Are your responses scientific or just your opinion?
Lets break this down -
You said, "The 08 does not have run flats and therefore according to your argument, there would be no need for a heavy rim designed to run on a flat tire. So this would justify putting a much lighter rim on the 08, right? ok., are the rims on the 08 any lighter? Get the weight of the 08 rim and not guess about it. "
My response -
Aside from the new razors, the stock wheel that comes on the 08 is the stock wheel that came on the 06 - the five star which is quite heavy.
"Now, if you track the car, what speeds are you reaching? Some tracks, like Limerock in CT, only have speeds obtainable of about 140 mph (expert drivers), not really high enough for the lift issue to be significant. Now a track like Poconos or Ohio is a different story, you can reach speeds of 165 mph or slightly higher where lift would begin to become a factor. Lift is definitely a factor when trying to reach top speeds. Again, the brake issue may or may not be a factor for you, I am simply saying the factory wheels are designed to generate a certain cubic feet of air per min across the brakes for cooling and longer life and better performance. Maybe your aftermarket rims equal or surpass the design parameters, but you simply do not know...it is a gamble. Whereas w/ OEM wheels, it is not a gamble."
My Response:
Been to Pocono and had the car up to 150. Aside from that, I have had the car up to 175 mph and the car was firmly planted. I have since installed motons which further improved the ride and handling.
"HRE's are probably 8-15 lbs lighter ..." Again, you are guessing. You say "probably" and then you give a range of weight which varies by almost 100%. "
My response:
I am not guessing. I picked up each when I swapped them. The range is for the front and rear. Those are conservative numbers. You my friend have no experience with the wheel and tire packages and are guessing.
"As a Mechanical Engineer myself, I can tell you that kind of uncertainty is completely unacceptable when making decisions about a vehicle that costs almost 100k and that can travel at close to 200 mph. The sprung and unsprung masses affecting the suspension can produce behavior in the vehicle that is not predictable and not controllable if you began tinkering w/ design parameters. Now, you may be a very very good driver w/ lightening fast reaction times, but at least twice per month this summer we were reading about fatal car crashes w/ Viper owners....these cars can get away from you very quick especially when you do something you are not supposed to do."
My response:
The wheel and tire package signficantly improved the suspension dynamics due to the weight savings. It was a dramatic difference. Why are others who track their car adding light weight rim and tire packages to their SRT? Why do other performance cars owners all do the same like Porsche, Ferrari etc? The answer unsprung weight.
"Lastly, there is something called life-cycles that affect every moving part in the vehicle. Vibrations and heat are the number one causes of vehicle wear. Again the car is tuned for a certain vibration and again changing rims and tires throws the cars harmonics off and you accelerate wear on the vehicle, reducing life.
BUT, if none of these things are important to you....change your rims and go for it, maybe you will simply be lucky, or maybe it really does not matter, but I doubt it."
My response:
I am sure the vibration from the road alone is a lot worse then any minute change in "vibration" you get from changing the wheels and tires, if any.