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Old 02-28-2005, 07:37 PM   #1
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Question Some questions that puzzle me?

I was doing some web surfing yesterday and was bored so I was looking at the stock SVT wheel weight (which looks to be 21 lbs.) and was trying to see if their were lighter ones out their in the 17x7" range. A question that I can't seem to find is how do you figure out rotating mass (what is the steps to figuring it out?) I am trying to see how much of a difference a lighter weight wheel would make? (And if it is even worth swapping wheels out for or not?) The lightest wheels I have found so far are in the 16.9 lbs range. Another thing I am interested in is if it will make a difference for my drivetrain to switch to a synthetic oil and which one? I am getting close to being allowed to switch my crankcase to synthetic which will be Mobil 1 5w-30, and probably the Motorcraft filter to filter the gunk out. But what about the transmission, is it a waste or does it actually make a difference (and are their verfiable dyno sheets to prove it does help out?) I am trying to free up some unused power. Keep in mind I have a 2004 SVTF.


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Old 02-28-2005, 07:42 PM   #2
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I'm interested in seeing these questions answered also.. They've been floating around in the back of my head also.
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Old 02-28-2005, 08:00 PM   #3
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Re: Some questions that puzzle me?

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Originally posted by svtfocusmansvt
I was doing some web surfing yesterday and was bored so I was looking at the stock SVT wheel weight (which looks to be 21 lbs.) and was trying to see if their were lighter ones out their in the 17x7" range. A question that I can't seem to find is how do you figure out rotating mass (what is the steps to figuring it out?) I am trying to see how much of a difference a lighter weight wheel would make? (And if it is even worth swapping wheels out for or not?) The lightest wheels I have found so far are in the 16.9 lbs range. Another thing I am interested in is if it will make a difference for my drivetrain to switch to a synthetic oil and which one? I am getting close to being allowed to switch my crankcase to synthetic which will be Mobil 1 5w-30, and probably the Motorcraft filter to filter the gunk out. But what about the transmission, is it a waste or does it actually make a difference (and are their verfiable dyno sheets to prove it does help out?) I am trying to free up some unused power. Keep in mind I have a 2004 SVTF.
Stock wheels are I think 21.5 lbs. There are many lighter wheels out there. Our stock wheels are cast, which is heavier. Forged wheels will be lighter. I have Centerline Storms in 17.7 - they are 15.3 apiece. Lighter wheels will make your car perform better in almost every way - acceleration, ride, handling, braking and fuel mileage.

it's kind like getting a tune in that there is really no downside to it.

Transmission has synthetic from the factory - see your SVT supplemental manual.
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Old 02-28-2005, 08:20 PM   #4
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I heard rumor that the synthetic was only a synthetic blend? How do you convert rotating mass? Common sense says a lighter wheel is better, but I wan't to figure out how much of a difference is achieved by a lighter weight. (I like to see graphs before commiting if you know what I mean.)
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Old 02-28-2005, 08:32 PM   #5
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Yea i wanna get some forged BBS rims ultra light and ultra strong!
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Old 02-28-2005, 08:42 PM   #6
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does having a lighter rim make that much difference??
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Old 02-28-2005, 10:10 PM   #7
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lighter rims reduce the unsprung weight of the vehicle, making the tires hug the road better, improving handling in all conditions
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Old 02-28-2005, 10:31 PM   #8
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If you know the wheel weighs 17 lbs (or whatever), you already know the rotating mass: 17 lbs (or whatever). I think you are referring to the wheel's moment of inertia. If that is the case, yes a lighter wheel will have a lower moment of inertia, and YES, you will notice a difference. From my experience, you need to drop 4+ lbs/wheel to really reap any benefits.

You cannot easily calculate the moment of inertia of a wheel due to its geometry. The rule is, you want to limit weight on the outside of the wheel/tire. So big heavy tires, fancy rims, etc. will not help you out. The rule of thumb is: for every 1 lb you take off your wheel/tire (unsprung mass), you essentially lose 5 lbs of sprung mass...this is not always true, its just a rule of thumb. Remember though, if you save 5 lbs/wheel, you are not effectively dropping 100 lbs. You are dropping more like 60-75 lbs (2wd)...
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Old 02-28-2005, 10:35 PM   #9
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Where are some good places to shop for some light-weight good looking wheels?
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Old 03-01-2005, 07:00 AM   #10
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There are alot of places you can look, but I've had good luck with any Rota wheel. Also, RoJa is pretty good. Both brands are very strong, lightweight, and inexpensive.
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