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  1. #1

    Default throttle body spacers

    Has anyone installed a throttle body spacer? Any noticeable performance / mpg improvement ?

  2. #2
    Master Mechanic TritonBoulder47's Avatar
    Join Date
    Nov 2009
    Tunkhannock, PA (North East)


    You won't get any "seat of your pants" HP gains, but you should get some, and you should also gain a little MPG...

    Tim a.k.a. Da' Boulder

    2003 Chevrolet Avalanche Z71 - Custom Emergency Response POV

    Firefighter, Fire Policeman, Ambulance Driver, Rescue Tech, Emergency Lighting Installer

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  3. #3


    A lot of it also depends on what motor you have in your truck. If you type throttle body spacer into the search bar, you'll come up with tons of posts about them.


    '94 Chevy Suburban K1500
    3" exhaust w/ aero turbine non-baffled muffler
    CFM Technologies TB spacer
    CB w/ 44" whip antenna

  4. #4


    been using an Airaid spacer for years. Could definitely feel the difference in response (no so concerned with HP). After running it for over a year, i took it out and tested the truck. I'll never do that again.
    99 Silverado - Stock

  5. #5
    Legend 2ToNe04's Avatar
    Join Date
    Apr 2009
    Fresno California
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    makes a difference for carb engine

    useless for fuel injected.

    i will paypal you 20 dollars if you gain 1 hp gain on a fuel injected

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
    Future Mods: 6.0 LQ4/9| Bags|

  6. #6


    TBI motors get a benefit as well.

  7. #7


    So it does nothing for fuel injected at all?
    2004 Silverado 1500 - 5.3L V8 Z71 EXT. CAB (DD)
    Sadly Shes Mostly Still Stock...
    Custom Painted Spyder Halo Headlights w/ LED 194 Replacements
    CP EBAY Bumper Lights w/ LED 194 Replacements
    CP LED Tail lights - LED 3RD Break Light
    De"badged" Tail Gate

  8. #8


    Quote Originally Posted by ИorτнRoαdΛĸ907 View Post
    So it does nothing for fuel injected at all?
    if your looking for HP increase, not really. Throttle response will be a bit better. The spacer's design is only to "swirl" the intake air allowing the fuel to better atomize and burn more of it. That's why it's threaded in the the bore.

  9. #9


    I've noticed a very small increase in fuel mileage, and small increase in off the line, and throttle response, some say it is worth the money, some say it's not, i think it's preference. Don't expect an increase in HP, because if it does, it wont be enough to notice anything.
    2002 Chevrolet Silverado 1500 z71 1985 Chevrolet Silverado k10 2006 Chevrolet Silverado 2500hd 6.6l LLY Duramax
    6.5" BDS Suspension Lift Edelbrock Carb & Polished Intake Manifold & Valve Covers NAPC Race Transmission & NAPC Built Transfer Case
    EFI Live Comp Cam and Valvetrain Snow Performance Methanol Injection
    35" Toyo Open Country Mud Terrain on 18" Ion Alloy 179's Headman Long Tube Headers and True Dual Exhaust FASS 150gph Titanium Series Pump
    AirAid Cold Air Intake with K&N Dry Filter & AirAid PowerAid Throttle Body Spacer 2" Suspension Lift 33x12.50r15 Tires EFI Live & AFE Stage 2 Intake
    Pacesetter Long Tube Headers with Cats Gone True Dual Exhaust FlowPro 3.73 Gears Yukon Grizzly Locker with Mag-Hytec Cover & Traction Bars
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