Cold air in take for the M37X

Ray49 · Post by **Ray49** » Wed Aug 19, 2020 1:14 pm

I’m looking into installing a cold air in take into my 2013 M37X but I’m having trouble finding one that is compatible. There is one from K&N 69-7078TS says it fits the G37. Will that work on the M37. If you’ve installed a cold air intake what system did you go with and what are your thoughts?

Post by **pedsemdoc** » Wed Aug 19, 2020 3:06 pm

I bought an R2C off of a member on a G37 enthusiast's site.

You can see what it looks like here: what-did-you-do-to-your-m37-m56-q70-tod ... 85-90.html

Honestly, I don't think it made much of a performance difference, but they look real nice, especially if you get the black hex filters PLUS
(I had the black nickel finish) and I think the intake sound is louder.

Ray49 · Post by **Ray49** » Thu Aug 20, 2020 4:59 am

That does look nice I dig the black nickel finish. I figured it wouldn’t do much for performance but I do like the sound and looks of it. And the R2C was able to accommodate all the hoses on the left side? Thank you I appreciate the response and the pics.

Post by **pedsemdoc** » Thu Aug 20, 2020 8:58 am

Ray49 wrote: ↑
Thu Aug 20, 2020 4:59 am
And the R2C was able to accommodate all the hoses on the left side? Thank you I appreciate the response and the pics.

There is plenty of room on both sides - took a little wiggling and adjustment to make them sit just right and look symmetric (since people are always looking at your engine bay, right - lol. I did not use the brackets that come with the heat shields because they are stable enough without them and felt like I didn't need to clutter the engine bay.

Some users on the G37 site said the black nickel was hard to maintain - seemed to smudge too easily. I didn't have that problem. I just wiped them occasionally with a microfiber towel and they were good to go.

Post by **Shanehsmp** » Thu Aug 20, 2020 8:59 am

Get a pair of long tube intakes that install through the radiator support (370z or G37). There's a thread in this forum with a member installing his. You will need to drill ~3" holes in the housing to fit, but it's worth it imho (with a tune afterwards).

Post by **wideopn11** » Tue Aug 25, 2020 3:02 pm

Don't do K&N on these motors.
I run Takeda. I think most g37, 370z intakes will fit...some better than others.

Post by **attila** » Wed Aug 26, 2020 8:10 am

AEM sold a kit specifically for the M37..
https://www.aemintakes.com/cold-air-int ... finiti/m37

Post by **airmanhoward** » Thu Aug 27, 2020 1:35 pm

I would like to hear the AEM one in action.

Post by **cliffyk** » Fri Sep 04, 2020 6:46 pm

The stock intakes are "Cold" (actually "Cooler" air as there is no such thing as "cold" air) Air Intakes, and ones that were specifically tuned for the engine by engineers with access to air flow and engine performance instrumentation K&N and others can only dream about. Airflow is where volumetric efficiency comes from, which is where lowered emissions and maximum power and effective use of fuel (to brag about in ads) come from.

In this age a manufacturer would have to be just plain stupid to not install the best tuned, best flowing intake they could muster.

Intake air flow on a piston engine is not a constant draw, but rather a series of pulses each having a lower than ambient air pressure head, a near ambient pressure body, and a higher than ambient pressure tail. This is just the opposite of exhaust pulses; but like exhaust pulses they occur at varying frequencies proportional to engine speed. A properly tuned intake is designed to eliminate/minimize any harmonic stagnations brought about by harmonic resonances within the intake path. Intake tuning is at least just as important as exhaust tuning, and arguably more important.

Not a day passes that I do not hear some "fast & furious" wanna-be rice-mobile with an aftermarket CIA that on hard acceleration in mid-range rpm just makes a muted breathy "WAAAAHHHH..." sound as the engine struggles for air and the car struggles to do 20-45 in something under 8 seconds.

Post by **Shanehsmp** » Fri Sep 04, 2020 7:22 pm

cliffyk wrote: ↑
Fri Sep 04, 2020 6:46 pm
The stock intakes are "Cold" (actually "Cooler" air as there is no such thing as "cold" air) Air Intakes, and ones that were specifically tuned for the engine by engineers with access to air flow and engine performance instrumentation K&N and others can only dream about. Airflow is where volumetric efficiency comes from, which is where lowered emissions and maximum power and effective use of fuel (to brag about in ads) come from.

In this age a manufacturer would have to be just plain stupid to not install the best tuned, best flowing intake they could muster.

Intake air flow on a piston engine is not a constant draw, but rather a series of pulses each having a lower than ambient air pressure head, a near ambient pressure body, and a higher than ambient pressure tail. This is just the opposite of exhaust pulses; but like exhaust pulses they occur at varying frequencies proportional to engine speed. A properly tuned intake is designed to eliminate/minimize any harmonic stagnations brought about by harmonic resonances within the intake path. Intake tuning is at least just as important as exhaust tuning, and arguably more important.

Not a day passes that I do not hear some "fast & furious" wanna-be rice-mobile with an aftermarket CIA that on hard acceleration in mid-range rpm just makes a muted breathy "WAAAAHHHH..." sound as the engine struggles for air and the car struggles to do 20-45 in something under 8 seconds.

There's always one.

Intakes mounted in front of the radiator have been documented to provide HP gains when properly tuned.

I wish people would stop with the "the engineers at ______ designed this thing to perform as so and so and such and such..." just because it's enginered, doesn't mean it's engineered to provide the best possible outcome/performance.

Post by **Ilya** » Mon Sep 07, 2020 8:46 am

Shanehsmp wrote: ↑
Fri Sep 04, 2020 7:22 pm

cliffyk wrote: ↑
Fri Sep 04, 2020 6:46 pm
The stock intakes are "Cold" (actually "Cooler" air as there is no such thing as "cold" air) Air Intakes, and ones that were specifically tuned for the engine by engineers with access to air flow and engine performance instrumentation K&N and others can only dream about. Airflow is where volumetric efficiency comes from, which is where lowered emissions and maximum power and effective use of fuel (to brag about in ads) come from.

In this age a manufacturer would have to be just plain stupid to not install the best tuned, best flowing intake they could muster.

Intake air flow on a piston engine is not a constant draw, but rather a series of pulses each having a lower than ambient air pressure head, a near ambient pressure body, and a higher than ambient pressure tail. This is just the opposite of exhaust pulses; but like exhaust pulses they occur at varying frequencies proportional to engine speed. A properly tuned intake is designed to eliminate/minimize any harmonic stagnations brought about by harmonic resonances within the intake path. Intake tuning is at least just as important as exhaust tuning, and arguably more important.

Not a day passes that I do not hear some "fast & furious" wanna-be rice-mobile with an aftermarket CIA that on hard acceleration in mid-range rpm just makes a muted breathy "WAAAAHHHH..." sound as the engine struggles for air and the car struggles to do 20-45 in something under 8 seconds.
There's always one.

Intakes mounted in front of the radiator have been documented to provide HP gains when properly tuned.

I wish people would stop with the "the engineers at ______ designed this thing to perform as so and so and such and such..." just because it's enginered, doesn't mean it's engineered to provide the best possible outcome/performance.

You may disagree with how he posted his comment, but he's not wrong on this platform. The intake on the Y51 M is very likely as good as you are going to get. Unlike many intakes that pipe down towards the ground and as a result have a ton of tubing heat soaking, the OEM intake is above the radiator and is sucking in truly fresh air that hasn't been pre-heated by even 1*.

Post by **cliffyk** » Mon Sep 07, 2020 11:35 am

With the polymer tubing used in most contemporary intakes, heat tranfer to the incoming air is minimal. Even at idle as the velocity of the intake air is sufficiently high (45 to 50 cfm for the 3.7 L) that any heat transfer from the tubing to the moving air mass will be very slight--by 2000 rpm (128 cfm) tubing tubing to intake air heat transfer is negligible. This is also true, but not as true, of metal intake tubing. However adding the generally poor heat transfer/absorption characteristics of the plastic tube into the overall scheme further reduces heat transfer to the intake air to nearly trivial.

With plastic tubing heat soak of the intake tubing/etc. could induce measurable effect on intake air temps at start up and just after coming away from an extended idle, however beyond that it's effect is inconsequential as the dwell time of the intake air mass within in the tube is so brief...

Cold air in take for the M37X

Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

Re: Cold air in take for the M37X

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