I just wanted to clear this up. Isn't the only purpose of a smaller pulley is to make more boost? I know it sounds like a silly question, but I have to ask.

Yes. But in order to make the engine handle the extra boost, you have to let it flow better by doing at least a cold air intake, 3" D/P (w/ U-Bend delete), a 180* thermostat, and a new PCM. Otherwise there will be too much knock retard and it could damage your engine...

Yeah, I have all of those done, including colder plugs and flipped Swaybar. Is it possible to get more KR by having those mods with a 3.8" instead of a 3.4"/3.5"?

The bigger the pulley the less chances of KR.

By the way Luis did you get those tips?

No, that's not possible. A smaller pulley is going to cram more air into the cylinders for combustion. A smaller pulley will ALWAYS have more KR than a larger pulley with everything else constant.

I haven't received them yet, did you get a tracking number?

I ask because I read that sometimes too much fuel can also lead to KR. So suppose I have a PCM and stock pulley, the PCM is set up to provide more fuel. I know I was getting a lot of KR even when I had a 3.8" and "supporting mods". But I do know that a lot of it had to do with my very high IAT's. Regardless, I'm trying to put it back to stock.

My wife sent them through the post office. That was on the 10th. She insured them. If you don't get them in a few days PM me I'll give you the label number.

Ok cool. Thanks.

Do you have to flip the swaybar when getting a new DP? Is it easy?... can anyone explain what it is to me.

Hmm that is not something I've ever heard or read about. It kind of makes sense.

Never heard of "Too much fuel creating KR". Not saying it's not possible, but by dumping too much fuel, you're just running rich.
KR happens when extreme temperatures, or hot spots occur in the combustion chamber causing the air/fuel mix to prematurely ignite(detonation). Detonation also happens when using a lower octane fuel because a lower octane burns faster and easier.... In a high compression environment it ignites prematurely. When the engine detects detonation, it backs off the timing(KR).
So, to answer your question I think you had other issues besides too much fuel.

To little fuel is a more likely cause of KR. Usually not a problem with aftermarket PCMs, as they've corrected problem areas for lean fueling and done a few things to try and kill KR (like gives an extra splash of fuel the instant you romp the pedal, to prevent flash KR).

Having the larger pulley won't make it dump more fuel in. The PCM is metering fuel very closely by monitoring sensors (MAF, MAP, IAT specifically) and knowing what air mass is entering the engine. The PCM constantly calculates these "fuel trims" to adjust for any changes in incoming air density.

A bit off topic: zuul, how do you tune with the pt? Do you have a wideband or do you go off other sensors that it logs?