forget...

I dont see the lower intake plenum being that useful with any plenum spacer or upper plenum that change the angle of the stock plenum... I see this working best with an uper intake plenum that covers the same "slope" of the stock plenum... it will help get more air to the front cylinder's equally as much as the others if it is used with the stock plenum... if it is used with the latest plenums where the front is super high and the rear is low... this will make the front even bigger and the rear even smaller... not sure how it will work out... but we will see...


Here is info on my dyno today...

I just got back from dynoing my car... Well about a half hour ago... Had to do some paperwork when I got back :-/

Current performance mods on my car...

JWT Pop Charger (Stock Z Tube)
DC Sports Ceramic Headers (Stock Cats)
NISMO Cat Back Exhaust
UR Crank Pulley (blue)
TILTON Full Street Clutch

Also... 18x10.5" ENKEI NT03+M w/ Kumho Ecsta MX 295/35/18 Tires at 32PSI Cold (makes a difference on the dyno)


I compared it with a couple of other 350Z's dynos with simlar mods... I must say, I am impressed with my torque curve (if there is really much of one)...

I am a bit lean up to 4200... If I fix that my lower torque would be better as well as HP... I am very happy with where my car is now with my amount of performance mods...

I asked, the vinyl didnt help my HP :(

RWHP - 258.2
RWTQ - 237.4

And I drove WOT 32 miles under the CA sun. Put it on and did the pulls... So my car was pretty hot...

 

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So you gained 2 SAE corrected RWHP and lost 1 rwtq?

I hope that dyno comparison you, hydrazine, and roark are trying to set up comes through, i'd love to see the results!

Also, just wondering, why is the HP in the 400+? The TQ is right but the HP isn't.

BTW, that TQ curve looks NICE!
 

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Discussion Starter #14
[/quote]

The above DYNO Sheet is for my BASELINE!

I have NOT installed the Lower Intake plenum yet...

:doh:

The TORQUE numbers are on the RIGHT, the HORSE POWER numbers are on the LEFT...


RWHP - 258.2
RWTQ - 237.4


After I test the lower plenum and then the polished version I will do some tuning finally...
 

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Discussion Starter #15
[/quote]

Here I did a photo chop on my graph for you...

I changed it so the Torque and HP curves are scaled to the same chart...

it is not 100% accurate but if the chart was generated this way this is about how it would look... you get the idea...

 

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:doh: :doh: :banghead: :banghead: :headshake: :rolf2: :lmfao:

Sorry about that...had a brain fart I guess.

Looking forward to the results.
 

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Discussion Starter #18
So it was installed first thing this morning... :clap:




Innitial reaction = Gained up top where I figured it would. Felt some low end torque get taken away... Above 6000 RPM it really pushed me back into the seat...

I guessed it was about an 8RWHP Gain with little torque loss...

Drove down to the same dyno place... Same tank of gas... Drove the car the same 35 miles to the place at about the same speed / rpm...

Put it on the dyno and what did come of it?



The best pull from Yesturday (our baseline) was:

256.3RWHP / 238.2TQ


The best pull from today was:

263.6RWHP / 227.1TQ


BUT. The most important part was where the motor is now making its horse power...

Before the Peak HP was @ 6250 RPM. The Peak horse power is now moved up to 6700 RPM where my fuel cut off is. My next step is to raise up my rev limiter and tune it... I am running about half a point leaner with this new plenum install...

Keep in mind I have my stock cats on and DC SPort Headers. I took a big step back in TORQUE from installing those headers and putting my stock cats back on...

If I were to re-install my test pipes / high flow cats... I would more then re-gain the lost torque from this isntall plus gain more HP...



About half a year ago HFM put together a dyno day and tested his car before and after a crawford plenum. He was only able to get about 3-4 RWHP out of it. I dont remember what torque did...

But this gave a solid gain of 7.3RWHP without tuning ON a MODIFIED car...

Need to tune then do another dyno now :)

 

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I suppose that having a little extra oomph up top is nice if you need the edge on someone. :burnout:

I can't wait to install my upper plenum and see, feel, or hear what it does.
 
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