TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

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Old Jan 2, 2005 | 06:00 PM
  #1  
Gr89RS's Avatar
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Why don't we just.....

Ok i've read all the threads on open element and no one has come up with the idea(or actually done it) of running tubing from the front of the car (ram air) and have the tubing pointed at the open element. This way you get the best of both worlds, an air filter that can breathe an unlimited amount of air, and with some tubing from say home depot...you can give it some colder air as well....this is so simple why hasn't anyone done it yet???
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Old Jan 2, 2005 | 06:27 PM
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From: Morris, IL
Car: '91 t-top RS; '91 hrdtp Z28
Engine: LO3;383tpi
Transmission: 700r4;very nice 700r4
Axle/Gears: 4.10 zt posi, 3.70 auburn
It has been done
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Old Jan 2, 2005 | 06:29 PM
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How, do they just point ducting at the open element unit or what???
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Old Jan 2, 2005 | 11:24 PM
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From: Moorestown, NJ
Car: 88 Camaro SC
Engine: SFI'd 350
Transmission: TKO 500
Axle/Gears: 9-bolt w/ 3.23's
The engine takes in ALOT of air at WOT. A small trickle of air wont make too much difference. Better off with boxed off cowl induction or something
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Old Jan 3, 2005 | 12:13 AM
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exactly... open element is 360* of airflow, even if you put two 3" ducts of ambient air into the engine bay, its still pulling in a LOT more air than those little ducts can give out. might as well do a dual snorkel...
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Old Jan 3, 2005 | 12:32 AM
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From: Calgary, AB
Car: 1993 Nissan 240sx
Engine: Turbo KA24DE
Transmission: 5 spd
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What options do we have, anyways? (besides an l69)
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Old Jan 3, 2005 | 01:24 AM
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From: Concord, CA
Car: 91 RS
Engine: 305 (lo3) T.B.I
Transmission: TH700R4/B&M shift kit
Option#1
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Old Jan 3, 2005 | 01:33 AM
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Originally posted by DARKWOLF
Option#1
Now if only I could figure out how the crap to do that on my TA..
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Old Jan 3, 2005 | 01:55 AM
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Car: 88 Firebird
Engine: 350 LO5 TBI
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dark wolf summed it up. Theres a place called ram air box that sells a piece that goes over your open element. I has an open tubing so you can funnel air into the open element and put one end up again a ram air opening.

I fabbed one based on their design but i dont have a ram air hood yet. Ill grab some pics of it if i ever get my cam fixed.

meanwhile heres a pic...
Attached Thumbnails Why don't we just.....-finalbox.gif  
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Old Jan 3, 2005 | 02:41 AM
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From: Concord, CA
Car: 91 RS
Engine: 305 (lo3) T.B.I
Transmission: TH700R4/B&M shift kit
Im not sure if I remember correctly, But I think its tricky with T/A's because the area in front of the radiator support will not accept the TPI intake box. I hollowed out the TPI air box by cutting out the areas that the two air filters sat in, and then made a sealed ram air duct by closing in the area below the box with fabricated sheet metal in the form of a ram air scoop. Then all you do is angle the intake elbow of your airbox toward the front of the motor, then figure out what you want to use to fit in between the elbow and the tpi duct.
here is a side picture of my motor from a while back!
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Old Jan 3, 2005 | 02:44 AM
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From: Concord, CA
Car: 91 RS
Engine: 305 (lo3) T.B.I
Transmission: TH700R4/B&M shift kit
Im not sure if I remember correctly, But I think its tricky with T/A's because the area in front of the radiator support will not accept the TPI intake box. I hollowed out the TPI air box by cutting out the areas that the two air filters sat in, and then made a sealed ram air duct by closing in the area below the box with fabricated sheet metal in the form of a ram air scoop. Then all you do is angle the intake elbow of your airbox toward the front of the motor, then figure out what you want to use to fit in between the elbow and the tpi duct.
here is a side picture of my motor from a while back!



Sorry about the double post!

Last edited by DARKWOLF; Jan 3, 2005 at 02:47 AM.
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Old Jan 3, 2005 | 04:07 AM
  #12  
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From: Toledo, OH
Car: 1992 Firebird
Engine: forged 357
Transmission: 700r4, 2200-2400 stall, vette servo
Axle/Gears: stock pegleg 2.73 drum (temp)
seems to me like a huge waste of time (your "before" picture), Darkwolf... that stock intake is dreadfully restricting. Glad you cleared it up.
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Old Jan 3, 2005 | 12:50 PM
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Hey Darkwolf, do you notice any power gains with that setup????
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Old Jan 3, 2005 | 04:42 PM
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From: Morris, IL
Car: '91 t-top RS; '91 hrdtp Z28
Engine: LO3;383tpi
Transmission: 700r4;very nice 700r4
Axle/Gears: 4.10 zt posi, 3.70 auburn
Do a search under my user name, and you will find not only pics of my set-up, but time slips comparing my ram air vs. open element as well. Also, I did not use the restrictive stock intake piece, but rather a caddy tbi with a much larger opening.

The bottom line in my opinion (having done it) is that ram air/cold air is just not worth it. It clutters the engine bay, requires extra money(albiet not a lot), and just doesn't look as nice as a shiny open element.
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Old Jan 3, 2005 | 05:56 PM
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Ya know I have seen a lot of pictures of that set up from Ram Air Box but I have never seen one on the car. Is anyone actually running the Ram Air Box and can post a picture?
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Old Jan 3, 2005 | 05:58 PM
  #16  
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From: Marietta, GA
Car: '91 Firebird Convertible
Engine: 305 TBI (LO3)
Transmission: 700r4, Vette Servo
Axle/Gears: 3.27 9 Bolt, PBR disks
Originally posted by DARKWOLF
Im not sure if I remember correctly, But I think its tricky with T/A's because the area in front of the radiator support will not accept the TPI intake box. I hollowed out the TPI air box by cutting out the areas that the two air filters sat in, and then made a sealed ram air duct by closing in the area below the box with fabricated sheet metal in the form of a ram air scoop. Then all you do is angle the intake elbow of your airbox toward the front of the motor, then figure out what you want to use to fit in between the elbow and the tpi duct.
here is a side picture of my motor from a while back!

Is it safe to assume that you just sealed the bottom stock filter assembly where the manifold stove connects? That looks pretty nifty (and right close to where I live!).
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Old Jan 3, 2005 | 07:04 PM
  #17  
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From: Concord, CA
Car: 91 RS
Engine: 305 (lo3) T.B.I
Transmission: TH700R4/B&M shift kit
In that picture I ghetto rigged the seal using a metal cap from a rubber cement can. Since then I have fabricated a much cleaner looking setup.

In response to Tokens comment, what part of my intake were you talking about. And what would you do to improve upon it??
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Old Jan 4, 2005 | 02:41 PM
  #18  
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From: Georgia
Car: 88 Firebird
Engine: 350 LO5 TBI
Transmission: 700R4 Vette Servo/Shift
I have a "ram air box" setup for my bird but its not installed due to fund shortage for a ram air hood. Im using the bolts from the plastic piece over the engine fan to bolt up a funnel which connects to 3" pipe feeding the air box around my open element. Its clamped togethor with a 3" exhaust band style clamp to keep it clean.

Im in michigan currently so I dont have access to my formula down south.
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