Question for those with superchargers

[halistan]

Got the SVX just before Christmas and I'm still using the 9psi pulley. Everything seems to be running well (albeit the engine seems unusually loud when i'm inside the car but that's another story) but I've got a few questions about tuning.

I'm using the ECUTune Stage III and it does run well but everyone keeps telling me I need to get a wide band sensor or i'm going to burn it up yada, yada, yada.

First of all, i'm not sure what I would burn up if the car is running too lean and I can't seem to find any posts that talk about that.

Can anyone give me some insight as to what that does and how to tell if the car is running lean? I know this can't really be 'tuned' until I get a Hydra or something but I wanted to know if there are some things I could do to make it run a little better while I save up money to do that down the road.

My other question comes from the fuel pressure regulator that was installed with this kit. Apparently the gauge on it is broken and when AWD Tuning checked it, it was set at 80psi. Now, when it was set that high it ran FANTASTIC. I mean, it really had some get up and go and I liked it.

When Collin was fixing the car though after my little fire mis-hap, he said that was way too high and would damage my fuel pump and set it back down to 40psi. That's fine and all and I'm glad he did but it does seem to have less power now.

That being said, does anyone know what the fuel pressure should be set at for these things? Is 80 going to screw something up? I have the 12psi pulley but haven't put it on yet because I want to make sure its in stable condition before I ask AWD Tuning to put it on.

Any thoughts? Please edu-ma-cate me