Just want to let people know that I fixed the problem. It works great now. I had a spacer facing backwards instead of forward. That was the problem. Now I can really feel the differents. R T rules!! Go 5.9
it will work on fuel injected engines as well. the major difference, though, is that the newer engines are port injected, not throttle injected. what the spacer is supposed to do is to make better atomization of the fuel and air mixture. well, in a port injected engine, the fuel is delivered directly to the cylinders, bypassing the intake, it separates the air and fuel mixture until it gets into the cylinders.
Like mentioned above.. port injected motors spacers = paperweights, this includes the 4.7L .. only thing they do is make a cool whistling noise.. LOL
the point of the spacer is to create a 'swirling' effect, better mixing the air/fuel, for a better burn. so.. common sense would state that, if the fuel is not part of the mixing equation until already in the cylinder.. what good is the spacer doing way the heck up on the TB ?? .. there ain't no mixin' goin on' there..
Just a point of reference, I installed an ebay t-body spacer on my Durango (03 RT).
My seat of the pants dyno doesn't feel any different BUT, my gas mileage has improved nicely. Pre-spacer I averaged 11.2-11.4. After the spacer install I average 12.4-12.6. (both averages consisted of at least 3 full tanks of gas).
I am real glad that I read this thread. I have been debating about spcers on e-bay for a while, for a cheap upgrade. I think I will just wait now. By the way check out the avenger that I built when I got back from the desert last time. It looked real sweet, but ran like a$$.