light wheels save gas? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

initial s14 · 08-13-2005, 12:51 AM

do they really help minimize your gas consumption or does it make you run faster? or it just doesnt make any difference especially if you go to a bigger diameter.. i mean by goin 17 or 18..you are still slow?

wootwoot · 08-13-2005, 12:54 AM

The less the assembly weighs the better gas mileage you will get. You will also acclerate and brake faster. The size doesnt matter as long as you stay as the same overall diameter.

**mrmephistopheles** · 08-13-2005, 03:31 AM

Quote:

Originally Posted by wootwoot

The size doesnt matter as long as you stay as the same overall diameter.

Not exactly. Rotational inertia changes when wheel diameter changes.

***S14DB*** · 08-13-2005, 07:24 AM

At the same weight the 18" rim will put more drag than the 17 cause the weight is farther out on the rim. The farther out the weight the harder it is to rotate. This is also true with big brake kits that stuff a bigger rotor into the stock caliper. Honda's have shown to lose 10hp stock with the AEM big brake kit that's 2lbs lighter than stock but the weight is 1" farther out.

So, Wheel weight and diameter do have a effect on performance.

raen419 · 08-13-2005, 08:25 AM

man, i've been preaching this since like.....2001....
and people STILL don't listen....

pignosecoupe · 08-13-2005, 09:52 AM

It is a fairly simple equasion:

(((A*B)/3.14)*C)+(A/(B*C)) (D-(E/F))
--------------------------------- - --------------- = X (difference in HP)
((3.14/B)*A)-(C*(B/(C+A) 3.14+(F+D)

See, Simple((ish) kinda)

mistaanime · 08-13-2005, 10:10 AM

eh....doesn't matter..in big or small wheels..you probably will save a little bit of gas..but you probably can't even tell the difference.

Pank · 08-13-2005, 11:19 AM

Quote:

Originally Posted by S14DB

Honda's have shown to lose 10hp stock with the AEM big brake kit that's 2lbs lighter than stock but the weight is 1" farther out.

holy shit, that is a LOT more than I thought.

WanganRunner · 08-13-2005, 04:07 PM

Don't buy lighter wheels, just diet.

**Phlip** · 08-13-2005, 04:11 PM

Quote:

Originally Posted by pignosecoupe

It is a fairly simple equasion:

(((A*B)/3.14)*C)+(A/(B*C)) (D-(E/F))
--------------------------------- - --------------- = X (difference in HP)
((3.14/B)*A)-(C*(B/(C+A) 3.14+(F+D)

See, Simple((ish) kinda)

Simple my ass, say that in english

Quote:

Originally Posted by WanganRunner

Don't buy lighter wheels, just diet.

NEVER, I enjoy eating what I wanna eat and drinking what I wanna drink...
*opens a beer*

Flybert · 08-13-2005, 04:19 PM

Quote:

Originally Posted by S14DB

Honda's have shown to lose 10hp stock with the AEM big brake kit that's 2lbs lighter than stock but the weight is 1" farther out.

Weight has nothing to do with horsepower. Less weight can make your car go faster but it won't give your engine more horsepower.

Light, smaller diameter wheels will definitely help with around town gas mileage where you are constantly accelerating and decelerating. As for highway driving, that's a different story. The rotational inertia of heavier, larger diameter wheels could possibly help gas mileage on the highway since you don't have to accelerate and decelerate as much.

Drunk Bastard · 08-13-2005, 04:38 PM

Quote:

Originally Posted by PHLIP

Simple my ass, say that in english

NEVER, I enjoy eating what I wanna eat and drinking what I wanna drink...
*opens a beer*

werd, i drank two pitchers already today

raen419 · 08-13-2005, 04:49 PM

um....flybert, i think he was referring to wheel hp, not crank.
and "freeing up" horsepower or drivetrain loss should be the terms used....not GAINING hp.

[email protected] · 08-13-2005, 04:52 PM

u dont have to diet urself... just put ur car on a diet. take out back seats, passenger seats, strip the interior etc.

a lot of ppl i meet that are really into drifting all say u need to put ur car on a diet to get rid of extra weight. but losing a couple pounds urself couldnt hurt

raen419 · 08-13-2005, 05:51 PM

unsprung weight is still a major problem for braking/acceleration.
getting rid of your interior or replacing w/ light weight parts isn't going to do as much good as lighter wheels w/ less rotating diameter.

***S14DB*** · 08-13-2005, 06:13 PM

Wheel HP. I could give a fuck what you make at the crank. It's all how you put it down...

raen419 · 08-13-2005, 10:53 PM

yup.

speaking of all this, and i know this is a thread jack, but it's kind of on-topic....

has anyone ever heard of a lightened underdrive pulley shortening an engine's life?
a friend of mine (who's a mechanic) said the lighter pulley can cause vibrations in the engine that aren't there w/ the heavier stock pulley.
it makes sense, but it doesn't....any ideas?

HyperTek · 08-13-2005, 11:01 PM

in theory, light weight girlfriend also saves gas, so choose your lady wisely.

Be more worried about wind resistance.. cars without a/c and windows down causes more wind resistance then a car running a/c... I like A/C, its hot in Socal, drive with your windows up and a/c on, saves more gas then people who strip it and run windows all the way down *like a parachute*

Body kits aint helpen either, unless they cut down wind drag.

KoukiMonster · 08-13-2005, 11:44 PM

and running your a/c saves gas?

okay..

***S14DB*** · 08-14-2005, 12:35 AM

On most modern 134a systems it does. Hypertek is right.

08-13-2005, 12:51 AM	#1
initial s14 Zilvia Member Join Date: May 2002 Location: socal Posts: 227 Trader Rating: (0) Feedback Score: 0 reviews	light wheels save gas? do they really help minimize your gas consumption or does it make you run faster? or it just doesnt make any difference especially if you go to a bigger diameter.. i mean by goin 17 or 18..you are still slow?

08-13-2005, 12:54 AM	#2
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 39 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	The less the assembly weighs the better gas mileage you will get. You will also acclerate and brake faster. The size doesnt matter as long as you stay as the same overall diameter. __________________ I'm from Florida so I'm probably a bit more strange than you

08-13-2005, 07:24 AM	#4
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	At the same weight the 18" rim will put more drag than the 17 cause the weight is farther out on the rim. The farther out the weight the harder it is to rotate. This is also true with big brake kits that stuff a bigger rotor into the stock caliper. Honda's have shown to lose 10hp stock with the AEM big brake kit that's 2lbs lighter than stock but the weight is 1" farther out. So, Wheel weight and diameter do have a effect on performance. __________________ Comments should be taken as Opinions not as Statements of Fact

08-13-2005, 09:52 AM	#6
pignosecoupe Leaky Injector Join Date: May 2005 Location: Santa Barbara, CA Posts: 140 Trader Rating: (0) Feedback Score: 0 reviews	It is a fairly simple equasion: (((AB)/3.14)C)+(A/(BC)) (D-(E/F)) --------------------------------- - --------------- = X (difference in HP) ((3.14/B)A)-(C(B/(C+A) 3.14+(F+D) See, Simple((ish) kinda) __________________ - Last edited by pignosecoupe; 08-13-2005 at 10:13 AM..*

08-13-2005, 10:10 AM	#7
mistaanime Nissanaholic! Join Date: Mar 2003 Location: Nine -1- Six Posts: 1,934 Trader Rating: (1) Feedback Score: 1 reviews	eh....doesn't matter..in big or small wheels..you probably will save a little bit of gas..but you probably can't even tell the difference. __________________ -Cherry Red 91 Silfourty-

08-13-2005, 08:25 AM	#5
raen419 Zilvia Member Join Date: Jul 2003 Location: Jasper, AL Age: 42 Posts: 253 Trader Rating: (0) Feedback Score: 0 reviews	man, i've been preaching this since like.....2001.... and people STILL don't listen....

08-13-2005, 04:07 PM	#9
WanganRunner Nissanaholic! Join Date: Mar 2005 Location: DC Metro Area Posts: 1,655 Trader Rating: (1) Feedback Score: 1 reviews	Don't buy lighter wheels, just diet.

08-13-2005, 04:49 PM	#13
raen419 Zilvia Member Join Date: Jul 2003 Location: Jasper, AL Age: 42 Posts: 253 Trader Rating: (0) Feedback Score: 0 reviews	um....flybert, i think he was referring to wheel hp, not crank. and "freeing up" horsepower or drivetrain loss should be the terms used....not GAINING hp.

08-13-2005, 04:52 PM	#14
[email protected] Leaky Injector Join Date: Jan 2005 Location: so cal Age: 38 Posts: 95 Trader Rating: (0) Feedback Score: 0 reviews	u dont have to diet urself... just put ur car on a diet. take out back seats, passenger seats, strip the interior etc. a lot of ppl i meet that are really into drifting all say u need to put ur car on a diet to get rid of extra weight. but losing a couple pounds urself couldnt hurt

08-13-2005, 05:51 PM	#15
raen419 Zilvia Member Join Date: Jul 2003 Location: Jasper, AL Age: 42 Posts: 253 Trader Rating: (0) Feedback Score: 0 reviews	unsprung weight is still a major problem for braking/acceleration. getting rid of your interior or replacing w/ light weight parts isn't going to do as much good as lighter wheels w/ less rotating diameter.

08-13-2005, 06:13 PM	#16
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	Wheel HP. I could give a fuck what you make at the crank. It's all how you put it down... __________________ Comments should be taken as Opinions not as Statements of Fact

08-13-2005, 10:53 PM	#17
raen419 Zilvia Member Join Date: Jul 2003 Location: Jasper, AL Age: 42 Posts: 253 Trader Rating: (0) Feedback Score: 0 reviews	yup. speaking of all this, and i know this is a thread jack, but it's kind of on-topic.... has anyone ever heard of a lightened underdrive pulley shortening an engine's life? a friend of mine (who's a mechanic) said the lighter pulley can cause vibrations in the engine that aren't there w/ the heavier stock pulley. it makes sense, but it doesn't....any ideas?

08-13-2005, 11:01 PM	#18
HyperTek Post Whore! Join Date: Mar 2003 Location: Cali Posts: 13,224 Trader Rating: (3) Feedback Score: 3 reviews	in theory, light weight girlfriend also saves gas, so choose your lady wisely. Be more worried about wind resistance.. cars without a/c and windows down causes more wind resistance then a car running a/c... I like A/C, its hot in Socal, drive with your windows up and a/c on, saves more gas then people who strip it and run windows all the way down like a parachute Body kits aint helpen either, unless they cut down wind drag. __________________ Keep it Classy

08-13-2005, 11:44 PM	#19
KoukiMonster Zilvia Addict Join Date: Jan 2004 Location: ? Age: 39 Posts: 700 Trader Rating: (0) Feedback Score: 0 reviews	and running your a/c saves gas? okay..

08-14-2005, 12:35 AM	#20
*S14DB* AFC #1 Join Date: Oct 2003 Location: 昨晩あなたのお母さんの家 Posts: 20,181 Trader Rating: (3) Feedback Score: 3 reviews	On most modern 134a systems it does. Hypertek is right. __________________ Comments should be taken as Opinions not as Statements of Fact