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      09-07-2023, 01:34 PM   #1
Needsdecaf
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More nitty-gritty details on the M4 CSL Suspension

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I had posted about Suspension Secrets in the UK in the context of Joe Achilles having his RWD G80 aligned there in the past, and just re-watched that video. In the video, Joe mentions their blog. The latest article is on the M4 CSL intricacies including the difference to the normal M4

https://suspensionsecrets.co.uk/2022...sion-overview/

Few interesting tidbits:

"The front axle was much the same as the standard G82-generation M4, save for a more aggressive front camber setting. This camber increase is built in to wheel hubs that are unique to the M4 CSL."
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      09-10-2023, 09:43 AM   #2
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Well we already knew all that and a bit lame they are not talking about the different part numbers like the actual shocks, springs, sway bars. I got my CSL on the lift back in November and it's when I noticed the car didn't have helper springs like BMW was talking about in there presentations.

It's more a little marketing article for that particular shop than anything useful.

Here are some pics I took back then and posted in CSL owners thread.
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Last edited by PLF69; 09-10-2023 at 09:51 AM..
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      09-10-2023, 10:51 AM   #3
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Sorry I was trying to be helpful.
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      09-10-2023, 10:53 AM   #4
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Helper springs donít affect performance. They are meant to make sure the spring doesnít come unseated and rattle around when the wheels go to full droop. Itís purely a function of the spring rate, length, check load, and internal stress. If the spring load is less than some minimum value at full droop, they will add a helper spring to keep it above that value.

Itís likely that BMW defined a range of spring rates they wanted to try early in the program and some of them were under the threshold, so they designed in helper springs. Then when they finished developing the car, they chose a spring that didnít need a helper to stay seated.

Zero affect to performance.
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      09-10-2023, 11:07 AM   #5
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Quote:
Originally Posted by Racer20 View Post
Helper springs donít affect performance. They are meant to make sure the spring doesnít come unseated and rattle around when the wheels go to full droop. Itís purely a function of the spring rate, bright, check load, and internal stress. If the spring load is less than some minimum value at full droop, they will add a helper spring to keep it above that value.

Itís likely that BMW defined a range of spring rates they wanted to try early in the program and some of them were under the threshold, so they designed in helper springs. Then when they finished developing the car, they chose a spring that didnít need a helper to stay seated.

Zero affect to performance.
Yup
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      09-10-2023, 11:09 AM   #6
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Quote:
Originally Posted by Needsdecaf View Post
Sorry I was trying to be helpful.
Not against you or anything, I guess if something sounds new or special it's a good sell to put it on the front page to get more traffic, we sometimes forget this forum is a business.
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      09-10-2023, 11:25 AM   #7
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Quote:
Originally Posted by PLF69 View Post
Not against you or anything, I guess if something sounds new or special it's a good sell to put it on the front page to get more traffic, we sometimes forget this forum is a business.
I donít think Needsdecaf sells anything though.
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      09-10-2023, 11:28 AM   #8
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Quote:
Originally Posted by kgelfen360 View Post
I donít think Needsdecaf sells anything though.
I don't think he put it on the front page himself either, unless he is a moderator or something.
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      09-10-2023, 11:29 AM   #9
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Quote:
Originally Posted by PLF69 View Post
I don't think he put it on the front page himself either, unless he is a moderator or something.
Nope. Not me. Was neat to see details I was previously u aware of.
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      09-10-2023, 12:24 PM   #10
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Thread that starts off weird, and then quickly becomes worth a million likes.

Strong work, forum

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      09-10-2023, 01:03 PM   #11
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AST suspension, Michelins, Monoballs, CS flash - thank me later!
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      09-10-2023, 03:15 PM   #12
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Quote:
Originally Posted by PLF69 View Post
Well we already knew all that and a bit lame they are not talking about the different part numbers like the actual shocks, springs, sway bars. I got my CSL on the lift back in November and it's when I noticed the car didn't have helper springs like BMW was talking about in there presentations.

It's more a little marketing article for that particular shop than anything useful.

Here are some pics I took back then and posted in CSL owners thread.
It does have the helper springs. It's in one of your photos.
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      09-10-2023, 03:22 PM   #13
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Quote:
Originally Posted by Boogie2121 View Post
AST suspension, Michelins, Monoballs, CS flash - thank me later!
Lol. Iím not as privy to the CSL technical details as you guys but sounds about right. As an F80 CS owner (I paid $10k under MSRP) the approximate $16k I paid over an F80 comp was worth it. When I added up the special factory parts (including $5,500 carbon hood) special light weight wheels, unique interior and seats , CS tuning, rarity value, etc. it seemed fair. We donít know how many got their CSLís at MSRP but Iím certain some paid over. BMW sure is proud of their CS/CSL models. Discovering/learning more about parts unique to those models does help ease the premium price pain tho.
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      09-10-2023, 03:29 PM   #14
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Quote:
Originally Posted by HP Autosport View Post
It does have the helper springs. It's in one of your photos.
It's just a rubber isolator/absorber on the coil.
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      09-10-2023, 05:09 PM   #15
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Quote:
Originally Posted by HP Autosport View Post
It does have the helper springs. It's in one of your photos.
I could be wrong but all Iím seeing is a progressive spring 🤷‍♂️
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      09-10-2023, 07:19 PM   #16
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Quote:
Originally Posted by tfunk88 View Post
I could be wrong but all Iím seeing is a progressive spring 🤷‍♂️
I see what you see.
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      09-10-2023, 11:24 PM   #17
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Aggressive camber is pretty much the first mod for any track minded G8X no surprise there. I wonder what the actual spring rates are and what camber they ship at? Still not adjustable though?
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      09-11-2023, 12:15 AM   #18
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Not adjustable, fixed by a different hub assembly.
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      09-11-2023, 05:26 AM   #19
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Quote:
Originally Posted by Matt@Evolve View Post
Not adjustable, fixed by a different hub assembly.
Matt - is the intent to retrofit the m3 CS hub carriers / swivels to add camber to Evolveís M3T CSL ??
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      09-11-2023, 07:10 AM   #20
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a csl without clubsport suspension, really is just an upbadged m4 for the masses. either way it doesnt matter, the folks buying it after the market adjustments arent taking it to the track either way.
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      09-11-2023, 08:50 AM   #21
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Quote:
Originally Posted by jmg View Post
Aggressive camber is pretty much the first mod for any track minded G8X no surprise there. I wonder what the actual spring rates are and what camber they ship at? Still not adjustable though?

My guess from eyeing it is around -2.5, felit like it too.

Unfortunately I did not keep my CSL but I would of out it on a an alignment rack eventually.
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      09-12-2023, 03:31 AM   #22
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A standard F80 or G80 with camber plates (-2.5 street, -4.0 to -5.0 track day settings) and monoball), along with a more aggressive Toe Out, track bushings, and sub 110 compound tires will beat any CS or CSL at a fraction of the cost. With no fancy suspension upgrades. People rush to hand over money, without understanding the importance of GEOMETRY.
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