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Old 05-26-2015, 06:47 PM   #1
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Unsprung weight with heavier wheels

When I put my 19x9.5 on it seemed like I lost a good bit of power. They are 31 pounds a wheel and with the meatier tires I added 8 pounds a corner and I've been told that's a big deal when rotating mass comes into play. Been looking into adding lighter wheels but my question is should I be able to tell a difference with dropping 5 pounds a corner or is this in my head. Just doesn't seem like it pulls no where near as hard as before. Thanks

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Old 05-26-2015, 06:48 PM   #2
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Rule of thumb is 1 pound of rotating weight feels like 4-5 pounds of weight just sitting in the car. So imagine an extra 32 lbs added in rotating weight.


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Old 05-27-2015, 10:22 AM   #3
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My god lol. Looks like I'll be looking into some new wheels. Appreciate it

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Old 06-16-2015, 02:11 PM   #4
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Yea I just bought some light 20's and they don't come cheap The price you pay to play.
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Old 06-26-2015, 12:35 PM   #5
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It's called rotational resistance, and it takes HP and torque to get and keep them moving every time you move the car, and added weight for your shocks and springs to deal with every bump you hit. It's even harder for your brakes to stop added mass ......yes, every time you stop.
I learned my lesson on heavier wheels on a previous car (2008 Corvette). The custom wheels dropped my mpg by about 3 mpg, and I could no longer spin the tires from a dead stop. With the stock wheels I could easily do so.....unsprung weight like you've added makes a HUGE difference in vehicle dynamics.
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Old 06-26-2015, 12:38 PM   #6
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Some would even argue that a 5-6 pound lighter wheel is as good as adding 30-40 hp. Sometimes it's not all about the power you have but everything around it.


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Old 06-26-2015, 12:51 PM   #7
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Some would even argue that a 5-6 pound lighter wheel is as good as adding 30-40 hp. Sometimes it's not all about the power you have but everything around it.


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That is a great point. Folks spend all that money on intakes and exhausts and other things that add noise, but not much, if any performance.
Lighter wheels would make an immediate and noticeable difference compared to a lot of other modifications talked about here.
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Old 06-26-2015, 01:10 PM   #8
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Unsprung weight with heavier wheels

Remember power only affects your acceleration. But weight affects acceleration, braking, cornering, ect...

A lighter car with less power will always be more favorable to me than a heavier car with more power (given horsepower to weight ratio is equal)


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Old 06-26-2015, 01:12 PM   #9
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Good points here. The exact ratio for dropping unsprung weight to sprung weight varies I guess. Like stated before the 1:4 is about right. I guess tires make a bigger difference because they're further from the center of the wheel. General rule is for every 100lbs off a tenth is gained in the quarter. I've also seen a test on a camaro ss where 15 whp was gained from drop 6-7 pounds a corner but I don't remember the exact numbers. Handling, like mentioned earlier, suffers the most. Light weight wheels are out of my budget unfortunately

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Old 06-26-2015, 01:14 PM   #10
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They are out of my budget also. That's why I am buying one at a time. Bahahaha.


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Old 06-26-2015, 03:05 PM   #11
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They are out of my budget also. That's why I am buying one at a time. Bahahaha.


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Hahaha, hey you gotta do what you gotta do man.

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Old 06-26-2015, 09:55 PM   #12
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I went from my stock 18s 235.50s to 20s 285.35 in rear and 255.35 fronts. Honestly, I didn't notice a difference in power at all. Felt the same as before with the 18s.
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Old 06-26-2015, 10:05 PM   #13
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Unsprung weight with heavier wheels

I'm getting ready to buy some forged wheels. Hopefully I'll shed a little weight off. Website doesn't give wheel weight so we'll see. Then it's getting wrapped in some Toyos R888.
But yes heavier wheels don't help, unless it's for getting a wider tire on.

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Old 06-26-2015, 10:53 PM   #14
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I went from my stock 18s 235.50s to 20s 285.35 in rear and 255.35 fronts. Honestly, I didn't notice a difference in power at all. Felt the same as before with the 18s.

Do you know what the weight was of the 18's and the 20's to compare? Like mounted and ready to go? Might have been close to the same.


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Old 06-27-2015, 09:53 AM   #15
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Do you know what the weight was of the 18's and the 20's to compare? Like mounted and ready to go? Might have been close to the same.


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I did not weigh them to compare. I do know that the 20s were heavier than the 18s when swapping them out though.
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Old 07-06-2015, 10:20 AM   #16
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I just got my new setup. Went from the 19x8.5 Premium pkg at 57lbs ea to the new CDC Outlaws 20x9F, 20x10R with Nitto Invos 275x35 & 295x35. Front stayed at 57lbs and rears went to 63 lbs. Can't tell any change in driving and just took small trip got 25 mpg hwy, 22.5 overall with 500 miles on car.. Overall very pleased with only added 12 lbs..
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Old 07-06-2015, 10:23 AM   #17
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Nice. Seen pics you put up earlier. Car looking good man

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Old 07-07-2015, 04:54 PM   #18
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I did not weigh them to compare. I do know that the 20s were heavier than the 18s when swapping them out though.

Lol


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