Front or rear wheel drive? - Page 2 - Subaru WRX Forum
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post #16 of 33 Old 12-31-1969, 07:00 PM
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So what you are saying is that if I have a 20 lbs rim and a 12 lbs tire I should be alright at about 30 lbs for the combo? Now who can tell me that the suspension dampening will realyl truely be affected that much why the weigh of bigger wheel. Guys with S-10s and Camaros are putting bigger rims on their vehicles all the time and they dont noticed a difference but they do see a better handling advantage.

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post #17 of 33 Old 12-31-1969, 07:00 PM
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Don

I didn't say that you can't use heavy wheels on any car, but it is important to keep a balance between the sprung and unsprung weight, and to keep the weight of the wheel/tyre combination suitable for the spring/damper rates used.

If the Guys putting larger wheels on their V8s keep the overall weight of the bigger package similar to the original, then they'll not run into problems. Equally, they are doing this to a much heavier car, so the change in the ratio of sprung/unsprung weight will make less difference than on a smaller car. Finally, it is arguable that the original suspension set up may have been on the stiff side in the first place.

For the WRX at least, Subaru have worked hard to keep the OEM wheels/tyres as light as possible to allow them to use low spring/damper rates for greater comfort. If you want to add significant weight to your WRXs unsprung weight (heavier wheel/tyres/brakes etc) then you will need to use stiffer springs and dampers and accept a harder ride. If that is what you plan to do, then fine, but you will trade its good bumpy road performance and comfort for that.

I started my working life working on road race cars - here we kept unsprung weight to an absolute minimum to maximise performance. Later, on rally cars we needed greater rim strength and added to unsprung weight to gain reliability at the expense of the ride comfort for the driver/navigator. Now, for my road cars I have keep a compromise of cost / ride, and I choose to keep the unsprung weight low to allow a reasonable ride - my wife won't drive the car if it is too hard. As I like good brakes and have upgraded the brakes (adding to the unsprung weight), I have had to keep the wheels light to avoid needing to firm the suspension to much. Your choices may be different to mine!

Duncan
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post #18 of 33 Old 12-31-1969, 07:00 PM
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That helps me a ton! Do you have any pics of your REX? You said that you put wheel on it so what kind did you end up going with? Your absolutly right in every aspect though. I dont want to compromise the ride quality whatsoever. I drive about a hour and a half everyday in my car and dont want any back problems. (lol) I really apprectiate all your help and knowledge. Thanks!

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post #19 of 33 Old 12-31-1969, 07:00 PM Thread Starter
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nekard:
sound like you drive almost as much as I do....I live in Batesville, MS (about 60 miles south of Memphis) and I have to drive to Tunica everyday to work (I work in Grand Casino)...about a 120 mile round trip 5 days a week...
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post #20 of 33 Old 12-31-1969, 07:00 PM
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Does anyone know where I can get a set of OEM UK wheels for cheap? I have been looking around everywhere for a set but cant see to locate them. Can anyone help me?

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post #21 of 33 Old 12-31-1969, 07:00 PM Thread Starter
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Vividracing.com has the UK wheels....I think they are about $1100 for a set...
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post #22 of 33 Old 12-31-1969, 07:00 PM
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Quote:
Originally posted by "nekard"


So what you are saying is that if I have a 20 lbs rim and a 12 lbs tire I should be alright at about 30 lbs for the combo? Now who can tell me that the suspension dampening will realyl truely be affected that much why the weigh of bigger wheel. Guys with S-10s and Camaros are putting bigger rims on their vehicles all the time and they dont noticed a difference but they do see a better handling advantage.
The set ups you are talking about are significantly different then what we have. A Z28 owner will put the biggest wheels they can find on their car to prevent wheelspin when they're launching. Having bigass sticky tires has a side benefit of improving handling, but even so the lighter wheels would still enhance the handling of those monsters. The original C5 Corvettes had magnesium wheels for just that reason.

I've heard that each pound of unsprung weight you can remove from your car equals two lbs. removed elsewhere on your car, so wheels aren't a place you really want to go cheap and heavy.
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post #23 of 33 Old 12-31-1969, 07:00 PM
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Great point! But for 18's i will be looking at which wheels. The only really good ones that I have been able to find are the Volk or Rays and then we have the OEM UK wheels but they are only 17"s. What is a guy to do?! If you were in my exacy shoes, what would you do?

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post #24 of 33 Old 12-31-1969, 07:00 PM
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Hey Bugeyed! Where can I find a set of OEM uk wheels? Can ya help me out here? I have been looking everywhere! I want rims (chants) I want rims! I want rims!

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post #25 of 33 Old 12-31-1969, 07:00 PM
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I think this got posted, but I could not find it. I believe the stock 16's are 16lbs. is that right?
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post #26 of 33 Old 12-31-1969, 07:00 PM Thread Starter
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again, vivid racing has the OEM UK wheels....vividracing.com
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post #27 of 33 Old 12-31-1969, 07:00 PM
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Sorry about that. Guess i musta missed it. Thanks again.

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post #28 of 33 Old 12-31-1969, 07:00 PM
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Also remember that the heavier the wheels the less WHP you have. Not only is handling affected but acceleration is affected as well. This is the idea behind lightweight pulleys and lightened flywheels. Your wheels act just like 4 flywheels so the heavier they are the more rotational inertia the engine has to overcome.
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post #29 of 33 Old 12-31-1969, 07:00 PM
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Great point. I understand that weight is very important on any car but how much can the weight of all those things adversaily affect the HP of the car? Isnt something in that range of 100 lbs equals a tenth of a second off the quarter mile?

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post #30 of 33 Old 12-31-1969, 07:00 PM
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That is when the weight is not being spun by the engine of the car, but rotational weight is a different story. In that case every pound makes a much bigger difference since it is being rotated around a given radius. As the radius increases the weight moves outward, away from center, it increases the rotational inertia, and thus requires more power to rotate the wheel. However, I don't know what the exact formula for this is, but I know it's in one of my old physics or thermodynamics books. I'm just too lazy to look it up. :-?
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