Thank you for all the replies and advice ...
In South Africa we only get 93 & 95 Octane so I use an Octane Booster to achieve a 98 Octane ....
Some Tech comments from the Web ....
An engine that doesn’t have a turbo charger must rely on atmospheric pressure to supply air to the engine. That ratio is 14.7:1. Now if we use our example above colder air has more molecules, more molecules means more oxygen, engines burn oxygen, so the more you can cram in there the more power you can achieve. Since there is no turbo or intercooler on an N/A engine the only way to get colder air into the intake is to extend the pipe to the fenderwell or down below the engine where the air is cooler. On this example more oxygen is getting to the engine thus creating more power. On the flip side, you have extended the intake pipe about 3X the normal length meaning it makes it harder for the engine to pull the air into the engine. So a shorter length pipe would be ideal, but that would put the filter into the engine bay sucking in hot air. You would actually LOSE horsepower here because you are pulling in a lot less oxygen. In short, people using short ram intakes on an N/A motor are actually shooting themselves in the foot. The stock airbox is more efficient.
On the NA cars, the longer the intake tube, the harder it is for the engine to pull the air. That's only true, if your intake tube is A. too small, or B. has too many tight bends in it. If it's a well designed tube, there will be no restrictions. Most intake tubes I've seen for various cars, actually outflow the engine. As for NA cars, it would indeed be more beneficial to route the filter outside the engine bay. Then again, if it's just a 4 cylinder passenger car, you're not really gaining much anyhow. There's only so much pep you can produce, from a 4 cylinder passenger engine.
Overall, most of the time, the real benefit from a CAI, is the summertime, where there is a decent contrast between under hood air temps, and outside air temps. In the winter, (if you're in a cold state like myself) you're going to get your cold air regardless. Unless of course your engine bay is jam packed.
I am not trying to gain more power ...... just constant power .... yesterday it was 32 degC in Cape Town and
the S felt really flat....
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" Love the Sound of a V8....... All Day " *still wish it was a V10*
2002 S8 D2 F/L
H & R Springs, Koni Coil Overs, Dastek Chip, Sport Exhaust, 19" S5 Rims, Solar Sun Roof (Cause we have Sun) and most of the Bells & Whistles.
Last edited by Iyole; 13th January 2013 at 05:31 AM.
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