03-23-2023, 03:36 AM | #1 |
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SPL Rear suspension arm's unwinding
Hi All,
Recently installed SPL rear toe and traction links on the M2. over the course of a few days and a long drive to a track near me the arms had loosened with the car throwing a series of codes, the car feeling pretty skittish and one of the rear wheel visibilty toe'd out. i did have a bit of weight in the rear of the car with a jack, track bits and pieces and a set of track wheels/tyres.
SPL's recommended setting for the locking collars is very low at 150 in-lb / 17nm so im pretty confident they were well above that Anyone with a similar experience or advice? |
03-23-2023, 08:24 AM | #2 |
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First I've heard of this!
I have some to be installed soon. VERY interested to see a solution. It might be worth contacting SPL on this. This style was supposed to be an improvement over the jamb nut style
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03-23-2023, 04:44 PM | #3 | |
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OP uses M4 GT4/M2CSR arms and you won't have problems again. Last edited by Track/S; 03-23-2023 at 05:12 PM.. |
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03-23-2023, 08:29 PM | #4 | |
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dissapointing |
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03-23-2023, 08:44 PM | #5 | |
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Did they give you a torque spec? Just to clarify; It's the blue clamping bolts that are becoming loose? And not that they don't clamp tight enough? It shouldn't be needed, but what about some blue loctite on the bolts?
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03-23-2023, 09:30 PM | #6 | |
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i havent fully got a handle on how the failure is occuring, ie, -is the bolt backing out, or, -is it tight but just insufficient to hold it ...the end result is that you can twist the arm by hand when off the ground once whatever is happening has happened. ill be driving it for a week or so then jacking it up at home and investigating further. Last edited by Luke AUS; 03-23-2023 at 10:20 PM.. Reason: typo |
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03-23-2023, 09:39 PM | #7 |
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Although this may not be the cause for the issues with your toe arms, I'd strongly suggest getting a eccentric lockout kit for the spl arms to hold the toe in place under heavy cornering. They are made by SPL also
(Eccentric Lockout Kit for Rear Toe Arms (F8X M2/M3/M4 EL F8X 2014+)
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03-23-2023, 09:59 PM | #8 | |
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03-23-2023, 10:05 PM | #9 |
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Ah yes I can see them now on the second picture
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03-24-2023, 08:56 AM | #10 |
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Are the locking bolts stripped in the threads? If you over tightened them, they couldhave deformed threads which could lead to back out.
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03-24-2023, 11:10 AM | #11 |
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I've had zero issues with the SPL arms adjustments loosening up. I torque everything to their specs.
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03-24-2023, 11:32 AM | #13 |
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I deal with a fair amount of SPL stuff and the first thing I noticed was the clamping bolts do NOT need loctite, they need anti-seize. When you thread a steel bolt into aluminum with no lubrication, you loose too much torque to overcoming friction which, in turn, doesn't provide the clamping force it should be on the torque being applied.
Leaving my personal and professional feelings aside about SPL parts, this is a must-do to get that design to clamp (or at least have a chance of it clamping). I agree with the other comments in this thread that jam nuts are likely a better way to this, but if that isn't an option try anti-seize on the clamp bolt. |
03-24-2023, 04:05 PM | #14 | |
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The SPL bolts are Titanium, is the theory the same as steel?
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03-25-2023, 12:15 PM | #15 | |
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During usage the bolt (head/shank) can unwind returning to same position there were when the threads seized which is why there is a loss in overall clamping force. That's why putting anti-seize on the threads and the head of the bolt, where is interfaces with the clamping ring, makes such a great difference in actual clamping force. It also prevents the bolt from getting stuck when you go to remove it, so it's a win-win. Last edited by D.Yooras; 03-27-2023 at 05:15 PM.. |
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03-26-2023, 10:42 PM | #16 |
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03-26-2023, 10:46 PM | #17 | |
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