Bigger Brakes on 335i Sedan?

bmwexecutive · 10-09-2006, 06:41 PM

Anyone notice this? I think the rotor is the same size but the brake caliper is different.

335i

330i

inTgr8r · 10-09-2006, 07:10 PM

Rotor is bigger too.
same spec as the 335 coupe

new2the3 · 10-09-2006, 07:32 PM

13.7" I belive and 13.0" for 330i.

remmib · 10-09-2006, 10:40 PM

Quote:

Originally Posted by new2the3

13.7" I belive and 13.0" for 330i.

Yes, that's right

bmwexecutive · 10-09-2006, 11:08 PM

So what does this mean? Does the 335i have a shorter stopping distance? Why are the bigger rotor and brakes better?

smeff · 10-09-2006, 11:17 PM

The car has 306hp! Plus, it looks cooler.

Here are some more shots from my 335i Sedan of the brakes.

Ray · 10-09-2006, 11:18 PM

According to Car and Driver it is an improvement from 168ft to 157ft from 70mph.

bmwexecutive · 10-09-2006, 11:21 PM

Quote:

Originally Posted by ThreeThirtyEye

According to Car and Driver it is an improvement from 168ft to 157ft from 70mph.

Damn, that is pretty good---11 feet could easily mean hitting something versus not hitting it (although so could 1 foot I guess). What's the improvement from 60mph to 0mph? I think Edmunds.com said the 330i stops in 112ft from 60mph. Very close to the Porsche Cayman S which did it 60mph to 0mph in 108ft.

Ray · 10-09-2006, 11:27 PM

Don't know about the 60-0, but if I had a motor like that I'll need all the stopping power I can get.

bmwexecutive · 10-09-2006, 11:59 PM

Quote:

Originally Posted by ThreeThirtyEye

Don't know about the 60-0, but if I had a motor like that I'll need all the stopping power I can get.

Honestly, I don't know why a big engine automatically means you need big brakes. My 330i can get up to the same speed as any 335i, it will just take longer. Brakes aren't for stopping acceleration. They're for stopping speed. So a 330i and a 335i is the exact same in that aspect. Just because I've got a bigger engine under the hood doesn't mean I need bigger brakes with a car that can go just as fast. If I'm going 130MPH in my 330i, I'm going to need all the braking power I can get should I need to stop in a hurry. I don't know the exact number but traveling 130MPH, I'm guessing you'd need at least 300 to 400 feet of room to get back down to 0, ABS fully active the entire time. Anyone know exactly? All I can say is that you might need some new tires after braking that hard that far. The tires would probably melt or something. Haha.

Ray · 10-10-2006, 12:11 AM

Quote:

Originally Posted by bmwexecutive

Honestly, I don't know why a big engine automatically means you need big brakes. My 330i can get up to the same speed as any 335i, it will just take longer. Brakes aren't for stopping acceleration. They're for stopping speed. So a 330i and a 335i is the exact same in that aspect. Just because I've got a bigger engine under the hood doesn't mean I need bigger brakes with a car that can go just as fast. If I'm going 130MPH in my 330i, I'm going to need all the braking power I can get should I need to stop in a hurry. I don't know the exact number but traveling 130MPH, I'm guessing you'd need at least 300 to 400 feet of room to get back down to 0, ABS fully active the entire time. Anyone know exactly? All I can say is that you might need some new tires after braking that hard that far. The tires would probably melt or something. Haha.

I understand what you mean.

But auto manufacturers associate power with speed. And the more speed you can potentially gain, the more stopping power you may need.

I.e. Honda offers excellent brakes on the the S2000, but the Civic DX has an inferior system. They both can eventually reach 70mph, or 100mph even, but the Civic will probably need twice as much room to slow down from the same speed.

I agree that every car needs to have a good braking system, but manufacturers will factor the cars potential.

KevinC · 10-10-2006, 12:34 AM

The brakes on the 330i are already incredible, these new ones must be just awesome.

Generally accepted automotive principle that more power = more braking power required. If that weren't the case, you wouldn't see these aftermarket brake guys selling so many megadollar upgrades for cars that already have great brakes right out of the box.

Interesting that the calipers are different.. wonder who the manufacturer is and if it's different for each?

bmwexecutive · 10-10-2006, 01:02 AM

Quote:

Originally Posted by KevinC

The brakes on the 330i are already incredible, these new ones must be just awesome.

You should experience Porsche's Ceramic Braking System. It's an $8,000 option but they are extremely good. I'd hit myself if I didn't get that option if I were to get a Porsche simply because it's so good.

Robin_NL · 10-10-2006, 02:59 AM

Quote:

Originally Posted by bmwexecutive

Honestly, I don't know why a big engine automatically means you need big brakes. My 330i can get up to the same speed as any 335i, it will just take longer. Brakes aren't for stopping acceleration. They're for stopping speed. So a 330i and a 335i is the exact same in that aspect. Just because I've got a bigger engine under the hood doesn't mean I need bigger brakes with a car that can go just as fast. If I'm going 130MPH in my 330i, I'm going to need all the braking power I can get should I need to stop in a hurry. I don't know the exact number but traveling 130MPH, I'm guessing you'd need at least 300 to 400 feet of room to get back down to 0, ABS fully active the entire time. Anyone know exactly? All I can say is that you might need some new tires after braking that hard that far. The tires would probably melt or something. Haha.

Let me explain. I had a E46 M3, I now have my current E90 330i. My oncvoming 335i is 'equally' as fast as my former E46 M3 give or take a yard.

On trackdays:
The E46 M3 pulls like an idiot and you 've been traveling a far more distance out of a corner to the next in the M3(335i) than in the 330i, with a higher speed.

THUS You approach a bend faster(higher speed) than with the slower cars.
Shortly: You need better(bigger)brakes to stop/brake the more mph going faster car. It's easy as that.

I cannot explain it any better sorry

E90Fleet · 10-10-2006, 03:10 AM

335i disks are Front 348mm x 30mm, Rear 336mm x 22mm

330i disks are Front 330mm x 24mm, Rear 336mm x 22mm

cntlaw · 10-10-2006, 03:14 AM

I thought you all knew that from my posts?

PiperD · 10-10-2006, 11:20 AM

As has been said, more power = higher speed in a shorter distance. So that some dweeb who does a hail-mary lane change and cuts you off can brake harder before slamming into the car in front of him, whereas he may not even have tried the same move in a less powerful car.

ksfrogman · 10-10-2006, 11:25 AM

Don't forget the 335i coupe weighs more than the 330i sedan.

inTgr8r · 10-10-2006, 11:38 AM

Quote:

Originally Posted by ksfrogman

Don't forget the 335i coupe weighs more than the 330i sedan.

Exactly... nothing to do with power.
The larger the mass of the car, the more energy that needs to be absorbed & dissipated by the brakes.
Also the larger brake mass (caliper & rotor) give it better fade resistance.

PiperD · 10-10-2006, 11:44 AM

Quote:

Originally Posted by inTgr8r

Exactly... nothing to do with power.
The larger the mass of the car, the more energy that needs to be absorbed & dissipated by the brakes.
Also the larger brake mass (caliper & rotor) give it better fade resistance.

I have to agree to disagree. I was thinking along the same lines, but from bmw.ca:

328i (6MT) - 1520 kg - 300mm brakes
328xi (6MT) - 1625 kg - 300mm brakes
335i (6MT) - 1620kg - 348/336 mm brakes (f/r)

inTgr8r · 10-10-2006, 12:22 PM

Quote:

Originally Posted by PiperD

I have to agree to disagree. I was thinking along the same lines, but from bmw.ca:

328i (6MT) - 1520 kg - 300mm brakes
328xi (6MT) - 1625 kg - 300mm brakes
335i (6MT) - 1620kg - 348/336 mm brakes (f/r)

You have to factor the stopping distance for above.
335 hauls large mass to a shorter distance

NewMoses · 10-10-2006, 12:39 PM

Big calipers and rotor have almost NOTHING to do with stopping distance.

Brakes transfer kinetic energy into thermal energy. With aggressive driving, it's easy to overheat small brakes and boil the brake fluid giving a "spongy" brake feel. Big calipers and rotors serve as a heat sink. It's that simple.

I more than doubled the size of the calipers on my track car. The stopping distance is unchanged, but my brakes never overheat and get spongy. If the 335i has a shorter stopping distance, it is most likely due to a bigger tire and thus, a bigger contact patch.

10-09-2006, 06:41 PM	#1
bmwexecutive Banned 241 Rep 2,453 Posts Drives: 2006 330i Join Date: Apr 2006 Location: East Coast iTrader: (4)	Bigger Brakes on 335i Sedan? Anyone notice this? I think the rotor is the same size but the brake caliper is different. 335i 330i
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10-09-2006, 07:10 PM	#2
inTgr8r Lieutenant General 2432 Rep 11,667 Posts Drives: M2 Comp Join Date: Mar 2006 Location: Toronto iTrader: (10)	Rotor is bigger too. same spec as the 335 coupe
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10-09-2006, 07:32 PM	#3
new2the3 Colonel 382 Rep 2,067 Posts Drives: 2020 X3M Competition Join Date: Jun 2006 Location: San Diego iTrader: (0)	13.7" I belive and 13.0" for 330i.
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10-09-2006, 11:08 PM	#5
bmwexecutive Banned 241 Rep 2,453 Posts Drives: 2006 330i Join Date: Apr 2006 Location: East Coast iTrader: (4)	So what does this mean? Does the 335i have a shorter stopping distance? Why are the bigger rotor and brakes better?
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10-09-2006, 11:17 PM	#6
smeff Private 3 Rep 83 Posts Drives: E90 335i Sedan Join Date: Mar 2006 Location: Germany iTrader: (0)	The car has 306hp! Plus, it looks cooler. Here are some more shots from my 335i Sedan of the brakes.
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10-09-2006, 11:18 PM	#7
Ray Member 306 Rep 22,825 Posts Drives: three series Join Date: Aug 2006 Location: sfCA iTrader: (0)	According to Car and Driver it is an improvement from 168ft to 157ft from 70mph.
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10-09-2006, 11:27 PM	#9
Ray Member 306 Rep 22,825 Posts Drives: three series Join Date: Aug 2006 Location: sfCA iTrader: (0)	Don't know about the 60-0, but if I had a motor like that I'll need all the stopping power I can get.
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10-10-2006, 12:34 AM	#12
KevinC your average JAMF 3102 Rep 4,094 Posts Drives: '21 M2 Comp, '19 Golf R Join Date: Oct 2005 Location: Cochise County, AZ iTrader: (0) Garage List 2019 VW Golf R [0.00] 2021 BMW M2 Competi ... [0.00]	The brakes on the 330i are already incredible, these new ones must be just awesome. Generally accepted automotive principle that more power = more braking power required. If that weren't the case, you wouldn't see these aftermarket brake guys selling so many megadollar upgrades for cars that already have great brakes right out of the box. Interesting that the calipers are different.. wonder who the manufacturer is and if it's different for each? __________________ '21 M2 Comp '19 Golf R
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10-10-2006, 03:10 AM	#15
E90Fleet Lieutenant General 1312 Rep 10,185 Posts Drives: BMW Join Date: Apr 2005 Location: South Africa iTrader: (0)	335i disks are Front 348mm x 30mm, Rear 336mm x 22mm 330i disks are Front 330mm x 24mm, Rear 336mm x 22mm __________________ BMW if you are reading, I need a job, Please.
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10-10-2006, 03:14 AM	#16
cntlaw Major General 235 Rep 6,874 Posts Drives: 330i E90 C55 AMG Join Date: Sep 2005 Location: Hong Kong iTrader: (0) Garage List 2006 BMW 330i E90 [0.00] 2006 BMW 330i E90 [0.00] 2005 Mercedes Benz ... [0.00] 2002 Z3 2.2 USA Spo ... [0.00] 2002 Toyota MR-S Co ... [0.00]	I thought you all knew that from my posts? __________________ BMW 2006 330i E90 Jet Black/Black Leathers/Aluminium, Steptronic Active Steering; MTech Aero Kit Carbon Fibre Splitters/Diffuser. Bilstein PSS9 Coilover, Rays VOLK Racing RE30 Formula Limited Edition 18" Pirelli Rosso; Project Mu 355mm Forged 4pot Caliper. HID:Osram D1S 6000K, PIAA 6500K White Ring, Philips Diamond Vision HB4 5000K, PIAA H490/H491 Super Bright 6500K LED Interior Lights. Chrome S.Wheel Cover, Rear Windows Sunshades.
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10-10-2006, 11:20 AM	#17
PiperD Clutch pedal >> Dead pedal 18 Rep 709 Posts Drives: '11 e92 335is 6MT Join Date: Sep 2006 Location: GTA iTrader: (0) Garage List 2011 335is coupe [0.00] 2007 335i coupe [0.00]	As has been said, more power = higher speed in a shorter distance. So that some dweeb who does a hail-mary lane change and cuts you off can brake harder before slamming into the car in front of him, whereas he may not even have tried the same move in a less powerful car. __________________ In my garage: '11 e92 335is 6MT (05/10) SpGrey/CoralRed/GlacSlvr ExecPkg/NavPkg/19" 225M Retired: '07 e92 335i 6MT (12/06) SpklgGrpht/CoralRed/GreyPoplar Retired: '04 330Ci M-Sport 6MT SilverGrey/NaturalTan/MyrtleWood Retired: '00 328Ci 5MT SteelGrey/Grey/MyrtleWood Retired: '87 Pontiac Grand-Am 3AT White/Grey
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10-10-2006, 11:25 AM	#18
ksfrogman Major General 576 Rep 6,750 Posts Drives: E90 330i 6MT Join Date: Nov 2005 Location: Torrance, CA iTrader: (12) Garage List 2006 330i [0.00] 2006 330i [0.00]	Don't forget the 335i coupe weighs more than the 330i sedan. __________________
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10-10-2006, 12:39 PM	#22
NewMoses Enlisted Member 2 Rep 37 Posts Drives: 335i Join Date: Sep 2006 Location: SF Bay Area iTrader: (0)	Big calipers and rotor have almost NOTHING to do with stopping distance. Brakes transfer kinetic energy into thermal energy. With aggressive driving, it's easy to overheat small brakes and boil the brake fluid giving a "spongy" brake feel. Big calipers and rotors serve as a heat sink. It's that simple. I more than doubled the size of the calipers on my track car. The stopping distance is unchanged, but my brakes never overheat and get spongy. If the 335i has a shorter stopping distance, it is most likely due to a bigger tire and thus, a bigger contact patch.
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