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Old 04-04-2013, 02:30 AM   #1
jdehaan
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Default M coupe Rear Subframe Swap

I have an S52 in my TI and a ground control suspension. I need to replace the Rear Subframe bushings and have heard that swapping out the TI subframe for an M Coupe/Roadster is a good idea since it's stronger. I have a couple questions before I go forward with it.

1. What do I need to look for? I've seen posts for people parting out M coupes, but would I just ask to buy the rear subframe? Are there any other parts needed from the M coupe?

2. Will I need to replace the rear suspension I currently have on the car? What about the rear brakes?

Thanks!
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Old 04-04-2013, 03:18 AM   #2
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Get the complete rear.
Subframe/trailing arms/differential
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Old 04-06-2013, 06:43 PM   #3
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Quote:
Originally Posted by 318_mzk2 View Post
Get the complete rear.
Subframe/trailing arms/differential
Thanks!
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Old 04-07-2013, 02:03 AM   #4
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The subframe itself isnt stronger, its the same part. The arms have a later beam thats reinforced, larger wheel bearings, and larger brakes that are also vented. The differential is limited-slip with a cooling louvered cover. The rear sway is also thicker in comparison to all ti spec bars. The rear coils are very nice and lower the car to H&R race spec and the shocks are a very nice compliment to the ti.
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Old 04-14-2013, 04:26 PM   #5
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I put an M Roadster and 318ti subframe next to one another and examined the differences.

The mounts for the trailing arms are gusseted a little more on the M roadster.

Also, if you look through the hole in the center (bottom side) of the subframe, the M roadster has an extra reinforcement bar (think "c" channel) inside it for added strength.

I was going to sell my M roadster subframe until I saw that it is in fact beefier.

Instead, I strip the roadster frame and por15'd it. Going in sometime this or next week with the rest of the M roadster goodies!

Also worth noting, you have to use your brake lines from the ti and mount them to the M trailing arms.
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