Factory Tour Thread

[SlavaUkraini]

Can we get a pic dump of all the ones taken today? Or can someone point me in the direction of that thread?

Nice try, Gavan.

 

[DerTheDer]

Nice try, Gavan.

Busted.

 

[DrD]

Can we get a pic dump of all the ones taken today? Or can someone point me in the direction of that thread?

It looks like there's no real new shots from the last day or so. I think a few dealers may have had a little telling off about prematurely releasing photos. Shame really....

 

[DaaS]

Am I imagining it or are the rotors both drilled and slotted?

Zoom the shadow grey car.

 

[SlavaUkraini]

Am I imagining it or are the rotors both drilled and slotted?

I bet production will be slotted. Drilled is no good for track. Brembo and AP are going away from it

 

[NicolasB]

I bet production will be slotted. Drilled is no good for track. Brembo and AP are going away from it

They are both

 

[Next Decade]

I found Senna one dimensional and Hethel just plain and shouty. Verdant and Shadow moody elegant, magma eye popping warm vibrant and Nimbus clever!

Off topic but I appreciate seeing another 9-3 owner who also is in line for the Emira

 

[Cutting42]

Birthday trip to the Factory booked for the afternoon of the 1st June with the Wife. Picked my colour (Seneca) already but still holding a candle for Magma. Maybe see another from here!

 

[SteveB]

I bet production will be slotted. Drilled is no good for track. Brembo and AP are going away from it

Drilled discs can develop small stress cracks around the holes. If the cracks enlarge and join up it can result in catastrophic failure of the disc. Drilled discs should be inspected on a regular basis for evidence of cracking around the holes and replaced if any significant damage found. Slotted discs (not drilled) are much more resistant to stress fractures and provide an acceptable level of gas clearance/removal of dust etc.

 

[eclat2emira]

Drilled discs can develop small stress cracks around the holes. If the cracks enlarge and join up it can result in catastrophic failure of the disc. Drilled discs should be inspected on a regular basis for evidence of cracking around the holes and replaced if any significant damage found. Slotted discs (not drilled) are much more resistant to stress fractures and provide an acceptable level of gas clearance/removal of dust etc.

Every day is a school day!

 

[eclat2emira]

Birthday trip to the Factory booked for the afternoon of the 1st June with the Wife. Picked my colour (Seneca) already but still holding a candle for Magma. Maybe see another from here!

I hope you get to see all the colours you need to indoors and out.

 

[digilotus]

They are both

Are we sure they are drilled through or are they pitted and slotted?

 

[NicolasB]

Are we sure they are drilled through or are they pitted and slotted?

Don't know that, I just see the drill holes and the slots cut. Don't have a close enough photo to tell.

 

[SlavaUkraini]

Drilled discs can develop small stress cracks around the holes. If the cracks enlarge and join up it can result in catastrophic failure of the disc. Drilled discs should be inspected on a regular basis for evidence of cracking around the holes and replaced if any significant damage found. Slotted discs (not drilled) are much more resistant to stress fractures and provide an acceptable level of gas clearance/removal of dust etc.

Yep. The drilled cake up with brake dust during heavy track use and actually do the opposite of what they are intended to do. The heat has nowhere to go and they end up forming cracks like you said. It’s a shame the GT4 still comes with them, as the supplier of the rotors is moving away.

My initial feeling was that when the rotors for the Emira were first supplied they may have been drilled but then they moved to slotted, but I do not know for sure. I would prefer slotted (even though I’m not getting one for now - I continue to wish for this cars success). At the end of the day it’s not the end of the world, most people who track it will get them replaced anyway, and most owners probably won’t track it anyway. HPDE owners won’t have anything to worry about with drilled as it shouldn’t take enough abuse I don’t think to cause issues.

 

[kitkat]

I’m not sure why they don’t just put AP rings on there with their patented j hooks.

 

[SteveB]

Don't know that, I just see the drill holes and the slots cut. Don't have a close enough photo to tell.

From a photo I took at a viewing at Hethel last year the front discs were drilled through but not slotted.

 

[NickR]

From a photo I took at a viewing at Hethel last year the front discs were drilled through but not slotted.

Just saw drilled disks when on the factory tour. BtW the argument around cracks on drill holes is not really science. Why do you think boats have round portholes? A 90° corner is much more likely to get stress fractures.

 

[kitkat]

Yeah I get cracks on my rotors from track use regardless of blank, drilled, slotted, or j hook. Very little difference between the three in terms of longevity.

Drilled does a better job at expelling the brake pad vaporization, but deposits build up and once cracks do start forming across the rotor face, they tend to maybe build to larger cracks in a slightly shorter amount of time.

 

[NicolasB]

Yeah I get cracks on my rotors from track use regardless of blank, drilled, slotted, or j hook. Very little difference between the three in terms of longevity.

Drilled does a better job at expelling the brake pad vaporization, but deposits build up and once cracks do start forming across the rotor face, they tend to maybe build to larger cracks in a slightly shorter amount of time.

Just have to drill them out once in a while to remove build-up perhaps?

 

[SteveB]

Just saw drilled disks when on the factory tour. BtW the argument around cracks on drill holes is not really science. Why do you think boats have round portholes? A 90° corner is much more likely to get stress fractures.

Agree angles more likely than curves to develop fractures when stressed and drilling a hole can stop crack propagation - however from experience drilled brake discs develop stress fractures radiating out from the drilled holes. Not entirely sure of the reason why, possibly a consequence of repeated heating and cooling cycles and localised differences in metal expansion and contraction in the vicinity of the holes.