http://www.audizine.com/for...-on-wheel-horsepower

In all 3 cases, the wheel+tire combination overall diameter was kept the same. However, the weight of the wheels caused a measured effect on RWHP.

What's even more interesting is that the weight of the wheels almost linearly affected the torque. I guess this would also relate to lighter flywheels...

...also makes me want to go back to stock brakes/rotors...

[This message has been edited by lou_dias (edited 01-20-2016).]

The Ford Mustang GT350 R is the first production car to come with carbon fiber wheels. I read the raw numbers, but cannot quote them. Motor Trend mentions that we should invest in carbon fiber.

quote Originally posted by Tony Kania: The Ford Mustang GT350 R is the first production car to come with carbon fiber wheels. I read the raw numbers, but cannot quote them. Motor Trend mentions that we should invest in carbon fiber.

Yeah but custom carbon fiber wheels cost about $2000 per wheel last time I looked...

quote Originally posted by lou_dias: Yeah but custom carbon fiber wheels cost about $2000 per wheel last time I looked...

I did not bring up cost? Just notification. Knowledge. Much like your original post. Sorry if I commented.

quote Originally posted by lou_dias: http://www.audizine.com/for...-on-wheel-horsepower In all 3 cases, the wheel+tire combination overall diameter was kept the same. However, the weight of the wheels caused a measured effect on RWHP. What's even more interesting is that the weight of the wheels almost linearly affected the torque. I guess this would also relate to lighter flywheels... ...also makes me want to go back to stock brakes/rotors...

I don't think it's a revelation... but maybe I am missing something? That article is from like four years ago - I thought it was widely known that rotating mass disappears power... ?

Imagine the results on a 140 hp Fiero that originally had 14" wheels and is now rocking 20" chrome wheels!

When I had my Challenger, many of us (Challenger owners) participated in a "dyno day" at a shop near here.
The cars with the 18" (base R/T) wheels seemed to do incrementally better than the cars with 20" wheels.
Made more of a difference than we noticed between the cars with 3.73 and 3.94 rear axle ratios.

quote Originally posted by Raydar: When I had my Challenger, many of us (Challenger owners) participated in a "dyno day" at a shop near here. The cars with the 18" (base R/T) wheels seemed to do incrementally better than the cars with 20" wheels. Made more of a difference than we noticed between the cars with 3.73 and 3.94 rear axle ratios.

That's just it. Gears and tire diameters don't affect a dyno, but weight does.
I originally dyno'd my 3.4 at 187rwhp then I started moving to bigger wheels+tires for traction at the track and lost power. I'm pretty sure the weight difference was more than 10 lbs. I'm currently running 315/35-17x9.5's and dyno'd at about 164 rwhp. My original dyno was with 255/50-16x8's. Last year, I was running 275/40's on the 17's and dyno'd in the low 170's. My weight distribution also move outwards. It would be easier to spin the tires if the weight was centered towards the axis of spin. With the weight moving away from center, the load on the motor is increased.

[This message has been edited by lou_dias (edited 01-20-2016).]