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      10-01-2021, 08:34 PM   #1
StudioRSR
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///StudioRSR - Installing & Track Testing SPL Parts adjustable suspension - G8X M3/M4

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Studio RSR is glad to announce that the full lineup of SPL Parts adjustable suspension arms and linkages are now available for the G80 M3 and G82 M4 chassis.

For everyone, even those who've lowered their cars, the suspension geometries for roll center & pivot point are changed. The SPL Parts suspension components correct this change and provide the correct geometry and travel of your G8x suspension.

Checkout our install/test video and let us know if you have any questions!

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      10-04-2021, 04:20 PM   #2
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Good to see the mods and upgrades for this platform coming through now!
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      10-04-2021, 04:27 PM   #3
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Quote:
Originally Posted by SteveChester View Post
Good to see the mods and upgrades for this platform coming through now!
Agreed!
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      10-04-2021, 04:39 PM   #4
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StudioRSR, slightly off topic: do you offer the same parts for F36 series?
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      10-04-2021, 11:48 PM   #5
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Damn computers ruin everything

Realistically, would a normie like myself even feel the need to get something like this if I'm rolling a spring or HAS kit, or is this targeted for the track-folk?
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      10-05-2021, 12:33 AM   #6
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Quote:
Originally Posted by mattssi View Post
Damn computers ruin everything

Realistically, would a normie like myself even feel the need to get something like this if I'm rolling a spring or HAS kit, or is this targeted for the track-folk?
Only needed if you really really really want to dial in your alignment to pin point specifications.

Otherwise a few proven items like front mono balls, end links and toe links and the like will get you there without the crazy time needed to dial everything in.

The full SPL kit essentially replaces every suspension arm front and back and it will cost you a pretty penny if you do all of them. I priced them out and it's around $3.8k for just parts.
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      10-05-2021, 04:34 PM   #7
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Then there is setup time. I have the full SPL setup on my F80 and it takes some who really knows what they are doing to get it set up correctly. I still have some annoying bump steer in the rear and every shop in my area is slammed.
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      10-07-2021, 01:00 PM   #8
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I recently saw a video in which it mentioned an SPL front upper arm (thrust arm) snapping on track. Not sure of the full background, but would be interested to hear from anyone who has more details or experience with these arms.
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      10-11-2021, 02:55 PM   #9
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Quote:
Originally Posted by mattssi View Post
Damn computers ruin everything

Realistically, would a normie like myself even feel the need to get something like this if I'm rolling a spring or HAS kit, or is this targeted for the track-folk?
100%. In the least, even just with lowering springs or the HAS kit that you have, the pivot point of the tie-rods need to be corrected to prevent accentuated bumpsteer resulting from the lowered center. The tie-rod ends are the first thing we recommend when doing SPL upgrades piece-by-piece and we'd even venture to say the lowering springs/HAS kit WITH SPL Tie-Rods combination should be a requirement to be done together to maintain proper drivability that BMW engineered it with originally. The tie-rods are only $349 and can be done in less than an hour and adjusted the same time as a routine alignment.


Quote:
Originally Posted by irunalot View Post
Then there is setup time. I have the full SPL setup on my F80 and it takes some who really knows what they are doing to get it set up correctly. I still have some annoying bump steer in the rear and every shop in my area is slammed.
The SPL parts make it easier to adjust settings. Install/Setup time is very much the same as any 4-way alignment.

It's the picking and choosing your own individual camber/caster/toe specs is what takes up the time and multiple track days to dial in. Hardcore guys change these settings for every track they go to, and sometimes every session to get every last tenth of a second.

Quote:
Originally Posted by cfm56d7b View Post
StudioRSR, slightly off topic: do you offer the same parts for F36 series?
We're checking if SPL has confirmed that they have parts for F36.

Quote:
Originally Posted by Pic18 View Post
I recently saw a video in which it mentioned an SPL front upper arm (thrust arm) snapping on track. Not sure of the full background, but would be interested to hear from anyone who has more details or experience with these arms.
If we're talking about the same video/person, we were there when it happened and it came down to a delaminated tire and hitting the wall at over 100mph. Hopefully it wasn't someone else..
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      10-11-2021, 03:07 PM   #10
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I had the full SPL arm kit on my f80. Not sure I would do it again, it took multiple different shops to set it up correctly and it was loud on the rare occasion I street drove the car. It did grip the car up well though. Definitely a "track rat" upgrade and not as much for dual purpose.
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      10-12-2021, 02:45 PM   #11
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Quote:
Originally Posted by corbs09 View Post
I had the full SPL arm kit on my f80. Not sure I would do it again, it took multiple different shops to set it up correctly and it was loud on the rare occasion I street drove the car. It did grip the car up well though. Definitely a "track rat" upgrade and not as much for dual purpose.
Agree with you on the F80/F82 in that it's much "easier" to have noises from incorrect installs. Without trying to sound "sales-y" here...there's 0 knocking noises on our G80 right now. Surprised, but very happy that it's no different than stock. We got asked this question a few times, so we might make a video of it inside while driving.
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      10-12-2021, 03:13 PM   #12
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Thanks for the replies.

Does bump steer only occur at some limit of the factory tie rod ends? So, with these replacements, I could install them and do a standard alignment with no special consideration by the aligner (think big box stores) and that would put me in a good place in regards to eliminating the bump steer?

I wonder how many of the forum folks have noticed this behavior.
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      10-12-2021, 05:57 PM   #13
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Quote:
Originally Posted by mattssi View Post
Thanks for the replies.

Does bump steer only occur at some limit of the factory tie rod ends? So, with these replacements, I could install them and do a standard alignment with no special consideration by the aligner (think big box stores) and that would put me in a good place in regards to eliminating the bump steer?

I wonder how many of the forum folks have noticed this behavior.
Bumpsteer occurs in almost any suspension setup, even factory, but the amount of it is negligible (near zero) from factory design on most occasions.

With the SPL tie rods, doing an alignment is the same. The correction from the SPL tie rods come from the ability to lower the connection point with the spacers and arm design seen here:




When you lower our cars, or any car for that matter, with lowering springs or any other suspension modification, that ~1in change creates a much bigger change in the angle of the rod from the center line and creates a different arc shape of the tie rod when it's moving up and down. The altered arc shape of the tie-rod creates unwanted steering angle (steer) during movement up and down (bump)
Here's the simplest illustration we could find:
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      10-12-2021, 07:53 PM   #14
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Cool. I am considering these for sure.
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