Anyone Know New 0-62 Time For 2009 Rx8 Sport Model?? - Page 2

jayk · 02-21-2008, 10:30 AM

Quote:

Originally Posted by Icemark

No, their study did 5 lbs per wheel (or 20 lbs altogether) was equal to a 5 HP loss at the drive wheels.

Conversely if you had 17 lbs wheels and put on some super light wheels that were only 12 lbs, it would be like gaining 5 HP at the drive wheels.

And one of the reasons that the FC convertible only came with the uberlicht 11 lbs BBS wheels, while the Turbo FC had the 21 lbs alloy wheels.

Remember this is not a case of body weight, but rather drivetrain loss, due to the weight.

OK, sorry, misread.

And how does a 5 HP loss translate into 0-62 time?

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jayk · 02-21-2008, 10:32 AM

Quote:

Originally Posted by pdxhak

my 19x8.5 wheels weigh 2lbs less than OE wheels. My 255/19/35 tires weigh 2lbs less then the RE40's that came with the 18" OE wheels. 4lbs savings per corner. In addition my 19" wheel/tire combo is nearly the same size as the stock wheel/tire combo.

Exactly, until somebody weighs the wheels, we actually have no idea if they are heavier.

superdon2 · 02-21-2008, 06:10 PM

aftermarket rims are outside the discussion.. 18x8.5 volk ce28n with 245/35/18 is still indisputably the lightest of them all

iwc3707 · 11-03-2009, 05:34 PM

The 19" rims on the r3 are forged. More than likely they are lighter than the 18" cast wheels.

MICHGoBlue · 11-04-2009, 11:27 AM

So back onto topic.

clutch dumping 0-62 = roughly 6.2 seconds.
normal clutch engagement 0-62 = 7.4 seconds

dynamho · 11-04-2009, 05:11 PM

Wow! Zombie thread.

Since the thread discusses wheel weights for acceleration, something not mentioned is that it's not just about gross wheel weight. Weight distribution over the radius of the wheel plays part in it too.

For example, given 2 sets of wheels with the same wheel weights, the set of wheels with more weight towards the center and less weight toward the perimeter will provide better acceleration but less momentum damping.

This same principle applies to flywheels for throttle response.

So don't be just looking at the gross weights.

CarAndDriver · 11-05-2009, 02:08 PM

I thought the 09+ were slower to 0-60/62, because the new ratio required a shift to 3rd before getting to 60/62?