TPI Tuned Port Injection discussion and questions. LB9 and L98 tech, porting, tuning, and bolt-on aftermarket products.
Sponsored by:
Sponsored by:

Cutting airboxes?

Thread Tools
 
Search this Thread
 
Old Oct 29, 2003 | 09:02 PM
  #1  
WishIHadAZ's Avatar
Thread Starter
Member
 
Joined: Jan 2003
Posts: 271
Likes: 0
From: northern va
Car: 87 iroc
Engine: L98 350
Transmission: 700R4
Cutting airboxes?

Allright I've seen mention of this as a "free mod" that works well but I can't seem to find anything about how to actually do this? Something with pictures would be ideal. I really want to play with my intake because the stock setup seems very restrictive. Any help is greatly appriciated. BTW I already have done a search.
Reply
Old Oct 29, 2003 | 09:25 PM
  #2  
BuckeyeROC's Avatar
Supreme Member
 
Joined: Sep 1999
Posts: 1,054
Likes: 0
From: Ohio, USA
Car: 2015 Camaro Z/28 & 2013 Super Bee
Engine: LS7 and 392 HEMI
Here's what I did:

http://community.webshots.com/photo/...69415897EoHPbc

Just take out the filter housing and fog lights and fog light ducts, cut out the squares in the housing like in the pic, and add an HVAC elbow for "ram-air". The duct was the PERFECT size to go from where the fog light used to be to the filters.
Reply
Old Oct 29, 2003 | 10:35 PM
  #3  
WishIHadAZ's Avatar
Thread Starter
Member
 
Joined: Jan 2003
Posts: 271
Likes: 0
From: northern va
Car: 87 iroc
Engine: L98 350
Transmission: 700R4
Thanks for the tips. I was kinda hoping to retain my foglights though... Any thoughts?
Reply
Old Oct 30, 2003 | 01:32 AM
  #4  
jamesbob02's Avatar
Supreme Member
 
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
You should be able to retain your foglights. You don't have to run a tube up to the filter area. Even if you do, it doesn't have to go to the foglights. Just make sure you don't screw up the wiring for them in cutting stuff. The most difference is probably made by just cutting out that crap under the filters. That's what I did - definitely a simple mod EVERYBODY should do to their TPI.
Reply
Old Oct 30, 2003 | 02:31 AM
  #5  
bigals87z28's Avatar
Supreme Member
 
Joined: Nov 2001
Posts: 4,456
Likes: 3
From: Ocean, NJ
Car: Check The Sig
yeah, its a great idea if you gut the boxes... more flow=better performance.

Now, i hear its a myth, but should i dissconnect my battery for a little and then alow my car to relearn its new breathing capacity or is that bull?
Reply
Old Oct 30, 2003 | 12:23 PM
  #6  
jamesbob02's Avatar
Supreme Member
 
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
That's a really good question - probably best suited for the DIY PROM board. I work on my car nearly every weekend, and always disconnect the battery first (shorted the valve cover on the alternator too many times ), so it doesnt make a difference in my case. The guys on that board should know then.
Reply
Old Oct 31, 2003 | 07:28 AM
  #7  
Vidman's Avatar
Member
 
Joined: Dec 2002
Posts: 118
Likes: 0
From: NC
Car: '86 Iroc
Engine: 350 TPI
Transmission: T-5 with Pro-5.0
Hi guys....

Was wondering about the gutted airboxes too and found this at Hawk's
http://www.hawksthirdgenparts.com/in...il?v=1&pid=779
I have heard and was wondering about it that if you gut the airboxes and do a ram air that you could get water (rain) into your engine. Is this a risk or not? Thanks!!!!!!!!
Reply
Old Oct 31, 2003 | 10:59 AM
  #8  
bigals87z28's Avatar
Supreme Member
 
Joined: Nov 2001
Posts: 4,456
Likes: 3
From: Ocean, NJ
Car: Check The Sig
depends on where you live really. People have said that they suck up water, some people get zero. I just gutted the boxes, and i dont drive it in the rain so im not worried about that. You can make your own for a lot cheaper if you really want to.
Reply
Old Oct 31, 2003 | 11:59 AM
  #9  
1bad91Z's Avatar
Supreme Member
iTrader: (1)
 
Joined: Jul 2001
Posts: 4,627
Likes: 5
From: Houston Area
Car: Faster
Engine: Than
Transmission: You!
Here's what I did: click here
Reply
Old Nov 2, 2003 | 11:36 AM
  #10  
MikeInAZ's Avatar
Senior Member
 
Joined: Oct 1999
Posts: 735
Likes: 2
From: Portales, NM USA
Car: 86 T/A
Engine: 5.0 TPI
Transmission: 700R4
You might read the article below before you start chopping. Some air cleaners (ex: 86 T/A) flow from from the inside out so by cutting holes in your airbox you render your car "without an air filter).

Double check your system flow.


http://www.gmtips.com/3rd-degree/dox...low/warn-1.htm
Reply
Old Nov 2, 2003 | 12:56 PM
  #11  
Fevre's Avatar
Member
 
Joined: Jan 2003
Posts: 404
Likes: 0
From: Hartland MI
Car: 89 Formula
Engine: 355
Transmission: 700r4
Axle/Gears: 3.73
Originally posted by MikeInAZ
You might read the article below before you start chopping. Some air cleaners (ex: 86 T/A) flow from from the inside out so by cutting holes in your airbox you render your car "without an air filter).

Double check your system flow.


http://www.gmtips.com/3rd-degree/dox...low/warn-1.htm
You would have to be a idiot to do that to the wrong box and not know it would be sucking unfilter air in. Sometimes people just do stuff they read about without even thinking about what is actually happening.
Reply
Old Nov 9, 2003 | 09:58 AM
  #12  
USAFIROC88Z's Avatar
Junior Member
iTrader: (1)
 
Joined: Sep 2002
Posts: 25
Likes: 0
From: Mechanicsburg, PA
Car: 86 Iroc
Engine: 420HP/440FT-LB SB355
Transmission: 700R4
Axle/Gears: 10 Bolt 3.73
does anyone have any data to back up the worth of doing this mod? I've been searching around and haven't really found what I'm looking for. Does it improve track times? Any slips to back it up? Any data around to see if doing the "ram air" setup flows cooler air, and manifold temps any cooler at all? I'm just curious to see the results before I venture into gutting my airbox and foglights etc. Thanks..
Reply
Old Nov 9, 2003 | 04:16 PM
  #13  
IROCThe5.7L's Avatar
Moderator
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
If you gut the boxes, can they ever be returned to stock? Or is it a permenant thing?
Reply
Old Nov 9, 2003 | 05:35 PM
  #14  
bigals87z28's Avatar
Supreme Member
 
Joined: Nov 2001
Posts: 4,456
Likes: 3
From: Ocean, NJ
Car: Check The Sig
No, no data on more hp or anything.

And once you do this, you cant repair it unless you melt the platic back together. Its a one time deal, you would have to buy a new one to take it back to stock.
Reply
Old Nov 9, 2003 | 11:31 PM
  #15  
jamesbob02's Avatar
Supreme Member
 
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
I don't think anyone has done back to back dyno's or track times with only doing this mod. It's just a no-brainer. If you look at the way it's constructed under the filters, you'll be shocked. Clearing that stuff out and getting it to fresh air only makes it breath better. On stock engines and low speeds, the difference will be approximately zero, but if you're at all interested at going fast, it's a necessary mod, that, if for nothing else, will give you peace of mind that it flows easy through there, and that's the bottom line. There's no good reason not to do it.
Reply
Old Nov 10, 2003 | 01:01 AM
  #16  
nikh23's Avatar
Supreme Member
 
Joined: Aug 2001
Posts: 1,228
Likes: 1
From: Caldwell, NJ
Car: 88 IROC Convertible
Engine: 305 TPI
Transmission: Raptor 700
sums it up quite well, theres no reason not to do it since its so obvious that it can only help. as for the rain thing, i never had a problem when i had my ducting in there but i never drove it in too much rain either so i can't really back it up 100%

Originally posted by jamesbob02
I don't think anyone has done back to back dyno's or track times with only doing this mod. It's just a no-brainer. If you look at the way it's constructed under the filters, you'll be shocked. Clearing that stuff out and getting it to fresh air only makes it breath better. On stock engines and low speeds, the difference will be approximately zero, but if you're at all interested at going fast, it's a necessary mod, that, if for nothing else, will give you peace of mind that it flows easy through there, and that's the bottom line. There's no good reason not to do it.
Reply
Old Nov 11, 2003 | 03:24 PM
  #17  
WishIHadAZ's Avatar
Thread Starter
Member
 
Joined: Jan 2003
Posts: 271
Likes: 0
From: northern va
Car: 87 iroc
Engine: L98 350
Transmission: 700R4
Alright, no one actually answered my question. How do you actually do this? Is there any benefit of just cutting the stuff under the filters if you dont have any ducting to put in its place?
Reply
Old Nov 11, 2003 | 03:56 PM
  #18  
jamesbob02's Avatar
Supreme Member
 
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
Yes, it will flow a lot better. Still, it would be better if you formed the tubes to get the "ram" effect, but cutting the boxes will do nothing but make the air flow better. Have you even looked below the filters? You'd be amazed at the crap they put right there! Just take a look, you'll see what to cut out.

Just in case, though - take out the entire assembly that holds the filters, set it up vertically, and use a hack saw(or something similar) to cut out the material below the filter, so they're just open squares. That's basically it - you can't screw it up if you look at it.
Reply
Old Nov 11, 2003 | 03:58 PM
  #19  
jamesbob02's Avatar
Supreme Member
 
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
BTW, look at the picture in the link BuckEyeROC posted at the top, and imagine that without the ducting. This is what it should look like when you're done cutting - just a open squares.
Reply
Old Nov 11, 2003 | 04:46 PM
  #20  
WishIHadAZ's Avatar
Thread Starter
Member
 
Joined: Jan 2003
Posts: 271
Likes: 0
From: northern va
Car: 87 iroc
Engine: L98 350
Transmission: 700R4
Yea I have looked at it already. And I can imagine how much better it could flow. How does this affect the air going to the radiator?
Reply
Old Nov 11, 2003 | 10:35 PM
  #21  
bigals87z28's Avatar
Supreme Member
 
Joined: Nov 2001
Posts: 4,456
Likes: 3
From: Ocean, NJ
Car: Check The Sig
Originally posted by WishIHadAZ
Alright, no one actually answered my question. How do you actually do this? Is there any benefit of just cutting the stuff under the filters if you dont have any ducting to put in its place?
Ok, to do it, take off the air cleaner, then there are a few plastic bolts that hold it down(i belive there plastic) and unscrew them. The plastic housing that set into the nose will come out. Take a saw (dremmel is highly recommended) and just cut the boxes. Make sure you leave the little lip so that the filters can sit on it. I did it in 10 mins. Also, wear a long sleeve shirt if your gunna do it with the dremmel. 20k RPM's+plastic=hot plastic goes flying. I put 2-3 cutting disks together and let her rip. There are some thick parts, but you its no match for the dremmel. Installation is the same as removal. dont forget to put the filters back in.
Reply
Old Nov 12, 2003 | 01:43 AM
  #22  
jamesbob02's Avatar
Supreme Member
 
Joined: Oct 2002
Posts: 1,042
Likes: 0
From: Oklahoma City, OK
Car: 92 Z28
Engine: 357 TPI (L98)
Transmission: 700R4
Just cutting the bottoms of the airboxes will do nothing to the radiator's airflow. However, if you seal up the foglight openings and tube them up to the airboxes, that changes things quite a bit. However, as long as your deflector piece is intact, the radiator should still be able to get plenty of air from under the front clip as opposed to through it.

If you're not planning on tubing it, you don't even need to worry, but even if you do, there shouldn't be a problem anyway. If you noticed major temperature differences, this would be cause for alarm and change, but chances of that are slim.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Linson
Auto Detailing and Appearance
28
Oct 24, 2025 02:00 PM
SRKLEGIN
Interior Parts Wanted
5
Oct 12, 2015 07:28 AM
gord327
Transmissions and Drivetrain
19
Oct 3, 2015 01:25 PM
Spyder_TheGamer
V6
5
Oct 2, 2015 12:25 PM
SRKLEGIN
Interior
3
Sep 30, 2015 07:19 PM




All times are GMT -5. The time now is 11:43 AM.