441LSXTT

I just ordered Baers two piece rotors for front and back for my 08 ZO6. Does anybody know the weight difference between the 2 front rotors and the back rotors? Each?? I think the stock front ones are 26 LBS each. Baer website does not give the weight.

MTPZ06

Don't recall seeing specs on those...using stock calipers correct? I imagine you'll realize some weight savings over OE rotors. Coleman two piece shave ~32 lbs off the car at all 4 corners, while racing brake's two piece rotors shave ~26 lbs off the car. If the Baer's aren't in that range, I'd say cancel the order and go with one of those instead.

HOXXOH

Reducing weight with rotors is a crap shoot. The important part to understand is how the weight distribution is from the center. If the majority of weight reduction is near the hub, taking the carpet out of the truck/hatch is probably more effective.

If you want to drop weight with rotors, swap to base brakes and save caliper weight too.

VLCTY

Wrong... Switching from factory Z06 rotors to lighter aftermarket rotors (from PerformanceFX) can save as much as 6lbs of unsprung weight per corner, which is equivalent to removing over 100+lbs of sprung weight. It's a noticeable performance improvement on a Z06. Also, replacing the factory aluminum six piston calipers with cast steel single piston "base brakes" would be an absurd modification. I never heard of anyone doing that to a Z.

I hope your comments were meant to be tongue and cheek! Either way, it's all good.

Unreal

Tom is spot on actually. And for someone wanting straight line/drag/etc base brakes are a much better "upgrade".

I noticed no difference at all doing the light weight rotors. The weight is all around the center, so it is no where near the same as remove weight from a wheel/etc.

Ghost Knight

Look up MOI. The further away the mass is from the fulcrum, the more torque it takes to turn. Same as holding 5lbs near your chest versus in an outstretched arm. This is why removing weight from tires (assuming same diameter) can improve acceleration more than the same weight from wheels (depending on where the mass is).

User Omega

I have not heard this side of the story either to be fair. I would be interested in the science behind this as I was planning on dumping 2K into AFX rotors this winter if I didn't find a set used.

Everything I read supports unsprung weight being significant help. More so on road course but also in straight line performance.

Any runs to back up either way?

reasonable suspicion

I thought no-one sold Coleman rotors anymore

User Omega

Performance AFX Motorsports sells them. http://shop.performanceafx.com/C6-Z06_c14.htm

VLCTY

Ummmm... So you guys are recommending that the OP replace his factory Z06 aluminum 6 piston calipers and aftermarket, lightweight steel & aluminum rotors with base model brakes and removing trunk carpet to improve performance? Why would anyone do that?? Straight line racing or road racing, doesn't matter. Taking 24lbs of unsprung weight off any car with superior rotors is a good thing.

Regardless, I didn't see where the OP said anything about drag racing his Z.

Unreal

In theory do they help, yep. Is it noticeable in any way, not at all. Go ahead and spend $2k on them if you want, but odds are you won't notice a thing.

If we are talking unlimited budget, go ahead, do them.

If you are talking max performance for the dollar, and his concern is only straight line, he can sell the stock z06 brakes for $100, spend $200 on base brakes, save more weight and have $800 to spend on other parts.

Or he can spend $800-2000 on something that is basically does nothing.

I do have the colemans on my car, been there done that, one of the most useless mods I've done. I rather have a few nicer steak dinners than waste that money again.


And you say superior rotors? In what way? For drag racing, the base rotors are going to be better. Less weight, and less MOI.

User Omega

Want to sell your Colemans?

VLCTY

The rotors from Performance AFX are really nice pieces. 100% made in America. Nothing comes close to these Z06 replacement rotors.

Unreal

Nope, because they are on there and I don't want to mess with my car.

They are at the bottom of $/performance ratio of any mod I've ever done, by far. If you are find spending that money, go for it, but there is simply better places to put $2k into the car than rotors, that wear out.

HOXXOH

Here's a good article that discusses rotational weight. As you can see the ratio of rotational vs static for rotors is nearly insignificant when compared to wheels or tires.
hpwizard.com/rotational-inertia.html
Base rotors for drags work well (Norm with 9.46 @ 139.80 #2 on the internal list), but suck for the road course where heat is the enemy.

If you're interested in some static weight testing for drags, I did this several years ago.
https://www.corvetteforum.com/forums...ght-tests.html