I think the main issue is if you're already going to be buying wheels, the difference between a heavier wheel that's mostly looks vs a lightweight forged wheel is going to be bigger.

I don't know about the s2k because I just went with RPF1's and in the size I'm running it's practically the same weight as stock. However, when I switched from a fairly heavy set of 17's on my 2000 GSR to a set of 15" Volks, I could easily tell the difference.

 

I have Stoptech brakes. I think they save something like 7 lbs per corner.

 

exactly - brakes !!!!
save weight on those.

front brake disk weights almost 15lb.
each one!!!!

 

Is there any way just to swap out the rotors for some lightweight pieces without having to buy a whole "big brake" kit?

Most of the OEM size rotors I've seen are fairly cheap and don't' seem to have weight savings in mind.

 

I put some Tein RS coilovers and Enkei RPF-1s on my car and I felt a slight difference...mainly the car just felt sharper and reacted to the road better. I saved 9lbs off each rear wheel, and 4lbs off each front. 26lbs of unsprung weight is a lot to take off a car!

I went from stock shocks, to a full aluminum coilover. Stock AP2 V1's with 225/255 Star specs to 17x9+45 all around with 245/255 star specs.

 

It's also worth noting you can save 10lb unsprung weight (2/8 F/R) by going with Continental ExtremeContact DW tires vs OEM. The weight of the tires is on a larger diameter so it will make an even bigger difference relative to the wheels or brakes.

 

Are you including the weight of the new coilovers in your calculation, because it only looks like you're saving 5/1lb (F/R) with those Enkeis over stock.

 

Yes I am including that.

AP2 :17.6lbs (17x7) and 20.5lbs (17x8.5)

Enkei RPF1: 16lbs (17x9) and 16lbs (17x9)

Just in wheel weight that is 3.2 lbs front and 9 lbs rear for a total of 12.2 lbs.

Coilovers were 1lbs savings on each front, and 3 lbs each rear for a total of 8 lbs savings.

I forget what the tires plus wheels weighed. I can check tonight. I did complete before and after weights on everything, but as you can see I am already at 20lbs off.

I do remember that my AP2 rear with 255 weighed 46lbs, and my Enkei with the exact same tire weighed 42lbs. I forget what the stock front weighed, but the Enkei with the 245 weighed 42lbs as well. I tried a few times, and still got 42lbs for the Eneki with both a 245, and 255 tire. Granted the 255 is worn about 50%, so if I had a full treaded tire it would have probably been closer to 46lbs in the rear, same as stock.

 

i saw project MU 2 piece discs with aluminum hat.
over 400$ a piece though.

and didn't see info how much lighter they are......

 

I was wondering the same thing about the lighter wheels.... When I went from my Ap1's to my Ap2v2's, I noticed it being a little more sluggish...Those rears are kind of heavy...