anything yet?

I've had the Stillen lightweight underdrive version on my car since Saturday, so just about a full week now, details over in my journal thread on the install and the feel afterwards, but no dyno yet:

http://www.the370z.com/members-370z-...html#post59072

In the days since I talked about it there, my impressions haven't changed. Slight horsepower bump and a more responsive (as in, to throttle inputs) engine is what I'm observing on the road.

When you say 'more responsive', do you mean it has more torque? Or just that it revs a little quicker?

I wouldn't necessarily say "more torque", but it's more than just revving quicker unloaded. It's hard to describe. The engine simply has less inertia to overcome on changes is the bottom line. It reacts to throttle changes under load (especially changes between accel + decel while staying in gear) faster. You could think of it as if the computer were inserting some very tiny electronic lag between the gas pedal and the actual throttles (or vvel, whatever), and the pulley took that away.

Butt dyno says some hps gains at the top end too, but no real dyno to confirm that yet.

Very nice Im hoping that this with the grounding kits will eliminate the slight lag when shifting my 5at

In the overall the shifts are slightly faster (the uprev/downrev period). I still have occasional very lagged 1-2 upshifts, which I'm really starting to get annoyed at. Usually they're fine, but every once in a while, it takes *forever* before it even begins to acknowledge the click for 1->2, like a full second (or more?). It's hard to tell timescales when you're expecting something so fast. When this happens, it's not that the shift itself it's slow, it's like the computer is having some kind of lag before it acknowledges the shifter input. I've learned not to click again thinking I failed to click though: it will queue them up and then quickly jump 1->2->3 when it gets its head out of its ***.