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Old 09-03-2007, 10:39 AM   #1
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Throttle Body Spacer

Is it true that it increases the gas mileage and that there is more torque at lower RPMs with it?

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Old 09-03-2007, 11:11 AM   #2
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Is it true that it increases the gas mileage and that there is more torque at lower RPMs with it?
Iv heard and read claims that it improved MPG A LOT but everyone iv talked to that installed one does not see a improvement.

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Old 09-03-2007, 11:34 AM   #3
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Yeah think Odhinn has one. Don't think it's made much difference.
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Old 09-03-2007, 01:22 PM   #4
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They are a complete waste of money. While they help under carburetors and throttle-body injected throttle bodies, they do nothing under the TJ's throttle body where the fuel is injected directly into the combustion chambers, well below the throttle body. In other words, only air passes through the TJ's throttle body. Making it taller won't help anything in the least except some spacers will add an annoying whistling sound.
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Old 09-04-2007, 02:10 AM   #5
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got one on my 4.0, didn't do nothing but cost me $80 bucks
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Old 09-04-2007, 02:22 AM   #6
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got one in my 2.5L I didn't notice any difference in HP. but man what an increase in throttle response.
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Old 09-04-2007, 11:35 AM   #7
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Although there is substantial proof they work for carb. applications, I do not believe this technology provides the same benefit to the throttle-body TJ platforms as Jerry has mentioned.

There are tangible benefits for carb. applications especially if the non-metallic spaceers are used. You can reduce heat transfer from the intake and that will help reduce the fuel temp. and minimze fuel boiling problems. Raising the carb. will also provide more room for fuel atomization and improve directional flow into the intake runners which can improve efficientcy.

Unless there is a certified dyno report (from a reputable 3rd party) I would not consider it.
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Old 09-04-2007, 06:01 PM   #8
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here is a good article on this subject. Its called 4.0L throttle body swap, but it also discusses the benefits of a spacer. http://www.creeperjeepers.org/thrott...dy%20swap.html
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Old 09-04-2007, 06:04 PM   #9
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I've seen some TBS that have spirals in them that cause the air to spiral. I don't know how this would help the engine or combustion but you'd think it would or they'd never sell any, right?
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Old 09-04-2007, 11:33 PM   #10
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the "spirals" are supposed to cause a vortec effect causeing the air to spin and enter the manifold faster. something like if you spin a pop bottle with liquid in it, the liquid comes out faster than if you just turn it upside down.
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Old 09-04-2007, 11:42 PM   #11
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^+ also since its aluminum its suppose to cool the air down or so i've heard.
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Old 09-04-2007, 11:47 PM   #12
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yup
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Old 09-05-2007, 12:50 AM   #13
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I just ordered one off ebay for $37, I'll tell ya what I think when its installed.
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Old 09-05-2007, 03:02 PM   #14
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I have a throttle body spacer with the cold air intake and I have not seen any difference in gas mileage. Its not worth it.
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Old 09-05-2007, 03:09 PM   #15
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Originally Posted by Warpman89 View Post
I've seen some TBS that have spirals in them that cause the air to spiral. I don't know how this would help the engine or combustion but you'd think it would or they'd never sell any, right?
Good marketing and effective target advertising can sell a lot of useless junk to many uninformed people.

This is a free country where I can sell as much stuff to as many people as I can get to buy it, as long as no one can prove that it causes danger or harm.
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Old 09-05-2007, 03:26 PM   #16
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There's a sucker born every minute.....

Like I said, show me a certified 3rd party dyno by a reputable comapany and I'm all over it. Otherwise it's simply snake oil.
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Old 09-05-2007, 04:24 PM   #17
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Quote:
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There's a sucker born every minute.....

Like I said, show me a certified 3rd party dyno by a reputable comapany and I'm all over it. Otherwise it's simply snake oil.
I remember "car and driver" did a dyno test and tests on many cars with that "tornado" krap. They had the tornado sellers there too. Simply enough the "tornado" didnt do anything neither on the dyno or the mpg tests. So the guy that was interviewing the sellers was like so its all just a lie? You are saying this product does so much difference and charging the people when in fact it doesnt do anything. The seller is like "on most cars we tested it on, it increased economy and power of the engine by nearly 10% and just on few cars it made a minor difference." So then the interviewer is like well why didnt it work on our vehicles. Then seller goes again.. It's because you guys must have installed them wrong, it worked on our vehicles."
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Old 09-05-2007, 08:03 PM   #18
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They are a complete waste of money. While they help under carburetors and throttle-body injected throttle bodies, they do nothing under the TJ's throttle body where the fuel is injected directly into the combustion chambers, well below the throttle body. In other words, only air passes through the TJ's throttle body. Making it taller won't help anything in the least except some spacers will add an annoying whistling sound.
So thats where the whistle came from. I did that spacer and cold air intake at the same time, and thought it was the intake making the whistle sound.
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Old 09-05-2007, 10:04 PM   #19
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Quote:
Originally Posted by Jerry Bransford View Post
In other words, only air passes through the TJ's throttle body. Making it taller won't help anything in the least except some spacers will add an annoying whistling sound.
The concept is since its under the throttle body (and the butterfly wont stop it). It spins the air so spinning air is easier to bend through the bends in the manifold vs air going in one turbulant single streak.
Also putting a spacer between the throttle body and the intake will slow down heat transfer to the throttle body so the air wont be passing through a "hot door"

Quote:
Originally Posted by "W4MAC" View Post
So thats where the whistle came from. I did that spacer and cold air intake at the same time, and thought it was the intake making the whistle sound.
The CAI just opens up so you can hear the intake side of the engine louder. The spacer makes the whistle or as in my setup i have a bored out throttle body which also makes whistling sound at a specific position. I find the whisling sound quite suthing.
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Old 09-06-2007, 02:35 AM   #20
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I read something somewhere recently concerning alot of different aftermarket parts. Most parts easily bolted on all claim around 10hp. (intakes, exhaust, tb spacers, tornados, etc..) this also happens to be from what I read the amount of error a dyno is allowed to have and still be considered accurate. Now that being said, if you do all of these upgrades I believe you'll see an increase in power, or fuel economy. Or at least I hope so because I'm a sucker and will I'm sure spend hundreds of dollars on my tj just to see....
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Old 09-06-2007, 09:29 AM   #21
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I have one made by airraid on my TJ with the 4.0l. It seemed I got a little more pep( or I could be crazy and not want to admit to myself got ripped), but no noticeable mpg gains. I can't really say if it is worth the cash or not. I just left it on since it didn't seem to hurt my engine or anything.
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Old 09-06-2007, 01:48 PM   #22
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Waste of money... I'll give mine to anyone willing to give me the the regular bolts that goes into the TB...
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Old 09-06-2007, 07:39 PM   #23
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Do they work? Simple question and a lot of answer.

Yes the do/don't, kinda, sorta, maybe DEPENDING on lots of factors.

The principal is it gives you longer runners, thus the air intake velocity is increased.

That said it has already been done. Jeep modified the intakes on the 4.0L sometime ago, I am not sure when, but a few years back. And if you own a Jeep that is later than about an '03 then you already have the intake with lengthened runners.

On today's Jeeps about the only thing they do and they do it VERY well is separate $$$ from your wallet.

Spirals: Some of them have spiral groves cut into them with the sales pitch that this will cause the air to spin and thus you get a better charge.

Pick on up in your hand and look at it and the spirals and ask yourself if a column of air can be spun using those small spirals inside the device. If you believe they can then go buy one of those Tornado thingys it will help too.

All that said do they work? Anyone here remember "Man-a-free" or Hilborn injector systems for racing engines. If you do you remember that they came will some rather long intake tubes which you could cut to the length you needed as you tuned your engine. The length of runners has a impact upon HP/torque curves. Just like the length of the exhaust runners.

Bottom line: Adjusting the length of intake and exhaust runners does indeed have an effect. But to optimize this effect each INDIVIDUAL runner needs to be tuned and simply adding a spacer under the throttle body may or may-not help. In either case the degree of help or non-help would be at best miniscule. Don't waste you money or time.
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Old 09-13-2007, 05:10 PM   #24
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Installed it 2 days ago, heres the results.....

It sucks. No help to anything. Taking it off in an hour.
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Old 09-13-2007, 05:35 PM   #25
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I've heard this form the head Jeep tech at the dealer ship i work at over and over again. I now believe it for myself after having 4 jeeps and wasting a lot of money.

The 2.5L will never be powerful for less mooney than the swap of a 4.0L
The 4.0L has little improvement for powergains.

Both motors can be beefed up for added reliability and toughness, ie like a cast manifold to steel header upgrade.

But on a TJ the computer controls so much, yes you can make it breathe better, but eventually in the end you end up wiht a bunch a of shiny mud covered parts.

I got tired of braggin rights about 2 jeeps ago. My wallet bared the brunt of my mistake.

Now I make plans.

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