Ported manifold on boosted car
 

Does any know or have proof that having a ported lower intake manifold would yield more HP than regular one when using FI? On NA cars it does, but what's the story once you're boosted?

What about specifically with the upper intake manifold from Stillen will the Z1 ported lower help? It's the setup I'm looking into running.


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The ported lower will yield more horsepower depending on the porting that is done, we are currently working with our ported lower and will be providing dyno graphs of before and after to show the gains with having the lower ported.

On a boosted engine?


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Good question - I'm interested as well.

The concept of porting is to increase the volumetric efficiency of the motor. By porting the intake manifold and or heads you are increasing the motors capacity to intake air and help with compression and then on the exhaust side to expel the gases.

By increasing the VE of the motor your hp/psi will increase.

Think of it this way... If porting the intake manifold makes more power n/a it will be drastically increased when put under higher pressures. Do note that modifying the plastic intake manifold could mean that it can't handle as much psi... This last statement is subjective but will also depend on how much material is removed and where from.

So short answer: porting the intake and exhaust allows the motor to work more freely and make more power.

I agree on all the above minus the increase in /psi. If you port, you open air to move more freely. Psi is a measure of restriction. If porting allows more air, you will see less restriction therefore less psi. But more power!

I believe its CFM vs PSI

PSI is pressure per square inch, on boosted car you'll have more, if you remove too much material from intake by grinding to remove restriction it can break...

My apologies guys... I meant to type decrease psi... Freaking autocorrect on my iPad thinks it knows car ****... Lol damn ai is trying to learn it some **** hahaha

As mentioned before as you reduce restrictions your psi should decrease for the same level of power. This is because you increased the volumetric efficiency of the motor. However, this means you can increase the psi to the old levels and gain more power that you did not have before. ;) hope that clarifies the confusion...

Ported manifold on boosted car
 

Confusion clarified ;)


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