LMB 650 is coming alive

[JohnDaviz]

Mr little pinky is still embarrassed from the crash and was to shy to say hello

I will check for the parts. Looks fairly easy to install and seems to be only those two parts. Also where they bolt to seems to be a common part of all E9x series.

Oh and regarding the speedholes. When you are at the Nordschleife or i guess any track where M3s are racing. I swear 95% of them have it. 100% of the cars that were more serious built have it.

 

[JohnDaviz]

what i don´t get yet is how this part is installed.

 

[wheela]

what i don´t get yet is how this part is installed.

View attachment 107511

Is that this part?

 

[JohnDaviz]

yes

 

[CalvinNismo]

Tonight I went and crawled under the wife’s (giggity) E88. It’s a bolt on version of this welded triangle. If you’re doing a chunk of welding though, may as well?

This thread has a bit of information on it and then ventures off topic a bit.

e93 M3 Rear Subframe Brace

e93 M3 Rear Subframe Brace

www.e90post.com

 

[ShocknAwe]

Hm. E88 you say. Wonder how applicable it is to the E82, how much it weighs. And what the benefit is.

 

[CalvinNismo]

Hm. E88 you say. Wonder how applicable it is to the E82, how much it weighs. And what the benefit is.

Tying into the sills seems like a really good idea, though the convertibles all have reinforced sills.

This is how I picture it simplistically. If you think about a side on profile of a car going through a big compression, the front subframe will want to move up away from the sill and the rear subframe will want to do the same. Now on normal car with a roof, some of this will be under tension from the sills and tunnel area and compression up the A and C pillars to the roof frame. This is then exaggerated when there is no roof, so these bolt on bars in tension minimise the amount in front or behind the subframe can pull away from the sill. I’m sure there’s more to it than that, but hopefully I’ve explained my thinking decently.

Both of these videos are good to see how BMW M already do things.

Edit: Grammar.

 

[JohnDaviz]

Tonight I went and crawled under the wife’s (giggity) E88. It’s a bolt on version of this welded triangle. If you’re doing a chunk of welding though, may as well?



This thread has a bit of information on it and then ventures off topic a bit.

e93 M3 Rear Subframe Brace

e93 M3 Rear Subframe Brace

www.e90post.com

Hope she liked it

Thanks mate! That looks beefy!
And thanks for the link.

My plans are to remove the whole plastic thing from the trunk and close it with a flat panel. I need to check where that things bolt to.

 

[JohnDaviz]

Found the attachment points i was looking for:

 

[JohnDaviz]

Alright. For anyone wanting to do this. You need to weld two brackets (No 22 shown on second screenshot) to the chassis which should be fairly easy for someone who can weld (not me).

Number on Pic	Amount	PN		Screws	Amount	PN
No 1	1	51618045950		No 4	3	7147203503
No 1	1	51618045987		No 9	2	7119905818
No 8	1	51618045988		No 10	1	7147165618
No 22	2	41147167540

Above are the part numbers for, i hope, all parts needed shown in below screenshots

 

[jzx_andy]

Exciting stuff dude. I went down a similar route re quarters recently. Ditched the custom ones and went with factory metal. It isn't for the faint of heart but worth it on a car that you love!

 

[JohnDaviz]

Exciting stuff dude. I went down a similar route re quarters recently. Ditched the custom ones and went with factory metal. It isn't for the faint of heart but worth it on a car that you love!

Thanks mate! You speak from my heart. Going with factory metal is just the right thing to do imho.

 

[Hydra Performance]

If I may gents, the areas of highest return as far as increasing chassis torsional stiffness goes are

a) enclosing the front subframe with an E9x M3 aluminum bellypan, this will make a HUGE difference to chassis responsiveness

and

b) somehow closing off or stiffening the rear bulkhead area behind the rear seat backs. BMW quote a 25-30% difference in torsional rigidity between an E36/E46 with folding rear seats & one without (those cars come with a sheetmetal bulkhead separating the cabin from the trunk)

Those cabrio rear body braces are probably more for bending stiffness and likely won't yield huge returns compared to the above.

Now can anybody show me a foto of a naked fenderwell? I want to get a feel for how useful a fenderbrace would be for increasing chassis rigidity, as this is another high-reward area.

 

[CalvinNismo]

If I may gents, the areas of highest return as far as increasing chassis torsional stiffness goes are

a) enclosing the front subframe with an E9x M3 aluminum bellypan, this will make a HUGE difference to chassis responsiveness

and

b) somehow closing off or stiffening the rear bulkhead area behind the rear seat backs. BMW quote a 25-30% difference in torsional rigidity between an E36/E46 with folding rear seats & one without (those cars come with a sheetmetal bulkhead separating the cabin from the trunk)

View attachment 107587


Those cabrio rear body braces are probably more for bending stiffness and likely won't yield huge returns compared to the above.

Now can anybody show me a foto of a naked fenderwell? I want to get a feel for how useful a fenderbrace would be for increasing chassis rigidity, as this is another high-reward area.

A Slon wall is what you want, very nice piece, though expensive. Unfortunately not compatible with my E87 though. I have settled for a K-brace instead.

Slon Workshop E9X M3 / E82 1M Carbon Rear Strengthening Wall

A simple, affordable, and elegant way to significantly increase torsional rigidity of the chassis is to install a carbon fiber strengthening wall. This specially designed part for the E9X M3 coupe, sedan, and E82 1M is suitable for standard non-M models as well. This carbon fiber wall allows you...

ind-distribution.com

I agree about the M3 belly pan, JohnDaviz already runs the modified belly pan (as do I).

Edit: Link to post about naked wheel arches.

BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) - View Single Post - Pyrat Clone

Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums

www.bimmerpost.com

 

[Hydra Performance]

A Slon wall is what you want, very nice piece, though expensive. Unfortunately not compatible with my E87 though. I have settled for a K-brace instead.

Slon Workshop E9X M3 / E82 1M Carbon Rear Strengthening Wall

A simple, affordable, and elegant way to significantly increase torsional rigidity of the chassis is to install a carbon fiber strengthening wall. This specially designed part for the E9X M3 coupe, sedan, and E82 1M is suitable for standard non-M models as well. This carbon fiber wall allows you...

ind-distribution.com

I agree about the M3 belly pan, JohnDaviz already runs the modified belly pan (as do I).

Edit: Link to post about naked wheel arches.

BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) - View Single Post - Pyrat Clone

Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums

www.bimmerpost.com

I've seen that Slon bulkhead. And while it is indeed a very nice piece, its not worth 2k+ to me. I think I'm going to buy that E88 rear bulkhead brace for ~$80 & modify it with some strategically placed sheetmetal to achieve the desired effect.

Got any pictures of the naked FRONT fenderwells by any chance?

 

[CalvinNismo]

I've seen that Slon bulkhead. And while it is indeed a very nice piece, its not worth 2k+ to me. I think I'm going to buy that E88 rear bulkhead brace for ~$80 & modify it with some strategically placed sheetmetal to achieve the desired effect.

Got any pictures of the naked FRONT fenderwells by any chance?

Here are a couple, maybe John could get you some specific photos of his E92 if you need?

BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) - View Single Post - Pyrat Clone

Forum for BMW 1-Series 3-Series 5-Series 7-Series M3 M5 M6 Z4 X1 X3 X5 X6 Z2 Z4 325i 330i 335i 535i 550i 755i BMW Forums

www.bimmerpost.com

If you were to adapt and offer the E88/E93 rear bulkhead and it was bolt in, I’d be interested for sure.

 

[ShocknAwe]

I've seen that Slon bulkhead. And while it is indeed a very nice piece, its not worth 2k+ to me. I think I'm going to buy that E88 rear bulkhead brace for ~$80 & modify it with some strategically placed sheetmetal to achieve the desired effect.

Got any pictures of the naked FRONT fenderwells by any chance?

I'd be all over a metal reinforced bulkhead that was reasonably removable. My definition of reasonably removable would be some sort of large screw/bolt accessible without removing lining. Something like bike seat adjustment knobs. Hugely valuable vs the SLON piece that is made of crusted diamond.

 

[jzx_andy]

Yeah a bolt-in solution of some sort would be great. Even if it means cutting/drilling a few things and using rivnuts like you would with the m3 front plate.

 

[Hydra Performance]

Got one, won't fit whatsoever as there is no support structure to bolt it to. I'm working on reinforcing the V-brace underneath the car now instead, to hopefully add some more longitudinal + torsional rigidity to that general area...

 

[ShocknAwe]

Got one, won't fit whatsoever as there is no support structure to bolt it to. I'm working on reinforcing the V-brace underneath the car now instead, to hopefully add some more longitudinal + torsional rigidity to that general area...

Honestly that's better anyway, retains fold down seats for those of us that use them and keeps additional COG low.