The 17" 350Z Base wheels that I had on the car previous:
Front:
Wheel Size: 17 x 7.5
Wheel Offset: +30
Wheel Weight: 23.26 lbs
Tire Brand: Hankook Ventus RS2
Tire Specifications: 225/45/17
UTQG: 200 A A
Tire Weight: 26 lbs
Rear:
Wheel Size: 17 x 8
Wheel Offset: +38
Wheel Weight: 24.14 lbs
Tire Brand: Hankook Ventus RS2
Tire Specifications: 245/40/17
UTQG: 200 A A
Tire Weight: 26 lbs
The new wheels are Enkei Racing RPF1
Front:
Wheel Size: 17 x 8.5
Wheel Offset: +30
Wheel Weight: 16.0 lbs
Tire Brand: Kumho XS
Tire Specifications: 245/40/17
Load Range: 91W
UTQG: 180 AA A
Tire Weight: 24 lbs
Rear:
Wheel Size: 17 x 9.5
Wheel Offset: +38
Wheel Weight: 16.9 lbs
Tire Brand: Kumho XS
Tire Specifications: 255/40/17
Load Range: 94W
UTQG: 180 AA A
Tire Weight: 25 lbs
So, we dropped about 7.26 lbs per wheel on the front and 7.24 in the rear. That puts the wheel weight savings at exactly 29 lbs. Even though we went up in with a full 20mm a side in the front, the tire weight dropped 2 pounds in the front. In the rear, I increased the tire width by 10mm a side yet the Kumhos are 1 lbs lighter apiece. So, tire weight savings is 6 lbs overall. The lug-nuts used were the same weight down to the ounce, though I am looking at getting some 19mm lugs instead of the 21mm because they are a little too snug for my comfort when trying to take the wheels of and on. Sockets barely fit in the space given.
So, overall weight savings for the new wheel and tire setup was 35 lbs. The turn in is noticeably different. Much like going from the 17" 350Z wheels to the 16" Twin Turbo rears x4 that I used to use for my race tire setup.
I absolutely love the Kumho XS's. They are top notch and they love the heat. The hotter the stickier. I'm extremely excited for Autocross season this year. With 3 events already under my belt, I can absolutely tell that the car is in a better place already. Since I'm racing in the street tire class this season it should be very interesting. Even though ESP PAX is super tough.
I'm going to realign the car here soon and adjust the corner weighting so exciting enough I will have new official weight figures for everyone. I'm pretty sure we're getting really close to being at that magical 3000 lb mark if we are not already under it.
And in other news... I've lost now 22 lbs off the spare tire attached to the front of my body. I didn't quite keep up with the car here as I'd like to do, but we're getting there, I'll whip this flabby a** into shape soon enough!
Onto a few pictures!
It's cool to see how the tires flex to hell in high G cornering. It almost looks like I'm in the Hella Flush crowd.

Taking the wife for a spin.

Pulling some G's.

















































