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Discussion Starter · #1 ·
I followed RKelly's instructions and got an account at image shack so here we go.



and take that...



and that...



5mm spacers at rear only



Great caliper clearance...



Superlight (18.5lbs)...Also the color is somewhere between silver ad TI grey.



Fills up the fenderwells (stock springs, for now
)

Enjoy,

Chad
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

Dio you really feel any difference with the weight? I've read some estimates which say the car should feel something like 500 pounds lighter with those wheels. I'm a little skeptical of that, but what do you think?
 

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Discussion Starter · #4 ·
Re: OZ Ultralegerra's on the R (Dashdog)

The car pulls much harder now, especially above 3500rpm. The car wants to break the wheels loose, and I can feel the awd having to transfer more torque to the rear because of the loss of front end traction. I only have a BMC, no ecu upgrade, but it feels like 25-30 hp increase. I understand that this is not actual hp but the reduction in reciproacting mass has the effect of making the car faster just as real as adding hp. The low end is the same, but when boost kicks in, the thing goes, and with noticably more intensity than with 17" pegs. http://********************/smile/emthup.gif
 

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Re: OZ Ultralegerra's on the R (Dashdog)

I've been researching the effects of wheel weights for a while now and came across this site with an excel spreadsheet: http://the-welters.com/racing/rotational.html

I've read many posts that vary the range from 3lbs to 10lbs for each lb on the wheel, but the above spreadsheet has a nice scientific approach which seems believable and realistic. I've seen others but this one was my favorite.
 

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Re: OZ Ultralegerra's on the R (volvoNB)

Quote, originally posted by volvoNB »
I've been researching the effects of wheel weights for a while now and came across this site with an excel spreadsheet: http://the-welters.com/racing/rotational.html

I've read many posts that vary the range from 3lbs to 10lbs for each lb on the wheel, but the above spreadsheet has a nice scientific approach which seems believable and realistic. I've seen others but this one was my favorite.

Waiting for Kelly......
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

That looks hot! http://********************/smile/emthup.gif Makes me want to get a set.
 

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Discussion Starter · #8 ·
Re: OZ Ultralegerra's on the R (Volvo Grrrr)

Quote, originally posted by Volvo Grrrr »
That looks hot! http://********************/smile/emthup.gif Makes me want to get a set.
The best part is that it actually improved performance of the car. Much more than just a cosmetic mod. http://********************/smile/emthup.gif
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

Quote, originally posted by Turbo Chad »
The best part is that it actually improved performance of the car. Much more than just a cosmetic mod. http://********************/smile/emthup.gif

Yep, I sure know about that one. I had a set of 17x8" OZ Superlegerras on my previous car. I got better gas milege with them on compared with the stock 15's. http://********************/smile/emthup.gif
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

http://********************/smile/emthup.gif http://********************/smile/emthup.gif http://********************/smile/emthup.gif

Looks good TC. I had 18x8 OZ superleggeras on my previous car and they are quality wheels. If these were out when I was looking for wheels I definitely would've gotten them.

 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

Good choice.
I just bought a set of these (17's) for a "new 03" Lexus, I bought for my wife
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

That looks fantastic! Bet it would look better on a red wagon....
 

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Re: OZ Ultralegerra's on the R (needsdecaf)

Quote, originally posted by needsdecaf »
Waiting for Kelly......

I've seen very realistic spreadsheets claiming 6 - 8 lb acceleration/braking equivalent. I use 7 as a rule of thumb now.

Soo... since I'm shaving over 10 lbs per wheel by switching from 18" Ti Pegs with 245/40s to 18" OZs with 235/40s, I am shaving equivalent of 240-320 lbs. Since someone else said 100 lbs is equal to approximately 10 hp... Chads estimate of 30 hp is about right.

But more importantly, I will do before and after G-Tech runs, and settle this issue once and for all.
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

Quote, originally posted by Turbo Chad »



You live on the corner of 14th street... DAMN. I thought is was 16th street. Hopefully Chinese embassy wasn't on 16th.
 

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Re: OZ Ultralegerra's on the R (Turbo Chad)

Quote, originally posted by Turbo Chad »


Superlight (18.5lbs)...Also the color is somewhere between silver ad TI grey.


What is the load rating on these?
Pretty light for a cast wheel.
 

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Re: OZ Ultralegerra's on the R (SleepR)

Quote, originally posted by SleepR »
Pretty light for a cast wheel.

Sort of why we bought them.
Much lighter and cheaper than Superleggera III.
 

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Re: OZ Ultralegerra's on the R ("R" Kelly)

The Super Leggera was rated 17.6...
 

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Re: OZ Ultralegerra's on the R ("R" Kelly)

Quote, originally posted by "R" Kelly »


Much lighter and cheaper than Superleggera III.

I mean to imply, "can they meet the load rating required for the V70R if they are this light and are not a 3 piece whele with a forged center?"
Strength in a light wheel like Fikse Profil 13

or
the HRE 540

usually means +$700ea.
 

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Re: OZ Ultralegerra's on the R (SleepR)

Quote, originally posted by SleepR »


What is the load rating on these?
Pretty light for a cast wheel.

690 kg, if I recall correctly. My superleggeras in the same size (and weight) were also rated at 690kg.
 

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Discussion Starter · #20 ·
Re: OZ Ultralegerra's on the R (SleepR)

I wasn't able to find the specific load rating info on the OZ website but there was a statement saying that they have achieved 40% weight savings while maintaining OEM load ratings for each fitment. I would believe it because of the way the wheel is designed. It is very efficent structurally, has ridges and webs just like any other lightweight structure. It was clearly designed to be light, not for looks. It just happens to also look great.

Three piece wheels usually have a forged center section but the rest of the rim is either spun (not very strong) or cast. They also do not have an integrated structure like the ultraleggera. Look at how the spokes on the OZ come out to support the lip of the rim. It has a set of ridges on the interior of the rim also that create strength without adding material. The casting is also of a very high quality (no casting marks, or imperfections), it looks more like a forged wheel in its finish. I have heard that there are new casting methods that align the granular structure of the metal in much the same way forging does, I'm guessing that OZ probably uses the most advanced casting technology. As a final note, all F1 wheels and CART wheels made by OZ are one piece wheels.
 
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