Stock airbox intake flow (pics)

[SpIcEz]

Did no one test a well sealed paper cone filter?

Just seems like they abandoned half way through.

Boxster aren't the only IC engines on the planet, principles of physics and engineering arent different in the M96 universe, unless I'm mistaken.

There is a reason that ITBs are the best nor NA engines, if you manage the air fuel right.
The most direct route is the best.

It just seems like everyone who abandoned just didn't build a well sealed unit to keep hot air out.

[Topless]

Originally Posted by SpIcEz

Did no one test a well sealed paper cone filter?

Just seems like they abandoned half way through.

Boxster aren't the only IC engines on the planet, principles of physics and engineering arent different in the M96 universe, unless I'm mistaken.

There is a reason that ITBs are the best nor NA engines, if you manage the air fuel right.
The most direct route is the best.

It just seems like everyone who abandoned just didn't build a well sealed unit to keep hot air out.

No one built a well sealed cone style paper filter so no, none tested. What is your attraction to the cone style specifically? Do you think it flows significantly more air than a pleated filter in an airbox designed and tested extensively at the Porsche R&D facility? Have you actually flow tested this yourself or do you rely completely on marketing claims? I suspect that the Porsche R&D testing is 100x more sophisticated than any aftermarket air filter company. What does Porsche use for their winning factory team GT3 Cup cars at 24hr Le Mans and 24hr Daytona? Check it out yourself.

Show me some hard independent data and we can have a conversation about which filter types measurably improve intake flow rates. Bisimoto did about the most extensive independent flow testing and he did not find significant improvement on the Boxster. Test results were within the margin for error (1-2hp) on his dyno for a given day.

There are applications for a cone style air filter and Bisi uses 2 on his completely custom 850hp Twin Turbo 911. They were an obvious choice because the turbos hang off the back of the car and need to be cleaned often being fully exposed to road grime. He has now gone fully electric with a 650hp Porsche 935. Fun guy and he lives about 20 minutes from my house. We see him often at events.

https://www.youtube.com/watch?v=-4HVBx1TmGE

[maytag]

Originally Posted by SpIcEz

Boxster aren't the only IC engines on the planet, principles of physics and engineering arent different in the M96 universe, unless I'm mistaken.



There is a reason that ITBs are the best nor NA engines, if you manage the air fuel right.

The most direct route is the best.

You're almost right. Or shall I say, half right.

I've been contending since I joined the Porsche world that there is no magic. These motors will respond to improvements, just like any other.
But here's the caveat: make sure you're really improving.

Why are ITB's the choice for many extreme- performance applications? Not because the most direct route is the best, as you stated, but rather because they are best at delivering large volumes of air at high velocity in a meter-able fashion. A difference with a distinction.

ITB's are not always better. They become a favored choice when traditional (cheaper) methods can't provide enough air for a motor's specific volume at rpm. But up until that point, they offer little (or no) benefit.

In other words: can your 986 engine in standard trim use more air than the OEM intake can provide? Tests show the answer is clearly "NO". And there's where the Porsche "magic" (which isn't magic at all) happens: that 986 intake was designed well enough that you need to modify other things before you'll see a need for an improved intake. This isn't your LS Camaro, trying to breathe through a tiny slot in a plastic can, with a spring loaded flap blocking it.

Start with the exhaust. Get it to breathe better there, then maybe a hi flow air filter can help. Then increase the size of the TB, and you will want to increase the size of the intake feeding it. But just throwing on an intake that can feed more air than the motor can use isn't going to help it.

And then there's the risk of introducing hot air while you're at it.



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[Starter986]

Originally Posted by maytag

You're almost right. Or shall I say, half right.

I've been contending since I joined the Porsche world that there is no magic. These motors will respond to improvements, just like any other.
But here's the caveat: make sure you're really improving.

Why are ITB's the choice for many extreme- performance applications? Not because the most direct route is the best, as you stated, but rather because they are best at delivering large volumes of air at high velocity in a meter-able fashion. A difference with a distinction.

ITB's are not always better. They become a favored choice when traditional (cheaper) methods can't provide enough air for a motor's specific volume at rpm. But up until that point, they offer little (or no) benefit.

In other words: can your 986 engine in standard trim use more air than the OEM intake can provide? Tests show the answer is clearly "NO". And there's where the Porsche "magic" (which isn't magic at all) happens: that 986 intake was designed well enough that you need to modify other things before you'll see a need for an improved intake. This isn't your LS Camaro, trying to breathe through a tiny slot in a plastic can, with a spring loaded flap blocking it.

Start with the exhaust. Get it to breathe better there, then maybe a hi flow air filter can help. Then increase the size of the TB, and you will want to increase the size of the intake feeding it. But just throwing on an intake that can feed more air than the motor can use isn't going to help it.

And then there's the risk of introducing hot air while you're at it.



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Hi May!

All that makes sense.

What about gutting the 986 aitbox internals... removing any internal mufflers... bends... twists... and turns? In other words... mitigating the internal turbulance caused by the twists and turns? Would have to remove the airbox... cut it open... take a Dremel or something to it... seal it back up... reinstall.

I'm curious.

I know Porsche engineers ran the numbers... but I'd like your opinion.

Thanks!

[SpIcEz]

Originally Posted by maytag

...

Start with the exhaust. Get it to breathe better there, then maybe a hi flow air filter can help. Then increase the size of the TB, and you will want to increase the size of the intake feeding it. But just throwing on an intake that can feed more air than the motor can use isn't going to help it.

And then there's the risk of introducing hot air while you're at it.

I 100% agree, that an intake by itself, wont give you much.
Exhaust, plenum, throttle body, etc.. are necessary to actually benefit.

And we are agreed as well that heat management is key. Its obvious by the placement and closed nature of our engine bay that, its not enough to just throw in a filter with more direct intake route.

There just seems to be this contention that there is no way to make more power than stock box, which I just cant believe from experience.