Just Commodores NSW
Cold Air Intake (2 Hole Mod) (VY) - D3CID3R Style
Hey guys, I ve just finished installing caold air intake on the VY, the desgin is based on Alien's Design , which can be found here.
CAI: Alien By Design
AND
http://swingtan.customer.netspace.net.au/2hole.html
Completed job
Last edited by D3CID3R; 23-06-2010 at 09:58 PM.
Just Commodores NSW
Banned
So long as its drawing air from a source outside the engine bay, i wouldnt think it'd make a great deal of difference.
The real gain would be from reducing the effort it takes to get the air from outside the engine bay to the engine. Meaning, since you still have the OEM airbox and intake in place, you'll notice 4/5th of f**k all difference.
Just Commodores NSW
Surely a k&n filter and the extra piping will improve economy...?
Banned
Highly doubt it.
Air filters make about 0.01% difference. All the "gains" you feel are in your head.
Any extra economy will be fairly insignificant.
You're really better of looking at a proper exhaust system and tune, and if you have an 3.8 ecotec it will make even less difference. From what i've seen (with a few different motors, be it Holden, Nissan, Toyota or Subaru) Fuel efficiency is about as good as it gets from the factory, Sometimes you can make it a little bit better with a tune and exhaust system with N/A cars but not drasically, and usually once these mods are done they driver tends to be a little more lead footed. Purely because he/she can or wants to hear the noise more. So any gains in fuel efficiency go out the window anyway.
To put it blunt, you're not going to see a 5ltr/100km drop in fuel usage with simply DIY mods. More probably you'll see 0.2/0.4ltr - 100kmh. And that would be with a whole exhaust and a real intake setup.
In regards to your intake setup.
While you're feeding the engine cold air (which is a good thing always.) The engine is still drawing it through the same airbox, the airfilter only has the same surface area as OEM, I'm assuming you still have the convoluted pipe which feeds the throttle body as well?
Convoluted pipe, does actually slow the airspeed down. It creates drag, but causing the air to tumble or roll through the pipe, which slows it down making the engine work harder to draw in into the inlet manifold.
How much difference changing this will make?
Probably nothing notable. But then changing one thing and expecting a result is kind of nieve when you're talking about engines which rely on hundreds of parts working in unison to work efficiently.
You really have to consider the effect one change will have on relating components, and how the relating components are acting with the rest of the engine.
For instance, you now have a source of cold air. But the engine is still drawing it through the same system. You change the system to a more efficient design, and then you'll have another restriction, wether it be in the throttle body, the intake manifold or the cam.
Ristrictions could be as simple as port matching. Matching an intake runner to the port in the head is quite simple to do. I'm not to sure how well they match from the factory but its always been something i've looked at with older motors.
Something I found easy when i first started tinkering with my own cars was to make sure the inlet manifold ports where smooth and the ports a tiny bit larger then the ports on the heads.
You really just need to think of the engine as a big airpump, the less effort it needs to move the same amount of air, the less fuel it will need to do the same job. The more efficient the methods of intake and exhaust, the less effort it will use.
Just Commodores NSW
Fair enough. Exhaust is next on the list, that will atleast cause less strain. im not really looking into too much engine work on the v6. Just something that will increase a bit of economy. I appreciate you help. But now I'm thinking it was a waste of time. Haha it you tell me it made some difference, I will be a happy man.
Banned
Haha, yeah it pretty much is a waste of time if you don't fix other things at the same time. Port matching manifolds is really very easy if you have some mechanical knowledge and a die grinder.
Just Commodores NSW
After doing some further research and hearing other opinions. I thank you for your opinion. But for now I would hve to disagree with you.
Last edited by D3CID3R; 04-04-2010 at 10:22 AM.
Banned
Most people probably would.
I still maintain that any difference is in your head.
Banned
meah... $30 and a bunnings. and anyone can make their own. id have the pick up underneath the front bar though. under idol at lights it'll get ambient temp air, not engine bar hot air
Just Commodores NSW
when i put the ss bar on, i mae a deflector to flick the air up into the cavity under to light ( like the pipe would of done)
how is this different to Aliens design
Just Commodores NSW
As I said it's similar to aliens but has larger in take piping
Even though it Is still using a standard airbox it will increase airflow regardless. My mate installed a kit CAI on his VE (pod filter and all new piping to sit behind the front bar) and he is not getting 70kms more to each tank of fuel. However in saying that he has a Calais with the larger exhaust fitted and a well tuned car which would largely effect the numbers imo. Good work though, i don't have the heart to cut up my airbox, i would rather buy a kit as like was said earlier the convoluted pipe does "slow" airflow but also so if anything stuffs up i just put the old airbox back onIf you ever decide to get a kit i think the MACE ones are pretty good
I have the same 2 hole Air Filter Housing mod on my VY Supercharged Calais together with a K& N Filter element , Extractors & a full twin exhaust from a R8 HSV ,plus a 10psi pulley on the blower & a 10degree cooler Thermostat . My opinion is that it has made a BIG improvement to my engine performance. I estimate something in the order of 25% more Kilowatts , the engine "Feels" better & idles better & fuel economy has actually improved to point I get 10l/100klm average (mainly country highway driving with a touch of city work. I recommend the 2 hole inlet mod as the Cheapest bang for bucks mod out!!!!!! It cost me about $6 all up And about 1 hours work.....(SOOPIE has a hold of Himself!!!!!)
Just Commodores NSW
Sounds freaking awesome too :P the induction noise sounds awesome from the street apparently
Hey Decider so what size pipe did u use and how did u do it? is it just the same method as Alien or different?
and have :)
get a pod with 100mm outlet then run 100mm pipe from pod straight to maf, (maf against throttle) i just did it today, with pod enclosed in stock box with cai and its bloody awsome. so worth it. power increase is so noticeable . sh!t's all over the high flow panal filterOriginally Posted by colgf
wow put up a picture bro sounds good
and have :)
i will when i do it again, gotter get another air box lid from wreckers and copy it "neatly" and use 100mm ally instead of 100mm plumbing pipe. will do it properly now that i know its worth keeping. looks dodgy as now. not bad for first go, and intake pipes wrapped in bright yellow kevlar too, looks gay lol
OEM+
$10 says it's all in your head and when you put it on a dyno you'll see **** all difference.
and have :)
have you try'd the exact same set up?
i'd bet $100 its not in my head. i've never had trac cont light flash befor when boot it at 20-30k's but have twice out of the 6-7times i did floor it tonight . mayb the pod, mayb the 100mm pipe the whole way mayb the kevlar wrap keeping it cooler , dont know, but it is def better, and the supercharger sounds deadly...
its the same with the cai's, they make a noticable difference, some may some may not, but dont know why people say that it dose not make any difference, its all in ya head...
and sorry for posting in op's thread.
Just Commodores NSW
sorry for late response guys, used 90mm PVC piping..
Massive induction noise, and fuel ecomony has never been better.. i dont see how helping a car breathe better doesnt aid performance...
I agree with Soop. The only improvement is in people's heads. I did the two hole mod on my SS because everybody swore black and blue it would go harder. What a crock of shit. All it did was make more induction noise. Well I'll have to take my wife's word on the noise because personally I couldn't hear anything.
Just Commodores NSW
That kinda hurt
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