I don't usually read/post here and I can't search, so please excuse my lack of knowledge. I recall Ethan was going to try to swap a 350Z intake manifold to get more power for his 2k2. Does anyone know what happened with this situation? I'm trying to compare cars and see if the 2k2, 350Z, G35 Coupe, and G35 Sedan's intake manifolds are different.
-hype

 

I don't know the details but the 350z manifold project didn't work out. Some of us think that SR20DEN is working on a top secret intake manifold project but he won't come clean.

 

Well, if I remember correctly-from the obvious different orientation of the TB inlet on the Z's plenum; I think it was also too tall, and the hood wouldn't be able to close if you could even bolt it on.

 

Thanks for the details guys. I've been reading up on G35s and 350Zs, and I've been wondering if the 20 hp difference between the G35 Coupe and G35 Sedan was because of the intake manifold. The 350Z has a listed 7 more hp than the G35 Coupe, but thats likely other due to other differences.

No one seems to know why the G35C has 20 more hp than the G35S, so I was thinking it may just be the manifold. Obviously the hood clearance and TB shouldn't be an issue like it is on the Maxima.
-hype

 

Consensus here is, (as this has been discussed ad nauseum ) internally, they are all the same, but the G' and the Z not only has a better plenum, but also the addition of factory headers, whereas the Max/Alty' has a pretty restrictive Y-pipe section.

 

Check out the dynos for the 3.5 VQ with a Y-pipe. Not much power to be found there.

I think most of the power is in the intake manifold. The Maxi/Alti 3.5 VQ intake manifolds are variable and if you notice, the switchover point is at low 3800rpms. On the 00-01 VQ, the switchover was at a higher 5000rpms. Comparing the dyno of a 00-01 3.0 VQ vs that of the Maxi/Alti 3.5 VQ, you'll see that peak power of the 3.0 is at 6400rpms while the 3.5 VQ is at around 5700rpms and then power flatens out and begins to drop off hard around 6100rpms or so. A few 3.5 Maximas have shown power continuing on past 6000rpms, but it's rare. Simply put, I think Nissan tuned the Maxima/Altima 3.5 VQ to have a lower and broader power band. It probably has a lot to o with how much extra weight these cars can potentially haul around. The 00-01 3.0 VQ missed the target because the power couldn't compensate the 200lb weight gain.

The G35/350Z powercurve emulates the power curve of the 3.0 VQ while having a healthy increase in torque. Power is produced pretty much straight to redline. This suggests the G35/350Z manifold is far better at breathing after 5500rpms which is where they end up making most of their extra power. How Nissan was able to produce this sort of power band without a variable intake manifold is beyond me.


Dave

 

Oh, I understand that But, a Y-pipe is not a header, or rather the equivalent to the OEM ones on the G and Z

 

Interesting, I always thought that the 350Z/G35 had a VI. That is wierd that they are able to produce that much power w/out one

 

Back from the dead ...

Im speaking to a local gentlemen regardng his G IM, he doesn't want it anymore so ... hopefully I can get it for cheap ... I do see that Ethhan had hood clearance problems, but maybe there could be some lower IM modifications to accomodate.

 

uh-oh...watch out now....we got something cookin' here

 

It needs an intercooler....that's it....I bet my **** that's it......

 

I also think that Nissan detunes these cars with their design. Who's gonna buy a 350z if your grocery getter Altima can smoke it. If you notice, the Altima has just a little power disadvantage to our Maxima's, but has the same engine. Once again, I think it is another sales ploy. Same thing with Corvettes and Camaros (RIP), they both have the same motors, but the Corvettes had more HP, and a couple of minor differences. If they jammed our VQ powerplant into a Sentra, we'd all be up ****'s creek on the road racing against them.

 

Drunken pyscho.

 

I'm sobering up a wee bit now......only water and Advils for the last hour.... :attention

 

Hey guys, here's my opinion. ALL car based VQ35 engines are the same except for small changes in intake and exhaust plumbing AND computer tuning! It would cost Nissan a fortune to recertify each "version" of a VQ35 engine for emissions with changes in camshaft or cylinder head design. Therefore, each engine is "tuned" for it's desired traget audience. 350Z and G35C's get a higher rpm inatke AND exhaust design while Maxima's and (until the 298 hp '05 G35sedan) the G35 sedan got more low end grunt and less high RPM power. If you go to Technosquare's website, they have verified that the 02-03 Maxima 6-speed goes dead rich after 5000 rpm (10.5 Air/Fuel ratio) and the electronic throttle blades close by as much as 20%!! No matter how hard you push on the go pedal!!! Still think throttle by wire is a great thing?! Talk about restrictor plates for everyday!! No wonder noone makes power over 6000 rpm! Once these obstacles are corrected our Maxima's should make some decent power for a front wheel drive. Has anyone gone so far as to install some JWT cams, complete header and catback, and a JWT short ram and the proper ECU tuning required and then run it on a dyno?? I can't recall anyone going this far, at least that I know of.

 

The heads/cams are the same. Only difference is in the IM. The ECU may dictate cam adjustments but tehy (cams) are mechanically the same (part#)

Yes, we all know that.



The only major difference lies in the IM. But I still have a problem by going out and trying a whole new product swap (350Z IM --> Maxima) and still knowing that the same if not similar gains are possible from the a modified 2k2 Maxima unit ... Also, the Maxima IM is dual stage, ...the tricked out version is not and neither are the G/350Z's.


Mine doesn't go that rich I agree it could use some tuning but it doesn't go as rich as you stated, and the 2 runs where it did go rich is with the short ram (straight pipe between MAF and TB)


I'd like to see more facts on this with the auto max.

Yes, but they weren't installed correctly, and put down 249 whp with other mods, and there's another cam less max putting down 260+ with bolt ons some tuning and IM modifications .... The Altima that had the same JWT cams installed from Nissanperformance magazine did not show that bad of low end torque losses as PhxBlue did. But they still "only" showed ~260whp with pretty much all bolt ons ... Back to Phx, when he took apart his top end to install the stock units, he found that the JWT cams weren't installed correctly, not sure on the details but it had something to do with loose screws and VTC. So essentially we don't have true #'s on corectly installed cams, and when we know that 260 is possible w/o them, well, just makes the $1100 + PITA install not seem worth it to most pople.

People have done this too, and typically put down 230-240 hp, (regardless of tranny)

 

Anyone else have any worthwhile insight ...

 

Looks like the Altima guys are talking to Crawford about a possible match-up project ... http://www.nissanclub.com/forums/sh...95&page=1&pp=15

 

This is incorrect because the exhaust plumbing/routing is different as well as the intake track in front of the IM is different too.

Well if you know where the difference is then why don't you go out there and show the rest us idiots where it is? Have a Maxima intake flowed and have a 350z/G intake flowed and show us the difference. By the way the early (96-97)Cobra mustang 4 valve heads had a similar setup to our dual stage intake. The performance guys guys figured out that the most power was available with these removed, albeit with some low speed torque sacrafice.

Then call Technosquare and get them....My info about A/F ratio and throttle blade closing came right from their website!

Completely worthless information!!! If you don't have the cams installed properly in the first place then why bother even reporting on it???? If they were installed correctly maybe he would have shown the 15-20 hp improvement that the cam JWT states. And by the way, correctly means having them degreed, not just lining up dots on the sprocket and chain.

Why bother, apparently you have all the answers....

 

::subscribing:: just incase u guys do come up with something good

 

The exhaust manifolds are different part #'s as well as the intake manifold. We already know where the gains lie with headers because we have aftermarket support, but not with IM's. referencing part numbers helps eliminate factors that contribute to their gain over the FWD VQ, that's what I was trying to get at.


If i knew the answers I wouldn't be posting, I'm just stating what I know from searching ... And I don't have the money to be going out and buying IMs just for flow testing .. I'm jsut going by 350Z dynos ad comparing the curve to ours ... and the curve has a lot to do with the IM's since this is on of the very few parts that are different.




I have got to them and they just tell me that they used the same program as the 6spd, but couldnt not get consistent results on the dyno with the auto.



He did gain 12-15whp, but lost a lot of low end torque, unlike the Altima with the same cams as I do realize that cams do just that, shift the powerband, let's not get on a tangent about the cams, b/c this thread is about the IM. I was jsut stating the only instance by which the cams were tested on a FWD VQ35.



I'm not meaning to start a flame war, seems you got your panties in a ruffle over this... I was jsut posting what I know, and how it relates to what you have stated ...

 

O.K. my bad, I guess I was just reading into your comments too much.

I think there maybe some higher end power to unlock in our IM, but it may involve loosing some low end torque via the removal of the dual stage butterflies and then extrude honing the whole thing. Wether this sends a SES light, I don't know. However, I still don't think there is 20 or 30 hp tied up in the intake. 5-10, 15 maybe at a peak, IMHO. If you combine that with some head porting and larger valves and then through in the cams, now your talking 30-45 hp gains with a power band from 4000-7000 rpm.

Maybe SR20DEN will have the answer for us!

 

Maybe not much peak, but a big gain at redline would be nice jsut like the MEVI provided. SR20 will elt us know when he's ready but IIRC he didn't do any porting/polishng.

 

i'm hoping SR20 will start selling his IM soon....i'm definitely interested especially his stg2 IM...the gains are explosive and I really want to suprise the **** out of the locals over here....and I won't even tell them I have a modified intake manifold...just intake+exhaust

 

Another thing is if the crawfors Z idea sells, maybe we could bring it up to SSR's attention. Just use the Z concept but configure the TB inlet to fit the FWD configuration. And all that would need to be done is do away with the elbow and make it straight where the TB lines up, as well as some dimension refonfiguration... or am I missing something.

 

i'll have it soon here.....good thing i'm local

 

Well, your right that is pretty much it! The problem lies in the fact that it would require a manufacturing tooling change to the casting molds, which depending on the process used, could be anywhere from a few thousand dollars to a few 10's of thousands of dollars to change. Keep in mind this is for one product line of FWD vehicles. Where as the RWD has multiple lines that can use the same basic shape therefore spreading the cost out over many customers vs our relatively small customer base. I'm not saying it can't or won't be done, but it will probably take a dedicated effort (and money) to get them to do it.

 

He has been working on that "secret project" for a while now. Has anyone heard of any updates?

 

*subscribe*

 

We would all love that, but
we'll leave that subject alone in hopes for this not to get locked because and as I stated earlier, it'll come when it does.

As for Tommyboy, I see what you're saying, hopefully Crawford Z could help us out. Molding through casting or wrought(not likely) methods, or welding through cut or modified Z plenums.

Though there are multiple lines using this configuration (Murano/Altima/Maxima) as you stated in your first post, thes aren;t directed toward the enthusiast corwd ... but the SE-R maybe, but we're not going to keep hopes off of one model.

There are 3, maybe 4 possible companies that my show interest in this .

Crawford Z
Kinetix
Air power sysytems (APS)
And maybe SSR engineering

SSR would be my choice but they gave up on their original idea.

 

With the VQ3.5 having the VIAS, how is the engine/ECU/VIAS control module going to react to a IM that doesn't have one??? I'm sure there are some good gains to be had from a redesign of the VQ3.5's IM but no one has come up with a design yet... am I correct?

 

It's a simple pull of a plug as far as VIAS is concerned, and the fastest Maxima is running w/o it, so it's(VIAS) not a big deal. If you mean the FWD VQ35, then you're correct, but a far as VQ35's in general, well look on the last post of the previous page as there are 3 manufactres right now, maybe more that I've overlooked.

 

subscribing :-D

 

*UPDATE* Seems like they're gauging potential buyers in this new thead ...

http://www.nissanclub.com/forums/sho...=191981&page=4

 

subscribing, this is getting interesting

 

It is indeed .....

 

Subscribed here and in the AM forum too...

 

So if I disconnected the VIAS actuator and made it so the VIAS was open that would geve me some extra HP??? It would stand to reason that with it open all the time more air flow/more fuel/more HP.... but just wondering what your thoughts are on this. SR2ODEN better get busy on his secret IM before some of these o ther people beat him to it.

 

That's unlikely, there are a lot more hidden obstacles with the 350Z/G IM thatn most realize. Believe it or not, I think SR's is actually a better design, b/c it retains the Maxima manifold ... It will be a while until Crawford does this.

 

Cool.... any thoughts on my first question?