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Discussion Starter #1
I see a couple of you guys took my advuce and have been visiting the Engine Mods forum of My350Z.com and found the new plastic injection molded Kinetix plenum. Rather than clutter up their thread with discussions pertaining to us, I figured I'd start a new one here.

First off, if you don't know what a plenum is or what it does, reference my Crawford plenum thread on FA: http://forums.freshalloy.com/ubbthreads/showflat.php?Cat=&Board=FX45&Number=67535030&fpart=&PHPSESSID=

As for the Kinetix: they're just now preparing to dyno test their first prototype, so it's a bit early for our consideration, as I like to let the Z guys pick it appart well before I consider it a viable mod for the FX. At any rate, I would only consider the Kinetix plenum over the Crawford if it proves to have better gains (we'll see; the dynos are supposed to be done tomorrow.) The downsides for us are the fact that the built in STB depression does us no good and only takes up valuable air flow space at the front of the plenum and the fact that the reat mounting holes for the engine cover are not present (though custom brackets could likely be fabricated to bolt up somewhere else). The wieght savings of the plastic plenum over the stock piece is negligible (the Crawford wieghs a little less than the stock one, also). The heat absorbtion theory is interesting, but again, the proof is in the dynos, so we'll see.

As for cost, it will likely be at least as much as the Crawford, which was recently reduced from $450 to $395. You do have to return your core or pay the $200 core charge to Crawford, but believe me, you'll never want your stock plenum again.

If you're a registered member of My350Z.com, you can follow the progress of the Kinetix plenum and keep up with current events here:http://www.my350z.com/forum/showthread.php?s=&threadid=59129 and here: http://www.my350z.com/forum/showthread.php?s=&threadid=58905 . Look for a new thread with the dyno results tomorrow or Thurs.
 

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Thanks MustGoFastR for your input. I've been lurking in all the G/Z sites looking for go fast products for the VQ for awhile. I was considering the Kinetix in the rare chance that I would want to keep my original plenum. However I agree with your assessment - since they've designed the plenum to keep the front strut of the Z and quite possibly alter the flow characteristics to the front 2 cylinders, I am back to considering the Crawford. I am also turned off by the fact that the Kinetix flexes under load. Crawford's V5 plenum looks great and much more refined looking than their previous ones. Looks like it is cast rather than a custom weld.
 

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Discussion Starter #3
ujmot said:
I agree with your assessment - since they've designed the plenum to keep the front strut of the Z and quite possibly alter the flow characteristics to the front 2 cylinders, I am back to considering the Crawford. I am also turned off by the fact that the Kinetix flexes under load. Crawford's V5 plenum looks great and much more refined looking than their previous ones. Looks like it is cast rather than a custom weld.
They've already mentioned that the production version will feature a fix for the flexing under load. As for the Crawford V5 plenum: yes, it does look much nicer than the original and I considered trading mine in for the new version ($195), but there really isn't much point. You don't see it under the engine cover and the FX's sound insulation is superior to the G and Z, so you don't really hear much of anything from it, either, though the new version is supposed to be at or near stock sound levels. Personally, I like to hear a bit of growl. As for it's construction: I'm not sure how they're doing it, but I don't think it's cast. They don't have that kind of equipement and still want the cores back.
 

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MustGoFastR said:
As for it's construction: I'm not sure how they're doing it, but I don't think it's cast. They don't have that kind of equipement and still want the cores back.
They got a decent pic on my350z of the inside of the new Crawford plenum. Looks like they cut along the edge of the top and welded a wedge in it to make it look stock from on top. Very nice work.
 

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Discussion Starter #6
Dynos for the Kinetix plenum are up: http://www.my350z.com/forum/showthread.php?s=&threadid=60378
Gains look very impressive and are throughout the entire power band. I'll wait until someone dynos it on an otherwise stock car, though before considering it over the Crawford. This guy also added the high flow cats and had existing mods, which may have affected gains. Read the entire thread; there are some SAE corrected RPM dynos posted a bit further in.
 

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Man, those numbers are seriously impressive. Wonder if the plenum would fit under our engine covers.
 

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Discussion Starter #8
ujmot said:
Wonder if the plenum would fit under our engine covers.
Well, there are no mounting holes for the rear bolts, so at the very least, some kind of brackets would need to be fabricated. The front of the plenum looks to be just as high as the Crawford, which causes the engine cover to bulge slightly so that you have to push it down onto the front mounting bolts and tighten them up.

Still no word on how much he's going to be charging for the Kinetix plenum and I still want to see how it dynos on a bone stock car (which a couple of Z owners have already said they will do as soon as they can get one). The dynos look very similar to Crawford's plenum/cat combo gains as they are; we'll have to wait to see if the plenum alone really does prduce gains accross the baord or if that is due to the cats or some of All_Bark's other mods. He's also running a bit lean through the middle rpms, so it looks like he'll need a customized ECM flash. Agian, this may be due to the combination of all of his mods.
 

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Well good news. I pm'ed Lsdunique and I will purchase one to test fit it on my FX. As MustGoFastR stated, the rear 2 bolts were taken out of the design since the Z's cover doesnt use them. I will attempt to create custom mounting brackets for the cover. More info/news to come once the plenum is ready for its production run. Hopefully, he will ship out a unit to me by sometime next week. :D

Tom
 

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ujmot said:
Well good news. I pm'ed Lsdunique and I will purchase one to test fit it on my FX. As MustGoFastR stated, the rear 2 bolts were taken out of the design since the Z's cover doesnt use them. I will attempt to create custom mounting brackets for the cover. More info/news to come once the plenum is ready for its production run. Hopefully, he will ship out a unit to me by sometime next week. :D

Tom
excellent!!

im sure you can fab. brackets from either al. or sheet metal.....

you know, :idea: im certain the guys at paddock performance could whip up threaded mounts WHILE you wait for the inatke to be finalized!!

that way you get nice oem threaded al. mounts!!

give em a shout!
 

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Discussion Starter #11
ujmot said:
Well good news. I pm'ed Lsdunique and I will purchase one to test fit it on my FX. As MustGoFastR stated, the rear 2 bolts were taken out of the design since the Z's cover doesnt use them. I will attempt to create custom mounting brackets for the cover. More info/news to come once the plenum is ready for its production run. Hopefully, he will ship out a unit to me by sometime next week. :D

Tom
What happened to jumping on the Stillen S/C? Remember a roots blower replaces the plenum completely, so you'd have to ditch it if you went that route; t6he FI references they are making regarding the plenum are for centrifrugal units and turbos. At any rate, I'd highly recommend waiting for a few other dynos before jumping on the bandwagon. There's already talk of a dyno day where the Kinetix and Crawford can be dyno tested on the same car, same dyno, same day.
 

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I realize that but there's no definitive release date on the Stillen kit yet. Alex told me about a month and promised to keep me updated.

Lsdunique offered me a discount and no questions asked return policy for me, so I really have nothing much to lose. If I dont like it, I got my stock plenum to put back and just return the plenum to him. If I like it, I keep both plenums until the SC is released - then I can sell the plenum to someone else.

:)
 

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ujmot said:
I realize that but there's no definitive release date on the Stillen kit yet. Alex told me about a month and promised to keep me updated.

Lsdunique offered me a discount and no questions asked return policy for me, so I really have nothing much to lose. If I dont like it, I got my stock plenum to put back and just return the plenum to him. If I like it, I keep both plenums until the SC is released - then I can sell the plenum to someone else.

:)
i like your thinking here.......

most (if not all) of these performance parts are a qucik re-sell.... even tho at a few bucks less, its still an almost certainity with a forum like this.....
 

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Discussion Starter #14
That's true. Mind giving at least a ball-park figure of the cost?
 

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Under 400 for sure. Not sure of the final cost yet however.
 

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I see on my350z.com that Kinetix has set a release date and price for their new plastic plenum. Below is from Kinetix's post:

ujmot what's the status of what you are doing with the Kinetix plenum?


Our initial group buy will be more of a sale, than a Group buy.

There will be no required order amounts, or payment collections.

orders can be placed starting February 22nd and the sale will last for a time period yet to be determined (2-4weeks)

Orders will be placed through our website, kinetixracing.com

The sale will begin when the plenum is placed on the website , Sunday morning

first batch of orders will be shipped out on Feb. 29th

After the sale, the price will go up to list price, 399.99

list price, plenum $399.99

***initial offering sale $359.99

high flow cats list $389.99

package price plenum/high flow cats $729.99

Thanks Everyone
 

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Unfortunately, I was running around all day today trying to get a billion things done (including driving up an hour away to Paddock to get measurements for the CAI). I just pm'ed him and am waiting to hear back from him. Hopefully he didnt forget about me as he seemed eager to help us FX'ers out. :)
 

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Got in contact with lsdunique. More info to come soon as we're still working out the details. Hopefully I can get one before his official launch so that I can fabricate a custom bracket for our engine covers.
 

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I got the mod fever. There's no cure except to sell the **** car (FAT CHANCE!!!)
 
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