Even lighter rotors??

Chuck33079 · 03-18-2014, 11:53 AM

Quote:

Originally Posted by DEpointfive0

There is no direct, defined corresponding number between sprung and unsprung weight.

No, but there's a rule of thumb I learned long ago, and promptly forgot. As much of an issue as this car has with brake cooling, I'd be wary of making the heat sink too much smaller.

DEpointfive0 · 03-18-2014, 11:59 AM

I believe Rays says 1:5 for wheel weight loss, so I imagine for rotors it's less

Chuck33079 · 03-18-2014, 12:01 PM

Right, that's why I was remembering 1.4x- One pound lost from the rotor is about 1.4 pounds of unsprung weight lost. i.e., it's not as dramatic as we would want to believe. Will you notice a difference between stock and rotors 20 lbs lighter than stock? Absolutely. Will you notice a difference between rotors 20 lbs lighter than stock and rotors 21 lbs lighter than stock? Not a chance in hell.

synolimit · 03-18-2014, 12:10 PM

Quote:

Originally Posted by DEpointfive0

Lol, not 10 times.

But if you want a real improvement, shave your tires. The further out the weight is, the more valuable it is to lose

Rule of thumb is said to be 10 times. Or is it more? A pound off rotation is like 10 off the body? It adds up quick I know that!

synolimit · 03-18-2014, 12:12 PM

Quote:

Originally Posted by DEpointfive0

There is no direct, defined corresponding number between sprung and unsprung weight.

Rotors aren't the best way to shave the MOST MEANINGFUL weight though, tires are, then wheels, then rotors, heading inwards to the hub.

I've done tires, I've done wheels, now I am at the rotor yo!

synolimit · 03-18-2014, 12:13 PM

Quote:

Originally Posted by Chuck33079

No, but there's a rule of thumb I learned long ago, and promptly forgot. As much of an issue as this car has with brake cooling, I'd be wary of making the heat sink too much smaller.

See that's my main question.

synolimit · 03-18-2014, 12:14 PM

Quote:

Originally Posted by Chuck33079

Right, that's why I was remembering 1.4x- One pound lost from the rotor is about 1.4 pounds of unsprung weight lost. i.e., it's not as dramatic as we would want to believe. Will you notice a difference between stock and rotors 20 lbs lighter than stock? Absolutely. Will you notice a difference between rotors 20 lbs lighter than stock and rotors 21 lbs lighter than stock? Not a chance in hell.

But if you have money in hand and want to buy...take my money for the 21lbs

Chuck33079 · 03-18-2014, 12:15 PM

Quote:

Originally Posted by synolimit

Rule of thumb is said to be 10 times. Or is it more? A pound off rotation is like 10 off the body? It adds up quick I know that!

I'm thinking that's for rotational mass hanging off the crank like a pulley or flywheel. The rotors are nowhere near that much. That would mean that some of these two piece rotors claiming 20 lbs lighter than stock would be the equivalent of 200 lbs off the body, and that's a really bold statement.

synolimit · 03-18-2014, 12:20 PM

Quote:

Originally Posted by Chuck33079

I'm thinking that's for rotational mass hanging off the crank like a pulley or flywheel. The rotors are nowhere near that much. That would mean that some of these two piece rotors claiming 20 lbs lighter than stock would be the equivalent of 200 lbs off the body, and that's a really bold statement.

True. I was sad when I removed 35 total from the wheels yet I didn't put down 400HP like rule of thumb says, every pound is like 10HP too

Chuck33079 · 03-18-2014, 12:22 PM

Quote:

Originally Posted by synolimit

True. I was sad when I removed 35 total from the wheels yet I didn't put down 400HP like rule of thumb says, every pound is like 10HP too

Right. The 100 lbs=1 tenth in the 1/4 mile would mean you'd pick up two tenths just from a rotor swap, and I just don't see it happening. I wish, that's the best bang for the buck imaginable.

G37sHKS · 03-18-2014, 12:29 PM

So how come this thread became sprung vs unsprung?

I got forged rays wheels and felt huge improvement in everything I mean EVERYTHING. I will do it again and again without a doubt.

You get what you pay for.

Chuck33079 · 03-18-2014, 12:31 PM

Quote:

Originally Posted by G37sHKS

So how come this thread became sprung vs unsprung?

That's where the discussion always goes after we start talking about brake rotors.

Masterbeatty · 03-18-2014, 01:31 PM

i emailed thebrakeman for more clarification on his product and how much it would be for the kit on the ribosec 370z. i will post up his response.

martin82 · 03-18-2014, 01:47 PM

I messaged Robispec hopefully he can chime in or give me additional info.

synolimit · 03-18-2014, 01:54 PM

Is it a rotor or a two piece? I am weirded out now that DE pointed out its like half the pad has nothing to touch.

03-18-2014, 11:59 AM	#32 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17152	I believe Rays says 1:5 for wheel weight loss, so I imagine for rotors it's less __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

03-18-2014, 12:01 PM	#33 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	Right, that's why I was remembering 1.4x- One pound lost from the rotor is about 1.4 pounds of unsprung weight lost. i.e., it's not as dramatic as we would want to believe. Will you notice a difference between stock and rotors 20 lbs lighter than stock? Absolutely. Will you notice a difference between rotors 20 lbs lighter than stock and rotors 21 lbs lighter than stock? Not a chance in hell. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

03-18-2014, 12:29 PM	#41 (permalink)
G37sHKS A True Z Fanatic Join Date: Feb 2010 Location: Dubai Posts: 1,183 Drives: 09 G37S Coupe 7AT Rep Power: 21	So how come this thread became sprung vs unsprung? I got forged rays wheels and felt huge improvement in everything I mean EVERYTHING. I will do it again and again without a doubt. You get what you pay for. __________________ G37 BUILD UNDER CONSTRUCTION

03-18-2014, 01:31 PM	#43 (permalink)
Masterbeatty A True Z Fanatic Join Date: May 2012 Location: Whales Vagina Posts: 4,586 Drives: the speed limit... Rep Power: 122867	i emailed thebrakeman for more clarification on his product and how much it would be for the kit on the ribosec 370z. i will post up his response. __________________ 2011 MB 6MT Masterbeatty journal

03-18-2014, 01:54 PM	#45 (permalink)
synolimit A True Z Fanatic Join Date: May 2013 Location: Columbus, OH Posts: 5,051 Drives: 2013 Silver 370z Rep Power: 3389	Is it a rotor or a two piece? I am weirded out now that DE pointed out its like half the pad has nothing to touch. DEpointfive0 likes this. __________________ 13 370z-

03-18-2014, 01:47 PM	#44 (permalink)
martin82 A True Z Fanatic Join Date: Nov 2011 Location: los angeles Posts: 2,636 Drives: 12 Nissan 370Z MB M6 Rep Power: 20	I messaged Robispec hopefully he can chime in or give me additional info.

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