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general => general discussion => Topic started by: Pure_Sincerity on Oct 20, 2011, 03:40PM

Title: Cold air intake + summer = no no ?
Post by: Pure_Sincerity on Oct 20, 2011, 03:40PM
so heres what I can gather.

Cold air intakes in summer just do not work, due to hot air expanding and having piping over 1m long just creates a massive lag accross the REV range untill you hit 3500rpm.

Where as the same setup in winter works a treat as colder air is more condensed meaning quicker and easier air flow.

Opinions:
1: leave as is
2: remove piping after J30 MAF and conduct a short ram for faster throttle response and airflow ?
Title: Re: Cold air intake + summer = no no ?
Post by: FuzzyDropbear on Oct 20, 2011, 04:28PM
Just leave it as is, in summer the temperature outside should still be lower than the temperature under your bonnet. Still, cooler air flowing into the engine.

Where are you going to pipe the shorter ram pipe to? Inside the engine bay, where it is warmer that outside temps? If you're not getting enough air through your intake, your piping must be extremely small.

Either way, the difference on a stock ka is going to be minimal at best.
Title: Re: Cold air intake + summer = no no ?
Post by: Pure_Sincerity on Oct 20, 2011, 04:37PM
It's ryans old 3" mandrel bend cai with a j30 maf. Piping size isn't an issue. It's just the lag due to such a long piping setup. In winter there was no lag, now summer, it takes a bit to pick up.
Title: Re: Cold air intake + summer = no no ?
Post by: Budgie on Oct 20, 2011, 05:04PM
I don't get it, isn't the air already in the intake? Why does it lag?
Title: Re: Cold air intake + summer = no no ?
Post by: dozer on Oct 20, 2011, 06:55PM
damn atmosphere being everywhere...  :P
Title: Re: Cold air intake + summer = no no ?
Post by: FuzzyDropbear on Oct 20, 2011, 07:45PM
damn atmosphere being everywhere...  :P

lol.

Yep, I'm lost. I don't get it.

The function of a CAI is to get the coolest air available into the engine and to reduce any restrictions which may be present in factory piping.. Are you saying that somehow you've created a situation in which the engine is using air faster than it can be replaced through the intake pipe? If so, how can it improve over 3,500rpm?

There is only one way in summer to get 'cold' air into your engine... and that's to drive around with a big f*** off air-conditioner attached to the front of your car.. or through a shopping centre.
Title: Re: Cold air intake + summer = no no ?
Post by: Budgie on Oct 20, 2011, 09:09PM
Yeah, thats what I was getting at guys.

I'z donztz getz itzsss...!!
Title: Re: Cold air intake + summer = no no ?
Post by: lgee on Oct 20, 2011, 10:55PM
your all morons, as we all know plastic tubing builds up static electricty from air flow, during the colder moths it it not so bad but during the hotter months it is worse, so the static charge in the pipe slows down the air flow due to the electrostatic drag from the pipe, over 3500 rpm the air is moving fast enuf that it becomes denser towards the middle of the pipe due to the air velocity and is not running as much on the outside wall of the tube therefore no as affected by the electrostatic drag created by by the static charge in the pipe.
Title: Re: Cold air intake + summer = no no ?
Post by: Vithy on Oct 21, 2011, 01:35AM
your all morons, as we all know plastic tubing builds up static electricty from air flow, during the colder moths it it not so bad but during the hotter months it is worse, so the static charge in the pipe slows down the air flow due to the electrostatic drag from the pipe, over 3500 rpm the air is moving fast enuf that it becomes denser towards the middle of the pipe due to the air velocity and is not running as much on the outside wall of the tube therefore no as affected by the electrostatic drag created by by the static charge in the pipe.

now there is something you dont learn in school!
Title: Re: Cold air intake + summer = no no ?
Post by: Budgie on Oct 21, 2011, 07:07AM
The old man's good for something :P ;)
Title: Re: Cold air intake + summer = no no ?
Post by: Colby on Oct 21, 2011, 12:36PM
your all morons, as we all know plastic tubing builds up static electricty from air flow, during the colder moths it it not so bad but during the hotter months it is worse, so the static charge in the pipe slows down the air flow due to the electrostatic drag from the pipe, over 3500 rpm the air is moving fast enuf that it becomes denser towards the middle of the pipe due to the air velocity and is not running as much on the outside wall of the tube therefore no as affected by the electrostatic drag created by by the static charge in the pipe.

Unfortunately it's steel pipe.
Title: Re: Cold air intake + summer = no no ?
Post by: SSS on Oct 21, 2011, 12:44PM
your all morons, as we all know plastic tubing builds up static electricty from air flow, during the colder moths it it not so bad but during the hotter months it is worse, so the static charge in the pipe slows down the air flow due to the electrostatic drag from the pipe, over 3500 rpm the air is moving fast enuf that it becomes denser towards the middle of the pipe due to the air velocity and is not running as much on the outside wall of the tube therefore no as affected by the electrostatic drag created by by the static charge in the pipe.

Mate, its called a boundary layer, and its thickness is defined by flow velocity, temperature and surface roughness. Has nothing to do with static electricity.
Title: Re: Cold air intake + summer = no no ?
Post by: Cheezel on Oct 21, 2011, 01:09PM
...Has nothing to do with static electricity.
But because it's (moving) steel pipe, and it's in the earth's magnetic field, it has it's own electric field and HENCE magnetic field. Thus air flow is ruined due to magnetism.
Title: Re: Cold air intake + summer = no no ?
Post by: mattyj on Oct 21, 2011, 02:51PM
I have a magnet on my fridge, just saying
Title: Re: Cold air intake + summer = no no ?
Post by: Budgie on Oct 21, 2011, 03:20PM
So do I... I wonder if that slows down my fridge?
Title: Re: Cold air intake + summer = no no ?
Post by: Cheezel on Oct 21, 2011, 05:34PM
Don't be rediculous. Your fridge isn't moving! So all effects are negligible. But when you've got a magnet on the fridge door, and swing that open. Well... ever wondered why it's hard to open a fridge quickly? "vacuum", I hear you say? WRONG! GO HANG YOURSELF. It's magnets, fool!
Title: Re: Cold air intake + summer = no no ?
Post by: Budgie on Oct 21, 2011, 05:38PM
*throws out magnets*
Title: Re: Cold air intake + summer = no no ?
Post by: Vithy on Oct 21, 2011, 05:58PM
go hang your self LOL!!!!
Title: Re: Cold air intake + summer = no no ?
Post by: noss on Oct 23, 2011, 11:54PM
all the piss taking aside, maybe clean out your throttle with throttle body cleaner, spray the aac valve as well, give the car a good tune (by that i mean clean the air filter, oil it lightly with air filter oil, check and maybe change plugs,  check fuel pressure etc etc) and also are you still using the antrx chip? i never gave you one for j30 i don't believe. could be the reason, that afm has a weird curve and requires a custom chip.

i ran that cai for years and as long as i kept the car tuned, no amount of static electricity, gravity or fucking magnets gave any reduction in power below 3500rpm. i actually calculated the length so the piping would hold as close as possible to 2.4 litres of air, which apparently is good for performance (intake holding same volume as your motor)

also while you're here asking questions, have a think about how many other people are running cai's and never swap them out for summer.

(http://pfleidi.github.com/slides-async-nodejs/images/fucking_magnets.jpg)

Title: Re: Cold air intake + summer = no no ?
Post by: lgee on Oct 24, 2011, 07:02AM


also while you're here asking questions, have a think about how many other people are running cai's and never swap them out for summer.


Pretty much every car built after 1995 has some form of cold air intake from factory, they dont get removed, you will be fine.
Title: Re: Cold air intake + summer = no no ?
Post by: Pure_Sincerity on Oct 24, 2011, 10:00AM
also are you still using the antrx chip? i never gave you one for j30 i don't believe. could be the reason, that afm has a weird curve and requires a custom chip.


If it wasnt tuned to the J30 MAF it wouldnt be running would it :p The tune you gave me was the stage 3 suited to the J30 maf...
Title: Re: Cold air intake + summer = no no ?
Post by: FuzzyDropbear on Oct 24, 2011, 10:52AM
Yep, it would still run, but it would most likely run like a pig, because it would be returning a different voltage to the ECU than it would with the standard AFM.
Title: Re: Cold air intake + summer = no no ?
Post by: noss on Oct 24, 2011, 11:36AM
If it wasnt tuned to the J30 MAF it wouldnt be running would it :p The tune you gave me was the stage 3 suited to the J30 maf...

i couldnt remember if i did you one or not. fuxxy is right though, it would run, but like a pig.

install some magnets in reverse polarity to the outside of the cai.
Title: Re: Cold air intake + summer = no no ?
Post by: Budgie on Oct 24, 2011, 12:33PM
LOL... magnets
Title: Re: Cold air intake + summer = no no ?
Post by: SSS on Oct 24, 2011, 12:42PM
Melbourne needs more magnets.
Title: Re: Cold air intake + summer = no no ?
Post by: lgee on Oct 24, 2011, 03:04PM
and we wonder why people dont post stuff on here
Title: Re: Cold air intake + summer = no no ?
Post by: Pure_Sincerity on Oct 24, 2011, 07:36PM
Let's all install magnets to our CAIs to drag out this "static electricity" -_-"
Title: Re: Cold air intake + summer = no no ?
Post by: JAWSTRX! on Oct 24, 2011, 07:51PM
Let's all install magnets to our CAIs to drag out this "static electricity" -_-"
Nah ill pass thanks  ;D
Title: Re: Cold air intake + summer = no no ?
Post by: Cheezel on Oct 24, 2011, 09:17PM
and we wonder why people dont post stuff on here
Oh come on, lil noss has been around long enough to know we're just being dicks. :D

But seriously, lil noss, I'm selling monopole magnets with the intention of getting rid of this. Call me :P
Title: Re: Cold air intake + summer = no no ?
Post by: mattyj on Oct 24, 2011, 10:35PM
I love it how immature I made this post
Title: Re: Cold air intake + summer = no no ?
Post by: lgee on Oct 24, 2011, 10:52PM
i thought it was funny people trying to shoot holes in my theory that i made up based on some other really not related thing i saw on mythbusters. lol
Title: Re: Cold air intake + summer = no no ?
Post by: Cheezel on Oct 25, 2011, 09:27AM
i thought it was funny people trying to shoot holes in my theory that i made up based on some other really not related thing i saw on mythbusters. lol
The "Which is the most economical way to drive a ute - tailgate up, down, etc" episode?
Title: Re: Cold air intake + summer = no no ?
Post by: lgee on Oct 25, 2011, 10:51PM
no it was about static electricity build up in plastic piping enuf to spark a fire, the rest was based on volumetric efficiency theory
Title: Re: Cold air intake + summer = no no ?
Post by: SSS on Oct 31, 2011, 12:18AM
my head are broken.