NA VS Turbo Manifold WOW!

[PorterzSupra]

Okay this just came to me, I could be wrong but just think about this for a second. The turbo manifold has a 2.5 inch inlet after the TB. The NA manifold has two 2 inch inlets after the TB. So if the turbo man has a 2.5 inch inlet and the NA has a total of a 4 inch inlet wouldent the NA manifold flow more air with less resistance especially under a boost situation!!?? :icon_razz

You can even retain the stock turbo TB as it bolts up to the Y tube going into the NA manifold!!!

 

[Yellow 13]

Between the two ports on the N/A mani is a door that opens and closes. Asicis or something like that.

 

[Nick M]

ACIS= Acoustic controlled induction system. We have the first generation of it. It wasn't even called that back then. Ours is the pioneer.

The reason it won't matter is you are still going through the same size throttle body. I am guessing some of the Supra "pioneers" have already tried it, I know one that did. He didn't get a gain, but the ACIS wasn't working right either he said.

If you could get the vacuum system to work with boost, you would have a big boost in midrage torque with control of the valve.

 

[PorterzSupra]

With the ACIS hooked up or not you will still get better flow into the manifold. The TB would be the last thing holding it back but even with that bottleneck you should still get better flow. Its like when you do a catback exhaust even though you still have a bottelneck you still get more power because its one less restrictive piece! With the ACIS unhooked it will function as the turbo manifold just with a larger entry path

 

[PorterzSupra]

BTW, is the ACIS valve suppose to be open at WOT and closed at mid? I noticed under 0 vacume the valve is open fully acting like a turbo manifold would.

 

[PorterzSupra]

more feedback please?

 

[hottscennessey]

feedback.. I dont think that it would make much if any of a difference. Besides, the N/a manifold is ugly IMHO.

 

[yankiwi]

I've tried both, I prefer the turbo mani as it is less crap over the engine.

The throttle body size is very similar on both so I don't think there is a big flow difference, if any.

Also remember that 2 x 2in holes are not the same as a 4 in hole for flow purposes.

pi x radius/squared = area

3.1415 x 1/sq = 3.14 square inches area - 2inch hole's area

3.1415 x 1.25/sq = 4.9 square inches area - 2.5 inch hole's area

3.1415 x 2/sq = 12.6 square inches area - 4inch hole's area

So an actual 4inch throttle body will flow about twice as much as two 2inch throttle bodies.

All rough math but you get the point:biglaugh:

Disclaimer, its early and my coffee hasn't kicked in. If this is wrong sue me!

 

[PorterzSupra]

I know the TB are the same size but aside from the TB I mean the manifold itself. Dont they have bolt on TB from a LEX or somethin?

 

[hottscennessey]

Turbo A is the only bolt on TB without boring out the stock one.

 

[socc924]

The only thing I could think of is maybe the accordian hose, since it is before the turbo, might show vacuum like a N/A motor would. You might be able to use that vacuum reading to hook into the ACIS. But I just honestly dont know if it would show any vacuum, or even correct vacuum, to run the ACIS off of it. Just a thought

 

[PorterzSupra]

The only thing I could think of is maybe the accordian hose, since it is before the turbo, might show vacuum like a N/A motor would. You might be able to use that vacuum reading to hook into the ACIS. But I just honestly dont know if it would show any vacuum, or even correct vacuum, to run the ACIS off of it. Just a thought

Thats an interesting idea

 

[Nick M]

That Y pipe is not a plenum feeding runners. It is there to feed both sides of the valve.

The best thing you can do if you build up the car is a larger plenum and shorter, but bigger diameter runners.

The valve opens at 4200 RPM, and JJ had shown during light cruise it would open at other TPS voltages for VE purposes.

 

[NashMan]

the n/a intake flow more evenly to every cyclder is does flow more = then the turbo one

this is going way back when some tested it out on flow bench

 

[wingman]

"remember that your system will only flow as much as the most restrictive part will let it"