3.5" Air Intake

husam2012

I was wondering if anybody has a 3.5" intake or bigger installed in their 370z? I looked around and it looks like nobody has/makes them.


In the 350Z and especially maxima forums some have ran them with 10-15hp increase over the regular 2.5in intakes. Only one i've seen is sold by "Admintuning?" for the G37.

So, what do you guys think? Worth it for our platform?

Example:

Chuck33079

Is the increase in power due to the intake, or the fact it's running leaner with a larger than expected diameter with the stock MAF tables? I'd assume you would want a tune in conjunction with an oversized intake, and at that point how much of the power comes from tuning vs the intake itself?

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husam2012

I'm not sure if i can link other forums here, but this is an example:
Custom 3" Intakes on VQ35HR project.... - MY350Z.COM Forums

He was tuned with all the bolt ons including stillen gen2's, and he gained approx 15 hp after installing a 3" intake with a tune. (Page 6)

Chuck33079

A 3.5" intake would hit a hell of a bottleneck at the stock throttle body. My semi-wild *** guess would be that this may be useful if you have everything ported to match.

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Boss_302

Another thought , is going with a larger diameter tube allows the us of a bigger air
filter, Its a know fact that increasing the filter area will increase air flow at a reduce pressure drop. Therefore there is a possible increase in HP at some point in the operating range.

NorthStyle

The example you posted, I believe, is a G37. From what the guys were saying on their FB page, this vehicle did make +20whp throughout the range (+12whp peak) over the Stillen G3s. However, it made that amount after adding the EPS throttle bodies and tuning; how much of that is based of the intakes alone is anyone's guess.

As a heads up: after comparing the AAM intakes that I previously had to the inlets of the EPS TBs, one would assume that a larger diameter intake system would be benefical. The AAM intakes are 2.75" and the EPS inlets are appx. 3-3.25".

EDIT: I should also add that Admin Tuning advertises their 3" G37 intakes fit the 370z; I'm waiting on mine to arrive

Elmo370z

I was also thinking about scooping up a pair of his intakes

NorthStyle

From the dynos they've posted, the numbers don't lie and they've made more power than anything else currently available for the VQ models they offer. I also consulted with EPS in regards to which they recommended with their throttle bodies and they said the same thing.

I'm experimenting a bit since I'm going to pair them with the Z1 hi-flow intake upgrade since they use a velocity stack with the filter whereas the normal Admin tuning kit doesn't appear to.

husam2012

I actually read a lot about velocity stacks on the maxima forums and most seem to get no gains or 1-3 hp at most. It looks like i'll be getting the 3" intake and selling my GEN 3's along with getting a e85 tune at the same time! Doesn't look like anybody here has done the intake yet or havent posted about it.

NorthStyle

There's the one G37 but I'll be the first 370z as far as I know. Just a heads up, there's. 4-6 week lead time at the moment for them.

Regarding the velocity stacks, I'm not expecting much but any gains in power or response are better than none. Wishful thinking...

socce

Any updates on the Admin Intakes anyone ?

NorthStyle

Mine have been installed for about a month or so now... great items and Moncef from Admin Tuning is a good guy to work with.

I haven't been able to install my Z1 upgrade filters with the velocity stacks as I haven't been able to find anyone locally to cut and re-weld my crash bar, but beyond that I don't have any negatives... I will say that they're a bit of a pain to fit due to their size, but it is what it is.

I can't give you a cut/dry how it is over stock though since I had a lot installed all at the same time along with a couple weeks of data logging/tuning from Seb at Specialty Z, but the car is a blast to drive and throttle response is greatly improved.

ramoszx12r

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Tony Ramos

Rusty

too. 3.5" is 88.9mm. How big is the stock throttle bodies? Under 70mm. Hmmmm

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sirnixalot

by that logic we should all be running intake pipes the same diameter as the throttle body