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Old 09-19-2010, 11:02 PM   #1
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Throttle body

Are throttle body spacers worth the money? I had one on a 98 2 door tahoe with 38 inch super swampers and did notice I difference in horse power and mpg ( barely) but 6-7 months down the road it stopped working. Just wondering how they run on 4.0 jeeps? And are they worth it if you have exhaust and kn intake and a chip already. I read that the chip works better with other mods

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Old 09-19-2010, 11:18 PM   #2
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Any performance mods like that don't do a da#% thing to help the 4.0

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Old 09-20-2010, 12:07 AM   #3
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I beg to differ, I'm getting 15-16 mpg in mine and she flys. Indiviually I don't think they do but all together on that 6 cyl they do help, noticeably..In my opinion
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Old 09-20-2010, 12:24 AM   #4
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I am too and mine is bone stock
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Old 09-20-2010, 12:34 AM   #5
Knows a couple things...

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Spacers don't do a thing when installed under the air-only type of throttle body the TJ uses. Spacers can do wonders when mounted in a "wet" (air & fuel mixture) environment like under a carburetor or the old (no longer used) style of TBI (throttle body injection) throttle body when there was actually a fuel injector on the throttle body injecting fuel.

The TJ's throttle body is a newer design that only passes air through it, all the fuel is injected well below the throttle body in the intake manifold so making the air path longer between the throttle body and intake simply does nothing.

Those who report gains in their TJ engines with TB spacers are only victims of the placebo effect.
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Old 09-20-2010, 07:31 AM   #6
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Agree ... I tried, believe me at 16.4 MPG on my 4.0 engine, I tried to increase MPGs by using the throttle body spacer and bored out throttle body. No increase from stock MPG.
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Old 09-20-2010, 08:36 AM   #7
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But - if you put the 18" STP stickers on the doors and hood, AND paint your wheels fluorescent PINK, tint the widows really dark, and wear dark sunglasses at night, it helps people believe the spacer works.
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Old 09-20-2010, 11:17 AM   #8
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I have a 4.5 inch lift with 33's and felt the horsepower difference. I can drive 80+ no prob. No down shifting up inclines. Still have yet to regear also. But yeah that's what I thought guys. It says to cool the gas, might not work if none runs threw it. Duhh (common sense) ha thanks!
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Old 09-20-2010, 11:26 AM   #9
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Look if addig a $10 chunk of aluminum under a throttle body actually increased mileage (or HP) every vehicle would come stock with such a fitting.

If it ACTUALLY gave you 5 hp, 5 hp is not something that could be felt and guaged via the butt dyno.

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