Hello all,

I currently have the JCW Airbox with K&N Filter, without flap on my 2006 cooper S, wanting to see if having a short cold air like this one
http://www.hps-siliconehoses.com/hps...ercharged.html
will affect its performance? is it mostly for looks? Im asking because of the Heat Soak the car already has, and having a filter thats not enclosed might hinder it?

any one have this experience? or just keep my JCW.

thanks.

p.s. and yes I'll be selling the JCW Airbox if anyones interested after.

 

If it's not drawing external air, it's not optimum. Might look cool but it's not providing the benefit it should.

 

its drawing air from the front grill, from the air duck still routing air there, then of course from my Honey comb cowl.. since the JCW has a big hole there.

just wondering which is better having it eclosed like the JCW, or DDM or have it open

 

I am always under the impression that external cold air was your best bet. The cowl area provides a zone of high pressure as well. I remember, when I existed in the Miata world, that the "Randall Cowl Intake" was consistently the best for making power simply because of the cold air charge. The DDM Works or the JCW are good and both pull through the cowl.

The intake you posted does not pull air through the front grill, it sits in the same spot as the stock airbox/DMM Works/JCW except it is open to pull hot air front the engine bay.

 

exacly, but as you can see, you still have the airduck from the front grill..

im planning on replaving that with a 90 degree elbow.. or leave it as it is and still get air from the front and the back though the cowl..

Dilema is, that set up thats open compare to the DDM / JCW thats enclose .

 

Yep. That's a great example of a hot air intake.

 

yup , so its not good then.LOL

thats what i was worried... keeping it enclosed is my best bet for performance.. so keeping the JCW then

 

That is a fraction of surface area/volume as the open filter in the engine bay. Put your mouth around a straw and breath in. Is most of the air coming through the straw or your nose?

 

i think you got it wrong.. my set up now is the JCW intake..enclosed and have an open hole in the back ( cowl ) as well as getting air from the front grill.

Question was, removing that box and going with that set up... having it open with no box..pros and cons..keep the box or no?

 

Since we are this hot air topic...

I've been thinking on Cutting holes on the left side plastic..to let cool air in from the left side from the cowl to cool down that area.. towards the coolant.

any difference you think?

 

No, I was trying to explain how the amount of cold air from the front of the car will be negligible because it will pull most of the air from the least restrictive place, the hot engine bay. Straw in mouth = front tube, open nose = open airbox in engine bay.

Currently your JCW pulls only from cooler, outside air because it is not able to draw air from the engine bay.

 

Found this link. https://www.mini2.com/threads/cai-un...eriment.42063/

looks like the box traps hot air in. Plus the cowl area is a neutral pressure not much air going into the cowl. 🤷🏻*♂️
Might get rid of the box now

 

We did a bunch of testing and so did DDMworks years ago on this.

the cowl is a LOW Pressure area not HIGH, so the air really isn't pulled from the cowl it comes from the grill through the stock hose. How do we know this is we did temp and pressure testing on the area and various airbox designs. We found you need an actual airbox to build pressure around the filter, without it the airflow into the engine is actually less. Having the actual airbox also showed the lowest intake temps as having the filter open to the engine compartment showed much higher temps as it obviously just sucked hot engine compartment air.
That is why we use and recommend the DDMworks airbox as it allowed the air in the box from the stock air inlet and would build pressure while driving in the box than it also kinda washes across the filter since it can exit the cowl. Ideally running the stock plastic firewall with a few bleed holes for the air worked even better, but didn't fit as well or easy with the airbox. Plus it made the intake noise so much less and customers really want the noise.

Your JCW box is actually really good as it is all plastic so it absorbs less heat from the engine compartment than a metal airbox, and uses the stock air inlet while it can build airbox pressure. If you notice the JCW airbox even plugged up the hole in the bottome of the airbox which is normally open on a non JCW airbox. We believe they also found the pressure build to be helpful and why they did that.

So personally since you already have the JCW I'd stick with that, if you really want to change I'd go with the DDMworks. but with these two we are splitting hairs at 1-2 hp if that.
https://www.waymotorworks.com/ddm-in...per-s-r53.html

 

thank you for that response Way, yes, i'm thinking the same thing now, since its plastic, it wont heat up as much as the metal ones..I was going more of the cosmetics point from the
engine bay... but now i wont sacrifice performance for it..

Gonna Keep the Box !

thank you

 

what about a Silicone Intake hose to JCW box? any recommendations?