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post #1 of (permalink) Old 07-28-2003, 08:07 PM Thread Starter
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TB Spacer worth doing?

Is the benefit of a Throttle Body spacer worth the cost on a 4.0L?
Can anyone explain how it's supposed to improve HP, torque, and milage?
Someone makes one with spirals in the bore saying the spiral air flow is where the performance improvement comes from. Is that true? Would a home made 1" alum spacer with a straight bore improve performance?
If a train leaves Chicago at 3:30AM and travels West at 120MPH, when would the Bear poop in the woods? Would a spacer help me drive through it?
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post #2 of (permalink) Old 07-28-2003, 08:19 PM
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Re: TB Spacer worth doing?

I have a Poweraid T.B. spacer on mine and there is a power difference all be it a small one. I will be doing like RioGrande did and replacing it with a T.B. and spacer from a 4.0L which I have heard makes a big difference.
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post #3 of (permalink) Old 07-28-2003, 09:46 PM
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Re: TB Spacer worth doing?

It's part hype, part fact.
The extra space under the throttle body increases the plenum area but only slightly. That can improve throttle response and a tad more HP - a tad.
The spirals help at mid range R's - they help keep the mixture atomized. At lower end R's they are useless as the air's not going fast enough.
And at high end the spirals can cause too much turbulence, actually restricing airflow.

OK, that might go against the advertising. But it's my observations on dynos.

And - they work on carburetors and throttle body injection only -- not on port fuel injection.
If the fuel's injected into the airstream before the spirals, it atomizes. But port injection it just swirls the air restricting it, then by the time it gets to the injector at the cylinder the swirling's stopped.
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post #4 of (permalink) Old 07-29-2003, 02:01 PM
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Re: TB Spacer worth doing?

I do not have a dyno, and since I installed mine with my throtel body I cannot say what it really did for mine. But Tater if you want to try mine sometime, I will loan it to you, Because I have been wanting to run mine without it to explore what RRich is talking about. See if there is a diffrence.
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post #5 of (permalink) Old 07-29-2003, 02:10 PM
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Re: TB Spacer worth doing?

Jeff can you run the 4.0L T.B. without the spacer will it fit?
John
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post #6 of (permalink) Old 07-29-2003, 02:20 PM
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Re: TB Spacer worth doing?

My guess is the difference you notice will be psychological. If it actually gave you 5 additional HP, would you be able to feel it, probably not.
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post #7 of (permalink) Old 07-29-2003, 10:10 PM
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Re: TB Spacer worth doing?

Wa John It will bolt right up just use your sensors.

I just want to see if there is a diffrence between with and without.
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post #8 of (permalink) Old 07-30-2003, 01:53 AM
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Re: TB Spacer worth doing?

I haven't run mine on a dyno - yet.
But I have done before and after tests on other cars, TBI and carbed, on chassis dynos. Sometimes it helps quite a bit, sometimes not much.
Partly it depends on how bad the intake was before adding it. If it wasn't keeping the fuel atomized enough it'll really help. Sometimes figures get distorted because at the same time it's added, adjustments/improvements are added to ignition or something else - which really helped?

Seems like I've seen 20 HP improvement sometimes, and sometimes nothing.

Somewhere around 5 hp is where your seat of the pants start feeling it. Of course on a 600 hp motor 5 isn't enough to notice, but on a 100 hp it's significant.
The Jeep's 4.0's are around 180-193 - so 5 is right on that edge.

I added the "Rock-it" airbox eliminator with the K&N, it's supposed to add 5-8 hp. I definately can "feel" that. Not a bunch, but it does help.

I have the smooth bored Port Injected spacer, it's supposed to add more too - it's awful thin, maybe 3/8" thick. I can't believe so little can make a difference, but we'll see. I haven't put it on yet, I'll advise when I do.

Too bad there isn't a little trick or an easy bolt-on that'll give another 200 HP, that would make it fun!
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