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  1. #1
    Jr. Apprentice SGT_Z85's Avatar
    Join Date
    May 2009
    Fort Rucker, AL

    Default Throttle Body Spacer

    Can someone please tell me what exactly the perpose of a TBS is? Will it add HP, torque or MPG? If so, how hard are they to install? Does brand matter? Do they come in different spacer sizes? I have a NBS 07 with the 4.8 and Magnaflow exhaust if that makes a difference. I see them posted on the list of mod's that most people have, so I figure they've gotta be somewhat useful, I just dont know what they do.

  2. #2
    Master Mechanic
    Join Date
    Apr 2009
    Owens Cross Roads, Alabama


    from what ive been hearing theyre worhless.but i cant speak from experience, ive never tried one.from what i understand they worked great on older motor where the fuel was sprayed before the you had a mixture of aire and fuel..BUT..with motors these days all they do it is making a whistling noise because the only thing flowing through them is air.i may be wrong but thats what ive been hearing
    2004 Silverado 4x4
    1986 K5 Blazer
    8" Superlift w/39.5 super swampers
    1992 GMC Jimmy "Blue Bomber"
    4.3L Vortec

  3. #3
    Master Mechanic daddytech's Avatar
    Join Date
    Mar 2008
    Portland TN


    My wife's 98 Suburban has one of those on it. she averages about 3-5 mpg better than my tahoe that does not have one. However, My tahoe has more power. Both trucks have TBI 5.7 L engines. both have K&N air filters, E3 plugs, and both are run on Mobil 1 oil with the lucas addative. hers differs in that it has a mega light aluminum drive shaft on it. mine is steel, that may help with the mileage on hers too but aside from the obvious thing of hers being longer with the 3rd row seat and the TBI spacer the trucks are identical

    that's what i noticed similarity and difference wise. aside from a couple more MPG difference that's it of course now keep in mind also my truck only has 140,000 and hers because of all the highway miles she has to drive to work every day has 218,000 on it right now. her trans was rebuilt last july, mine has not been yet.

  4. #4


    They are good for a cool sound that is all. On a nbs chevy they are a waste of money. They make no difference on the dyno what so ever.
    08 silverado
    K&N cai
    single in dual out cherry bomb pro
    leveling kit
    custom painted bow ties
    Bed liner
    Tinted windows
    20inch Cruser Alloy Switchblades
    Goodyear Eagle GT2 285/50/20
    1 truly heavy foot + Wait4meperformance SCT Handheld
    100 shot of Nitrous Dyno tune system
    SS front bumper
    Matching painted front grill and bow ties

  5. #5


    I had one on my '89 4.3L back about 6yrs ago in high school. All I remember is being very disappointed, no improvement in gas mileage (factor in 17y/o behind the wheel, it would cancel out even if the mileage had improved) and no noticeable power gain.

  6. #6
    Legend bry2500's Avatar
    Join Date
    Oct 2008
    Gloucester, MA
    Blog Entries


    They sound cool but are of no real added value to a newer truck. The air flow gets disrupted causing turbulence which produces heat, which inturns reduces the density of the air reducing the air charge, contributing to more fuel than air which decreases mileage.

    Thiat is my take on throttle body spacers.


    02' Avalanche 2500 Onyx Black
    8.1L Vortec
    43,000 miles

  7. #7


    They are supposed to increase the airflow and produce more power. Like others have said they are a waste of money on your Chevy. Save your money for a nice exhaust system.

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  8. #8


    I really like my Street & Performance Electronics TBS!!! I had a PowerAid but I didn't like it..

  9. #9


    do any of you that said they were worthless have or had on on your truck?? i have one on my truck, and before i put it on i was getting 19mpg, now im getting 21.5 mpg on the highway. also noticed a little more torque

  10. #10


    they could only make a difference on tbi engines. i was told they were supposed to agitate the air and fuel making a more complete mixture. but that is only supposed works on TBI engines.

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