I beat a 3rd gen RS (I think, it didnt sound much like a V6) a couple nights ago...WITH some ricey 12yr old girl driving (you know, when they sit super low and they look like little kids). What an accomplishment, if anyone cares at all =)
240SX arent slow, they are that mid area between slow and decent, what I like to call...quick. Saying the 240SX is slow sounds like a bitter remark of someone whos been burned =) You just gotta know your limits in 155hp 2800lbs car, ie. what you can possibly beat and what you have no chance against.
Kill List: older V6 camry, many V6 stangs, many eclipse RS and GS (1st and 2nd gen), couple of civic hatches, a Ford Bonco (what can I say? the guy was revving at me), I know Im forgetting some...
BTW- Did some quick research, 0-60 6.9sec, 1/4 mile is around mid 15s. Here is a slip for a 2003 GTS V6:
http://www.dragtimes.com/detail.php?ID=2313 (highish 60foot time, but still....probably the avg driver, take that into consideration.) So its possible to beat a 3rd gen V6 with a fairly stock 240SX.