So I finally got some rims for Maxine. 04 SL rims. They look absolutley amazing. This is my first set of rims larger than '16. I'll say this. These rims , along with the tokico/hr setup have made my car handle like a champ. The car feels super planted. They also make the car look 100x better. I was not ready for the decrease in accelaration These things are heavy as hell. It also looks like my gas mileage has plumeted too. I raised the pressure on all tires to 34psi. Is this too much? 32 seems to little for these (dont want to bend a rim.) All i can say is, she looks great, handles great, but is now slower then before. Gas mileage sux too......The things we do for love......

 

always go with the recommended PSi ( which is normally located under the arm rest in center console... )

 

Here you go, from a 4th gen with '04 rims - http://forums.maxima.org/showthread....ecommended+psi

Looks like 32PSI, cold of course.

 

Yes 34 is fine, you should increase the PSI when you put on bigger rims than stock

 

Yeah I know how you feel, I had some sporza estrada 20in on toyo 245/35RZ 20 low profile proxie4. I had no modification to the suspension or anything. The car turned heads on a regular basis but as you said, the car got slower and the rims were heavy. My gas mileage went to high hell with it and lets not mention the pot holes in the city.

I had to sell the rims after 6mths. I'm looking to get the g35 coupe 18in's rims and lower the ride 1.25mm

 

yup thats perfect

 

You don't want to go with the pressure recommended for the stock tires when you are running non-stock tires. You want to go with the pressure recommended for your particular tires...

 

yea, just check in the armrest of a 04


is the decrease in acceleration really that dramatic? i just got new rims as well, and they're not exactly light. i guess i'll see when i get them mounted and i install them. but like you said, it will look so much better! it's worth it. i can always but the 15/17s on when needed.

 

having larger rims will require a little more power to overcome friction, static or kinetic. I'm not sure how much of an impact each extra incha has ... but it's there.

 

Uh, having larger rims with higher moments of inertia and larger rolling diameter, effectively gearing your car up, will decrease acceleration noticeably.

I think you're talking about wider rims.

 

I'm looking for rims, now.

 

yeah, some people just don't get it... they go into business...
static and kinetic friction... ooooo... sounds like it must be right so let's post it!!

 

I usually run my tires a little more than recommended, I really wouldn't fret over 2psi. I agree that you should go with the manufacturers specs for the tires and not the A34 OEM specs.

 

what? no. friction has nothing to do with it. Morpheus is right. it is the moment of inertia. even if two wheels have the same mass, yet one has the mass distributed further from the point of rotation, it will take different amounts of work to rotate them at the same speed.

 

i have 2k3 17's and i keep mine at about 30 psi, but im gonna bump that to 32 i think. i absoloutley love my rims.

 

 

i keep mine at 32....just what is recomended.......lets see some pics of those rims

 

i agree, i want some pics. are you dropped on tokico hp and h-tech or what???

 

Also, don't forget that every pound you add to your rims is rotating weight. It's like a 10X effect. (or something like that). so in effect, an extra 10 pounds of weight for the rim/tire combo is in effect an extra 100lbs when the wheels are spinning.
Again, not sure about the exact number but that's the reason that people use as light a wheel as possible when shooting for the best 1/4 mile times.

 

It depend how far away from the hub the 10 lbs is. I highly doubt that 10lbs onthe wheels would be equivalent to 100lbs on the car but I'm too lazy to figure it out. I give the acceleration formulas if someone is willing to spend the time.
Acceleration(object)=Force/Mass in cars Force=torque/Leverage length
Centrepetal Acceleration=(ForceXleverage length)/(massXleverage length) (divide answer by 2PiRadius(radius where the avg of the mass is) if you want your acceleration in revolutions/sec^2), Lev. lenth is where the avg length away from the hub that the mass of the tire is

since the car and the outside of the tire have to move at the same speed(the top of the tires moves 2x as fast the bottom is 0, avg is same as car speed), the wheels centrepetal acceleration in rev/time^2 when multiplied by 2pi(wheel radius) must be equal to the car's acceleration (object acceleration)
but since the wheels are also on the car, their mass must also be included. this means that the most effect the wheels can have is 2X their mass(if the avg mass of the wheel was on the outer surface, impossible). Therefore wheels effect acceleration more than their mass if they were just on the car, however, the effect will not be more than 2X the mass of the wheel.

 

ummm the way i understand it heavier rims = more unsprung weight = decrease in manoeuvrability
i dont see how you are seeing an increase in handling. maybe you are "feeling" the road more than before but i dont think you can push your car as fast around corners as with the smaller rims.
From a looks point of view they are definately sexy on a dropped 4th gen.

 

Here you go guys........a good explanation about the subject of wheels and performance.

This info is directly extracted from the org's Shop Talk section.

A brief explanation:

Without going into the equations too much (I = mr2), the lighter your overall wheel and tire combination weight is, the smaller the moment of inertia will be for accelerating them, which will allow your car to accelerate faster. Also, the closer the center of mass of the wheel and tire combined is to the axis of rotation, the smaller the moment of inertia will be, which again will allow for faster acceleration. A good approximation for this is to just assume that the center of mass of your wheel and tire is equal to the radius of the wheel itself.

So how big of a difference does a low moment of rotational inertia make? Well, the actual equations and algebra needed to show this directly get a little complex for those that are not engineers or mathematicians, so we will not do that here. However, a good approximation has been discussed and widely agreed upon that states that every single pound you add to your wheel and tire combination is equivalent to adding eight pounds to the curb weight of your car. However, you don't just have one wheel and tire. You have four of them, and all four wheels require energy to accelerate.

The entire article can be found here, read the Wheel/Tire Weight vs Vehicle Performance section:
https://maxima.org/shoptalk/sub_read...ns/index.shtml

After reading this, you will understand more why big, heavy wheels and performance don't mix well together.

 

That is exactly why i will be putting 350Z track edition 18's on mine (when i have the money ). They are only 0.4 lbs heavier than stock 16s

 

That will be nice, because all light rims are expensive as hell.