...okay, now I'm just bored and ponering things...lol...

Can anyone give me a brief idea of the effect might be of putting a fully functional S5 N/A intake manifold assembly on a turbo?

 

There are no aux ports on a Turbo, so what's the point?

 

oh yeah...

What about if the motor was rebuilt with NA irons?

 

then you have a 6port with no exhaust diffusers and.... wait, then you have a full turbo-swap 6 port. ... i think thats all.
on that note, what are the timing differences between the 4- and 6ports? i'm sure its somewhere, but you opened this thread.
and on the note, do the aux ports cause timing to open any earlier causing any extra overlap? asking as an emissions question.

 

Yah... You'd just have a turbo'd n/a block with TII rotors.

 

The turbo will no longer fit with the stock NA manifolds. Plus you'd have to fab up a water line for it, since the t2 LIM would no longer be there. Plus you'd have to do custom oil and water lines for the rest because of the change in turbo position. Plus...the exhaust...the intake...

<shakes head...>

 

So? Water and oil lines are easy to fab up. A 2" spacer for the turbo? Kiddy stuff.

Now, enough bullshit. Anyone got an answer for my question?

Turbo+VDI=?

I really don't give a rats *** if it's feasable, practical, "streetable", or if I'd have to defy the laws of physics to make it work.

 

Boy, you really like to start threads on "experimental" combinations.
Are you going to start blasting people to not reply if they don't have first-hand experience in here also?

Again, why don't you try and and report back to us with your findings?


-Ted

 

NA's with turbos slaped on have proven to make more power per psi boost then non ported t2's,.. so you'd probably have a decent combo,...with the more intake area/timming,.. i dont know if i'd keep the vdi though,.. the t2 manifold is pretty good,.. it's also alot more trouble then its worth,.. but if you wanna try it go ahead it will probably turn out well.

 

then yes. the question is how much money do you have.

 

^ WERD.


and to contribute to this thread....Technically, wouldn't mazda have done it this way if it would have been better for performance?? (i understand the implications of what i've just said...but, i don't know what im talking about anymore...goodnight.


+1 post.

 

SO you're going to come and start your **** here, too? Thanks......

Drago...re-read the thread.

Cafcwest..."yes" what?

 

That's like asking "Why wouldn't Mazda have used a larger wastegate port on the S4 housing if it was better?"

 

Longer manifold intake paths make for more low end power due to increase in intake velocity.
The problems with longer intake paths is that this works against you as RPM's go up.
Don't argue with me on this - this has been proven by engineers since the dawn of automotive engineering.

The NA intake manifold has very long intake paths compared to the turbo intake manifold.
The turbos adds to "cramming" air into the engine, so turbos engines - in general - shoot for shorter intake paths for better top end power; the turbo engine tries to rely on the turbo to make up for low end power.

The reason the NA motor + turbo makes just as much or more power than a non-ported turbo can be caused by the compression ratio of the rotors.
Zenki NA rotors are 9.4:1.
Zenki turbo rotors are 8.5:1.
That's a significant difference.

When we start to push power levels upward, I'm sure the Zenki NA intake manifold will show signs of significant restriction.


-Ted

 

I thought the VDI manifold has reletively short runners on the high side, and really long ones on the low...shorter on the high than the Zenki setup, and longer on the low than the Zenki setup...? Not sure of the comparative length between the 10AE runner lengths, but I was under the impression that the high side of the VDI intake was shorter.

 

The S5 VDI might have a shorter path, but I believe the intake passage cross-section is smaller than the any of the turbo intake manifolds.
Add the obstruction of the butterfly valve itself in the middle of the intake path, and it makes it that much more smaller.


-Ted

 

...might have a point.

Anyone know the stock runner diameter for either the S4 or S5 TII intake?