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M2 Technical Topics > Suspension | Brakes | Chassis > BMW M3/M4 F8X Carbon Fiber Strut Mod on the BMW M2

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      07-28-2019, 02:18 PM   #111
PilotxERAU
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Quote:
Originally Posted by 3t3p View Post
Thanks M Fifty.

From reading around I thought single use bolts were used in critical parts that are highly loaded like a cylinder head. Not a brace which will largely be sheer forces and some tension well within limits of the bolts themselves.

Good to know the snapped part isn't critical too!
That’s mostly for liability issues. So they don’t get sued if someone said “well you never said to replace any bolts”. It can never hurt but is it really necessary, no. I have reused all the screws I have driven for many thousand miles without any issue for what it’s worth.

Last edited by PilotxERAU; 07-29-2019 at 09:55 AM..
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      07-28-2019, 04:42 PM   #112
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As I said, if it doesn't require twisting another quarter or half turn, I'm happy to use it again.

Last edited by M Fifty; 10-18-2019 at 06:58 AM.. Reason: spelling
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      07-29-2019, 05:04 AM   #113
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Quote:
Originally Posted by 3t3p View Post
Thanks M Fifty.

From reading around I thought single use bolts were used in critical parts that are highly loaded like a cylinder head. Not a brace which will largely be sheer forces and some tension well within limits of the bolts themselves.

Good to know the snapped part isn't critical too!
The middle row of bolts look like 10 off M8 bolts part # 31306869931 that secure top mounts to the body strut towers.

Yr call whether or not to replace or not.
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      08-27-2019, 11:38 AM   #114
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Quote:
Originally Posted by M Fifty View Post
The battery strap was a little worrying - a 45 degree bend can be put in the tab to help clearance.

The M2C shares the brake servo hoses with the M3/4, which was something else I had wondered about getting, but I've not seen how they fit.

https://www.realoem.com/bmw/enUS/sho...diagId=34_2206
I got the chance to take some pictures under the bonnet of an M2C earlier, and it has a different ABS mounting bracket that gives much more clearance. The lead to the jump start point also appears to be a different design.
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      08-31-2019, 12:06 PM   #115
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Eventuri v2 plus carbon brace.

For those wondering the Eventuri v2 will work with carbon brace. The only mod needed is turning the rubber grommet upside down that holds the filter housing in place. This gives it just enough downward play to have the carbon brace resting on top. A little doubled sided sticky tape with microfiber cloth stuck to it will prevent any rubbing between top of carbon tube and bottom of carbon brace.
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      09-05-2019, 03:58 PM   #116
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Quote:
Originally Posted by Bee Pee View Post
If adding ohlins and then intending to retrofit m4 alloy brace part in the future - you will need to buy camber plates that can accommodate both OG m2 brace - single bolt fixing - and m4 brace - 3 bolt fixings.

This might limit yr choice of camber plate. IIRC Ground Control M2 CP's are compatible for both OGM2 and M2Comp.
I wanted to circle back around to this in case it may help anyone else out. Bee Pee is correct (++) in that the Ground Control camber plates are compatible with both M2 and M2 Comp, however there is a small caveat. To function with the Comp carbon brace, there is additional hardware required and the pin for the OG M2's brace must be pressed out. Ground Control are very helpful in this regard and sell the hardware separately/not installed.

An aside, the M2 GC camber plates are now offered in a very nice blue.
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      09-05-2019, 05:04 PM   #117
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Quote:
Originally Posted by M1500Z View Post
Quote:
Originally Posted by Bee Pee View Post
If adding ohlins and then intending to retrofit m4 alloy brace part in the future - you will need to buy camber plates that can accommodate both OG m2 brace - single bolt fixing - and m4 brace - 3 bolt fixings.

This might limit yr choice of camber plate. IIRC Ground Control M2 CP's are compatible for both OGM2 and M2Comp.
I wanted to circle back around to this in case it may help anyone else out. Bee Pee is correct (++) in that the Ground Control camber plates are compatible with both M2 and M2 Comp, however there is a small caveat. To function with the Comp carbon brace, there is additional hardware required and the pin for the OG M2's brace must be pressed out. Ground Control are very helpful in this regard and sell the hardware separately/not installed.

An aside, the M2 GC camber plates are now offered in a very nice blue.
Nitron top mounts are similar to GC ie x compatible between OGm2 and M2Comp & all other 5 bolt F8x
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      11-25-2019, 06:47 PM   #118
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Is there any difference between 31127855855 and 31127855856? One for LHD and other for RHD?
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      11-26-2019, 01:01 PM   #119
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It appears that they are both listed for LHD and RHD European models, with 31127855855 being used on US models as well.
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      12-02-2019, 04:50 PM   #120
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need some clarifying:

should the sheet metal corner braces in the OG be kept if one is to fit the carbon brace?

I saw some members with both and some with only the carbon brace\\\

can anyone chime in? maybe too stiffening with both?
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      12-04-2019, 01:26 PM   #121
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Quote:
Originally Posted by maliderosF87 View Post
need some clarifying:

should the sheet metal corner braces in the OG be kept if one is to fit the carbon brace?

I saw some members with both and some with only the carbon brace\\\

can anyone chime in? maybe too stiffening with both?
If you mount CF brace over the oem pressed steel corner braces, at the front shared bolt fixing the underside of the CF brace is not sitting down tight on a flat surface as intended.

IMHO this effectively limits CF brace structural contribution so either remove corner braces when fitting the brace or modify them locally at the shared fixing location so as CF brace can be tightened/clamped to flat surface.
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      12-04-2019, 02:46 PM   #122
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It may also lead to the CF brace touching the underside of the bonnet as a result of sitting that bit higher...
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      01-06-2020, 07:30 PM   #123
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Do you happen to have the part numbers for the "rubber covers that go over the strut tops." ? The M2C and M2 share the same part number and we have these but no way these work for us. These are pretty much the only parts we need so any help is greatly appreciated.

Quote:
Originally Posted by M Fifty View Post
I bought
M2C Cowl Panel Cover - 51 71 8 073 546
M2C Engine Hood Seals (fits by the bonnet hinges) - 51 76 8 073 533 &534
M3/4/2C Covers - 51 71 8 059 699 and 64 31 8 059 697
plus the rubber covers that go over the strut tops.

The M3/4 bits were used, but the rest were new.

The M2C Cowl panel cover fits at the base of the windscreen and allows you to use the M3/4 Covers.
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      01-07-2020, 06:20 PM   #124
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Quote:
Originally Posted by ///Monika View Post
Do you happen to have the part numbers for the "rubber covers that go over the strut tops." ? The M2C and M2 share the same part number and we have these but no way these work for us. These are pretty much the only parts we need so any help is greatly appreciated.

Quote:
Originally Posted by M Fifty View Post
I bought
M2C Cowl Panel Cover - 51 71 8 073 546
M2C Engine Hood Seals (fits by the bonnet hinges) - 51 76 8 073 533 &534
M3/4/2C Covers - 51 71 8 059 699 and 64 31 8 059 697
plus the rubber covers that go over the strut tops.

The M3/4 bits were used, but the rest were new.

The M2C Cowl panel cover fits at the base of the windscreen and allows you to use the M3/4 Covers.
https://www.realoem.com/bmw/enUS/sho...diagId=41_2176

Item # 3 on the attached
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      01-08-2020, 03:15 PM   #125
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Yeah, odd as these were the stock parts we took off our car and RealOEM shows it's compatible across both the M2 and M2C. Is that right ? We can't seem to fit these on...

Code:
03	Left engine hood sealing		1			51767307863			
03	Right engine hood sealing		1			51767307864
Quote:
Originally Posted by Bee Pee View Post
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      01-08-2020, 04:06 PM   #126
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Quote:
Originally Posted by ///Monika View Post
Yeah, odd as these were the stock parts we took off our car and RealOEM shows it's compatible across both the M2 and M2C. Is that right ? We can't seem to fit these on...

Code:
03	Left engine hood sealing		1			51767307863			
03	Right engine hood sealing		1			51767307864
Quote:
Originally Posted by Bee Pee View Post
Sorry - bum steer - checked my parts list I used item # 3 from same realoem for F8x m3/4 parts


https://www.realoem.com/bmw/enUS/sho...diagId=41_2197
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Last edited by Bee Pee; 01-09-2020 at 03:49 AM..
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      01-08-2020, 04:10 PM   #127
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Greatness, thank you so much ...

Quote:
Originally Posted by Bee Pee View Post
Sorry - bump steer - checked my parts list I used item # 3 from same realoem for F8x m3/4 parts


https://www.realoem.com/bmw/enUS/sho...diagId=41_2197
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      01-08-2020, 07:05 PM   #128
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So it's a dead cert that original front bracing has to come out to let the carbon bolt onto the landing plate?

Incidentally I haven't seen anyone mention what bolts are used to attach the carbon brace to the landing plate, or are people reusing the ones from stock braces?

Getting my parts fitted on 27th this month!

My garage are going to cut the stock plastic parts so I'm not buying and cowl or hinge seal or internal covers, saves enough money to get the latest i-step software.
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      01-09-2020, 03:55 AM   #129
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Quote:
Originally Posted by 3t3p View Post
So it's a dead cert that original front bracing has to come out to let the carbon bolt onto the landing plate?

Incidentally I haven't seen anyone mention what bolts are used to attach the carbon brace to the landing plate, or are people reusing the ones from stock braces?

Getting my parts fitted on 27th this month!

My garage are going to cut the stock plastic parts so I'm not buying and cowl or hinge seal or internal covers, saves enough money to get the latest i-step software.
People have installed CFRP brace over the top of oem corner braces.

I'm choosing not to do this wo 1st modfiying the oem braces for the reason I've stated earlier in this thread.

I've bought a 2nd used set of corner braces as I plan to remove any profile - to create an even surface - where the CFRP brace will b e clamped by the bolt on top of the corner braces.

Original 2 bolts can be re-used up front as IIRC they are the same part no for M2 and M2C etc.
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      01-09-2020, 02:21 PM   #130
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Ah when I read that the CF brace would not be flat I thought you meant in reference to its rearward mounting point on the aluminium brace and it being bent downward in an arc.

I'll see what Darren Wood make of it!
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      01-22-2020, 11:42 AM   #131
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Would love to know if the TMS CF "boomerang braces" fit with oem CFRP retrofitted to OG M2....

https://www.turnermotorsport.com/p-5...corner-braces/

Need to wait until March until these are available...
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      01-22-2020, 12:25 PM   #132
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Quote:
Originally Posted by Bee Pee View Post
Would love to know if the TMS CF "boomerang braces" fit with oem CFRP retrofitted to OG M2....

https://www.turnermotorsport.com/p-5...corner-braces/

Need to wait until March until these are available...
Not sure why you'd need both braces. But doesn't seem like it'd, since they both use the same front mounting holes. Looks like that combo would be too thick to close the hood.

Good find though. These are cheaper, lighter, and stiffer than the RPK braces. And retain easy access to the air filter, unlike the BMW carbon brace.

But unsure which is stiffer or stiff enough between the BMW brace and that one.
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