BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > Suspension | Brakes | Chassis
 
European Auto Source
Post Reply
 
Thread Tools Search this Thread
      05-18-2009, 08:57 AM   #111
SenorFunkyPants
Colonel
SenorFunkyPants's Avatar
United Kingdom
46
Rep
2,770
Posts

Drives: E92 DCT M3
Join Date: Mar 2009
Location: UK

iTrader: (0)

Quote:
Originally Posted by AP Racing - Chris_B View Post
If you assume tire grip is the same, the brake system still needs to overcome the rotational inertia of each wheel/tire. This gets substantially more difficult at the higher speed since the rotational kinetic energy is also 4x higher. You can maintain a relatively constant deceleration rate, but to lock up a tire at 150mph will usually take more effort than at 75mph.
Its the "more effort" that I'm trying to get an idea of....is it 10% 50% 200% more? I realise that an exact figure is not something anyone is going to be able to pull out of the air but approx would do. I'm trying to get a better understanding of the forces involved in braking relative to speed. I know I can easily trigger the ABS on my M3 at 100mph but would there be a speed at which I couldn't?
Appreciate 0
      05-18-2009, 12:33 PM   #112
AP Racing - Chris_B
Brake Maven
AP Racing - Chris_B's Avatar
United_States
2
Rep
229
Posts

Drives: E34 540i/6, others
Join Date: Jan 2009
Location: SoCal

iTrader: (0)

Quote:
Originally Posted by SenorFunkyPants View Post
Its the "more effort" that I'm trying to get an idea of....is it 10% 50% 200% more? I realise that an exact figure is not something anyone is going to be able to pull out of the air but approx would do. I'm trying to get a better understanding of the forces involved in braking relative to speed. I know I can easily trigger the ABS on my M3 at 100mph but would there be a speed at which I couldn't?
You are right about coming up with an exact figure! There are a ton of interdependent variables that cannot be easily accounted for, which is why testing is always necessary. In my experience, it will take more effort at higher speeds. This is a good thing, because we don't like flat spotted tires. Of course the actual amount of increase depends on the initial bite the pads and rotors have at that particular temperature, track and tire temps, road surface, shock settings, how much ale was consumed the night before.........
Appreciate 0
      05-19-2009, 08:53 PM   #113
lucid
Major General
lucid's Avatar
United_States
117
Rep
8,034
Posts

Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

iTrader: (0)

Quote:
Originally Posted by sparkyg View Post
I measured the weights of the kit

365 mm slotted rotor 24.5 lbs

6 pot monobloc front caliper 12 lbs

front caliper bracket 2.0 lbs



345 mm slotted rotor 15 lbs

4 pot rear monobloc caliper 8 lbs

Rear caliper bracket 1.5 lbs

All weights measured on digital scale used for shipping so prob +- 0.5 lbs
Thanks for the update on the brackets.
__________________
Appreciate 0
      05-25-2009, 08:15 PM   #114
lucid
Major General
lucid's Avatar
United_States
117
Rep
8,034
Posts

Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

iTrader: (0)

Quote:
Originally Posted by sparkyg View Post
I measured the weights of the kit

365 mm slotted rotor 24.5 lbs

6 pot monobloc front caliper 12 lbs

front caliper bracket 2.0 lbs



345 mm slotted rotor 15 lbs

4 pot rear monobloc caliper 8 lbs

Rear caliper bracket 1.5 lbs

All weights measured on digital scale used for shipping so prob +- 0.5 lbs
It just occured to me ask about the pads. Do your caliper numbers include pads? Thanks.
__________________
Appreciate 0
      05-30-2009, 02:53 PM   #115
Gary@RENN-Spec
Captain
Gary@RENN-Spec's Avatar
United_States
25
Rep
812
Posts

Drives: E90 M3
Join Date: Mar 2008
Location: Los Angeles

iTrader: (4)

Send a message via AIM to Gary@RENN-Spec Send a message via MSN to Gary@RENN-Spec
In response to whether the 365/345 Brembo kits clears OEM 18" wheels:

We just finished fitting these behind the OEM 18". The spokes of the wheels clear the calipers with no problem. There's plenty of room left; however, the brake lines on the calipers are very close to the balancing weights on the stock wheels (see below pictures).

We recommend going with a minimum of 5mm spacers if you wish to keep the original balancing weights; otherwise the front wheels will need to be re-balanced with low profile balancing weights.

The rears will have zero issues.


Here are some photos of the fitting:
















Appreciate 0
      05-30-2009, 03:31 PM   #116
sparkyg
Brigadier General
sparkyg's Avatar
Canada
48
Rep
3,493
Posts

Drives: EBII 2014 F31 328xi
Join Date: Sep 2007
Location: Oil Country

iTrader: (5)

Quote:
Originally Posted by lucid View Post
It just occured to me ask about the pads. Do your caliper numbers include pads? Thanks.
Yes include pads.
Appreciate 0
      05-30-2009, 03:33 PM   #117
sparkyg
Brigadier General
sparkyg's Avatar
Canada
48
Rep
3,493
Posts

Drives: EBII 2014 F31 328xi
Join Date: Sep 2007
Location: Oil Country

iTrader: (5)

Quote:
Originally Posted by Gary@RENN-Spec View Post
In response to whether the 365/345 Brembo kits clears OEM 18" wheels:

We just finished fitting these behind the OEM 18". The spokes of the wheels clear the calipers with no problem. There's plenty of room left; however, the brake lines on the calipers are very close to the balancing weights on the stock wheels (see below pictures).

We recommend going with a minimum of 5mm spacers if you wish to keep the original balancing weights; otherwise the front wheels will need to be re-balanced with low profile balancing weights.

The rears will have zero issues.
Thx Gary, that's awesome news. Will do on the low profile wheel weights
Appreciate 0
      05-31-2009, 08:03 AM   #118
lucid
Major General
lucid's Avatar
United_States
117
Rep
8,034
Posts

Drives: E30 M3; Expedition
Join Date: Apr 2007
Location: USA

iTrader: (0)

Quote:
Originally Posted by sparkyg View Post
Yes include pads.
Thanks. Added the specs you provided to the weight savings thread.
__________________
Appreciate 0
      10-26-2009, 04:46 PM   #119
sparkyg
Brigadier General
sparkyg's Avatar
Canada
48
Rep
3,493
Posts

Drives: EBII 2014 F31 328xi
Join Date: Sep 2007
Location: Oil Country

iTrader: (5)

Putting winter tires on today and as Gary said you MUST change wheel weights to low profile if you have any weights on the farthest outward (away from car) side of the rim.

Any standard wheel weight will have 1-2 mm clearance on the bleed port but <1mm clearance on the brake lines.

Otherwise the fitment is great.

I am not sure how the AP 368mm kit is gonna fit the stock wheels. It is that tight with the 365 mm front.
Appreciate 0
      10-27-2009, 04:47 PM   #120
Jaypod
Brigadier General
Jaypod's Avatar
No_Country
66
Rep
4,966
Posts

Drives: Frozen M3, AM V8V, 991 GT3
Join Date: Nov 2008
Location: Toronto

iTrader: (7)

Quote:
Originally Posted by sparkyg View Post
Putting winter tires on today and as Gary said you MUST change wheel weights to low profile if you have any weights on the farthest outward (away from car) side of the rim.

Any standard wheel weight will have 1-2 mm clearance on the bleed port but <1mm clearance on the brake lines.

Otherwise the fitment is great.

I am not sure how the AP 368mm kit is gonna fit the stock wheels. It is that tight with the 365 mm front.
I think I read that that 10mm spacers are required for the AP kit on the front to fit the stock 18's
Appreciate 0
      10-28-2009, 11:03 AM   #121
TOOMANYCARS
Second Lieutenant
TOOMANYCARS's Avatar
2
Rep
221
Posts

Drives: 2009 E92 M3
Join Date: Aug 2009
Location: V.O.W

iTrader: (0)

That's mighty close. I suggest a 10mm spacer is required with the 365mm front kit if user plans to keep the stock 18s.
__________________
Everything is work in progress.
Appreciate 0
      10-31-2009, 10:57 AM   #122
sparkyg
Brigadier General
sparkyg's Avatar
Canada
48
Rep
3,493
Posts

Drives: EBII 2014 F31 328xi
Join Date: Sep 2007
Location: Oil Country

iTrader: (5)

Yeah a 10 mm spacer would certainly fix things but it is still close on the brake line.

Low profile wheel weights is a better investment and cheaper too.

Both are good solutions. I am not a fan of spacers
Appreciate 0
      01-07-2010, 05:20 PM   #123
STALKER
Brigadier General
52
Rep
3,702
Posts

Drives: 997.2 GT3, Golf R
Join Date: Feb 2009
Location: Toronto, ON

iTrader: (5)

Sparkyg,
Any more feedback on the Brembos.
__________________

2013 991 C4S-SOLD
2012 Golf R
2010 GT3
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 08:20 PM.




m3post
m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST