[Eagle7]

Well I just ordered a set; they were on sale plus I got $50 off for ordering for the first time. Price should be $1,110 for a full set; I'm waiting for confirmation from the seller.

I got an email from the seller that the website has an error; you can't choose the colors for the OEM replacement rotors. The rotors only come with the black anti-corrosion treatment on them like you see in A7f4's pic. You can't get them without that or change the color. I guess you can get either a silver or black hat since A7f4 got them in silver; I ordered black. I also chose the curved slots and holes. There are several choices for holes and slots including none.

It says on the website it takes 40 days to make a set plus 3-5 days for shipping. Shipping was free.

 

[A7f4]

Just had my rotors installed and now the car seems to be really bouncy over 100kmh.

Do you think this is a wheel balancing/alignment issue or do you think this is related to the new rotors?
@lockem ?

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[Eagle7]

Just had my rotors installed and now the car seems to be really bouncy over 100kmh.

Do you think this is a wheel balancing/alignment issue or do you think this is related to the new rotors?
@lockem ?

Sent from my iPhone using Tapatalk

Did you install them yourself or have it done elsewhere? Lighter rotors will in fact bring out even a slight imbalance in the wheels because the rotors aren't 'holding things down' as much so to speak. There's also the distinct possibility that the computer has to learn the changes, as it's currently expecting the weight and performance of the rotors that were on there. Got a pic of them installed?

 

[stocki]

Did you install them yourself or have it done elsewhere? Lighter rotors will in fact bring out even a slight imbalance in the wheels because the rotors aren't 'holding things down' as much so to speak. There's also the distinct possibility that the computer has to learn the changes, as it's currently expecting the weight and performance of the rotors that were on there. Got a pic of them installed?

I agree about your first point, but what does "the computer" (whatever you meant there) have to do with imbalances in the drivetrain?

 

[lockem]

Just had my rotors installed and now the car seems to be really bouncy over 100kmh.

Do you think this is a wheel balancing/alignment issue or do you think this is related to the new rotors?
@lockem ?

Sent from my iPhone using Tapatalk

I have experienced no bouncing issues with my car after installing the rotors. What I immediately noticed was a marked reduction in wheel hop during acceleration on rough roads. Braking performance has not been significantly different. I got slots only with my rotors. Besides the potential stress cracking issue, buildup in the holes has the potential to unbalance the rotor.

I was very careful during installation to ensure that the mating hub surface was clean and free of rust and that the braking surface is free of any grease--including finger grease. I scrubbed the rotors with a brush and soap and water before installation.

I have Tecnico 19x8.5 wheels with Michelin 245 35R19 PS A/S 3+ tires that were road force balanced by California Wheels on each corner.
I also have the adaptive suspension option, so my suspension damping is computer controlled.

 

[beaups]

Did you install them yourself or have it done elsewhere? Lighter rotors will in fact bring out even a slight imbalance in the wheels because the rotors aren't 'holding things down' as much so to speak. There's also the distinct possibility that the computer has to learn the changes, as it's currently expecting the weight and performance of the rotors that were on there. Got a pic of them installed?

I agree about your first point, but what does "the computer" (whatever you meant there) have to do with imbalances in the drivetrain?

If by bouncing you mean vibration, you have a balance issue, a defective rotor, or a wheel/rotor was reinstalled improperly. Either way you should get it checked out asap.

And no, there's no computer analyzing the weight of your rotors and making balance adjustments.

 

[Eagle7]

I agree about your first point, but what does "the computer" (whatever you meant there) have to do with imbalances in the drivetrain?

Considering that computers pretty much control the entire car, and they talk to each other constantly making adjustments as a result of the input they're receiving, I would not at all be surprised to find out that the performance of the suspension is monitored and adjusted by the systems that are on board. The performance of this chassis is way too good to be the result of just mechanical components. I expect that some of Ferrari's Formula 1 experience made its way in there. The body control module, traction control module, braking module, etc. are all computer control systems. Even the steering. The steering geometry actually adjusts itself depending on how you turn. All those modules perform on the basis of expected behaviors; if any of those behaviors change, they either throw a code or learn the changes and adjust accordingly.

The more I learn about this car, the more I can't believe they're selling it for what they do.

If the OP is able to determine which wheel is showing the issue, I'd check the balance of that wheel first, then if that doesn't cure the issue, check to see if the rotor is out of balance (which is possible). When you drill holes in the rotor, you're removing metal, and unless it's done exactly to the same measurements across the rotor, it's possible to create an imbalance. From the picture though, these rotors look like they're done right.

Oh and drivetrain is different from the suspension; drivetrain is everything connected to the engine down through the driven axles; clutch, trans, driveshaft, differential, axle shafts. The wheels and brakes are part of the suspension.

 

[beaups]

Considering that computers pretty much control the entire car, and they talk to each other constantly making adjustments as a result of the input they're receiving, I would not at all be surprised to find out that the performance of the suspension is monitored and adjusted by the systems that are on board. The performance of this chassis is way too good to be the result of just mechanical components. I expect that some of Ferrari's Formula 1 experience made its way in there. The body control module, traction control module, braking module, etc. are all computer control systems. Even the steering. The steering geometry actually adjusts itself depending on how you turn. All those modules perform on the basis of expected behaviors; if any of those behaviors change, they either throw a code or learn the changes and adjust accordingly.

The more I learn about this car, the more I can't believe they're selling it for what they do.

If the OP is able to determine which wheel is showing the issue, I'd check the balance of that wheel first, then if that doesn't cure the issue, check to see if the rotor is out of balance (which is possible). When you drill holes in the rotor, you're removing metal, and unless it's done exactly to the same measurements across the rotor, it's possible to create an imbalance. From the picture though, these rotors look like they're done right.

Oh and drivetrain is different from the suspension; drivetrain is everything connected to the engine down through the driven axles; clutch, trans, driveshaft, differential, axle shafts. The wheels and brakes are part of the suspension.

Pretty much every car has all of these same computer systems, they are nothing new. While I agree the steering and suspension is fantastic, there are no active adjustments happening to the steering geometry. And wheels are (the final) part of the drivetrain, not the suspension.

No computers or electronics are causing vibration or bouncing. It's going to be a balance or defect issue with the wheel, the rotor, or an installation issue.

 

[stocki]

Pretty much every car has all of these same computer systems, they are nothing new. While I agree the steering and suspension is fantastic, there are no active adjustments happening to the steering geometry. And wheels are (the final) part of the drivetrain, not the suspension.



No computers or electronics are causing vibration or bouncing. It's going to be a balance or defect issue with the wheel, the rotor, or an installation issue.

Thank you - I intended to write something very similar.

Not trying to bash on @Eagle7 and I really admire our cars, but things like wheels, tires or rotors out of balance have nothing to do with any "computer".

Same goes for the steering geometry. Electrically assisted power steering has nothing to do with the way the geometry changes depending on steering angle. That is a result of the set up of all the mechanical components of the steering and suspension.

 

[John_K_348]

Last fall I determined that pads for the Giulia Ti were just about impossible to get. This included the rears for the Quad. I custom made a set and I'm seriously thinking of taking a welding class or just buying a bench top system. Rock Auto emailed me to tell me they were out of stock and unavailable. No back orders.

 

[Eagle7]

Thank you - I intended to write something very similar.

Not trying to bash on @Eagle7 and I really admire our cars, but things like wheels, tires or rotors out of balance have nothing to do with any "computer".

Same goes for the steering geometry. Electrically assisted power steering has nothing to do with the way the geometry changes depending on steering angle. That is a result of the set up of all the mechanical components of the steering and suspension.

Here:

https://translate.googleusercontent...0186,15700190,15700201,15700237,15700242&usg=ALkJrhhOsrvO9xXm8jrJ2xrGqPNEkcRQPA

I remember reading this last year and it took me awhile to find it again. There's some really interesting info from some of the people who designed and created these cars, including steering, transmission behavior, power transfer and other things. Agreed that an out of balance tire or rotor is its own issue, but what I was referring to was the change in weight at the corner of the suspension which changes how the suspension behaves and how quickly it reacts. That is something that the computers on board might be monitoring. I don't know if they are or not, but since they monitor grip, slip, tire pressure and as that article explains, do all kinds of things with the trans and distribution of power in response; especially on an AWD model, I wouldn't be surprised if they're doing other things we don't know about. A pretty impressive car.

 

[lockem]

Pretty much every car has all of these same computer systems, they are nothing new. While I agree the steering and suspension is fantastic, there are no active adjustments happening to the steering geometry. And wheels are (the final) part of the drivetrain, not the suspension.

No computers or electronics are causing vibration or bouncing. It's going to be a balance or defect issue with the wheel, the rotor, or an installation issue.

Sorry but wheels, hubs, brakes and rotors are both part of the driveline and suspension. This is why there is a disproportionate gain in performance when they are lightened; a single change benefits multiple systems.

If you have the adaptive suspension a computer controls suspension damping. IMO, if you *add* weight this has the potential to do some bad things, but by removing weight I do not see how it is likely to make anything worse. Since the tire is part of the shock absorption system, a large change in tire inflation pressure also has the potential to mess up the suspension performance.

 

[A7f4]

Thanks for all the feedback everyone. Seems to have been as a result of the wheel not making good contact with the spacers as they are not hub centric.

I’ve just picked up the car but so far so good. If the problem persists I will get hub centric spacers or new wheels.

I have the adaptive suspension but they were modified as a result of the air suspension setup


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[beaups]

Sorry but wheels, hubs, brakes and rotors are both part of the driveline and suspension. This is why there is a disproportionate gain in performance when they are lightened; a single change benefits multiple systems.

If you have the adaptive suspension a computer controls suspension damping. IMO, if you *add* weight this has the potential to do some bad things, but by removing weight I do not see how it is likely to make anything worse. Since the tire is part of the shock absorption system, a large change in tire inflation pressure also has the potential to mess up the suspension performance.

While the wheels are brakes attached to suspension components and can impact suspension performance, they are generally not considered part of the suspension. For instance, if you were to browse the suspension category in a parts catalog, you aren't going to find wheels or brake rotors.

Adding or removing weight could cause a small amount of change in suspension, agreed. But it won't cause vibration unless there's a defect or installation issue of some sort, which the poster already confirmed.

Also, a pound or two or rotor weight is pretty small relative to the total weight of the tire, wheel, and rotor. The weight of the rotor is also much more concentrated toward the center, which greatly reduces its impact on the rotating mass benefits that everyone likes to talk about. That pound or two would be much more effective if it was removed from the wheel or the tire.

 

[lockem]

While the wheels are brakes attached to suspension components and can impact suspension performance, they are generally not considered part of the suspension. For instance, if you were to browse the suspension category in a parts catalog, you aren't going to find wheels or brake rotors.

Adding or removing weight could cause a small amount of change in suspension, agreed. But it won't cause vibration unless there's a defect or installation issue of some sort, which the poster already confirmed.

Also, a pound or two or rotor weight is pretty small relative to the total weight of the tire, wheel, and rotor. The weight of the rotor is also much more concentrated toward the center, which greatly reduces its impact on the rotating mass benefits that everyone likes to talk about. That pound or two would be much more effective if it was removed from the wheel or the tire.

The front Ceika rotors are over 5 pounds lighter than OEM, each; a reduction of 5-7% of the unsprung weight. Shaving weight off of the tire or wheel is difficult without going to Corsa type tires and all of the downsides that go with that (durability, temperature range, cost, tendency to fling debris at the car). The effect of unsprung weight on wheel hop is not linear with the weight. I don't think anyone is this thread stated the Ceika rotors were helping with rotating mass (moment of inertia is the correct term in this context). Most of the weight reduction is in the hat, which has a small radius and therefor a small moment of inertia.

Just because parts suppliers classify wheels and rotors as driveline parts does not mean that they are not part of the suspension. After all the tire is obviously part of the suspension and the wheel and hub is between the tire and the suspension springs.

A7f4 now says he has air bags with adaptive suspension. I suspect that his issues are related to the air bags and not the light weight rotors. The light weight rotors may have made an issue more evident though.

 

[beaups]

The front Ceika rotors are over 5 pounds lighter than OEM, each; a reduction of 5-7% of the unsprung weight. Shaving weight off of the tire or wheel is difficult without going to Corsa type tires and all of the downsides that go with that (durability, temperature range, cost, tendency to fling debris at the car). The effect of unsprung weight on wheel hop is not linear with the weight. I don't think anyone is this thread stated the Ceika rotors were helping with rotating mass (moment of inertia is the correct term in this context). Most of the weight reduction is in the hat, which has a small radius and therefor a small moment of inertia.

Just because parts suppliers classify wheels and rotors as driveline parts does not mean that they are not part of the suspension. After all the tire is obviously part of the suspension and the wheel and hub is between the tire and the suspension springs.

A7f4 now says he has air bags with adaptive suspension. I suspect that his issues are related to the air bags and not the light weight rotors. The light weight rotors may have made an issue more evident though.

He already confirmed the issue was his spacers, and vibration is not remotely the same thing as wheel hop.

 

[Racer Z]

Last fall I determined that pads for the Giulia Ti were just about impossible to get. This included the rears for the Quad. I custom made a set and I'm seriously thinking of taking a welding class or just buying a bench top system. Rock Auto emailed me to tell me they were out of stock and unavailable. No back orders.

Within the last month, Tarox has released front pads to fit the Ti. The rear pads should be available by now. I've had the fronts on my Ti for about three weeks now. Alfa9 is a Tarox dealer.

https://www.giuliaforums.com/forum/802-vendor-deals/43340-giulia-2-0-t-brakes-tarox-italy.html

 

[Eagle7]

Within the last month, Tarox has released front pads to fit the Ti. The rear pads should be available by now. I've had the fronts on my Ti for about three weeks now. Alfa9 is a Tarox dealer.

https://www.giuliaforums.com/forum/802-vendor-deals/43340-giulia-2-0-t-brakes-tarox-italy.html

Driving impressions?

 

[Racer Z]

Driving impressions?

They're good. I only have a few hundred miles on them around town. I cooked the stock pads at the track, no surprise there. I can definitely tell the difference between the old charcoal pads and the new fresh pads. They were about half the price of OEM pads.

 

[lockem]

Silly question: If QV rear brake calipers are the same as 2.0T front brake calipers, are the rotors also the same dimensions? The QV co-cast light weight iron rotors might be competitive with Ceika.