Please read the article. It is back (the link was dead for a time). This is the link to the story in Sport Compact Car about how wheel size and weight impact performance. Print it out before they remove it...

Power, Weight, Grip

If the 18" wheels are the same weight at the 17" wheels, there is a significant loss in 1/4 mile times. (I do think someone could make a very light 18" wheel that had less rotation inertia than our stock 17s. I'm not sure how the heat conduction would be for extended braking.)




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2001 Satin Silver Cl-S w/ Navi.
Mud Guards.
Wheel locks
Toyo 235/45ZR17-97W*
T1S Proxies on Stock 17" CLS wheels
Gtech 1/8th tank 40F ~=6.1

 

Aw Scott, now your making me blush.

 

that has nothing to do w/ losing HP

 

haha

 

The the numbres in the article mentioned are so close that I doubt that variations make sense. Those numbers are all with "normal tolerances" of normal observations and measurements theory.

The study is pointles INMHO. That matters less wheight, more grip at resonable price.


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Bare Bone Stock Type-S. Plenty of accessories. PIAA 19169 to be installed soon.

 

If one is measuring horsepower on a dynojet which determines horsepower based on f = m * a, then the wheel article and wheel weight has everything to due with hp (as read by a dynojet). One could make the argument that static hp is one thing and dynamic hp is another. The dynojet is lousy for doing spot hp adjustments, but does prove out the story that sport compact car did. If you put lead wheels on your car, don't expect to go fast.

I posted a link to a site with an article on how dyno jet dynos work. The measure the HP of a car by accelerating (spinning up) a drum. Figure it out, if the wheels are heavy they are effectively adding mass to the dynojets drum.

Heck, I'd love to find a place that had a static based dyno and a dynojet dyno.



------------------
2001 Satin Silver Cl-S w/ NAVI

• Mud Guards
• Wheel locks
• Toyo 235/45ZR17-97W* T1S Proxies on Stock 17" CLS wheels
• Gtech 1/8th tank 40F ~=6.1
• Zaino magic

 

What exactly is "normal tolerances" of normal observations and measurements theory?

Did you contact the magazine and other contributes to this thread and find out exactly how the produced their results?

Perhaps you would do us all a favor and counter the argument and data with some concrete (empirical) data of your own derivation.

It is so easy to speculate about others hard work and tests by just saying, "Gee, I don't think so". I find it difficult to discount the experience of FDao and others who have actually done tests.




------------------
2001 Satin Silver Cl-S w/ NAVI

• Mud Guards
• Wheel locks
• Toyo 235/45ZR17-97W* T1S Proxies on Stock 17" CLS wheels
• Gtech 1/8th tank 40F ~=6.1
• Zaino magic