Short air intake vs heat

fabio · 06-08-2016, 07:45 AM

I'have seen a lot of post about the short air vs long tube or what are the gains vs stock, but one question remain... What about the heat?
Let's take for example that I an thinking of getting K&N instead of my OEM intakes. Would it be a problem with the heat? If i am stuck into the trafic?
Should i make custom piping?

Thank you

Chuck33079 · 06-08-2016, 07:53 AM

Either get an intake that moves the filters out of the engine bay, or stick with drop in filters and silicone maf tubes. Short ram intakes will heat soak badly. They show gains on a dyno with the hood open and a huge fan on it, but in the real world with a closed hood your intake air temperatures will be much higher than a CAI or even the stock setup.

Nixin · 06-08-2016, 08:00 AM

Quote:

Originally Posted by fabio

I'have seen a lot of post about the short air vs long tube or what are the gains vs stock, but one question remain... What about the heat?
Let's take for example that I an thinking of getting K&N instead of my OEM intakes. Would it be a problem with the heat? If i am stuck into the trafic?
Should i make custom piping?

Thank you

Hi fellow Canuk.
Just search this topic, so much has been written and discussed about it in this forum. As a relatively new member to the forum myself, I can tell you that the search feature is a great tool. The short air tubes are a waste of $$$. Chuck is 100% dead on in his comments. There are plenty of options with the long tube CAI like Stillen, Z1, Nismo, etc. Cheers.

DEpointfive0 · 06-08-2016, 08:19 AM

Quote:

Originally Posted by Chuck33079

Either get an intake that moves the filters out of the engine bay, or stick with drop in filters and silicone maf tubes. Short ram intakes will heat soak badly. They show gains on a dyno with the hood open and a huge fan on it, but in the real world with a closed hood your intake air temperatures will be much higher than a CAI or even the stock setup.

/thread.

Long tube intakes or nothing

ramoszx12r · 06-08-2016, 08:35 AM

Quote:

Originally Posted by Chuck33079

Either get an intake that moves the filters out of the engine bay, or stick with drop in filters and silicone maf tubes. Short ram intakes will heat soak badly. They show gains on a dyno with the hood open and a huge fan on it, but in the real world with a closed hood your intake air temperatures will be much higher than a CAI or even the stock setup.

COSMO · 06-08-2016, 10:06 AM

Why do you think the oem plenum is Plastic?? Metal is really bad for heat soak. Heat=less timing, Less Timing =power loss and efficiency.
Just get a drop in filter and call it a day..

Rusty · 06-08-2016, 10:48 PM

Quote:

Originally Posted by ramoszx12r

cofo11 · 06-08-2016, 10:57 PM

Quote:

Originally Posted by COSMO

Why do you think the oem plenum is Plastic?? Metal is really bad for heat soak. Heat=less timing, Less Timing =power loss and efficiency.
Just get a drop in filter and call it a day..

That's a half true statement though and depends on the use case. Metal heat cycles faster but for certain use cases that is actually a plus rather than a negative.

Sent from my SAMSUNG-SM-N915A using Tapatalk

YzGyz · 06-08-2016, 11:19 PM

Quote:

Originally Posted by DEpointfive0

/thread.

Long tube intakes or BOOST!

Quote fixed.

YzGyz

Nick M · 06-09-2016, 08:40 AM

Quote:

Originally Posted by Chuck33079

Either get an intake that moves the filters out of the engine bay, or stick with drop in filters and silicone maf tubes. Short ram intakes will heat soak badly. They show gains on a dyno with the hood open and a huge fan on it, but in the real world with a closed hood your intake air temperatures will be much higher than a CAI or even the stock setup.

Not to start a war as it relates to this endless debate, but real world data logging on most platforms/vehicles has shown many times - that once a car is moving ambient intake temps between "short ram" intakes and long tubes is much closer than the internet believes it is - and most of the gains found in long tube intakes is primarily credited to intake velocity and air turbulence, not some dramatic drop in intake temperature.

Chuck33079 · 06-09-2016, 08:49 AM

Quote:

Originally Posted by Nick M

Not to start a war as it relates to this endless debate, but real world data logging on most platforms/vehicles has shown many times - that once a car is moving ambient intake temps between "short ram" intakes and long tubes is much closer than the internet believes it is - and most of the gains found in long tube intakes is primarily credited to intake velocity and air turbulence, not some dramatic drop in intake temperature.

Yes, once the car is moving temps come down. The temp difference is pretty dramatic in stop and go traffic or normal commuting. Once you get to freeway speeds, you're right, the temps come down. But if you log IATs on this platform, the short rams are sucking in a lot of hot air at lower speeds and you can feel it pulling timing.

EDIT - That's why the OEM setup with drop in filters and silicone maf tubes works so well. It's still drawing outside air. You just leave a few HP on the table vs long tubes.

cofo11 · 06-09-2016, 09:11 AM

Quote:

Originally Posted by Nick M

Not to start a war as it relates to this endless debate, but real world data logging on most platforms/vehicles has shown many times - that once a car is moving ambient intake temps between "short ram" intakes and long tubes is much closer than the internet believes it is - and most of the gains found in long tube intakes is primarily credited to intake velocity and air turbulence, not some dramatic drop in intake temperature.

Yeah, I wasn't even about to touch that specifically. Also, imagine if someone was running a vented hood optimized for extracting hot air...

Sent from my SAMSUNG-SM-N915A using Tapatalk

06-08-2016, 07:45 AM	#1 (permalink)
fabio Base Member Join Date: May 2016 Location: Canada Posts: 7 Drives: 12 370z sport m6 Rep Power: 9	Short air intake vs heat I'have seen a lot of post about the short air vs long tube or what are the gains vs stock, but one question remain... What about the heat? Let's take for example that I an thinking of getting K&N instead of my OEM intakes. Would it be a problem with the heat? If i am stuck into the trafic? Should i make custom piping? Thank you

06-08-2016, 07:53 AM	#2 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Either get an intake that moves the filters out of the engine bay, or stick with drop in filters and silicone maf tubes. Short ram intakes will heat soak badly. They show gains on a dyno with the hood open and a huge fan on it, but in the real world with a closed hood your intake air temperatures will be much higher than a CAI or even the stock setup. 2011 Nismo#91, DEpointfive0, wanker and 2 others like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

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06-08-2016, 10:06 AM	#6 (permalink)
COSMO A True Z Fanatic Join Date: Dec 2012 Location: FL Posts: 1,816 Drives: 2012 Touring GTM TT Rep Power: 20	Why do you think the oem plenum is Plastic?? Metal is really bad for heat soak. Heat=less timing, Less Timing =power loss and efficiency. Just get a drop in filter and call it a day..