nickk__is wrote:Yeah I'm running the stock 215 tyres on there atm. I'm most likely going to make a move to 235/40 as the 245 width is technically illegal in NSW to the best of my knowledge.
Technically speaking, 225 is the widest you can legally go. The current model WRX and STi ships with 245, however, so unless you got nicked by a Subaru-savvy HWP officer, as long as your guards appear to actually cover the wheels, then they're not going to be any the wiser.
nickk__is wrote:When getting a tune done, will I need to get a piggy back ECU unit? or can the standard ECU be modified at all? Ive been looking into Motec and Haltech piggy back units but not 100% sure if they are needed... Thoughts ?
Extreme mods should probably consider going with a piggy-back ECU such as Haltech (which leaves common functions such as aircon and the like to the factory ECU), but the way they work is that they intercept and modify signals from the factory ECU instead of taking 100% control which some tuning purists believe is not as good as a full replacement ECU, however piggyback and replacement ECU's do provide extra features that are not necessarily available in the factory ECU such as an RS-232 connection for high-resolution logging, live-tuning, and extra inputs for things like temperature probes that may br drilled into a turbo model's intercooler to properly measure intake temps to adjust fuel accordingly.
That all said, for the most part you should be able to get away with just modifying the factory ECU's maps if your mods aren't too hard core, but I'm not a tuner, so get your final opinions on that from those in the trade such as Michael South.
I was going to procrastinate, but I put it off...