matt13b

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

636

0-62 3.5 seconds....lol

TheKDog

I bet it's slower than its 0-60 time.

Spinning Sushi

iTrader: (21)

chancejat

iTrader: (2)

probably .1or.2 faster

mikefrombarrie

the 0-62mph will be slower, since the power is the same as before and they added extra weight to the car...

My guess? 0-62mph in 6.8seconds.

jayk

What extra weight did they add to the car?

With the new gear ratio it should be slightly quicker, unless it means you have to shift right before sixty.

Icemark

Yep, should be quicker, with the new rear end and tranny gearing

superdon2

can't be exact. either a fraction of a second quicker or just the same.

should be quicker because of 4.77 gears. but structural reinforcements and new oil cooling system just might add weight resulting in identical times.

of course these are just speculations for now. i'm sure in paper it would be quicker because why would anyone buy a slower car?

mikefrombarrie

The gain from the 4.77 gears will be unnoticed since they added weight to the wheels, they are now 225/40/19. My guess it will be more then 5lbs per wheel then before.

SayNoToPistons

iTrader: (8)

Don't think that can slow the car down by a second...

mikefrombarrie

well I am going by the more realistic 6.5seconds that Car and Driver tested the car when it was against the 350z, Audi tt and Mustang

chancejat

iTrader: (2)

its very easy to get 6.1-6.2 consistently with just a 4k feather and some wheel hop....my best was a 5.7....but that was a perfect launch at 6k with very little hop....i dont see why they cant have real times at 5.9 secs with an upgraded suspension to get rid of hop and lower gearing with the 18 inch rims not the 19's.....i guess we will just wait for a road test.....

docmx

[QUOTE=chancejat;2301836]its very easy to get 6.1-6.2 consistently with just a 4k feather and some wheel hop....my best was a 5.7....but that was a perfect launch at 6k with very little hop....i dont see why they cant have real times at 5.9 secs with an upgraded suspension to get rid of hop and lower gearing with the 18 inch rims not the 19's.....i guess we will just wait for a road test.....[/QU
thats it true....

sosonic

I just don't get the need for 19 inch tires from Mazda. The demand was/is for faster times and not bigger tires. Something is seriously wrong with some people on the RX-8 project at Mazda.

Spinning Sushi

iTrader: (21)

Talking about gear ratios.... the reverse gear is in the in the top left instead of the bottom right.

delhi

19" rims may hurt acceleration times despite new gear ration to compensate for. 19" is not needed. regular cars are showing up with the rim sizes the same as found in Ferraris.

chancejat

iTrader: (2)

the r3 has the 19's not the other models as far as i know....except for the ms

jayk

Bigger does not have to equal heavier... They could be made out of a lighter material. Having said that, in this case, I agree they will be slightly heavier since the "R3" package seems to be mostly about adding foglights and bigger wheels than performance. I don't see 5lbs per wheel though.

Also, fwiw, given the shorter sidewall, the overall diameter of the 19" wheels should be the same as the 18" wheel. So the only effect it will have on acceleration is any weight that it adds. 10-20lbs is pretty minimal as far as 0-60 times.

Icemark

actually Honda did a test a few years back and every 5 lbs of weight on a wheel sucked off 5 HP on the dyno.

So if the 19" wheels were 5 lbs heavier or 10 lbs heavier than the 18" wheels, the 09 with the 19" wheels would seem like it was down 5 or 10 HP over a RX-8 with 18" wheels.

jayk

Interesting. Technically it would actually feel like it sucked off 20HP on the dyno though (5lbs per wheel).

I usually go by the rule of thumb that says a 10 pound reduction in weight is worth a .01 second reduction in quarter-mile time. Rule #2, every pound of wheel weight is worth 2.5 lbs of car weight. So if you gain 5 lbs from every wheel thats 20 lbs by 2.5 equals gaining 50 lbs on the chassis.

Which means we are looking at a .05s gain in quarter-mile time. Which means 0-62 is more like a .025 gain. So if the car previously did 0-62 in 6s, it would now do it in 6.025 seconds with the heavier wheels.

I'm pretty sure the new gear ratio will make a bigger difference or they wouldn't have bothered.

I pulled the rules of thumb off the web so they could be wrong

arghx7

I hate this trend for bigger and bigger wheels. I mean really there is no reason go bigger than 17 or 18 inches. It's just a rediculous addition of weight. and the new ZR-1 has homie G dubs on it. rediculous.

matt13b

I agree with you all.Thanks for your help. I live in sydney australia and have tried to keep my car as light as possible(keeping the 18 size wheel even in after market set) and I was thinking of putting the new 4.77 gear ratio set into my car. The other thing they are adding as well as overall weight to the car with the wheels is unsprung weight which has a very real relation to handling of cars..

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.

pdxhak

iTrader: (2)

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.