Cold Air Intake

hks_kansei · Postby **hks_kansei** » Tue Mar 13, 2012 9:47 am

ralt wrote:Hi.
Interesting air intake sticking above the bonnet. What happens if it is raining heavily or you park your car nose up in very heavy rain. Maybe do not drive in the rain. As usual all bling no real r & d. I will stick with my Loch Stewart system thanks. The man knew what it is all about.

I'm pretty sure the Autoexe one (with the little bonnet scoop) is open at the base of the carbon box.

Any water will simply run down and straight out the bottom.

Matty · Postby **Matty** » Wed Mar 14, 2012 5:08 pm

slimx wrote:Look in my opinion. Longer just adds to your response time. Thats why people will say little to no gains (i assume).

When u get a short ram intake like my intakes.

1. No comment on the sound. Its just amazing.

2. Car feels much more happier to rev it does honestly increase response time.

3. Obviously anything aftermarket absorbs more air. Oem is crap. It has a tiny tube that runs down the bumper that brings in a quarter of the size of the actual intake. Which is 2.5" - 3" i think that tube is like what 1" from memory?

To call the OEM system crap is misguided and foolish. It was designed to a different set of criteria to yours (at a guess: noise volume and quality, water ingress, dust ingress, serviceability, packaging, drainage, lifespan, cost)

The intake tube for the OEM airbox is about 2" diameter (slightly ovalised)

4. Our intake runs no where near the exhaust / headers therefore avoiding all the heat. It instead runs on the cold side of the engine where your intake manifold is.

5. Ofcourse an aftermarket air filter does bring in alot more air then a panel filter.

(excuse me if theres any errors wrote this on mobile phone)

The filter element itself makes 4/5ths of jack difference, and if you don't know this you are a fool, an ignoramus or a rip off merchant.

sailaholic · Postby **sailaholic** » Wed Mar 14, 2012 5:14 pm

That was refreshingly to the point. :-)

Sent from my GT-I9100 using Tapatalk

Sean · Postby **Sean** » Wed Mar 14, 2012 5:50 pm

Matty was a pioneer of MX5 intakes way back in the day, so I'd listen to whatever he has to say.

I remember one of the first technical things I read when I first got my first NA6 years ago was a detailed explanation of how intakes effected the MX5, the beauty of Matty's stuff was that he had real measurements and data to support all of what he was saying.

Hjt · Postby **Hjt** » Wed Mar 14, 2012 10:23 pm

He was just promoting his product guys, I can understand your point though Matty.

We all have our opinions (and facts ;))

hks_kansei · Postby **hks_kansei** » Thu Mar 15, 2012 7:56 am

Hjt wrote:He was just promoting his product guys, I can understand your point though Matty.

We all have our opinions (and facts ;))

We have a sponsor section for that.

Areas outside of that are for discussions, NOT commercial advertising.

zephyrus17 · Postby **zephyrus17** » Thu Mar 15, 2012 8:54 am

Yeah, autospeed did pressure drop measurements across various points and noted that the aftermarket filters did little to change anything. Most of the loss was before the filter itself.

Scoota · Postby **Scoota** » Thu Mar 15, 2012 1:18 pm

My advice... Check out the article on the AutoSpeed site: http://autospeed.com/cms/A_110680/article.html
This article describes how to "Free Flow" your MX-5 on a budget. His system is based on measurements of pressure drop across each of the segments of the standard intake tract on an NA6. The results are interesting. I would suggest you apply this approach; target the largest pressure drop.

I'd be really interested to see pressure drop testing of the various aftermarket systems. Forumites, is anyone out there willing to conduct this type of testing on their CAI's? Then the argument can be put to rest.

Matty · Postby **Matty** » Thu Mar 15, 2012 4:25 pm

for those new to this place, the "Autospeed" article was written by me.

Also of interest may be my testing of the NB intake - similar stuff but conducted slightly differently.
http://forum.miata.net/vb/showthread.php?t=288496
Again it shows the filter is almost insignificant.

It's such a cheap and easy test to do I'm amazed noone else has ever done it (that my years of forumising have ever found)

Hjt · Postby **Hjt** » Thu Mar 15, 2012 4:46 pm

Areas outside of that are for discussions, NOT commercial advertising.

I understand, trust me I would be the last one to defend his comments. Just trying to maintain order, Sorry all.

Scoota · Postby **Scoota** » Thu Mar 15, 2012 6:14 pm

Matty, big kudos goes to you for doing your own testing, and thanks for sharing via AutoSpeed.

OT: Folks, AutoSpeed has been a fantastic source of knowledge for me over the years. Matty's articles are just one example. Seriously, check it out.

Apu · Postby **Apu** » Thu Mar 15, 2012 7:23 pm

Matty wrote:for those new to this place, the "Autospeed" article was written by me.

Also of interest may be my testing of the NB intake - similar stuff but conducted slightly differently.
http://forum.miata.net/vb/showthread.php?t=288496
Again it shows the filter is almost insignificant.

It's such a cheap and easy test to do I'm amazed noone else has ever done it (that my years of forumising have ever found)

Oooh! You're THAT Matty! Kudos!

slimx · Postby **slimx** » Thu Mar 15, 2012 7:35 pm

Matty, my response to your first reply.

Is okay fair enough, i guess obviously they need to think about all those things

criteria to yours (at a guess: noise volume and quality, water ingress, dust ingress, serviceability, packaging, drainage, lifespan, cost)

Regarding the very slight difference, true but end of the day a difference. even if it is 4/5ths

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Hjt wrote:He was just promoting his product guys, I can understand your point though Matty.

We all have our opinions (and facts ;))

Thank you for not .. "turning this discussion upside down" HjT im suprised.
We cool now i presume?

--

hks_kansei wrote:We have a sponsor section for that.

Areas outside of that are for discussions, NOT commercial advertising.

Your right, i dont know i recomended it in the beginning i know thats okay.. but then got carried away with the posts afterwards. my bad

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Hjt · Postby **Hjt** » Thu Mar 15, 2012 7:59 pm

No problem with you, just don't like some of your advice. Your probably a nice person, just forums mix sh*t up.

Matty · Postby **Matty** » Fri Mar 16, 2012 4:50 pm

slimx wrote:Regarding the very slight difference, true but end of the day a difference. even if it is 4/5ths

OK, let's put this in analytical terms. On both the NA6 and NB8A I measured 3cm H2O restriction from a used, dirty air filter. So even with a theoretically perfect filter, that's the biggest improvement you're going to gain. But I'd guess any aftermarket unit (within reasonable physical size limits) might be 1-2cm at the best.

OK, now atmospheric pressure is equivalent to 10 metres of H20. So you've at absolute best made a 0.3% improvement to the air pressure entering the engine.

Which, if you're familiar with fluid dynamics and thermodynamics, will very roughly equate to the equivalent mass air flow achieved, and therefore the power achieved.

That equates to an extra 0.2 kW on a standard type MX engine.