Does anyone have one on? Do you see a good improvement? and in what?

 

I bought one last summer and saw absolutely no improvement whatsoever. I saw better throttle response with a K&N drop in filter, and that wasn't much at all.

 

how come the jk's respond so bad to add ons? theyr there to improve.

 

Not a Jk expert, but I would say its due to the motor being a v6, and NA. Its not a v8....but similar in the sense of if you want to make more power, the only real way to do so with out adding a supercharger or turbo, is to do heads, cam, and exhaust. But I dont know if there are aftermarket parts for the items that I mentioned.

 

Yeah but people are getting 350hp and more from 4 cylinders. i dont get it why is it so hard to do it with our jk's?

 

Naturally aspirated? And without running it at 7k+ RPM?
Jeeps are supposed to be for low end crawling, not hyperventilated racing.

 

Thats true, can't argue that, but atleast when you buy something to increase power it should. but your point is rite.

 

I had the TBS (got it free w/ my Airaid) but immediately sold it on eBay for $70. Everyhting I've seen is that they do nothing on a fuel injected engine, so I didn't waste the effort installing it. Plus it meant I essentially got my Airaid new for about $150.

 

This has nothing to do with the throttle body spacer, but you asked why the JK responds poorly. Simple. The engine is a 60 degree V6. Had it been a 90 degree V6, it would have been a tire scorcher. Spanning the banks farther apart has a tremendous affect on torque output.

 

Spacers work well on a throttle body injected engine, but their signal is very similar to that of a carbureted engine. Like you, I completely agree they are totally useless on the JK.