Ported manifold on boosted car

Kamillio · 08-27-2016, 02:36 AM

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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Nik@SOHO · 08-27-2016, 07:25 AM

Quote:

Originally Posted by Kamillio

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.

Kamillio · 08-27-2016, 10:50 AM

Quote:

Originally Posted by Nik@SOHO

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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RadioFlyer · 08-27-2016, 12:53 PM

Good question - I'm interested as well.

bullitt5897 · 08-27-2016, 05:12 PM

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.

TopgunZ · 08-27-2016, 07:49 PM

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!

scope22 · 08-27-2016, 08:54 PM

Quote:

Originally Posted by TopgunZ

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!

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...

zmanelite · 08-27-2016, 07:56 PM

I believe its CFM vs PSI

bullitt5897 · 08-27-2016, 10:33 PM

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...

Kamillio · 08-27-2016, 10:35 PM

Confusion clarified

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08-27-2016, 02:36 AM	#1 (permalink)
Kamillio Enthusiast Member Join Date: Mar 2015 Location: FL Posts: 445 Drives: N/A Rep Power: 52	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. Sent from my iPhone using Tapatalk __________________ 370z

08-27-2016, 05:12 PM	#5 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3683	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. __________________ *Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054*

08-27-2016, 07:49 PM	#6 (permalink)
TopgunZ A True Z Fanatic Join Date: Jun 2012 Location: Minneapolis Posts: 2,651 Drives: 06 350Z , 09 370Z MT Rep Power: 6834	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! Seb@SZ likes this. __________________ ROTREX SUPERCHARGER TUNER KITS - $6799/ CUSTOM STILLEN AIR TO AIR KITS -$2100/ 700+ WHP!! WWW.TOPGUNSPEEDWORKS.COM

08-27-2016, 07:56 PM	#8 (permalink)
zmanelite Track Member Join Date: Nov 2013 Location: Anaheim Posts: 753 Drives: 370 Z Nismo Rep Power: 37	I believe its CFM vs PSI __________________ Instagram @zmanscm

08-27-2016, 10:33 PM	#9 (permalink)
bullitt5897 Premium Member Join Date: Jan 2009 Location: North GA Posts: 6,831 Drives: Twin Turbo Z34 Rep Power: 3683	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... __________________ Shop Cars: 2013 318whp Nismo VspecII 370z SOLD, 2009 1000hp+ 93oct 4.0L TT 370z Fast Intentions STAGE 4 #054**

08-27-2016, 12:53 PM	#4 (permalink)
RadioFlyer Base Member Join Date: Aug 2014 Location: Los Angeles, CA. Posts: 193 Drives: 08 G37S S/C Rep Power: 40	Good question - I'm interested as well.

08-27-2016, 10:35 PM	#10 (permalink)
Kamillio Enthusiast Member Join Date: Mar 2015 Location: FL Posts: 445 Drives: N/A Rep Power: 52	Ported manifold on boosted car Confusion clarified Sent from my iPhone using Tapatalk __________________ 370z

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