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

 

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.


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.

 

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.

2002 Nissan Maxima 4" Intake/MAF gains with stock TB:

 

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

 

The gain is from the larger piping. Tuning the AFR would be the norm when messing with MAF tube sizes. Keeping AFR the same before and after larger intake piping, the gains would be from larger piping.

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.

 

So you think you made 50hp from an intake haha. If I'm reading it blown up right, 249 to 298?

 

Don't read the 298 number. Read the 2 others. That is the gain.


How about this one, 3" to 3.5" Intake/MAF:

 

Has anyone tried or thought about this?

 

Do a before, then add 4" piping each side do another dyno then tune and do another and tell us how it worked out for you.

 

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