04-27-2024, 03:38 AM | #111 | |
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To be honest, all these kist N new companies with different options gives me a little bit of a headache. I sure would liek to know which option is best in the long run & allows us to make our X3 M's stronger without the sacrifice of more noise & harshness in the cabin. If this were a track machine & didn't spend most of its time on the street, then we would be having a different conversation. I respect VVT & all they make. Just wish someone would make a definitive guide to all this & clearly show all the possible options with their pro's & cons.
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04-27-2024, 07:00 AM | #112 | |
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04-27-2024, 09:47 AM | #113 |
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Given the many available 'solutions' for the rear differential bushing and bolt issue it seemed a list might help organize. If anyone sees errors or omissions - suggest changes in a post and I'll keep it edited for accuracy. I've referenced and linked this post in the OP so it'll be easier to find (just like I did for the 1/4 Mile Leaderboards). Not all forum members use social media so references to those sites aren't available to everyone.
BMW F97 X3M/F98 X4M Rear Differential Bushing/Bolt Fix Options Bolt only options -BMW OEM -Belmetric bolt (see details in joebie3's post - https://x3.xbimmers.com/forums/showp...&postcount=242 ) Bushing only options - Vargas Turbocharger Technologies [VTT] Rear Differential Bushing Insert Bushing and Bolt combination options -BMW OEM -Einhorn Industries Unicorn Egg Billet Aluminum Rear Differential Rear Bushing and Belmetric M14 Bolt with matching washers and lock nut -Vargas Turbocharger Technologies [VTT] Rear Differential Bushing Insert Kit (also available for the front bushings) ---- -Ryan Morard Facebook bolt, sleeve and collar solution apparently he has 3 solutions per Bimma360 (a 12mm bolt kit (the original), a 14mm bolt kit, and a full urethane bushing kit as he described in post 92 @ https://x3.xbimmers.com/forums/showp...9&postcount=92 ) -Clint Hightower YouTube Rennfix.com Bolt Saver Solution -FJ MotorWerkes Rear Differential End Bushing, Bolt, and Collar Upgrade -AshtonPJT - 85A Shore polyurethane bushing, M14 Gr12.9 bolt, and nylon locking nut [ https://x3.xbimmers.com/forums/showp...&postcount=215 , https://x3.xbimmers.com/forums/showp...&postcount=235 ] Bracing only options -JXB Performance Driveshaft Center Support Bearing Carrier Upgrade -Vargas Turbocharger Technologies [VTT] Billet Differential Lock Down Kit Last edited by Max Well; 07-04-2024 at 04:47 PM.. Reason: Added link to joebie3's details post on the Belmetric bolt |
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04-28-2024, 11:10 AM | #114 | |
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Another favor, does he have an email listed? A free gmail account? The link forces me to sign in, aint creating an account on that shit. Thanks |
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04-28-2024, 11:12 AM | #115 | |
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I think I will replace my OEM bushing and OEM bolt, then use renfixx's kit. Only need to figure out the OE part numbers. Can someone confirm I'm looking at the correct parts? The bolt is obviously #11, is the bushing #10? Last edited by TacosRule!; 04-28-2024 at 11:26 AM.. |
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04-28-2024, 03:41 PM | #116 | |
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We're not on social media either, so maybe some from our forum here can comment if they get some experience with them. And I can confirm from my BMW Svc Ctr invoice from late Feb '24 when I had my OEM bushings/bolts replaced, that the part numbers are as your png illustrates. Mine listed the combination nut (12 in your diagram) as well, and since you didn't highlight just wanted to make sure you're also getting that. |
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04-28-2024, 08:31 PM | #117 | |
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04-30-2024, 01:15 AM | #118 |
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Has anyone with an LCI X3M had their bolt fail or bend?
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04-30-2024, 05:09 AM | #119 |
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Yes D-Pat Murph shared an image of his 2022 Malachite Green X3MCs failed bolt in his thread I linked in my OP. He said it was OK to share that image here (thanks,D-Pat Murph!), so Ive added it to my previous compilation image.
As he ordered his X3MC 9 Mar 2022, and I think it was delivered week 22 of that year, if FJ MotorWerkes comment about a new OEM bolt being introduced in 2021/22 is true, then surely his wouldve been the upgraded one? As Ive not seen anything definitive regarding if/when BMW did a bolt upgrade Im not accepting as fact yet Does anyone know if the Morard, Hightower, and/or FJM solutions protect that 1-2" apparent flex zone, or is their structural improvement distal to that area? |
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04-30-2024, 08:00 AM | #120 | |
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The FJ Motors works the same as rennfix, they add the last 1" or so poly "collar" that fills in the gap in the OE bushing. Last edited by TacosRule!; 04-30-2024 at 08:11 AM.. |
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04-30-2024, 05:18 PM | #121 | |
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Some cursory thoughts: -would like to compare images of the 'failed bolts' with those collar, sleeve concepts which he indicates still occur to the OEM ones which have fractured. Do they look the same? -I've done over 40 stock launches at the Strip and always drive in Sport/Sport+ (never Comfort), and my X3MC was 4-1/2 years old, yet my bolt was just mildly bent, so surely there must be other variables leading to complete failures, such as just variations in metal structure during manufacturing which leads to some bolts failing more quickly? Solutions are present, but choice comes down to protection from high power forces vs NVH? Seems its up to us to decide where we land on that scale... |
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04-30-2024, 05:30 PM | #122 |
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Yeah I was also confused by Clint's video you posted. His review vid on the einhorn was also what drove me to get it. Honestly I trust all the guys on this thread in particular.
I think the variation you allude to is the "revised" bolt whose picture was posted here, and based on the info from FJ. I'm getting the FJ Kit. I like Clint's since its cheaper but using the OE bolt (again) is a turn off. The FJ kit seems simpler to install, which means faster which means cheaper to run. Wish me luck |
04-30-2024, 06:37 PM | #123 | |
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04-30-2024, 09:54 PM | #124 |
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Got Ryan's kit in the mail today. Already ripped out the VTT brace. I'll have the new bolt and sleeve installed tomorrow most likely.
Last edited by Bimma360; 04-30-2024 at 10:02 PM.. |
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05-01-2024, 04:25 AM | #125 |
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Removed the Vtt insert kit due to clunking when shifting park to gear and simply on / off pedal to maintain speed, constant clunk. For me there was too much of an increase in deceleration whine from diff also. I re installed a new factory bolt and all noises are gone. I'm now looking for another solution. I don't launch often but want some protection. I could have dealt with the diff whine (not terrible) but the on / off pedal clunk along with the into gear clunk to a lessor degree was a deal breaker. i think it's too sophisticated of a vehicle and too well designed to have drive line clunks all the time. Btw, i think the Vargas insert would be effective if you can deal with the NVH...
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05-01-2024, 08:14 AM | #126 | |
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Can you post pics of the kit please? Also does he have an email or is possible to coax him into posting here so that we can look at/order his kits? |
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05-01-2024, 09:11 AM | #127 |
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Hey Gus, somebody said that there were some questions about the polyurethane bushing kit that I make. Feel free to contact me or message me for details.
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05-01-2024, 09:51 AM | #128 | |
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1) can you please post pics of your kits? I understand you have several. 2) do you reuse/use a new OEM bolt in any of the kits? 3) do you replace the metal sleeve in the OE bushing? 4) Costs Thank you for dropping by. Looking forward to the info. |
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05-01-2024, 10:59 AM | #129 |
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What a mess... decided to bite the bullet and just get the Einhorn installed next week (along with low-dust brake pads). Seems to be reports of noise with all of these solutions so I may as well use the strongest one. And noise doesn't bother me unless it's really bizarre. Guess we'll see.
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05-01-2024, 11:17 AM | #130 | |
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Good luck, keep us posted. |
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05-01-2024, 11:25 AM | #131 |
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For those changing out their OEM bolts - if you share a side image of your bolt as I've shown in the comparison photo I can size it and add to the compilation.
To be more useful as reference it would probably be helpful to also keep track of: pre-LCI vs LCI, total mileage, bolt/vehicle age, power output (stock, St1, St2, St2+) and rough idea of launches (none, few, moderate, a lot). For my image as example - pre-LCI, 40K miles, 4-1/2 yrs old, stock, a lot |
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