[Jimminez]

This may be Canada specific but thought I'd see if anyone had some insight in this.

If the option list for a 328i M Sport with the M Performance ZPF package states the M Sport Brakes are 2NH (not S2NHA), should the front rotors be 370mm? Did the package content change and refer to 2NH and contain the 340mm fronts?

I've gone through the two links below and lots of various threads, mainly wondering if the contents within each package code changes.

http://www.turnermotorsport.com/t-br...fferences.aspx

http://www.turnermotorsport.com/t-br...fferences.aspx

[DrifterX]

I thought you can't get M sport on any of the 28i models in Canada?

Given my research, I think you'll still have the 340mm rotors up front because all US spec cars have this on the 28i models. Canada inherits the same specs because the AG code is the same amongst models (as far as I know). BTW, S2NHA is the same thing as 2NH contrary to what others have said.

My 428i GC /w M Sport Brakes is supposed to arrive at the dealer today so I'll be dropping by tomorrow to take a look at it. It's the first thing I'll be checking on the car because this whole 340mm vs. 370mm on 28i models question has been bugging me for a long time lol

[Jimminez]

You still can get M Sport models according to the online configuration tool, at least on Touring anyway. Whether or not you can order one, that's another question.

I know I have the 340mm though I thought I had the 370mm. I never actually bothered to look and check as according to the paperwork I presumed 2NH meant 370mm. I was fine with them as of yesterday morning, so I should be fine with them now.

As you say, S2NHA and 2NH could very well be the same here in Canada and US, but figure I'd find out why it's not consistent or if it ever changed.

[Bee Pee]

4cyl m sport - 340mm front rotors
6 cyl m sport - 370mm front rotors

[DrifterX]

Originally Posted by Jimminez

I know I have the 340mm though I thought I had the 370mm. I never actually bothered to look and check as according to the paperwork I presumed 2NH meant 370mm. I was fine with them as of yesterday morning, so I should be fine with them now.

As you say, S2NHA and 2NH could very well be the same here in Canada and US, but figure I'd find out why it's not consistent or if it ever changed.

I thought 2NH meant 370mm as well but this isn't necessarily true unfortunately. The S2NHA vs 2NH difference is dependent on the documentation you're looking at. If you go to a VIN decoder like www.bmwvin.com, it will say S2NHA on your car as well. If you look at your Vehicle Inquiry Report that you get from your dealer, it will only say 2NH.

Originally Posted by Bee Pee

4cyl m sport - 340mm front rotors
6 cyl m sport - 370mm front rotors

This is true for the USA/Candian market but isn't true for the European market, the 328i/428i get 370mm there

Edit: Side note, the M235i still gets 340mm front rotors even though it's got the 6 pot N55. Vehicle weight matters too.

[Jimminez]

Originally Posted by DrifterX

I thought 2NH meant 370mm as well but this isn't necessarily true unfortunately. The S2NHA vs 2NH difference is dependent on the documentation you're looking at. If you go to a VIN decoder like www.bmwvin.com, it will say S2NHA on your car as well. If you look at your Vehicle Inquiry Report that you get from your dealer, it will only say 2NH.

Well I guess if that's what it's suppose to be, and that's what the dealer tells you it will be, then shouldn't it be when the car is delivered? It's all after the fact for me, so it will be like pushing rope to have something come out of it but I have some time on my hands to see what happens.

But what if someone was ordering the car and they don't have a VIN to check. They go by all the info that is available that says 2NH which implies 370mm, then the car is delivered and it's not the what you expect. You have an option to walk away or have the dealer rectify it a variety of ways.

I'm in it to see what happens. I'm more than likely going to get a good ole "go suck an egg" from the dealer because it's been so long since I got the car and it wasn't ever an option regardless of the literature that they provided.

My options if they come back with a too bad so sad are:
1. Do nothing, and live with it.
2. Buy the 2NH blue calipers and blank rotors for roughly $1700 USD
3. Buy the M Performance kit for roughly $2400 USD. Since these are the same calipers as the 2NH blue, not much benefit.
4. Buy a set of aftermarket BBK like Brembo or Stoptech (though looks like Stoptech may not be available yet for my configuration.
5. Do nothing, and live with it.

In the end, I hope you get what you were hoping for.

[DrifterX]

Originally Posted by Jimminez

Well I guess if that's what it's suppose to be, and that's what the dealer tells you it will be, then shouldn't it be when the car is delivered? It's all after the fact for me, so it will be like pushing rope to have something come out of it but I have some time on my hands to see what happens.

Hahaha, the dealer doesn't know anything about details like this (based on my experience). I never bothered asking them because I'm not expecting a right answer from them.

Initially, it bothered me when I found out that I may not get 370mm rotors up front but I think the performance difference is marginal between 340mm vs. 370mm rotors for daily driving; the brake pad surface area is exactly the same for both. Doesn't really bother after I thought about it... there is a 4 lbs difference between 340mm and 370mm too (less rotational mass and unsprung weight). I bet you'd get better performance just by upgrading your brake pads on your current brakes with 340mm rotors.

[Jimminez]

Originally Posted by DrifterX

Hahaha, the dealer doesn't know anything about details like this (based on my experience). I never bothered asking them because I'm not expecting a right answer from them.

Initially, it bothered me when I found out that I may not get 370mm rotors up front but I think the performance difference is marginal between 340mm vs. 370mm rotors for daily driving; the brake pad surface area is exactly the same for both. Doesn't really bother after I thought about it... there is a 4 lbs difference between 340mm and 370mm too (less rotational mass and unsprung weight). I bet you'd get better performance just by upgrading your brake pads on your current brakes with 340mm rotors.

agreed

[DrifterX]

My car finally arrived at the dealership and I saw it yesterday; I can confirm that it has 340mm rotors up front as well. It's a 2015 428i GC Sport Line /w M Sport Brakes (2NH/S2NHA - it's the same thing for those who think otherwise).

Unfortunately, I didn't drive it and I can't take delivery for another 1.5 weeks

[Polo08816]

Originally Posted by DrifterX

Hahaha, the dealer doesn't know anything about details like this (based on my experience). I never bothered asking them because I'm not expecting a right answer from them.

Initially, it bothered me when I found out that I may not get 370mm rotors up front but I think the performance difference is marginal between 340mm vs. 370mm rotors for daily driving; the brake pad surface area is exactly the same for both. Doesn't really bother after I thought about it... there is a 4 lbs difference between 340mm and 370mm too (less rotational mass and unsprung weight). I bet you'd get better performance just by upgrading your brake pads on your current brakes with 340mm rotors.

For daily driving, you probably won't see too much of a performance difference between most brake systems.

The 370mm rotors will have a greater heat capacity which will help on the track.

[DrifterX]

Originally Posted by Polo08816

For daily driving, you probably won't see too much of a performance difference between most brake systems.

The 370mm rotors will have a greater heat capacity which will help on the track.

Agreed. And when you feel like having some fun here n there

[Vitoco]

Originally Posted by DrifterX

This is true for the USA/Candian market but isn't true for the European market, the 328i/428i get 370mm there

This. I have the 370 mm rotors on my 328i.

[Bee Pee]

Originally Posted by DrifterX

Edit: Side note, the M235i still gets 340mm front rotors even though it's got the 6 pot N55. Vehicle weight matters too.

I know, I have m135i here in the UK which come blue m sport calipers and rotors F 340mn and R 345mm. More than man enough for the job.