Larger Diameter Intake Piping
03-07-2014, 11:10 AM
#1
Larger Diameter Intake Piping
I picked up a 2010 G37 Sedan a few weeks ago. Came from the Maxima scene, we have people running single 4" intake/MAF intakes on a vq35de. Obviously a tuning device would be needed to compensate for the larger diameter at the MAF.
What diameter is the largest and smallest part of the Stillen Gen3?
Thinking if I'm going to be paying that much for piping, I can get it custom made with a larger diameter. Cold air intake would not apply here since air velocity would be lost if the piping ran that long. Heat shielding would be a must for a Short Ram.
I know inner diameter is smaller but for simplicity I used outer diameter.
Circumference of a single 4" piping: 201
Circumference of a single 2.5" piping: 78.53
Dual 2.5" piping: 157
Circumference of a single 3" piping: 113
The Goal:
Dual 3" piping: 226
What diameter is the largest and smallest part of the Stillen Gen3?
Thinking if I'm going to be paying that much for piping, I can get it custom made with a larger diameter. Cold air intake would not apply here since air velocity would be lost if the piping ran that long. Heat shielding would be a must for a Short Ram.
I know inner diameter is smaller but for simplicity I used outer diameter.
Circumference of a single 4" piping: 201
Circumference of a single 2.5" piping: 78.53
Dual 2.5" piping: 157
Circumference of a single 3" piping: 113
The Goal:
Dual 3" piping: 226
03-07-2014, 11:22 AM
#2
Registered User
What diameter is the largest and smallest part of the Stillen Gen3?
Thinking if I'm going to be paying that much for piping, I can get it custom made with a larger diameter. Cold air intake would not apply here since air velocity would be lost if the piping ran that long. Heat shielding would be a must for a Short Ram.
I know inner diameter is smaller but for simplicity I used outer diameter.
Circumference of a single 4" piping: 201
Circumference of a single 2.5" piping: 78.53
Dual 2.5" piping: 157
Circumference of a single 3" piping: 113
The Goal:
Dual 3" piping: 226
Its pointless. The motor can only flow what it flows. Making the MAF think its flowing more isn't going to do anything since in tuning you'll just tune down the MAF thinking its OEM size again. You only need bigger pipe when you max out the MAF voltage which would only happen if you run a blow through turbo setup. The stillen 2.35" ID is more than enough for a NA motor. If you want to try and increase air flow you need a bigger TB, mani, lower runner mani and port the heads. It does you no good to run 3" pipe when the TB is 2.35" ID.
Build your own
Z1 post tubes
OEM MAF housing cut off of the OEM air box
2.5-2.5" straight coupling
2.5" piping, about 8"
2.5-2.5" 45 degree coupling
More 2.5" piping, about 7"
2.5-2.5" 90 degree coupling
More 2.5" piping, about 4"
2.5-3" reducer coupling
3" piping, about 3"
K&N filter same as stillin
Silicone is better than all aluminium for coolness anyways.
Last edited by Synolimit; 03-07-2014 at 11:32 AM.
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jfisher (06-03-2016)
03-07-2014, 12:07 PM
#3
3" and 2.5".
Its pointless. The motor can only flow what it flows. Making the MAF think its flowing more isn't going to do anything since in tuning you'll just tune down the MAF thinking its OEM size again. You only need bigger pipe when you max out the MAF voltage which would only happen if you run a blow through turbo setup. The stillen 2.35" ID is more than enough for a NA motor. If you want to try and increase air flow you need a bigger TB, mani, lower runner mani and port the heads. It does you no good to run 3" pipe when the TB is 2.35" ID.
Its pointless. The motor can only flow what it flows. Making the MAF think its flowing more isn't going to do anything since in tuning you'll just tune down the MAF thinking its OEM size again. You only need bigger pipe when you max out the MAF voltage which would only happen if you run a blow through turbo setup. The stillen 2.35" ID is more than enough for a NA motor. If you want to try and increase air flow you need a bigger TB, mani, lower runner mani and port the heads. It does you no good to run 3" pipe when the TB is 2.35" ID.
And by saying there is no point running a larger piping on a smaller diameter TB is not pointless. That is like saying running a larger piping before the MAF is pointless. The MAF will not see a higher voltage because you are running larger piping not more air velocity. You now have to tune via AFR the difference in air quantity not velocity.
2002 Nissan Maxima 4" Intake/MAF gains with stock TB:
03-07-2014, 01:35 PM
#4
Registered User
It's not about making the MAF think, the MAF will not see the additional flow. It is about tuning for a larger diameter piping.
And by saying there is no point running a larger piping on a smaller diameter TB is not pointless. That is like saying running a larger piping before the MAF is pointless. The MAF will not see a higher voltage because you are running larger piping not more air velocity. You now have to tune via AFR the difference in air quantity not velocity. ]
And by saying there is no point running a larger piping on a smaller diameter TB is not pointless. That is like saying running a larger piping before the MAF is pointless. The MAF will not see a higher voltage because you are running larger piping not more air velocity. You now have to tune via AFR the difference in air quantity not velocity. ]
I am saying that. Any gains will be from the tune. If you know more than stillen and others have at it. All youre doing is making the cost of the tune go up. If you want to be the first person since 09 to do a big intake with a tune and beat all other intakes with just a tunes numbers, here's to ya
03-07-2014, 02:17 PM
#5
Can't see anything, its a blur.
I am saying that. Any gains will be from the tune. If you know more than stillen and others have at it. All youre doing is making the cost of the tune go up. If you want to be the first person since 09 to do a big intake with a tune and beat all other intakes with just a tunes numbers, here's to ya
I am saying that. Any gains will be from the tune. If you know more than stillen and others have at it. All youre doing is making the cost of the tune go up. If you want to be the first person since 09 to do a big intake with a tune and beat all other intakes with just a tunes numbers, here's to ya
I am not knocking any other Intake brands in any way. Being bolt-on without requiring a tune does not mean you have a product that maximized the gains to be had.
Hopefully in the near future I can put this to rest.
03-07-2014, 06:59 PM
#10
Registered User
Then 100% it is not a gain, I promise. In fact I bet its hurting from an improper MAF scaling. I see an increase of 11hp and 7tq if I squint and read that right. But if you look at the blue AFR it was way to rich before. The red line is leaned out which accounts for the 11hp and 7tq. Fueling alone without a doubt! should gain that much power. So the intake did absolutely nothing since again those gains can be had from a leaner AFR. The stillen on these cars with no tune can get you more increase than that.
Without knowing AFR there's no way to tell. It could all be from a leaner tune with more timing. No way to tell at all
Without knowing AFR there's no way to tell. It could all be from a leaner tune with more timing. No way to tell at all
Last edited by Synolimit; 03-07-2014 at 07:11 PM.
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