[davidmct-M3]

Originally Posted by aerobod

It also depends on the tyres, how much heat is in them and the brake pads and the road surface. If they did the test close to the acceleration tests, then the XM with AWD would likely have more grip in the front tyres due to them being warmer. The XM was likely on Pirelli P-Zero (PZ4) tyres, as all the 23" wheels in photos seem to have them. The M2 could have been on the same tyre or the Michelin PS4S.

It is all down to the tyres not weight. Police use skid marks to assess speed of accidents in uk independent of vehicle type involved.

[Lady Jane]

The M2 delivered despite the [silly] Ball Gown vs Jeans & T-Shirt show down.

[MKParris]

Originally Posted by Tenac

I'll have to do my own video when my M2 and Label Red comes in... lol Let the hazing begin!!

I cant believe they sold one

[///M TOWN]

Originally Posted by MKParris

I cant believe they sold one

There’s an ass for every seat

[Dgjo2022X5MC]

[QUOTE=Limegrntaln;30062236]I think the regen has a lot to do with the braking. That thing is 5,900lbs. No way standard steel brakes are going to stop it, like that. Doesn’t matter what size rotors and calipers it has.

I saw the brakes in person and they aren’t the same ones as in my 22 X5MC.

Not ventilated. Not sure about caliper design.

FWIW

[Tag]

Originally Posted by Limegrntaln

I think the regen has a lot to do with the braking. That thing is 5,900lbs. No way standard steel brakes are going to stop it, like that. Doesn’t matter what size rotors and calipers it has.

Originally Posted by Dgjo2022X5MC

I saw the brakes in person and they aren’t the same ones as in my 22 X5MC.

Not ventilated. Not sure about caliper design.

FWIW

It's got the same brake setup that are on other M cars.

Brakes, front: Six-piston fixed-calliper disc brakes, vented
Brakes, rear: Single-piston floating-calliper disc brakes, vented

Source: BMW XM – Specifications.PDF

At a certain point the size of the rotors and calipers don't matter for braking. Larger steel rotors are for dissipating heat and are less prone to brake fade over repeated stops, but they won't stop you any quicker. CCB also won't stop you any quicker, but they won't have any brake fade with the added benifit of less unsprung weight. On the XM it's the tires in conjunction with the regen that help it slow down so quickly.

[m2ss]

Originally Posted by Luminor513

I think the X5M comp is a better M SUV proposition.

Yeah, BMW's foray into the short bus market may be short lived...

[Evinrude1975]

I feel such an old dog because I cannot explain to myself how this individual can make so much money making these videos. 🤷🏻‍♂️

[aerobod]

Originally Posted by Tag

It's got the same brake setup that are on other M cars.

Brakes, front: Six-piston fixed-calliper disc brakes, vented
Brakes, rear: Single-piston floating-calliper disc brakes, vented

Source: BMW XM – Specifications.PDF

At a certain point the size of the rotors and calipers don't matter for braking. Larger steel rotors are for dissipating heat and are less prone to brake fade over repeated stops, but they won't stop you any quicker. CCB also won't stop you any quicker, but they won't have any brake fade with the added benifit of less unsprung weight. On the XM it's the tires in conjunction with the regen that help it slow down so quickly.

This is also borne out by the fact that the steel rotors on a Boeing 737 (5 per main wheel) are about the same diameter as on the XM and manage to give an average of about 0.5g stop from 250km/h (180mph) with no reverse thrust and a landing weight of about 40 tonnes.

[aerobod]

Originally Posted by Tag

It's got the same brake setup that are on other M cars.

Brakes, front: Six-piston fixed-calliper disc brakes, vented
Brakes, rear: Single-piston floating-calliper disc brakes, vented

Source: BMW XM – Specifications.PDF

At a certain point the size of the rotors and calipers don't matter for braking. Larger steel rotors are for dissipating heat and are less prone to brake fade over repeated stops, but they won't stop you any quicker. CCB also won't stop you any quicker, but they won't have any brake fade with the added benifit of less unsprung weight. On the XM it's the tires in conjunction with the regen that help it slow down so quickly.

This is also borne out by the fact that the steel rotors on a Boeing 737 (5 per main wheel) are about the same diameter as on the XM and manage to give an average of about 0.5g stop from 250km/h (160mph) with no reverse thrust and a landing weight of about 40 tonnes.

[NSX2M4]

BMW pork converter test.

[Dgjo2022X5MC]

Originally Posted by Tag

It's got the same brake setup that are on other M cars.

Brakes, front: Six-piston fixed-calliper disc brakes, vented
Brakes, rear: Single-piston floating-calliper disc brakes, vented

Source: BMW XM – Specifications.PDF

At a certain point the size of the rotors and calipers don't matter for braking. Larger steel rotors are for dissipating heat and are less prone to brake fade over repeated stops, but they won't stop you any quicker. CCB also won't stop you any quicker, but they won't have any brake fade with the added benifit of less unsprung weight. On the XM it's the tires in conjunction with the regen that help it slow down so quickly.

Don’t think so (same setup as other m cars). They aren’t drilled. Front or back. They certainly have center ventilation, but not the cross drilling. The rotor design is completely different as I saw it up close. Same 6 piston Brembo caliper makes sense. They seem to work just fine though!

[bromudez]

Originally Posted by Mako

XM should be so much faster for the price. Seems like a Cayanne GT will smoke it, maybe that’s the label red…
For how heavy it is they should have just made it a 1200hp full electric suv

I mean even a Macan GTS probably will…

[Amgeater2]

Originally Posted by NathObeaN

Sums up BMW’s lack of clear direction. There is nothing ‘M’ about the XM other than the engine. And the only reason it has such a big engine is to overcome the bloated pig that it is. The fact they made the XM their ‘Halo’ car is an insult to everything M stands for .

I agree ☝️ but let’s not forget all this Non M cars with M badges from the factory line, that it’s a bigger insult than this SUV

[bimmer456]

Model x plaid would have won by a mile all races. Xm is just a hybrid so need to think in those terms.

[julienjj]

Originally Posted by aerobod

This is also borne out by the fact that the steel rotors on a Boeing 737 (5 per main wheel) are about the same diameter as on the XM and manage to give an average of about 0.5g stop from 250km/h (160mph) with no reverse thrust and a landing weight of about 40 tonnes.

They have 5 rotors per wheels but also the pads cover almost the whole rotor. A 737 is basically 15 XM in mass.

I don't think that's flattering for the XM that we are comparing stats with an airplane

[aerobod]

Originally Posted by julienjj

They have 5 rotors per wheels but also the pads cover almost the whole rotor. A 737 is basically 15 XM in mass.

I don't think that's flattering for the XM that we are comparing stats with an airplane

The thermal capacity and lever arm is more important than the pad area, though. Friction from a limited or full pad area can be the same, as it is proportional to applied pressure, not pad area. There is also no venting on the B737 rotors, though, so you will only get one stop at max braking, assuming the tyres don’t blow if autobrake isn’t armed.

The comparison is related to steel brakes being inadequate for heavy vehicles, which isn’t necessarily the case, carbon brakes can have advantages (though marginal as an option on a B737) but a properly engineered steel system can work well, too.

[-cj-]

Originally Posted by Mako

XM should be so much faster for the price. Seems like a Cayanne GT will smoke it, maybe that’s the label red…
For how heavy it is they should have just made it a 1200hp full electric suv

Cayenne GT will smoke even the Label Red, from what I can tell..

Originally Posted by bimmer456

Model x plaid would have won by a mile all races. Xm is just a hybrid so need to think in those terms.

"All races" -- Have you seen how well the Plaid vehicles come to a stop?

[aerobod]

Originally Posted by -cj-

"All races" -- Have you seen how well the Plaid vehicles come to a stop?

Yes, I think the best measure of performance is the 0-200-0 km/h (0-124-0 mph) test. The best road cars should be close to 10 seconds.

[///M TOWN]

Super cool Matt & Joe were able to make it all the way to Arizona

The roads are great in AZ right now… definitely a perfect place to test cars

[GOLFFRR]

interesting comparison. XM is just so much heavier

[somer]

The whole vehicle is just a waste of effort, imagine the man-hours involved in creating it? Just dump the extra effort into the new M5 if you're so committed to PHEV technology in the ///M vehicle space.

Maybe slightly off-topic but I really think the LCI X6M/X5M will be a pretty desirable vehicle in the coming decade, it will be the only high output version of the S68 without "full" electrification. Could be similar to the old 4.6is/4.8is.