Well to be honest IMO i think theres nothing wrong with your car, the 3 speed auto's have a super tall diff ratio of 2.77 and first gear is abit of a yawn of the lights. Don't get me wrong it's not that your car has no power but it's the ratio's and trans.
My mate had an XF Fairmont with a 3 speed as well, and on the dry on a straight line if you boot it, it won't spin. Lights'em up around corners though :nuts:
Trust me if you wan't to do that party trick apart from doin up the engine put a manual with a higher diff ratio like a 3.08. Hehehe just ask DK with his 5 speed XF. :nuts: :nuts:
The XE should have 107kw in a manual it would light'em up no probs.
I've had a carby 87XF 4.1 5speed with a 3.45ute diff which could light up 245's with ease in a strait line(incluing 2nd gear)and would only do 150-160K's flat chat,it was the best tow car I have ever driven till the T5....died in the ass!