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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > M3 vs Non-M Front Subframe



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      05-21-2019, 06:57 PM   #1
Justin Daniels
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M3 vs Non-M Front Subframe

I have found lots of information on the REAR subframe differences, but nothing on the front. Are the suspension mount points all in the same position and the only differences clearly visible (bar under engine, integrated bracing to right behind the front wheels)?

I have an entire M3 worth of subframes/arms/diff/axles/uprights/coilovers going under my 325i and it turns out the M3 subframe is tweaked a bit, so I'll just run the 325i unit if it's dimensionally the same.

Thanks in advance

Cheers,
Justin
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      05-25-2019, 10:40 AM   #2
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Chassis mounts yes. Suspension mounts yes. Engine mounts no. So no use unless installing a v8 in your car.
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      05-26-2019, 09:22 PM   #3
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Quote:
Originally Posted by feuer View Post
Chassis mounts yes. Suspension mounts yes. Engine mounts no. So no use unless installing a v8 in your car.
That's what it looked like when I laid one atop the other, but wanted to confirm.
I am installing a V8 but not the M3 lump. I'd rather keep the N52/54 subframe in case I ever want to make the car CCA legal.

Thanks.
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      12-24-2019, 09:03 AM   #4
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hi,


do you know if i could use a 2009 318i petrol front subframe on my 2007 E90 335d?


thanks
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      12-24-2019, 09:46 AM   #5
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Quote:
Originally Posted by grafton View Post
hi,


do you know if i could use a 2009 318i petrol front subframe on my 2007 E90 335d?


thanks
Use www.realoem.com to compare
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      12-24-2019, 10:09 AM   #6
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looks like the same front subframe for all e90 models except the V8 M3 model
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      12-24-2019, 02:56 PM   #7
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Quote:
Originally Posted by feuer View Post
Chassis mounts yes. Suspension mounts yes. Engine mounts no. So no use unless installing a v8 in your car.
That's a good point. Never thought about engine mounting.

You would want a 1M subframe. Has anyone actually confirmed that the pickup points are all exactly the same? OP can you verify that?
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      12-24-2019, 07:46 PM   #8
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Quote:
Originally Posted by bbnks2 View Post
That's a good point. Never thought about engine mounting.

You would want a 1M subframe. Has anyone actually confirmed that the pickup points are all exactly the same? OP can you verify that?
Why front 1M subframe? Is shared with all non M RWD models.
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      12-27-2019, 10:44 PM   #9
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Quote:
Originally Posted by feuer View Post
Why front 1M subframe? Is shared with all non M RWD models.
Yepp 31116785639

So you can say that there is no " M car upgrade" available. 1M uses the same subframe as every other 1 series.
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      12-28-2019, 07:14 PM   #10
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Quote:
Originally Posted by bbnks2 View Post
Yepp 31116785639

So you can say that there is no " M car upgrade" available. 1M uses the same subframe as every other 1 series.
The front yes, the rear is 100% m3 subframe
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      12-31-2019, 05:39 PM   #11
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The "upgrade" is the solid panel that reinforces the subframe:




It won't fit non-M subframes but I replicated it by using the same mounting points for my own bracing. It reinforces the tension strut and wishbone mounts. It was more of an experiment but I couldn't believe the difference it made. Biggest surprise was the reduction in NVH gained from the M3 arms. The factory underbody panel still fits too.


Last edited by Guy Fieri; 02-12-2020 at 12:25 AM..
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      12-31-2019, 09:20 PM   #12
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Quote:
Originally Posted by freedomfries View Post
The "upgrade" is the solid panel that reinforces the subframe:



It won't fit non-M subframes but I replicated it by using the same mounting points for my own bracing. It reinforces the tension strut and wishbone mounts. It was more of an experiment but I couldn't believe the difference it made. Biggest surprise was the reduction in NVH gained from the M3 arms.

Very interresting! specially for the NVH reduction feedback.

The OEM answer could be the V brace from E88, no?

https://www.1addicts.com/forums/show...751&page=2
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      01-01-2020, 12:33 AM   #13
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I believe the rear most mounting point interferes with the existing brace, and the undertray likely won't fit with the front bracket installed
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      01-01-2020, 02:29 AM   #14
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Quote:
Originally Posted by freedomfries View Post
I believe the rear most mounting point interferes with the existing brace, and the undertray likely won't fit with the front bracket installed
https://www.realoem.com/bmw/enUS/sho...diagId=51_7043

there is a specific underhood for the E88
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      01-09-2020, 10:26 PM   #15
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Quote:
Originally Posted by freedomfries View Post
The "upgrade" is the solid panel that reinforces the subframe:



It won't fit non-M subframes but I replicated it by using the same mounting points for my own bracing. It reinforces the tension strut and wishbone mounts. It was more of an experiment but I couldn't believe the difference it made. Biggest surprise was the reduction in NVH gained from the M3 arms.

Awesome! Just curious but what keeps the M3 panel from fitting? The exhaust?
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      01-10-2020, 11:32 PM   #16
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The stock black bracing interferes with the rear mounting points of the M3 plate. The stock brace cannot be removed because it connects the non-M subframe to the chassis. The M3 subframe is directly mounted to the chassis.
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      01-12-2020, 04:51 PM   #17
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Quote:
Originally Posted by freedomfries View Post
The stock black bracing interferes with the rear mounting points of the M3 plate. The stock brace cannot be removed because it connects the non-M subframe to the chassis. The M3 subframe is directly mounted to the chassis.
Gotcha. Are the inserts already there for the M3 brace or did you insert your own? Or nut/bolt it?
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      01-13-2020, 12:21 AM   #18
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Quote:
Originally Posted by tlow98 View Post
Gotcha. Are the inserts already there for the M3 brace or did you insert your own? Or nut/bolt it?
You need four rivnuts (07147199279) and M10 bolts



https://www.fcpeuro.com/products/bmw...ut-07147199279
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      01-25-2020, 06:25 AM   #19
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Quote:
Originally Posted by freedomfries View Post
It won't fit non-M subframes but I replicated it by using the same mounting points for my own bracing. It reinforces the tension strut and wishbone mounts. It was more of an experiment but I couldn't believe the difference it made.
Great info .-) Does the engine splash guard fits afterwards or did you have to make any changes iot to fit?
Thx
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      01-25-2020, 01:24 PM   #20
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Quote:
Originally Posted by streetpro View Post
Great info .-) Does the engine splash guard fits afterwards or did you have to make any changes iot to fit?
Thx
Factory underpanel fits perfectly, but it will depend on the thickness of the metal stock used. My brace is about 3/8" thick
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      07-22-2020, 11:34 AM   #21
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Quote:
Originally Posted by freedomfries View Post
The stock black bracing interferes with the rear mounting points of the M3 plate. The stock brace cannot be removed because it connects the non-M subframe to the chassis. The M3 subframe is directly mounted to the chassis.

Do you know why 1 series E82 don'h have this V black bracing?

My idea is that maybe we (1 serie owners) could fit the thorough M3 Reinforcment plate (without cut). It would be great

Thanks
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      07-22-2020, 11:43 AM   #22
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Quote:
Originally Posted by freedomfries View Post
You need four rivnuts (07147199279) and M10 bolts



https://www.fcpeuro.com/products/bmw...ut-07147199279

For information the brand of this Nut is Bolhoff RIVKLE HRT

You can buy it for cheaper than at BMW.

https://eshop.boellhoff.de/en/Riveti...ce-Thread.html
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