OK, i borrowed my friends 18" to put them on the CLP. Well it weight exact 51lbs each rim and tire combo. Well, when i drove around, the car seems lost all the punches, i sure felt its alot heavier the way the car drives, and also, i lost those "whenever i want" torque. Before, I can give gas at ANY rpm, and the car will just pull, i mean, you can feel it. But now, its sure feels like an Accord power. So are 18s SUPPOSE to slow you down alot? Cuz I heard even tho the wieght are the same, the gear ratio changed, so it will be way off..... Is this true? All the guys with 18s, what yall think????

BTW, anyone know how heavy are those CLP 16" rims and tires? Or Accord V6 rims and tires, cuz they are about the same weight! Thanks alot!

 

I think that's normal... Because when I switch my wheels to a 17x8 on my previous car, 96 accord Ex, I felt like the car is more stablized. The car seems more "heavier" than before, but yet more stable and better cornering... I like it.

 

cuz somehow the torque are gone, well its there, but take alot long to the vtec range, and the rpm sure go up alot slower.

 

When u go with larger rims and tires u actually need to drop weight in order to have the same power. It's b/c there's more surface area/circumfrance(sp) that needs to get turned so to maintain speed/power etc the rims should be 3-4 lbs lighter.

 

It's all about the moment of inertia for the new tire/wheel combination. All things being equal, a bigger wheel will give you a larger moment of inertia, and will require more torque to accelerate.

To maintain acceleration when you get a bigger wheel, it helps to get 1. Lower profile tires, 2. Lighter wheels in general, 3. Wheels with low moments of inertia (most of the mass should be close to the center).

 

wow..."inertia" and "mass" someone took their physics, huh??

i dont know but i think my car rides the same..i dont notice any difference.

 

Both our TLs stock 16s and my aftermarket 19s weigh about 26 pounds I believe (I'd have to go look it up)... but 51 pounds is ridiculously heavy!

 

Unsprung weight is the number one enemy to speed.

 

well 51lbs is wheel and tire combo! If one rim is 51lbs, plus tires, i am looking about 70-80lbs per wheel and tire. Then I will be seeing Civic's taillights!

 

bah, it's introductory physics.....I learned that stuff in the first term of my program.

 

Unless the tire width stays the same, going to 18" usually means wider and stickier tires. As a result, the car must now overcome more friction between the four tires and the road surface. This all equate to sluggish feel whenever you step on the gas.

 

Its all about rolling resistance, when you add or reduce the weight of the wheels it is very substancial, because its rolling weight , its just like pulleys why do people by lighter pulleys, so the power transfer is quicker and more efficient, like wise with wheels, lighter the wheels and tires the quicker your car.

So go out and buy the smallest lightest wheels possible, it will make your car quicker. I just went out and bought a set of 14" ultralight weight wheels, and low profile tires for my acura tls, it sounds stupid but my 1/4 of a mile time dropped a full second, now i'm in the high 13's.

 

pianoman: Almost right. Unsprung weight is the enemy of traction, not speed. The more unsprung mass you have, the less responsive your suspension becomes to uneven roads.

tls260: rolling resistance has to do with how much power you need to supply to keep moving at a given speed. Although it's related to acceleration, it's only one factor.

Out of curiosity, I whipped up a spreadsheet computing the advantages of using lighter/biger/smaller wheels on the TL-S. The effect of wheel weight and moment of inertia is significant.

For example, cutting the weight of the standard TL-S wheels (17 inches) by half will give you the equivalent of about 4% horsepower gain (10hp at peak). Switching to 14-inch wheels weighing 75% of the original 17's will give you about 2% hp gain (5hp at peak).

These are very rough computations, of course!

 

You've got *way* too much free time.....

You should spend some of that time taking the dog to Motion Sickness Avoidance classes.....

 

Chances are, with 18" you probably increased your overall
wheel/tire diameter and in effect raised your gear ratio.

 

Lighter=Faster.....DUH....
Ed

 

Not always!

Lighter wheels with larger diameters may actually be worse than heavier, smaller wheels. Remember, it takes energy to spin the wheels, not just push it forward; and moment of inertia, not mass, is what you need to overcome when spinning them. You can get lighter wheels with larger moments of inertia.

 

good... cause i can't afford rims any time soon....
oh yea i haven't bought the car yet, gonna do that this month...
I think I'll be hapy with the stock type S rims for few years...:p



planning to tint 20% and lower it with Comptech springs....then flush mount spoiler on a Aegean Blue... I would like it to look subtle.

well love the forum pages for TL-S...see ya'll around