Sorry...was thinking inside the stockish setup box.. my bad

I had heard the same thing, where'* Rogue? Does he have any insight?

I'll page him. Yes, Mr. Rogue, 8-ball driver, former gearhead.....has a BC pager. Watch this:

Off topic:

A BC pager? Interesting, how does that work?

I go outside and yell O-**** in the general direction of Westerville Ohio. If I'm off a little in direction, the page sometimes gets intercepted in MN, and Haro comes in here asking WTF? Then I have to re-page.

I PM'd Rogue. He is the best person to answer this one.

Ask a stupid question......

The car should be able to take advantage of the pulley immediately. It is after all just more boost. However in the case of the 3.0 you may run into two problems. The first is that you may be getting KR which is is pulling timing and negating whatever power your getting from more boost. The second is that at the 3.0 inch pulley size you are at the limit of stock injectors. You may not be getting the fueling you need to go with the extra boost. 42.5'* are recommended at the 3.0 pulley size.

Without a proper scan and listing of injector pulse widths, or KR or Timing thought this is all just conjecture.

Also, it is my personal opinion (and experience) that water injection is not worth the tuning hassle to get right and even it it does work by reducing cylinder temps and controlling kr, anything that displaces air and fuel is only hurting the cars ability to make power. I know there are some that swear by it but we have tried it on a few cars here and at the dyno it showed we lost horsepower even though we negated all the KR we were seeing.

If you want to get rid of KR then free up the motors ability to breathe not drown it in water.

Just my thoughts.

Does the PCM have to re-learn fuel / air mixtures etc after a pulley swap and if so how long does the learning curve take?

It will learn short term and long term fuel trims over a certain period (not exactly sure of the exact time) but in my experience after changing the pulley and putting in race gas I usually start to see benefits about the 2nd or third run. Letting the car idle for a bit after the change will help as well. When most people say the car will learn the AF it is after a bit of cruising and it tailors itself to your driving habits (shifting as well as fueling). But for raw WOT power which uses base tables in the PCM anyway and locks in the last known long term fuel trim it doesnt really matter to much.