drag coefficient
#16
02-06-2003, 03:15 PM
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Re: drag coefficient
so basically.. we can try to go at a top speed of around 150 in the G, and it'll say 150 on the speedometer.. but if someone from the outside were actually clocking you, you'll actually be going a little slower due to drag? what kind of difference are we talking here, if there's any at all?
'03 G35 Sedan: ivory/aero body/sport/sunroof
Warning: Objects in mirror are FASTER than they appear
'03 G35 Sedan: ivory/aero body/sport/sunroof
Warning: Objects in mirror are FASTER than they appear
#17
02-06-2003, 03:22 PM
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Re: drag coefficient
Hmmm...not really. Let's assume the speedo is accurate and that the stock top speed is 150. The drag force at 150 is a constant because it is a function of the drag coeff (fixed) and the velocity (also fixed at 150). If 150 is your top speed, the peak stock Hp is needed to overcome the drag force at that speed. If you add more hp, you can go faster than 150 because you have more power to overcome the added drag force associated with the increase in velocity.
#18
02-06-2003, 03:29 PM
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Re: drag coefficient
He's right. Think of drag as the force of air against your car. As your velocity increases, so does the resistance that the outside air is causing. A Drag limited top speed means that the force of drag is greater than the force avaiable from your engine to propel the car along at that speed.
Your speedo reading will be the actual speed you are driving at (minus the margin of error present in the speedo) because it measures speed based on the rate at which the drive wheel is spinning. In other words, it reports your actual speed.
Andrew
2003 coupe 6MT blue premium aero (on order)
Your speedo reading will be the actual speed you are driving at (minus the margin of error present in the speedo) because it measures speed based on the rate at which the drive wheel is spinning. In other words, it reports your actual speed.
Andrew
2003 coupe 6MT blue premium aero (on order)
#19
02-06-2003, 03:33 PM
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Re: drag coefficient
oh yeah.. duh.. your speed is measured by the rate at which your wheel is rotating.. so i guess, the faster you go, the more drag, so the more power you need to move forward at that speed.. so your car adjusts the power in order to keep the wheels turning at the speed the driver is trying to achieve thru the accelerator.. to a point at least..
'03 G35 Sedan: ivory/aero body/sport/sunroof
Warning: Objects in mirror are FASTER than they appear
'03 G35 Sedan: ivory/aero body/sport/sunroof
Warning: Objects in mirror are FASTER than they appear
#22
02-07-2003, 10:42 AM
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Re: drag coefficient
Downforce has everything to do with drag. In making a race car you are looking to maximize lift(negitive lift actually)-to-drag ratio. Which means the most downforce you can achieve with the least amount of drag accompany it. The c of d value means something, but not everything, especially since automaker makes the measurement in a stationary floor windtunnel, many factors were ignored. For a road car, low drag means less wind noise and maybe better fuel economy.
To me personally, the most important aero claim Infiniti has made was the zero-lift front and read(with spoiler, without it only front), because that's what brings you highspeed stability, although it's not yet to the level of downforce, but it is better than lift which trys to reduce the grip of the tire. The low c of d value is just a added bonus....
look at this page:
http://www.mulsannescorner.com/data.htm
you can see some common road car(as well as race car's )aero data, compare the 0-lift of the G to say an Audi TT, which has 386 lb of force trying to grab the car off the pavement, making your steering feels light and the whole car unstable....
To me personally, the most important aero claim Infiniti has made was the zero-lift front and read(with spoiler, without it only front), because that's what brings you highspeed stability, although it's not yet to the level of downforce, but it is better than lift which trys to reduce the grip of the tire. The low c of d value is just a added bonus....
look at this page:
http://www.mulsannescorner.com/data.htm
you can see some common road car(as well as race car's )aero data, compare the 0-lift of the G to say an Audi TT, which has 386 lb of force trying to grab the car off the pavement, making your steering feels light and the whole car unstable....
#23
02-07-2003, 12:47 PM
Re: drag coefficient
Well stated. I'd just like to note that you need the underbody diffusers (or "floor coverings," as some parts dept.'s call them) to go with the spoiler to get zero rear lift. They come with the Aero Package, and I think some people have ordered them after the fact.
2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter
2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter
#24
02-07-2003, 01:42 PM
Re: drag coefficient
There's 2 or 3 pieces under there to do with aero. on the car. including the diffusers (floor coverings) and a much smaller outboard piece that directs air too. Fairly priced so I ordered them. When they're fitted I'll post some pics.[img]/w3timages/icons/smile.gif[/img]
Gsedanman's Coupe
Gsedanman's Coupe
#25
02-07-2003, 01:52 PM
#26
02-07-2003, 02:03 PM
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#27
02-07-2003, 02:28 PM
Re: drag coefficient
Yes, I'm aware. I just wondered which contributes the most? I'm not a big fan of spoilers, but the idea of having almost zero lift by adding just the under body diffusers sounds tempting (even though I doubt that I'd normally go fast enough to actually feel the difference, esp with the kids in the car, LOL).
#29
02-07-2003, 03:04 PM
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#30
02-07-2003, 03:28 PM
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Re: drag coefficient
Here are some diffusers to drool over; from the R34GTR.
<font color=blue>Dan</font color=blue>
21343-R34GTRunderbody.jpg
<font color=blue>Dan</font color=blue>
21343-R34GTRunderbody.jpg