Drivetrain (Cooper S) MINI Cooper S (R53) intakes, exhausts, pulleys, headers, throttle bodies, and any other modifications to the Cooper S drivetrain.

Drivetrain Weekend Project-DIY inexpensive CAI

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  #1  
Old 01-21-2006 | 07:10 PM
Outbackbob's Avatar
Outbackbob
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From: Medford, Or
Weekend Project-DIY inexpensive CAI

I decided to make a cold air intake using a K&N conical filter.
I had an old CAI setup laying around the garage that I took off my totaled Dodge Dakota. Had a good look at it and what's being offered for $200+ and said why not.

Here is the CAI, (well it's HAI right now till I get the airbox made).
So far I spent.
K&N filter- Free-New one runs $60.00 or less on Ebay.
Rubber Plumbing reducer w/clamps $5.00
2 1/4"x2" electrical PVC collar- $2.00
8"x18" aluminum sheet-$12.00
6' Weather seal rubber from junkyard-$5.00
Total- $24.00 $84.00 if you count a new filter.
Saved-$176.00 or $116.00 using a new filter.
15% pulley here I come


The tube is 4" dia. stepped down to 2 1/4". I used a rubber plumbing reducer for the stepdown.
I trimmed 1/4" off each end to shorten the length of the reducer.
I made a collar from 2 1/4" electrical PVC cut 2" long to go into the stock airhose.




The collar between the filter and the reducer was fabricated from the old CAI that was on my Dodge.
Any kind of pipe could be fashioned for that piece. PVC being the lightest and easiest to work with. I lucked out cause the pipe had a bracket attached that rests the filter on the bottom of the stock airbox. A double L bracket slipped under the clamp on the filter would work OK though. If you use a KN RX4950 filter it has a hole at the end of the filter that you can bolt a bracket to, plus you won't have to reduce the inlet the RX 4950 is 2 1/4" already. Or you can let the weight of the filter rest on the box opening.
I like the filter I'm using cause it has such a large opening (lot's of air being sucked down a tapered tube).

The stock airbox has not been modified (cut up) so it can always go back stock.
The bottom of the stock airbox is left intact and I'll be using air from the front vent as part of the intake air along with 6 holes I will make in the cowl firewall for air from the cowling.

Tools used-
Hack saw, drill, BFH, razor blade knife, screwdriver, pliers, file & grinder.
Cusswords used-
*#@@66, %#!+&*, plus a few more choice words depending on the severity of the cut or number of knuckles bruised.

I drove it in town and on the freeway with this HAI setup and what a difference! No more lag on takeoff that the MCSa is famous for and the supercharger spooling sound is awesome with excellent acceleration in auto or sport mode.

The next step is to get the CAI box made. Picked up a piece of 8"x18" aluminum sheet metal.
Went to the auto junkyard and got about 6' of weather seal for the top to hood seal. Cost me $5.00. Auto parts store wanted 10 bucks a foot. Sheesh

That's tomorrows project. Pics to follow.
 

Last edited by Outbackbob; 01-22-2006 at 11:32 AM. Reason: fixed pic link
  #2  
Old 01-21-2006 | 07:52 PM
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From: Houston
I have to say that ... this is actually uglier than the HAI. However, I applaud you on your pioneering spirit. Have you tried the HAI? How does it compare?
 
  #3  
Old 01-22-2006 | 11:40 AM
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Originally Posted by krazyivan831
I have to say that ... this is actually uglier than the HAI. However, I applaud you on your pioneering spirit. Have you tried the HAI? How does it compare?
Actually it looks pretty good in person. But, looks-smooks It runs great over stock especially low end. On an automatic MCS that's saying a lot.
As pictured (without heatshield) it is running as a HAI.
 
  #4  
Old 01-22-2006 | 01:40 PM
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From: Houston
I was referring to the HAI that others are using, utilizing a K&N filter clamped directly onto the throttle body.
 
  #5  
Old 01-22-2006 | 01:42 PM
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From: Collinsville, IL (St. Louis)
What is that you have installed in the PCV line? It looks like a fuel filter.
 
  #6  
Old 01-22-2006 | 02:38 PM
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Coop d'etat
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From: Wisconsin
Great job, and pics!! Check out https://www.northamericanmotoring.co...ad.php?t=43257 a thread on another variation on the $200 intakes.

Currently im running the HAI.
 
  #7  
Old 01-22-2006 | 04:23 PM
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From: Miami, Florida
looks good had fun didn't ya?
 
  #8  
Old 01-22-2006 | 05:48 PM
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From: Medford, Or
Originally Posted by BigBrownDog
What is that you have installed in the PCV line? It looks like a fuel filter.
Yes it is a fuel filter. I put it in to see if any oil is blowing into my supercharger before I make an oil catch can.
After about 200 miles the filter or the glass tube hasn't discolored.
 
  #9  
Old 01-22-2006 | 05:51 PM
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Originally Posted by krazyivan831
I was referring to the HAI that others are using, utilizing a K&N filter clamped directly onto the throttle body.
I didn't do the HAi as quoted cause I have an automatic and my breather tube has got 2 smaller hoses connected to it. So I didn't want to defeat that.
Besides when alls done this will be a CAI.
 
  #10  
Old 01-22-2006 | 05:56 PM
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Originally Posted by Bahamabart
looks good had fun didn't ya?
Yeah, but I'm having more fun with extra giddy-up-go

My OBX headers are due to arrive Tuesday and I will be shipping them out to be ceram coated. They will then be hooked up to 2.5 in 2.5 out magnaflow cat. Eventually I plan to install a Megan cat back.
But I'll do the 15% Alta pulley first.
 
  #11  
Old 01-23-2006 | 01:53 PM
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Her's a pic of my finished CAI using a K&N filter.
Cost me about $24.00 (I already had the filter). It would run about $84.00 with a new filter.


The line coming of the intake hose was rubbing against the heatshield so I tied a piece of hose around it to prevent it from rubbing through.
I painted the box with spray on bed liner to toughen it up and it looks pretty nice.
Did the swiss cheese mod then drove it. Wow! What a difference better low end power and a sound to match.
 
  #12  
Old 01-23-2006 | 02:48 PM
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From: oHIo
I like your roof on your house ... It might need some fresh paint
 
  #13  
Old 01-23-2006 | 06:15 PM
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Originally Posted by RED FURY
I like your roof on your house ... It might need some fresh paint
Actually that's my garage. It was a roadside garage back in the 20s. I live in a 1903 cottage and the landlord doesn't want any changes.
Historic thing.:impatient
Doesn't leak though.
 
  #14  
Old 01-23-2006 | 10:05 PM
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From: Back in AZ
Originally Posted by Outbackbob
Her's a pic of my finished CAI using a K&N filter.
Cost me about $24.00 (I already had the filter). It would run about $84.00 with a new filter.


The line coming of the intake hose was rubbing against the heatshield so I tied a piece of hose around it to prevent it from rubbing through.
I painted the box with spray on bed liner to toughen it up and it looks pretty nice.
Did the swiss cheese mod then drove it. Wow! What a difference better low end power and a sound to match.
So are you going to sale these? I will buy one for $24. less the filter. ( Heatshield and rubber seal )

Nice Job!
 
  #15  
Old 01-24-2006 | 11:23 AM
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From: Medford, Or
Originally Posted by MiniMeg06
So are you going to sale these? I will buy one for $24. less the filter. ( Heatshield and rubber seal )

Nice Job!
Let's see cost $24.00 sell for $24.00 now there's a good markup.
No I won't be selling them. I just wanted to show how easy it was to do for a lot ess than the pros are selling them for and get the same thing.
 
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