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

Throttle body spacer

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Old Feb 12, 2006 | 06:10 PM
  #1  
M1tch's Avatar
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From: Cincinnati, Ohio
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
Throttle body spacer

I was reading a magazine and an advertisement came up about a throttle body spacer that can add up to 22 horsepower and 25 ft/lb of torque. I know these things do in fact add power but how much do they really add? Btw they were $99

Last edited by M1tch; Feb 12, 2006 at 06:32 PM.
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Old Feb 12, 2006 | 06:20 PM
  #2  
TierAngst's Avatar
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From: San Antonio
Car: 78 Caprice Coupe
Engine: 355
Transmission: 4L60
Axle/Gears: 3.42
They don't add nearly that much power, plus you run into things like clearance issues with the hood and you need to modify your throttle bracket since it will be offset with the spacer. Not really worth the trouble.
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Old Feb 13, 2006 | 08:33 AM
  #3  
M1tch's Avatar
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From: Cincinnati, Ohio
Car: 1989 Iroc Z
Engine: 496 BBC
Transmission: th400
Axle/Gears: 4.11
its seriously that hard to put on a little spacer?
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Old Feb 13, 2006 | 08:51 AM
  #4  
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Originally posted by M1tch
its seriously that hard to put on a little spacer?
Yes. There isn't any "slack" or play in the fuel lines and or throttle bracket. Rasing the TBI unit a mere 1/2" throws this all off. You will have to carefully bend your fuel lines and you will have to "tweak" your throttle bracket. It is even harder if your car is an automatic (TV cable can get fudged). Spacers are good as you want to increase your plenum volume as much as possible. However, they are a pain to install and are very pricey. Given their high cost you are better off spending that money on another mod that will produce greater results.
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Old Feb 13, 2006 | 09:33 AM
  #5  
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From: Pennsylvania
Car: 1989 Camaro RS
Engine: 350 Holley TBI Personally Tuned
Transmission: 5 Speed
They are right, i thought it would be easy, but after you get eveything all together the throttle line is at a weird angle, the fuel lines have a lot of stress on them, i took it off within a half hour of installation, i just didnt like it, the only thing that i thought it might have done was better throttle response, but putting my cars parts under stress like that isnt worth the throttle response to me, thanks!
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Old Feb 13, 2006 | 09:38 AM
  #6  
stitchop's Avatar
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From: In Hoxie Arkansas Posts: 12,547
Car: 91 firebird
Engine: 350
Transmission: 700r4
Does not sound like this would be a good mod if all you are going to do is the spacer.
Now it might be worth the trouble if you are putting a lot of work in your engine and looking for every bit of power from the TBI.

I had thought of doing this, but am glad you guys have already went through the trouble, now I can avoid your mistake!
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Old Feb 13, 2006 | 08:28 PM
  #7  
vorgath's Avatar
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From: San Diego, CA
Car: 1991 Camaro RS
Engine: LO3
Transmission: 700R4
Axle/Gears: 3.42 LS1
Damn if they really gace 22 lbs/ft of torque I'd order like five of them and stack them

I'm simply going to make my own, and make it around 1/2 inch, cheaper, easier
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