Z435is rotors, F30 backing plates, StopTech pads

Jeffman · 05-05-2015, 10:41 PM

F30 backing plates don't fit on the Xi's wheel hubs.

rwalker · 05-05-2015, 11:00 PM

do tell... I had to drill new holes, but the plates cleared just fine once I'd done so; what exactly was the issue?

realoem.com shows different part numbers for 335i vs 335xi, but the pictures do not illustrate how the plates are different; we're counting on you to show how these fail to fit:

#5 in each:
http://www.realoem.com/bmw/enUS/show...diagId=34_2287
http://www.realoem.com/bmw/enUS/show...diagId=34_2287

the backing plates for the F30 335i and 335Xi are the same part, so no hope for a reprieve there

Jeffman · 05-07-2015, 08:30 PM

My tech said he tried and tried and couldn't make them fit with out substantially bending them. I trusted him so told him to fageddaboutit

rwalker · 05-07-2015, 08:41 PM

is too bad, sorry

taibanl · 08-13-2017, 07:59 PM

Quote:

Originally Posted by Smooth 330i

Mfg Part# 34116782593KT

http://www.ecstuning.com/BMW-E92-335...ors/ES2526447/

Whats the significance of the KT at the end of the part number. Ecs and turner have it listed like that but dealers knly have the root part number (cheaper)

rwalker · 08-13-2017, 09:14 PM

You guys should take note that the parts I used originally have been superseded by a parts without the big scoop. The original part numbers (34116792237 and 34116792238) don't seem to be available anymore.

Mavus · 08-14-2017, 09:30 AM

Quote:

Originally Posted by taibanl

Quote:

Originally Posted by Smooth 330i

Mfg Part# 34116782593KT

http://www.ecstuning.com/BMW-E92-335...ors/ES2526447/

Whats the significance of the KT at the end of the part number. Ecs and turner have it listed like that but dealers knly have the root part number (cheaper)

believe it is just for kit that includes both rotors and hats

kegwalker · 06-04-2019, 11:56 AM

Old thread, but is it confirmed that the lighter 2 piece rotors fit all e9x 335's as an upgraded replacement?

Emilime75 · 06-04-2019, 01:46 PM

Quote:

Originally Posted by rwalker

You guys should take note that the parts I used originally have been superseded by a parts without the big scoop. The original part numbers (34116792237 and 34116792238) don't seem to be available anymore.

A quick search shows that FCP has them in stock and the photo looks right.

LMB335IS · 06-04-2019, 07:49 PM

Quote:

Originally Posted by kegwalker

Old thread, but is it confirmed that the lighter 2 piece rotors fit all e9x 335's as an upgraded replacement?

They fit, I had them back in the day. Yes you'll save a lb or two, not much, but really the advantage is that the aluminum hats don't rust and don't look like shit behind the wheels.

Aus335iguy · 06-05-2019, 04:37 AM

Quote:

Originally Posted by LMB335IS

Quote:

Originally Posted by kegwalker

Old thread, but is it confirmed that the lighter 2 piece rotors fit all e9x 335's as an upgraded replacement?

They fit, I had them back in the day. Yes you'll save a lb or two, not much, but really the advantage is that the aluminum hats don't rust and don't look like shit behind the wheels.

And the discs dont warp radially as a result.

renizer · 06-18-2019, 10:14 AM

Aus335iguy just curious, not sure I got you there - you're saying they warp radially otherwise because......?

Aus335iguy · 06-18-2019, 02:07 PM

Quote:

Originally Posted by renizer

Aus335iguy just curious, not sure I got you there - you're saying they warp radially otherwise because......?

There's no room for them to expand with the heat in the radial plane. Think of it like a washer(the kind you put under a bolt)
If the hole in the centre became bigger how would that affect the surface? It bows and warps it be a cause it has no where to go. That's why we use semi and fully floating discs. Not the only reason but one of many.

That's my understanding of it. Someone with a better understanding may correct it if I'm wrong.

renizer · 06-19-2019, 06:41 AM

If I got you right you're saying the rotors are warping due to the fact that the hub expands and distorts the attached rotor surface
I might be wrong but I always thought the alum hat discs are better in terms of heat dissipation and that's what benefits the rotors and keeps warping in check?

Aus335iguy · 06-19-2019, 03:21 PM

Quote:

Originally Posted by renizer

If I got you right you're saying the rotors are warping due to the fact that the hub expands and distorts the attached rotor surface
I might be wrong but I always thought the alum hat discs are better in terms of heat dissipation and that's what benefits the rotors and keeps warping in check?

The rotor expands a lot more than the hub but otherwise yes. That's why racing stuff is all floating. The discs aren't directly attached to the hub at all.

renizer · 06-20-2019, 05:41 AM

That makes sense actually, thanks for pointing that out. Have never looked at it this way.

Aus335iguy · 06-20-2019, 07:24 AM

Quote:

Originally Posted by renizer

That makes sense actually, thanks for pointing that out. Have never looked at it this way.

Neither did i until someone took the time and explained it to me

renizer · 10-04-2020, 04:51 AM

Quote:

Originally Posted by Jeffman

This doesn't work on a 2008 335xi.

Ask me how I know.

Jeffman can you provide some details as to why they didnt fit for you please?

I know this is an old thread but thanks for the inspiration with those backing plates. I picked up some of these used early F30 335i plates yesterday as I'm gonna do my front brakes tomorrow and will look into mounting them as well for better cooling at the track.
I can't find any details for fitting them on the E9x XI but the F30 has the same ones on 335i and 335xi, so let's see what happens.
I got the exact same part number ones that rwalker got.

05-05-2015, 10:41 PM	#23
Jeffman Lieutenant 28 Rep 488 Posts Drives: 2008 335xi E90 Join Date: Jul 2010 Location: Somewhere in America iTrader: (1) Garage List 2008 335xi Sedan [0.00]	F30 backing plates don't fit on the Xi's wheel hubs.
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05-05-2015, 11:00 PM	#24
rwalker Major 330 Rep 1,084 Posts Drives: the wheels off Join Date: Nov 2006 Location: San Diego, CA iTrader: (1)	do tell... I had to drill new holes, but the plates cleared just fine once I'd done so; what exactly was the issue? realoem.com shows different part numbers for 335i vs 335xi, but the pictures do not illustrate how the plates are different; we're counting on you to show how these fail to fit: #5 in each: http://www.realoem.com/bmw/enUS/show...diagId=34_2287 http://www.realoem.com/bmw/enUS/show...diagId=34_2287 the backing plates for the F30 335i and 335Xi are the same part, so no hope for a reprieve there Last edited by rwalker; 05-05-2015 at 11:16 PM..
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05-07-2015, 08:30 PM	#25
Jeffman Lieutenant 28 Rep 488 Posts Drives: 2008 335xi E90 Join Date: Jul 2010 Location: Somewhere in America iTrader: (1) Garage List 2008 335xi Sedan [0.00]	My tech said he tried and tried and couldn't make them fit with out substantially bending them. I trusted him so told him to fageddaboutit __________________ MHD Self-Tuned Scaled FlexFuel Map \| M-Boost \| N20 Tmap \| Helix IC \| Fuel-It Stage 2 LPFP \| BMS DCI \| BMS Thermostat Delete \| CP-E Charge Pipe \| Tial-Q BOV \| Apex Arc-8 Hyper Silver \| Michelin PSS \| Cool Carbon Brake Pads R/T \| SS Brakelines \| ECS 2-Piece Rotors F/R \| xHP Stage 3 \| xDelete Sport \| KW-V1 Coilovers \| Turner Strut Brace \| Lux Angel Eyes \| CF Kidneys \| Scoops
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05-07-2015, 08:41 PM	#26
rwalker Major 330 Rep 1,084 Posts Drives: the wheels off Join Date: Nov 2006 Location: San Diego, CA iTrader: (1)	is too bad, sorry
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08-13-2017, 09:14 PM	#28
rwalker Major 330 Rep 1,084 Posts Drives: the wheels off Join Date: Nov 2006 Location: San Diego, CA iTrader: (1)	You guys should take note that the parts I used originally have been superseded by a parts without the big scoop. The original part numbers (34116792237 and 34116792238) don't seem to be available anymore. __________________ rwalker@rwalker.com (I really dislike Private Messaging)
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06-04-2019, 11:56 AM	#30
kegwalker Private 5 Rep 63 Posts Drives: 2011 e90 335ix (n55) 6mt Join Date: May 2019 Location: Breckenridge, CO iTrader: (0)	Old thread, but is it confirmed that the lighter 2 piece rotors fit all e9x 335's as an upgraded replacement?
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06-18-2019, 10:14 AM	#34
renizer Private 12 Rep 86 Posts Drives: '10 E91 335xi N55 MT6 Join Date: Apr 2018 Location: Austria iTrader: (0)	Aus335iguy just curious, not sure I got you there - you're saying they warp radially otherwise because......?
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06-19-2019, 06:41 AM	#36
renizer Private 12 Rep 86 Posts Drives: '10 E91 335xi N55 MT6 Join Date: Apr 2018 Location: Austria iTrader: (0)	If I got you right you're saying the rotors are warping due to the fact that the hub expands and distorts the attached rotor surface I might be wrong but I always thought the alum hat discs are better in terms of heat dissipation and that's what benefits the rotors and keeps warping in check?
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06-20-2019, 05:41 AM	#38
renizer Private 12 Rep 86 Posts Drives: '10 E91 335xi N55 MT6 Join Date: Apr 2018 Location: Austria iTrader: (0)	That makes sense actually, thanks for pointing that out. Have never looked at it this way.
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