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Old 03-24-2004, 02:07 AM   #1
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Thumbs up Just posted review and pics on iON/KVR performance 2-pieces brake rotor for the STi

Check it out guys, great product, I can't say enough good things about them.

http://forums.nasioc.com/forums/show...hreadid=527157

Buy their 2-pieces rear STi brake rotor here, or at least show some interest:

http://forums.nasioc.com/forums/show...hreadid=510965

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Old 03-24-2004, 04:09 PM   #2
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why are the rears so much more expensive?
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Old 03-24-2004, 04:25 PM   #3
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Quote:
Originally posted by G-force
why are the rears so much more expensive?
because the rear hat on the rear rotor is also the drum for the parking brakes, they can't just use an aluminum hat like the front as it would wear out too fast. They can use a steel insert on the inside, but steel is heavy, so the weight saving won't be that great. They figure out they can use a titanium insert with a friction coating. That is why it cost so much more.

If you look into it, all other company that offer a 2-pieces front rotor for the same OEM Brembo brakes set up (STi, EVO, G35, 350Z, R32/R33/R34 GTR), don't offer a 2-pieces rotor for the rear.

So Kudo for iON for figuring it out and let's make it happen guys

9 lbs per rotor is huge

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Old 03-24-2004, 06:36 PM   #4
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ok - i'm no metal expert - but why would we need a titanium insert for a parking brake lining? unless you're planning on drifting?
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Old 03-24-2004, 08:35 PM   #5
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G-force - using aluminum only for the parking brake will cause the hat to wear out. Which means that the part will not last, making it a very expensive item to replace.

The specially treated titanium is more durible and should last the lifetime of use on the car. (Also it has a higher frictional coefficient vs. aluminum).

There's quite a few reasons why we chose this route, it would be the most bang/buck method of making them. We could press in the cast iron hub into an aluminum, hat, however this would offer very little benefits other then just looks.
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Old 03-24-2004, 11:26 PM   #6
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How do the thermal properties of titanium compare to those of aluminum? Will the titanium effectively isolate the heat in the cast iron rotors and keep it away from the hub and wheel bearing assembly?
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Old 03-25-2004, 05:16 AM   #7
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How does your kit compare to the one from:

http://forums.nasioc.com/forums/show...hreadid=524667

Seems to be a HUGE price difference.
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Old 03-25-2004, 10:52 AM   #8
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Quote:
Originally posted by QuickSilverSTi
How does your kit compare to the one from:

http://forums.nasioc.com/forums/show...hreadid=524667

Seems to be a HUGE price difference.
Two piece rotors vs. one piece. Apples to oranges.
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Old 03-25-2004, 12:52 PM   #9
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Ahh, that would explain it. I suck at the reading.
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Old 03-25-2004, 01:47 PM   #10
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Quote:
Originally posted by QuickSilverSTi
How does your kit compare to the one from:

http://forums.nasioc.com/forums/show...hreadid=524667

Seems to be a HUGE price difference.
Two pieces vs. one piece

16 lbs vs 22 lbs, HUGE 30% weight difference.

911 Turbo to STi.

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Last edited by JDM addict; 03-25-2004 at 02:45 PM.
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Old 03-25-2004, 01:57 PM   #11
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Have you thought about the weight savings not REALLY being worth the $$$$?

All the weight saving is on the hat, which is towards the center of rotation. So all this means is that your acceleration will be minutely better, and handling will be minutely better because of the less unsprung weight. Either way....the price for the 2 piece rears is just.....ridiculous.
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Old 03-25-2004, 04:04 PM   #12
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Quote:
Originally posted by Soontobe
Have you thought about the weight savings not REALLY being worth the $$$$?
whether anything worth the $ it cost is all personal, all relative, depends on how you look at it.

Quote:
Originally posted by Soontobe
All the weight saving is on the hat, which is towards the center of rotation
Good point, but not ALL, just a big portion of it, see Russ's post here:

Quote:
Originally posted by rlavalle
One reason these rotors are lighter than OEM ones is that the metal in the disk's wall is thinner than stock. IE, while they are the same thickness, the KVR rotor has more venting space inside.

More Specs:
KVR Venting thickness: 15.5mm
STi OEM Venting thickness: 12mm

Note the difference in space in the center.


Russ
Quote:
Originally posted by Soontobe
So all this means is that your acceleration will be minutely better
Some what true, but not as small of a difference as you are thinking.

Quote:
Originally posted by Soontobe
and handling will be minutely better because of the less unsprung weight.
not a HUGE differences, but can't be ignore.

Quote:
Originally posted by Soontobe
Either way....the price for the 2 piece rears is just.....ridiculous.
It is a lot of money, but for what you are getting, it is very reasonable.

What you have to know is, even though the weight saving and all the performance benefit doen't seem like a lot just from the rotors. But everything adds up. Weight saving from the iON 2-pieces rotor, aftermarket coilover and some light weight wheel can be as much as 17 lbs per corner of the car, that is a lot!! Another example is other weight saving item I did to my car, like titanium exhaust, tiny battery, remove spare tire/jack/tools....etc. My friends always make fun of me because none of them yield a lot of weight saving, but so far I took 160 lbs off my car, that is a whole person's weight

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Old 03-26-2004, 12:28 AM   #13
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I'm still not sure how the aluminum hats would wear out on the parking brake. I don't know how you guys park your cars, but I bring mine to a stop, then engage the parking brake, hence there is no relative motion, no friction, no wear. I would think you could just apply the "friction treatment" (whatever that may be) to the inside of the aluminum hat (to provide additional grip while parked on a hill, for instance) and call it a day. What am I missing?

Of course, if you went that route, then JDM Addict wouldn't be able to get all excited about having titanium parking brake hubs on his car. Titanium RuLz!!

Pat Olsen
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Old 03-26-2004, 12:39 AM   #14
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Quote:
Originally posted by Patrick Olsen
Of course, if you went that route, then JDM Addict wouldn't be able to get all excited about having titanium parking brake hubs on his car. Titanium RuLz!!


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Old 03-26-2004, 03:33 AM   #15
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Quote:
Originally posted by Patrick Olsen
I'm still not sure how the aluminum hats would wear out on the parking brake. I don't know how you guys park your cars, but I bring mine to a stop, then engage the parking brake, hence there is no relative motion, no friction, no wear. I would think you could just apply the "friction treatment" (whatever that may be) to the inside of the aluminum hat (to provide additional grip while parked on a hill, for instance) and call it a day. What am I missing?
Pat Olsen
'97 Legacy 2.5GT sedan
my exact thought!! I'm sure they can save a few $$ by taking out the titanium...besides, there's no titanium in their front kit
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Old 03-26-2004, 04:52 AM   #16
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Patrick Olsen - aluminium does not have the right thermoproperties nor resistance to act solely for the use of the parking brake. To go with the aluminum option, we would have to cast an iron sleeve and insert that into the aluminium hat. This as explained before would offer minimial weight savings compared to what is intended here. The friction treatment also don't bond well to Aluminium.

G-force - There's no need for us to use this special method for the front rotors as there's no integrated drum parking brake in the front
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Old 03-26-2004, 12:02 PM   #17
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iON Performance Inc,

screw it, just tell me how much it is to make me a one off set, I'll go round up the cash........

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Old 03-26-2004, 01:07 PM   #18
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Quote:
Originally posted by iON Performance Inc
Patrick Olsen - aluminium does not have the right thermoproperties nor resistance to act solely for the use of the parking brake. To go with the aluminum option, we would have to cast an iron sleeve and insert that into the aluminium hat. This as explained before would offer minimial weight savings compared to what is intended here. The friction treatment also don't bond well to Aluminium.
Like Patrick was saying though, what kind of thermo properties do you NEED. Aslongas your parking brake is used...as a parking brake, who cares? Also, as far as enough resistance/friction, you could always apply the friction coating to the aluminum.

And think of it this way JDM...it will be even lighter without the titanium
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Old 03-26-2004, 01:11 PM   #19
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Quote:
Originally posted by Soontobe
Also, as far as enough resistance/friction, you could always apply the friction coating to the aluminum.
Quote:
Originally posted by iON Performance Inc
The friction treatment also don't bond well to Aluminium.
Quote:
Originally posted by Soontobe
And think of it this way JDM...it will be even lighter without the titanium
True but the parking brake won't work

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Old 03-26-2004, 01:13 PM   #20
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Ah, missed the friction treatment wouldn't bond to aluminum part. Either way, there HAS to be enough friction for parking brake use.
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