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M3 Track: Racing and DE Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start!


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Old Fri, Dec-13-2019, 08:37:04 PM   #1
F1Dryvr
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Default Subframe...

For track only. Short of full subframe integrated cage.

Whats everyone done/planning to do for subframes. Plates are done on mine and i check routinely for new cracks and so far no evidence of any. Id like to get it more secure this winter and definitely doing the foam. Also considering the cmp bars. Not the racebrace.

I searched the track forum and its not really discussed.
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Old Fri, Dec-13-2019, 08:55:07 PM   #2
eacmen
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Default Re: Subframe...

You’re going to get varying opinions. Personally I did plates with the Mason X Brace and felt that was enough.
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Old Fri, Dec-13-2019, 09:20:15 PM   #3
F1Dryvr
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Default Re: Subframe...

I figured but thats what i wanted. Too see how many people went further than plates and how much further.
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Old Fri, Dec-13-2019, 09:46:05 PM   #4
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Default Re: Subframe...

That's probably enough for weekend street car, but for a racecar, I'd want to, if not a cage, have some custom 6 point scaffolding or bracing done to connect 4 subframe mount pounts and shock towers. Plates if there are existing cracks, othereise I'd skip and do all "topside" work. Not ideal to lower the subframe, though CMP has special solid bushes to correct it.
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Old Fri, Dec-13-2019, 10:04:08 PM   #5
JerseyDriver820
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Default Re: Subframe...

I went for the full CMP solution during a group buy. It's overkill for a weekend track car but as the car continues to age, I'm sure I won't be disappointed that I chose an over engineered solution.

Do it right once, and move on. That's the theory at least lol

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Old Fri, Dec-13-2019, 10:56:46 PM   #6
SQ13
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Default Re: Subframe...

Probably the Vince bar bc it doesn't stick out like the CMP bar.
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Old Sat, Dec-14-2019, 03:31:49 AM   #7
lmtfi
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Default Re: Subframe...

I had plates done. My shop found a hairline on an RTAB pocket - so those got done as well.
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Old Sat, Dec-14-2019, 05:15:16 AM   #8
eacmen
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Default Re: Subframe...

Quote:
Originally Posted by lmtfi View Post
I had plates done. My shop found a hairline on an RTAB pocket - so those got done as well.


Was there a specific product you used to reinforce the RTAB pocket? Or did your shop just fab something up?
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Old Sat, Dec-14-2019, 01:04:44 PM   #9
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Default Re: Subframe...

Quote:
Originally Posted by eacmen View Post
Was there a specific product you used to reinforce the RTAB pocket? Or did your shop just fab something up?
Gargastic has a product, most people just reweld the seams I think

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Old Sat, Dec-14-2019, 03:19:28 PM   #10
Drewster
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Default Re: Subframe...

Plates and foam - been fine for over 5 years now
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Discussing Subframe... in the M3 Track: Racing and DE Forum - Best mod for speed is learning to get the most out of what you currently have. Tracks and DE's is the place to start! at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)