Ahh the pulley/tune question. I asked about this when I first joined and couldn't get anything either - search some of my posts and you'll see what I contributed. I think it's for two reasons:enzom said:
1) Typical buyer of this suv NOT interested in performance (as evidenced by 35 views and only my reply!!) On the SVT forum you'd either have a 'do a searh' or the recommendation of several different tuners in your area.
2) Finicky electrics and engine management probably scares alot of people/tuners away.
That said, there's a decent amount of power on our S/C's that can be unlocked (big surprise, right?). Having come from an '03 Cobra, which has the EXACT same Eaton M112 blower, there's a lot left on the table with the factory tune, for obvious reasons such as LR wanting to protect themselves. I also know the feeling of having a plethora of tuners and devices from which to choose as the support for the Terminators is so great. On that, I went with a custom tune and 2.95" pulley and was putting down 440 RWHP, which is about 515 at the crank, and that's out of a 4.6 DOHC - not much bigger than the Jag 4.2. I have no doubt in my mind that you could easily and safely do 450 crank hp and tq on the RRS, the problem is that I can't even find a reasonably priced canned tune and pulley package. In fact, I've never even seen any dyno sheets of stock or tuned RRS's. I'd probably laugh at the stock tune cause it's probably pig rich the whole way.
So I guess I don't have any suggestions, only to say that there is considerable power to be had and I'd be dying to find out what kind of real numbers can achieved. I'd love to add another solid 50 rwhp. I would think that a GOOD tuner can adjust a/f and timing on any car, its just who wants to take the risk? That's the 64k question. Hopefully you do so you can report back on the results and all of us can start getting some serious HP gains rather than dropping a G on an exhaust system just for sound!!
BTW, the E55 is a bad ass car. I went with an '03 M5 years ago because I wanted the stick, the E55 was my other consideration but I eventually passed due to AOD only. Car just looks ready to take care of business even when standing still.
