im not completely disagreeing with that, just that i thought it felt better response

 

I wheel with my jeep in its current form which is stock so i have to watch out with what i do but eventualy it will be armourd and lifted. right know i am focusing on better mpgs and performance mods since it is my dd and i do drive it to the shore alot which is 108 miles each way

 

What is your thought process on this on an XJ? This is what I see. After the cable leaves the cable mounting bracket (the one that bolts to the intake manifold) it takes a middle dive toward the TB. So raising the TB would actually give more slack in the cable. Unless you raise the mounting bracket, which leaves the geometry between the mounting bracket and TB the same. Yes some TB spacer just increase the volume (have smooth sides on the spacer, these I can see as being a junk or waste of money).

 

well what about ones that attempt to swirl the air for the attempt to better atomize air and fuel mixture

try this :http://www.ehow.com/how-does_5031942...acer-work.html

 

Thats the kind I've got. Like I stated, I could definitely see a difference on the freeways.

 

I did some more searching - at least one other reviewer noticed some improvement with throttle body spacer using the smooth bore instead of the textured bore.
read here

"To make a couple of final points, I originally installed a throttle body spacer on this Jeep as an experiment. It proved to be worthwhile in that I got a minor increase in fuel mileage, but better yet, by the seat of my pants, the throttle body spacer also removed a slow speed, stomp on the gas flat spot or hesitation that I had. When we tested the AEM Brute Force system with and without the AEM throttle body installed, the results were similar to my previous spacer and the stock intake. The flat spot came and went with the spacer. The dyno did not show any increase or decrease in performance with or without it installed but PFI also supported the seat of my pants and fuel mileage results based on their experience. For article completeness I have included a comparison of the spacer I was using to the AEM spacer below. AEM stated that they found no difference using a fluted spacer over a smooth one, and at this point I must concur with their findings."