2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Built a new cold air box, observations (and pics!)

Thread Tools
 
Search this Thread
 
Old Apr 6, 2006 | 06:37 PM
  #1  
uRizen's Avatar
Thread Starter
XBL** Ownicus
Tenured Member 15 Years
iTrader: (2)
 
Joined: Mar 2004
Posts: 1,529
Likes: 0
From: St. Paul, Minnnesota
Built a new cold air box, observations (and pics!)

Before today I had my intake running down into the fenderwall using metal tubing with a cheap-o cone filter at the end. I crafted a piece of sheet metal to cover the filter but had to lose my brake duct (which was jacked up anyways.)

Since then I've added a strut bar which interfered with the tubing and despite all my best efforts I couldn't get it re-plumbed while keeping the AFM level, which was causing a lumpy idle. I didn't want to splooge on new tubing so I decided to come up with a different solution.

I grabbed some more sheet metal from Home Depot then built the airbox, sealed it with some foil tape and mounted teh AFM to it. Everything is nice and solid and the AFM is now level (but slightly cocked to one side to clear the fender.) I also put in a better filter and a little tube running down in the fender area. It also has foam trim on the top that's not in the pic that seals it against the hood.

My idle is MUCH better and after an hour of thrashing on it I noticed no performance difference between the air box or the fenderwell location. This is probably because the metal tubing used to get pretty heat soaked before and now that I'm using the stock tube it's balancing out better. The box also causes the intake sound to reverberate a bit and sounds more throaty and crisp then before.

Having tried both methods I'd definatly recommend the air box method.

Oh yeah, I detailed my engine a bit too since it's been in storage over the winter.
Attached Thumbnails Built a new cold air box, observations (and pics!)-detail.jpg   Built a new cold air box, observations (and pics!)-overall.jpg  
Reply
Old Apr 6, 2006 | 06:47 PM
  #2  
Jiffy01's Avatar
Full Member
Tenured Member 05 Years
 
Joined: Feb 2006
Posts: 53
Likes: 0
From: SLC Utah
Looks really good. Real clean. Did you get a template from a write up, or just figure it out yourself?
Reply
Old Apr 6, 2006 | 06:55 PM
  #3  
Valkyrie's Avatar
Lives on the Forum
Tenured Member: 20 Years
Liked
Loved
Community Favorite
 
Joined: Oct 2004
Posts: 5,151
Likes: 167
From: Japanabama
LOL, the word is SPLURGE, not SPLOOGE...

Nice work though... I need to make one of those too.
Reply
Old Apr 6, 2006 | 07:00 PM
  #4  
matts86fc3s's Avatar
southern style
Tenured Member 05 Years
 
Joined: Dec 2005
Posts: 436
Likes: 0
From: warner robins, georgia
yeah man looks like it will work good. i was expecting to see the stock air box with holes drilled in it to "produce more powah"... LOL, but yeah looks good, get some of that auto door edge moulding you find at parts stores and put that around the top edge of that box to really clean it up and get rid of that sharp edge.
Reply
Old Apr 6, 2006 | 07:19 PM
  #5  
iceblue's Avatar
Passing life by
Tenured Member 05 Years
 
Joined: Feb 2005
Posts: 4,028
Likes: 2
From: Scotland, USA
Nice
Reply
Old Apr 6, 2006 | 07:25 PM
  #6  
sar's Avatar
sar
Doin a rebuild.
Tenured Member 05 Years
iTrader: (1)
 
Joined: Aug 2004
Posts: 539
Likes: 0
From: Roswell (atl ) Georgia
get some urethane pipe insulation from HD to air seal it from the engine bay.
Reply
Old Apr 6, 2006 | 07:27 PM
  #7  
Pinfield357's Avatar
Rotary Enthusiast
Tenured Member 15 Years
 
Joined: Sep 2001
Posts: 1,417
Likes: 0
From: Pittsburgh Pa
that filter look tiny to me what are the dimensions of it?
Reply
Old Apr 6, 2006 | 07:54 PM
  #8  
Ravingecu21's Avatar
87 Mazda Rx-7 Mods**91 JDM
Tenured Member 05 Years
 
Joined: Feb 2006
Posts: 337
Likes: 0
From: Orlando,Fl
Clean!
Reply
Old Apr 6, 2006 | 07:57 PM
  #9  
ProjectR13B's Avatar
No es bueno.
Tenured Member 15 Years
iTrader: (1)
 
Joined: Oct 2005
Posts: 1,298
Likes: 0
From: Hampton, VA
very nice. hella clean engine bay too by the way
Reply
Old Apr 6, 2006 | 08:26 PM
  #10  
jimmynguyen114's Avatar
vRoOm~~Pop-pOp
Tenured Member 05 Years
 
Joined: Mar 2005
Posts: 49
Likes: 0
From: Anaheim, CA
hey do u have a template for the box u made. im about to do one too and yeah i wanna make sure its gonna fit nice n stay in place. nice box by the way....and that engine bay is clean lol u inspired me to get some lube and clean up 88 gtu's engine bay too lol i think our cars almost look alike too...red s4 hahah anyways congrats to the nice box and a clean 7
Reply
Old Apr 6, 2006 | 10:06 PM
  #11  
cbrinega's Avatar
still love the FC
Tenured Member 10 Years
 
Joined: May 2002
Posts: 360
Likes: 0
From: Dayton, Ohio
That looks very good. I see you bolted up the sheet metal in the same place I did near the radiator. I also enlarged the hole where the washer fluid bottle was and relocated the bottle to out in front of the radiator. Did you relocate your bottle or trash it?

I also made a lid. Another thing I've seen is to add some flexible rubber stripping (like around a garage door on the sides) to help seal up against the hood.
Reply
Old Apr 6, 2006 | 10:28 PM
  #12  
uRizen's Avatar
Thread Starter
XBL** Ownicus
Tenured Member 15 Years
iTrader: (2)
 
Joined: Mar 2004
Posts: 1,529
Likes: 0
From: St. Paul, Minnnesota
Cool, glad you guys like it. I didn't have a template so I just took some beer cases and used the cardboard to make a mock-up that I transfered to the sheet metal and cut it out with a tinsnips. I also do have some big chunks of foam weather stripping that go around teh edges to completely seal the box but left them off while I was cleaning a few things up.

I've been meaning to relocate the washer fluid resevoir as well, but haven't finished fabricating it. I basically took the cold start assist bottle and attached the washer fluid pump. I just have to seal it up and run the wires.
Reply
Old Apr 6, 2006 | 10:43 PM
  #13  
DerangedHermit's Avatar
Banned. I got OWNED!!!
 
Joined: Jan 2004
Posts: 2,040
Likes: 5
From: Knoxville, TN 37916
I like your mod. I was thinking of routing it down the fender, but this might change my mind. My only reservation is the room issue. I do like how running it down through the car frees up some space. Then again, I'm using the stock airbox... I guess anything would free up space.

When you say you recommend this over running it all the way down, is that only because of your strut bar, or just in general?
Reply
Old Apr 6, 2006 | 10:49 PM
  #14  
staticguitar313's Avatar
R.I.P. Icemark
Tenured Member: 20 Years
iTrader: (2)
 
Joined: Sep 2004
Posts: 4,229
Likes: 1
From: gilbert, arizona
How
Did
You
Get
Your
Engine
Bay
So
Clean!!!!!!
Reply
Old Apr 6, 2006 | 11:08 PM
  #15  
The Wankler's Avatar
FKITALL
iTrader: (14)
 
Joined: May 2004
Posts: 3,588
Likes: 2
From: Dublin Ca.
^^^^^^^ word... Looks great!
Reply
Old Apr 6, 2006 | 11:31 PM
  #16  
teamfuel's Avatar
89 Turbo II
Tenured Member 10 Years
 
Joined: Jan 2005
Posts: 362
Likes: 0
From: Oklahoma City
Clean, looks good.
Reply
Old Apr 6, 2006 | 11:49 PM
  #17  
uRizen's Avatar
Thread Starter
XBL** Ownicus
Tenured Member 15 Years
iTrader: (2)
 
Joined: Mar 2004
Posts: 1,529
Likes: 0
From: St. Paul, Minnnesota
Originally Posted by DerangedHermit
I like your mod. I was thinking of routing it down the fender, but this might change my mind. My only reservation is the room issue. I do like how running it down through the car frees up some space. Then again, I'm using the stock airbox... I guess anything would free up space.

When you say you recommend this over running it all the way down, is that only because of your strut bar, or just in general?
Just in general this mod seems to work better. Running it straight down was kinda cool at first but the mounting was a pain, there were more joints that could fail and it interfered with the strut bar. Using the box was simple and cheap, works just as well from a performance standpoint and looks pretty decent.

As for the cleaning, I took everything out of the bay except the long block, brake components, clutch stuff and the electrical and scrubbed it down with degreaser. I then painted all the metal lines and brackets that were corroded and used a dremel with a carbon steel brush to clean up the bare metal like the block and accessories. Cleaning is basically all I did this winter since it was in storage and I could do it in my heated basement once I brought the parts down there.
Reply
Old Apr 7, 2006 | 12:05 AM
  #18  
88rxn/a's Avatar
tom port.. AKA streetport
Tenured Member 15 Years
iTrader: (6)
 
Joined: Jan 2005
Posts: 4,658
Likes: 0
From: ludlow, pa
hoooooooooooolyyyyy clean!!!!!!!!!
nice
Reply
Old Apr 7, 2006 | 12:27 AM
  #19  
JMY952's Avatar
Full Member
Tenured Member 05 Years
 
Joined: Jun 2005
Posts: 226
Likes: 0
From: Minnesota
Damn...I'll pay you to make my engine bay look like that! haha..
Reply
Old Apr 7, 2006 | 03:48 AM
  #20  
staticguitar313's Avatar
R.I.P. Icemark
Tenured Member: 20 Years
iTrader: (2)
 
Joined: Sep 2004
Posts: 4,229
Likes: 1
From: gilbert, arizona
well, looks like i'll have to jump on the band wagon as far as engine cleanup goes, as i'm doing a full color change on my car i'll be forced to remove everything from the bay, might as well restore the finish on everything right? Good work, are you going to duct fresh air from the brake duct?

- Jared
Reply
Old Apr 7, 2006 | 09:40 AM
  #21  
uRizen's Avatar
Thread Starter
XBL** Ownicus
Tenured Member 15 Years
iTrader: (2)
 
Joined: Mar 2004
Posts: 1,529
Likes: 0
From: St. Paul, Minnnesota
Originally Posted by staticguitar313
well, looks like i'll have to jump on the band wagon as far as engine cleanup goes, as i'm doing a full color change on my car i'll be forced to remove everything from the bay, might as well restore the finish on everything right? Good work, are you going to duct fresh air from the brake duct?

- Jared
That sounds like a heck of a project. It's fun putting nice clean parts back in though.

I just need to hit uop the u-pull and find another brake duct then I'm going to use the old CAI tubing and run it to the top.
Reply
Old Apr 7, 2006 | 10:09 AM
  #22  
fcdrifter13's Avatar
Play Well
Tenured Member: 20 Years
 
Joined: Feb 2005
Posts: 4,218
Likes: 0
From: We're all fine here now, thank you. How are you?
2 days of scrubbing with purple power and mine still isnt that clean. Nice mod by the way, where is the pipe going o that is welded to the bottom right now. I may have missed that somewhere.
Reply
Old Apr 7, 2006 | 10:11 AM
  #23  
rotorforce's Avatar
I'm back Bishes
Tenured Member 10 Years
 
Joined: Jan 2006
Posts: 1,241
Likes: 0
From: Rhode Island
Interesting work and very clean engine bay...Thumbs up.

Serious question: What are the benefits of having the air filter blocked off from the rest of the engine bay?

Looks like you used aluminum, while it has a great heat disbursment, it looks thin enough where it will always absorb engine bay heat and transfer it into the boxed off area. Maybe I am looking to far into this!
Reply
Old Apr 7, 2006 | 10:18 AM
  #24  
uRizen's Avatar
Thread Starter
XBL** Ownicus
Tenured Member 15 Years
iTrader: (2)
 
Joined: Mar 2004
Posts: 1,529
Likes: 0
From: St. Paul, Minnnesota
The pipe will be used to attach another little pipe that runs to the brake duct.

Having the intake air seperated helps quite a bit. I originally had the filter just sitting in the bay sucking in engine air and the car would beging to bog a bit after 15 minutes of running hard. After seperating it from the bay that cleared up and definatly helps.

The metal does transfer heat still, but it's not nearly as much as it was sucking in before. That box is also sealed so the theory is that the air doesn't dwell too long in there and fresh cold air is being pulled in from the inlet in the bottom.
Reply
Old Apr 7, 2006 | 10:30 AM
  #25  
rotorforce's Avatar
I'm back Bishes
Tenured Member 10 Years
 
Joined: Jan 2006
Posts: 1,241
Likes: 0
From: Rhode Island
Gotcha! Thanx!
Reply



All times are GMT -5. The time now is 02:45 AM.