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The mkiv Supra Owners Club

New N/a manifold???


nevins

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Just been having a look around sites while trying to find some poly bush kits and stumbled across this.

 

It looks pretty but can't help but think why someone would go and spend this amount of money for this manifold. Also when looking at the reviews a guy says he fitted it to his N/A /T. Just thought I would share it with you.

 

http://www.titanmotorsports.com/viwonoinmati.html

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I suppose it makes sense on an NA-T when you dont need the variable intake manifold and you want the TT-like intake routing. It would be pointless on an NA.

 

Exactly what I thought.

 

A turbo'd engine will have a higher intake pressure than an n/a so the n/a will struggle to supply each cylinder effectively, to accommodate this manifold .

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A turbo'd engine will have a higher intake pressure than an n/a so the n/a will struggle to supply each cylinder effectively, to accommodate this manifold .

 

It doesn't work like that.

 

You can put as big a plenum / manifold as you want on an NA engine. In fact the bigger the better but beyond a certain point the extra volume gets you smaller and smaller gains and packaging becomes an issue, so there is a practical limit to how big you want to go. Also, if you run a lot of valve overlap then at low speeds / loads you can fill up your intake system with exhaust gas which causes drivability issues. This is why very high performance NA engines for road cars sometimes have port throttles.

 

Its far more important to tune the intake runners on an NA engine, which is precisely where this one falls down. It bins the twin-length variable setup that the stock NA has in favour of short stubby runners which will only be good for high engine speeds (what speed that is I have no idea).

 

I think that this is really aimed at the NA-T market, but the website isn't specific enough and I get the feeling that they might want NA owners to buy them as well...

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It doesn't work like that.

 

You can put as big a plenum / manifold as you want on an NA engine. In fact the bigger the better but beyond a certain point the extra volume gets you smaller and smaller gains and packaging becomes an issue, so there is a practical limit to how big you want to go. Also, if you run a lot of valve overlap then at low speeds / loads you can fill up your intake system with exhaust gas which causes drivability issues. This is why very high performance NA engines for road cars sometimes have port throttles.

 

Its far more important to tune the intake runners on an NA engine, which is precisely where this one falls down. It bins the twin-length variable setup that the stock NA has in favour of short stubby runners which will only be good for high engine speeds (what speed that is I have no idea).

 

I think that this is really aimed at the NA-T market, but the website isn't specific enough and I get the feeling that they might want NA owners to buy them as well...

 

Thanks for clearing that up, I now understand the intake that bit more :thumbs:

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