I want to make a upper that will bolt to a 3.5 lower. I have some ideas ,IM leaning towards i design like the hondas have but Im thinking alitle shorter than that because the lower intake will still be there.

If you have pics or have a little knoledge in this area please give me some ideas.
Im thinking flange matching the lower maybe 350z lower or 03 max lower,with bent or straight plenums very short with the box welded to them. Kinda like honda design.

Im looking for 4000rpm+ power ,i dont car how much it takes below there .

 

How about something similar to this 350Z:

 

Or similar to SSRs RWD VQ35 manifold:

 

The older Ford Yamaha SHO intake manifolds were very nice.

 

This is probably as close to individual venturi TBs as you can get from Veilside for the Supras:

 

Someone should see if SSR's could possibly fit under our hood...from the pics it looks smaller than the stock 350z manifold.

 

Looking at this one i may weld air horns to a lower and weld a box on the ir horns ,make it one piece with lower. I notice the boxes seem to taper down even on the 00 vi it does that i wont be able to duplicate that.

 

Slap a TB on the one side and you're in business.

 

.

I bet the one on that orange car makes less power than the stock IM.

 

Look how short those airhorns are. And look at the applications of the IM pics you guys have. That Veilside IM is designed for boosted Supra engines running at over 800hp.

 

One would be better served looking at the M series BMW intake manifolds for na inspiration. IMHO anyway.

 

I was going to suggest the same thing.

 

Do those have VANOS?

Got pics I can see?

 

SSR is junk according to the 350z guys.....No significant gains for the 1g it costs

 

Wow for gen info:
http://www.metricmechanic.com/M3Engine.pdf

 

The 350Z/G35 intake manifolds are engineering works of art with some serious R&D to hit 100+% VE from 4000-6400rpm, even 105% at 5600rpm. So, somebody with a welder and some spare time on their hands isn't going to just magically create a better version.

Since we most likely can't fit a 350Z manifold under the hood, we probably can't fit the SSR manifold either, but maybe something similar that produces better then stock FWD manifolds could be found with some research/trial/error.

 

Jeff,

WTH, did that article have to do with intake manifold design?

HOWEVER, man what a fascinating read. I like the valve spring pressure vs. wear and intake port volume vs. TB volume tips. Makes me want to rip off the heads and send them out, but that's only if I stayed NA and would be worth it.

 

The 1st gen Yamaha SHO got 220hp from 3.0 liters and no VTCs. Short and long runners. Oh well...

 

VQ30DEK is 222hp(227hp) from 3L without VTCs.

J/K...I've always liked the turbo SHO with manual trans.

 

Ford did 220hp in what? 1990? We had what? 160hp? But yeah, the only thing good on those SHOs was the engine.

 

Well Ford didn't do it, Japanese Yamaha engineers did it....

 

Here's another good read, that also mentions the variable runner length technology in the BMW 7 series engine.

http://www.canadiandriver.com/articles/jk/020213.htm

 

Haha...VANOS man...that isn't going to happen on anything other then a BMW.

 

The Nissan CVTC is essentually the same thing as BMW VANOS. They're just setup a little differently. And the dual VANOS on the S54 uses 100bar oil pressure intead of engine oil pressure that the earlier VANOS uses.

 

VANOS wasn't the right term, BMW doesn't use a throttle plate and uses the height of the intake valves to control airflow plus on their newest cars(745i, 545i) the infinitely variable intake,

WAY way beyond what anyone here is going to ever care about copying in an intake manifold design.

 

the jim goughary built vq30 on nissanperformancemag.com is using a chopped maxima intake manifold with only the runners (4th gen USIM) bolted up to the lower IM and a custom welded manifold tube that tapers off to one side much like the veilside one.

He has individual throttle body's to that setup now with the 02+ chopped maxima manifold

 

hes a real nice guy, I have talked to him before in the past.

 

 

Porsche Cayenne also has variable length IM:http://content2.eu.porsche.com/prod/..._intake_system

 

Back to the topic at hand....NON-variable length manifolds, you guys.

 

So far, we've got

1)Myself posting highly boosted IMs, probably don't apply.
2)Jeff posting links to engine design, but no intake manifold info.
3)Stephen posting HIGHLY complex variable length intake manifold designs on NA cars.

Hell, well at least we're getting closer to krismax original question.

 

WTF? Didn't I just mention the SHO????????????????????? A varible type IS going to be the best na design.

So what are you looking for? The best non-varible design? Because that is a little different. And I did post a pic of the M3 na intake.

 

Why don't you look up specs on some of the fastest all motor cars and see what kind of intake manifolds they have.

 

You're right, except you didn't post anything on HOW the SHO IM is designed and that BMW pic is pretty non-descriptive since you can't even see all the runners or how it's laid out.

The best NON-COMPLEX, ie doable homemade manifold. I agree, it's not going to be the "best possible", however something that surpasses OEM with little top-end restriction to 8Krpm.

 

GOOD IDEA~!

 

Any non varible manifold is going to be a trade off. The sho one is "probably" the easiest of the complex ones to copy (if possible). Or just use a 2000 maxima manifold.

What do you want? low end or high end? Very difficult to have both with the engine arrangement/hood/non adjust type.

 

All current VANOS eqiuped BMW engines still have throttle bodies. This includes the E46 M3, E39 M5 and even the new E60 M5. The technology you speak of is called valvetronic and is used in the E65 760iL and all of the new 4.5 liter V8s (745, 545). It may also be used in the new E90 M3s.

 

So, you're saying the new 745i doesn't use VANOS?

 

The E65 745 does also have dual VANOS. So I should have said VANOS only BMWs still have throttle bodies. It is the valvetronic technology that negates the use of throttle bodies.

http://www.bmwusa.com/vehicles/7/745iSedan/features.htm

 

you get confused too easliy icey.....