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youre better off getting an aftermarket lightened steel wheel. it will be stronger because it was machined that way and not just cut down. there are negative effects too that youll have to live with. loss of engine speed rapidly between shifts, loss of momentum off of the line, increased vibration, increased noise - especially when starting. oh yeah, expensive too.

 

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ok but about can be made an estimation of 0-100km/h and 400m time improvement, and how much weight i have to lose to achive that

i want to take my car to the edge betwen street drivbility and race/performance
i do not take my foot off the pedal when i change gears, i only raise it a bit to have proper rmp, so " loss of engine speed rapidly between shifts" this will not be a problem, it will only afect as i understood the engine brake (i do not how to say , u shif tto a lower geear to decrase the speed of the car, i use it mostly when i descent a mountin with a lot of curves)

the vibration i think it will apear only if it is not proper balanced

in what way it is expensive? takeing some metal from it it is much more chaper then buyn an aftermarket one

anyway can someone who has a lightenweight flyweel, how much weight did he losed and how his car performance (0-100km/h time and 400m time) was improved?

being properly balanced is not why the lightened flywheel is nosiy or has vibration, its simply because there is less metal there to absorb vibration and noise. the reason the engine loses rpm's is because the flywheel is spinning mass. lessen that mass and it takes away some of the engines ability to maintain torque without accelerating. thats the reason the engine revs faster too. less mass to spin. you will lose some engine braking with a lightened flywheel. the weight savings depends on the wheel you buy. my stock altima flywheel was 19 lbs if i remember correctly and my jun was only 11. so theres a significant difference in weight.