FRS / BRZ Intake Manifold - Development Thread - FT-86SpeedFactory by Velox

[s30series]

Only thing keeping me from buying it the nano-second it comes out is the fact that it will render my mishimoto catch can useless :-(

[Calum]

Originally Posted by s30series

Only thing keeping me from buying it the nano-second it comes out is the fact that it will render my mishimoto catch can useless :-(

Why is that?

[zooki]

Not too up on current manifold design, but having a plenum twice the displacement of the entire motor over each side wouldn't cause a lag in response? Especially with those short runners into the heads? Most of the intakes I've seen use smaller plenums for quicker response, and larger plenums for more high RPM power. Unless it's FI, then you just crank the wastegate shut... LOL
Anyway, can't wait to see the testing. 👍

[Draco-REX]

Originally Posted by zooki

Not too up on current manifold design, but having a plenum twice the displacement of the entire motor over each side wouldn't cause a lag in response? Especially with those short runners into the heads? Most of the intakes I've seen use smaller plenums for quicker response, and larger plenums for more high RPM power. Unless it's FI, then you just crank the wastegate shut... LOL
Anyway, can't wait to see the testing. ��

Looking at the design images, each cylinder gets it's own velocity stack. So I would think that such a large volume would serve two purposes.

First, at higher RPMs it would likely minimize the interference between the two cylinders, allowing the velocity stack tuning to be more effective.

Second, the large volume would shift the intake's natural resonance towards the low end, giving some low-end help where the velocity stacks would be less efficient.

But this is pure armchair engineering with just enough knowledge backing it up to be dangerous. So I'm likely way off base. This intake looks fantastic. My only regret is that the supercharger I've got replaces the intake. Ah well. Can't wait to see these in the wild.

[Captain Snooze]

Originally Posted by Draco-REX

Looking at the design images, each cylinder gets it's own velocity stack. So I would think that such a large volume would serve two purposes.

First, at higher RPMs it would likely minimize the interference between the two cylinders, allowing the velocity stack tuning to be more effective.

Second, the large volume would shift the intake's natural resonance towards the low end, giving some low-end help where the velocity stacks would be less efficient.

But this is pure armchair engineering with just enough knowledge backing it up to be dangerous. So I'm likely way off base. This intake looks fantastic. My only regret is that the supercharger I've got replaces the intake. Ah well. Can't wait to see these in the wild.

*raises hand*
Ok, I don't know sh*t about this sort of stuff but I thought that in this case the plenum was there to give the velocity stack a relatively clean volume of air. That is, the plenum emulates being free to atmosphere like in the pic.

[Draco-REX]

Originally Posted by Captain Snooze

*raises hand*
Ok, I don't know sh*t about this sort of stuff but I thought that in this case the plenum was there to give the velocity stack a relatively clean volume of air. That is, the plenum emulates being free to atmosphere like in the pic.
Attachment 102970

That's the first point I made. The large volume would let higher frequency pulses disperse and help the two stacks be more independent.

[Captain Snooze]

Originally Posted by Draco-REX

That's the first point I made. The large volume would let higher frequency pulses disperse and help the two stacks be more independent.

Ahhh... my apologies. I read that but didn't understand.

[s30series]

Originally Posted by Calum

Why is that?

Well, i should say the kit somewhat useless. Doesn't look like there is a PCV vent in the factory location, thus making the mishimoto supplied hose useless.....

Actually I dont see a PCV connection at all?

[eric6]

Originally Posted by s30series

Well, i should say the kit somewhat useless. Doesn't look like there is a PCV vent in the factory location, thus making the mishimoto supplied hose useless.....

Actually I dont see a PCV connection at all?

All connections are on the bottom side of the two plenums.

[Calum]

Originally Posted by eric6

All connections are on the bottom side of the two plenums.

Would you get more even flow from a vacuum source nearer the throttle body? I'm guessing the map sensor and the evap system would have a fit from pulsating vacuum...?

[Porcupint]

Originally Posted by Draco-REX

But this is pure armchair engineering with just enough knowledge backing it up to be dangerous. So I'm likely way off base.

But at least you recognize and admit it unlike a lot of people.

[eric6]

Originally Posted by Calum

Would you get more even flow from a vacuum source nearer the throttle body? I'm guessing the map sensor and the evap system would have a fit from pulsating vacuum...?

Possibly. The map sensor and ports are on the plenum floor, which is over an inch below the smallest bellhorn height. I do not think they will see much pulsating. They are also extremely close to the crossover tube which should help harmonize things between the two plenums.

[Hyper4mance2k]

Okay... So sick of waiting... I'm going to ask the only important question in this thread: has my order shipped yet?

[2much]

Originally Posted by Hyper4mance2k

Okay... So sick of waiting... I'm going to ask the only important question in this thread: has my order shipped yet?

has final production even started?