Page 1 of 7 123 ... Last
  1. #1
    TerryMason's Avatar
    TerryMason is offline Administrator
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    6,364

    Do throttle body spacers really work?

    I've heard alot about throttle body spacers over the years, but I'm not sure I understand or believe alot of it.

    Unless the factory installed a spacer in there that was purposley restricting airflow I don't see how raising the trottle body up 1/2 inch would help. The "cyclone" thing just sounds like marketing talk to me.

    Am I way off? Would a throttle body spacer do anything for my 4.0?

  2. #2
    Dry suit diver's Avatar
    Dry suit diver is offline Senior Member
    Join Date
    Aug 2006
    Location
    London
    Posts
    106

    Re: Do throttle body spacers really work?

    Quote Originally Posted by TerryMason View Post
    I've heard alot about throttle body spacers over the years, but I'm not sure I understand or believe alot of it.

    Unless the factory installed a spacer in there that was purposley restricting airflow I don't see how raising the trottle body up 1/2 inch would help. The "cyclone" thing just sounds like marketing talk to me.

    Am I way off? Would a throttle body spacer do anything for my 4.0?
    some 4 litre owners over here have reported better oomph when accelerating but that may be the placebo effect. the only true way to test is get it on a dyno.


    or write to myth busters
    some are born weird , others have weirdness thrust upon them

  3. #3
    Bounty__Hunter's Avatar
    Bounty__Hunter is offline Moderator
    Join Date
    Nov 2002
    Location
    Southern Illinois
    Posts
    12,730

    Re: Do throttle body spacers really work?

    I think they work, and most are 1" tall.

    The biggest improvement is from 62mm throttle bodies, which I happen to sell, cheap. I use one on my 2.5L in conjunction with a 62mm spacer.

  4. #4
    jeepster357's Avatar
    jeepster357 is offline Member
    Join Date
    May 2008
    Location
    Lakewood, Co.
    Posts
    75

    Re: Do throttle body spacers really work?

    I use the Airaid cold air intake along with the Throttle body spacer, I cant quote you numbers but judging from my seat dyno (seat of my pants) my 4.0 does seem to have more oomph. I have noticed haveing to down shift less on steep grades and I did gain around 1-2 mpg's. And there is a added bonus of a little bit of a "growl" that comes from the air intake. cool.

  5. #5
    Heydace's Avatar
    Heydace is offline Junior Member
    Join Date
    Jan 2007
    Location
    Massachussetts
    Posts
    22

    Re: Do throttle body spacers really work?

    They do work, you may feel a slight difference (or not). The theory behind them is that they atomize fuel molecules better than the stock t-bore and intake. I would opt for a larger t-bore and air intake system (K&N or similiar) then open up the exhaust to allow for the increase in air intake. You want a smooth flow of air in and exhaust out.

  6. #6
    TerryMason's Avatar
    TerryMason is offline Administrator
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    6,364

    Re: Do throttle body spacers really work?

    I can understand a cold air intake making a difference, but I haven't bought into the spacer yet.

    For $5 Chrysler could make these parts themselves. If they really did give a 1 mpg fuel savings, that would be a 7% fuel savings - why wouldn't Chrysler want this?

    I'm gonna go ahead and buy one and put my money where my mouth is. I've kept great milage records to date, so I'll let everyone know what I find out.

  7. #7
    jeepster357's Avatar
    jeepster357 is offline Member
    Join Date
    May 2008
    Location
    Lakewood, Co.
    Posts
    75

    Re: Do throttle body spacers really work?

    When I installed my TBS it was in conjunction with the new intake so I cannot vouche for the TBS as a stand alone upgrade. I do know my mileage and performance has increased slightly over stock though.

  8. #8
    PA-XJ2's Avatar
    PA-XJ2 is offline Junior Member
    Join Date
    May 2008
    Location
    Dindmans Ferry PA
    Posts
    8

    Re: Do throttle body spacers really work?

    hey, i think they work i had one on my 90 XJ (renix motor) and i could def notice a difference on take off.
    -Ant

  9. #9
    Bounty__Hunter's Avatar
    Bounty__Hunter is offline Moderator
    Join Date
    Nov 2002
    Location
    Southern Illinois
    Posts
    12,730

    Re: Do throttle body spacers really work?

    Terry, any update?

  10. #10
    TerryMason's Avatar
    TerryMason is offline Administrator
    Join Date
    Dec 1999
    Location
    Virginia Beach VA
    Posts
    6,364

    Re: Do throttle body spacers really work?

    I've got the spacer, but with all this good fishing weather, I haven't had time to install it.

  11. #11
    Bounty__Hunter's Avatar
    Bounty__Hunter is offline Moderator
    Join Date
    Nov 2002
    Location
    Southern Illinois
    Posts
    12,730

    Re: Do throttle body spacers really work?

    Keep in mind that power and mileage may improve over the course of a week or two after install, giving the computer time to adjust to the change.

  12. #12
    CyberJeepEric's Avatar
    CyberJeepEric is offline Junior Member
    Join Date
    May 2008
    Location
    Pompano Beach, Florida
    Posts
    26

    Re: Do throttle body spacers really work?

    We sell the Airaid Throttle Body Spacers, usually along with an intake. Most of our customers agree that there is a noticable increase in torque from the combination. However, we have also received the feedback that after a while, a month or two, that the computer actually re-adjusts itself to compensate for the aftermarket products. At which time both the power and mileage gains are lost, in theory anyway. I have heard that disconnecting the negative post of the battery overnight will reset the computer and get the improvements back again. I stress that this is all in theory. In our 2007 Wrangler Unlimited Rubicon, the improvements have never seemed to diminish. However, we don't drive it a whole lot and with 37's who is checking gas mileage?
    Eric Gajewski
    Director of Marketing
    Morris 4x4 Center
    Jeep Parts and Accessories
    www.jeep4x4center.com
    sales@cyberjeep.com

  13. #13
    ursman's Avatar
    ursman is offline Member
    Join Date
    Aug 2008
    Location
    Aurora, CO
    Posts
    48

    Re: Do throttle body spacers really work?

    Quote Originally Posted by PA-XJ2 View Post
    hey, i think they work i had one on my 90 XJ (renix motor) and i could def notice a difference on take off.
    -Ant
    Just curious as to where you were able to find a TBS for a Renix system. To the best of my searching, I've been unable to find one.
    '89 YJ, Howell TBI, 35"s, Lock'd & Load'd

    Build it, Wheel it, Break it, Repeat

  14. #14
    03_Rubicon's Avatar
    03_Rubicon is offline Junior Member
    Join Date
    Feb 2008
    Location
    Michigan
    Posts
    16

    Re: Do throttle body spacers really work?

    I bought the Air Raid 1" spacer for my 03 rubicon, and I immediatly noticed an increase in HP while accelerating. For what it costs....I would recommend it, and it is a snap to install.

  15. #15
    Bounty__Hunter's Avatar
    Bounty__Hunter is offline Moderator
    Join Date
    Nov 2002
    Location
    Southern Illinois
    Posts
    12,730

    Re: Do throttle body spacers really work?

    Quote Originally Posted by ursman View Post
    Just curious as to where you were able to find a TBS for a Renix system. To the best of my searching, I've been unable to find one.
    Hesco Inc. - High Performance Engine Service has the 62mm throttle bodies, plus adapters to use newer HO TB's on the Renix intake. Another option is to use a HO intake and TB, and just modify the TPS. While you're at it, use a HO head for the best gains, along with a '99+ intake with equal length runners.

  16. #16
    ursman's Avatar
    ursman is offline Member
    Join Date
    Aug 2008
    Location
    Aurora, CO
    Posts
    48

    Re: Do throttle body spacers really work?

    Quote Originally Posted by Bounty__Hunter View Post
    Hesco Inc. - High Performance Engine Service has the 62mm throttle bodies, plus adapters to use newer HO TB's on the Renix intake. Another option is to use a HO intake and TB, and just modify the TPS. While you're at it, use a HO head for the best gains, along with a '99+ intake with equal length runners.
    That's good info to know. Thanks!
    '89 YJ, Howell TBI, 35"s, Lock'd & Load'd

    Build it, Wheel it, Break it, Repeat

  17. #17
    avan's Avatar
    avan is offline Senior Member
    Join Date
    Sep 2008
    Location
    Braunston - United Kingdom
    Posts
    378

    Re: Do throttle body spacers really work?

    Personally I think that there will be no added advantage of a TBS. By increasing the distance from the fuel/air mixture from reaching the combustion chambers you are actually creating a mirco-second lag to a trottle response. If any affect is to be felt the increase of air verlosity should be before the carb, i.e a turbo-charger

    My 2 cents worth

  18. #18
    ursman's Avatar
    ursman is offline Member
    Join Date
    Aug 2008
    Location
    Aurora, CO
    Posts
    48

    Re: Do throttle body spacers really work?

    Quote Originally Posted by avan View Post
    Personally I think that there will be no added advantage of a TBS. By increasing the distance from the fuel/air mixture from reaching the combustion chambers you are actually creating a mirco-second lag to a trottle response. If any affect is to be felt the increase of air verlosity should be before the carb, i.e a turbo-charger

    My 2 cents worth
    I have no idea where you've seen evidence that adding a TBS will cause "micro-second" lag. Simple physics shows that adding volume, in this case air/fuel increases power. There isn't any lag. Even if there was, we're talking about Jeeps not race cars.
    '89 YJ, Howell TBI, 35"s, Lock'd & Load'd

    Build it, Wheel it, Break it, Repeat

  19. #19
    avan's Avatar
    avan is offline Senior Member
    Join Date
    Sep 2008
    Location
    Braunston - United Kingdom
    Posts
    378

    Re: Do throttle body spacers really work?

    A "quote" from another "car forum" from a group at an engineering college

    I" can't stress this enough: under *controlled* circumstances with a 350 cid Chev motor producing 180 hp and every engineering student submitting a design. NO measurable hp or fuel economy gains were recorded at under approximately 1 meter. This was using an assortment of aftermarket products as well as the shop designs. It did lead however to massive throttle lag.
    A long straight tube on the air side of the carb or TB with no vanes, few bends, no internal sources of turbulence, a cold air source and a large, quality paper element returned the best HP and fuel economy gains without modifying the mechanics of the engine."

    PS we have both turbo-charged and super-charged Jeeps in our 4x4 club

  20. #20
    avan's Avatar
    avan is offline Senior Member
    Join Date
    Sep 2008
    Location
    Braunston - United Kingdom
    Posts
    378

    Re: Do throttle body spacers really work?

    And yet another 4x4 forum quote:


    Throttle Body Spacers (Primarily the "Helix" style):
    These spacers do not provide any gains in HP at all. They claim to increase TQ and MPG but we tested one and it gained nothing. The Dyno showed no gains in HP or TQ. We also had contacted one of the manufacturers for their comments on them and here's the direct quote (from email):
    --------------------------------------------
    From: AirAid Info
    Subject: Re: AIRAID.COM Contact

    Dear Sir, thank you for your inquiry in our products. The spacer makes no HP on the Dyno. It makes all of it's power in torque in the low end. If you haven't noticed any power on the Dyno or the track then it's doing what it's supposed to. You would not see any gains down the 1/4 mile or increases on the Dyno. The idea of the spacer is to improve overall drivability and fuel mileage. In most cases when people install a bolt on part they expect better mileage and power, what happens is they are into the throttle a lot more than before trying to test performance and that's when the decrease in mileage happens.
    Sincerely,
    <Airaid Technician>
    -------------------------------------------
    Points to look at:

    "The spacer makes no HP on the Dyno. It makes all of it's power in torque in the low end."
    "If you haven't noticed any power on the Dyno or the track then it's doing what it's supposed to."
    "The idea of the spacer is to improve overall drivability and fuel mileage."
    So...it doesn't make any more HP, is not supposed to help in 1/4 mile performance (or on the Dyno), and is mainly for mileage and bottom end Torque. Well, Dyno's show TQ figures and there were no changes, mileage stayed the same, and 1/4 mile performance wasn't affected on the several others who have tried it"

Page 1 of 7 123 ... Last

Similar Threads

  1. Throttle body spacers
    By RompIT in forum General Chat
    Replies: 15
    Last Post: 02-24-2014, 01:17 PM
  2. 62mm throttle body for '91+ 2.5L and 4.0L jeeps
    By Bounty__Hunter in forum Items for Sale, Trade, or Give Away
    Replies: 5
    Last Post: 05-05-2008, 12:23 PM
  3. throttle body spacers
    By blown XJ in forum Cherokee, Commander, Wagoneer and Liberty
    Replies: 7
    Last Post: 02-15-2007, 12:54 PM
  4. Throttle body spacer
    By kd5uwg in forum CJ YJ TJ and JK
    Replies: 5
    Last Post: 01-29-2006, 12:56 PM
  5. THrottle body spacers?
    By BiohazardYJ in forum CJ YJ TJ and JK
    Replies: 21
    Last Post: 03-01-2005, 03:35 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Log in

Log in