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  1. #1
    Jr. Mechanic TUTONE's Avatar
    Join Date
    Apr 2009
    Southern Ohio

    Default Throttle body spacer?

    What is the function of a throttle body spacer? They claim better gas mileage and increased horsepower; is this true? I have a 1990 1/2 ton Chevy Suburban 5.7L TBI and was looking for a relatively inexpensive way to increase HP and MPG. The engine has over 185,000 miles (still runs great) and I know it's probably about time for a rebuild but until then... I do a lot of towing (mostly firewood and building materials) so any little thing I could do would help.



    1990 Chevy Suburban V1500 4x4 "Church Bus"
    5.7L TBI
    3" lift - 35" tires
    WARN Manual Locking Hubs

  2. #2


    This will allow more air into the throttle body which will alter your Air/Fuel Ratio for the better. You should only be getting about 5HP from it but it's a pretty inexpensive mod
    '02 Silverado Z71;Black; Ext. Cab; Magnaflow Shortbody; K&N Filter

  3. #3


    Yes, they do help a lot and are worth the investment, IMO. I got mine from CFM and love it.


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

  4. #4
    Jr. Mechanic TUTONE's Avatar
    Join Date
    Apr 2009
    Southern Ohio


    I was looking at one from Airaid in an LMC magazine. Should come with all necessary hardware, or so it says. Just checked the one at CFM and it's about $20 cheaper. I like this little aspect,
    "- Each cylinder can now draw air from both throttle bores. Two hole straight and "helix" spacers can not flow as much air as our TBI Power Plates because they are only drawing air from one throttle bore! ". Sounds like the way to go. I've never heard of CFM Tech. before; thanks for the input.


  5. #5


    I ordered mine thought a local shop, checked 5 different warehouses, and i picked mine up for $120 CND. I noticed an increase in low end torque, and a little increase in gas mileage. In the long run, it will eventually pay for itself, so i would recommend you pick one up.
    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
    NGK Iridium Tips & MSD Ignition Plug Wires Baja Spare Tire Holder 33x13.5 Hankook rt03 18" XD Rims
    Innovate LC-1 Wideband o2 Sensor x2 HID's all around LED taillights and 3rd brake light
    BDS Dual Steering Stabilizers Pioneer Double-DIN Touchscreen Navigation with Two 10" Subs under rear seat
    Electric Fan Autometer Pressure, Boost, and Pyro Gauges
    4.56 Gears Airlift Air Bag Suspension

  6. #6


    I have the AirAID TBS. It does add a little more throttle responsiveness and maybe added some low end power. Overall, I think I may have gained 2 HP from it.

    On a side note, the AirAID one makes a whistling sound when the RPMs get high. It sounds cool, but after a while it gets annoying.
    2005 Chevy Silverado Z71 in Black

    6" BDS Suspension Lift | 3" BDS Body Lift |17" Rock Crawler Stellies | 35" Cooper STTs | 4.56 Yukon Gears | AirAid CAI and TBS | Flowmaster 40s | HyperPAC Programmer

    2001 TJ Sahara in Sienna

    3.5" RE Suspension Lift | 33x12.50 Baja MTZs | D30/44 | ROKMEN Merc Front Bumper | Warn Rockcrawler Rear w/ Carrier | Warn M8000 Winch

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