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Old 08-26-2014, 10:37 AM   #1
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Throttle body spacers...

Anyone have any input on whether they are even worth it? Seems like it can't make a big difference

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Old 08-26-2014, 10:44 AM   #2
Knows a couple things...

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Throttle body spacers are worthless when installed under the modern type of throttle body the TJ has which only has air passing through it.

Spacers can really help with older technology like carburetors or the old no-longer used TBI (throttle body injection) systems which pass an air-fuel mixture but not with a modern air only throttle body.

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Old 08-26-2014, 11:59 AM   #3
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+1 for Jerry's comment

Finally did some solid research on the science behind intake manifolds:

I have a TB spacer on my 4.0L. It was installed because I was young and had some money to play around with the power-train (wasn't thinking about lifts or anything, just a daily driver). TB Spacer does absolutely nothing other than create a 'whistle' when the intake manifold falls with in a very particular bracket of vacuum where the TB spacer creates a vortex, much like water swirling down a drain or a tornado funnel, or straightens air just after the TB spacer. That's where the fun stops.

The marketing Bacon Strips will tell you that the vortex or straightening helps deliver the air more efficiently to the cylinders to improve HP, TQ, MPG... LIES. The only time a spacer will help is on intake manifolds that are too restrictive for the stroke and bore of an engine. What that means is the engine needs a larger air reserve in the intake manifold so more O2 is available.

The 4.0L: the intake on this monster is already maxed. There exists a massive (propably 2-3 cups worth of air) plenum reservoir just after the TB. This reserve of air in addition to the 6-8 inch long runners leave plenty of O2 ready for consumption. IF a super charger or turbo was installed and you have an upstream fuel injector, only then might the 4.0L benefit from a spacer (adding more reserve air+fuel).
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Old 08-26-2014, 01:52 PM   #4
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you would benefit more from an intake manifold spacer, but even then I don't think you'll see much.

Where you can really see gains with a throttle body spacer is if you have an ITB setup (individual throttle bodies in case you don't know what ITB's are)

The reason for that is the spacers increase runner length which allows you to take advantage of the helm holtz theory - which basically means at the right RPM frequency (tuned by you / runner length) you can actually achieve above 100% volumetric efficiency.

Air traveling down the runner hits the intake valve as it is closing and resonates back up the intake tract hitting the next "wave" of air coming down...(think similar to water waves here) this causes the waves of air to double on their way back down into the open valve this time.

of course this generally only applies to 1000 rpms inside your powerband. If you are able to tune it right you can actually get 2 short power bands with this...but again, you need an ITB setup to benefit.
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Old 08-26-2014, 02:47 PM   #5
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Looked into ITB setups... the thought of a 4.7L stroker on ITB tickles me
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Old 08-26-2014, 03:36 PM   #6
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Quote:
Originally Posted by Fuzzra99 View Post
Looked into ITB setups... the thought of a 4.7L stroker on ITB tickles me
They are nasty setups- finicky to tune, but just down right nasty. But also not ideal at all for a jeep that will be going offroading. I mean, you can get filters for each stack, but I wouldn't want to run that in the bush lol
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Old 08-26-2014, 06:28 PM   #7
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Thanks!! You just saved me some money!
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Old 08-27-2014, 07:47 AM   #8
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Letzride - Yea I noticed ITB performs better w/o filters being that the entire idea is minimizing airflow resistance. I wouldn't knowingly subject a finely tuned high performance engine to any off road dust.

Jrod9686 - No problem. Use that money for safety/recovery equipment or save up for any other major mod
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Old 08-27-2014, 08:09 AM   #9
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Quote:
Originally Posted by Fuzzra99 View Post
Letzride - Yea I noticed ITB performs better w/o filters being that the entire idea is minimizing airflow resistance. I wouldn't knowingly subject a finely tuned high performance engine to any off road dust.

Jrod9686 - No problem. Use that money for safety/recovery equipment or save up for any other major mod

Well, filters won't make a massive difference in the performance, but my main concern was all the filters I have seen for those are not the best. Actually for the most part I think they tend to keep out bigger particles and not so much dust. Second to that the filter area as a whole might be bigger than the area on our filters, but, they are tiny on each throttle body, so I feel like they would easily clog more so on 1 throttle body a lot faster...you'd probably need to change them monthly or sooner.

I still have my bike throttle bodies I broke down for my custom ITB setup on my old camaro which ended up not happening...maybe I'll build a unit for the LS
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Old 08-27-2014, 08:16 PM   #10
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I have an Airaid on mine. I might have gained some low end power from it, I'm still skeptical of that I think it's my mind wishing I had bigger gains. Really all it does is whistle around 2200 rpm and I think it actually hurt my gas mileage by 1 or 2 mpg. Not really worth it but I have it now so it's staying on.

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