02-14-2016, 04:30 PM | #1 | |||||||
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Crank Hub Issue Master Thread: What You Need To Know!
TL;DR:
1. DO NOT replace the OEM Crank Hub with the TPG Tuning Crank Hub! 2. If you have installed it already you now have a ticking time bomb. If it fails it will fail in a worse way than the OEM crank hub potentially causing more damage to your motor. 3. Possibly speculations lead to the heavy use of the kick down being a possible cause of the crank hub spinning. This is just a speculation! 4. The same part has been used on high power N54 and N55 motors with out this problem. (adds to the speculation behind the DCT maybe causing this) ============================== Poll (answer it!): https://f80.bimmerpost.com/forums/sh...php?p=24053449 ============================== Overview: The point of this thread is to bring proper awareness in regards to the S55 crank hub and TPG Tuning. There are currently many threads with lots of information, but the issue is the important and relevant information is buried within hundreds of posts. Unfortunately, TPG Tuning created this entire mess when they started pushing out the word that you should replace this part to prevent catastrophic engine failure. ============================== What you need to know about TPG Tuning and their crank hub Back in August of 2015, TPG Tuning came out with this large post claiming how they found the weakest point in the S55, the spinning crank hub. They claimed that this issue exists in stock cars, but is more prevalent in cars with increased power. Being a vendor on the forum one would assume this company knows what they are saying and has done the necessary research and development to back this all up. Well that's where things go wrong. Let's start by going through all the reasons you should not trust TPG Tuning. Lets start by picking apart TPG's original statement seen here Quote:
Catastrophic Engine Failure This was simply a marketing scare tactic TPG created to help drive sales for their overpriced OEM hub that they made minor modifications to. Of the failed crank hubs (low reports) there are no reports AFAIK of the engine being catastrophically damaged. The chance of your engine being damaged is actually far more likely with the TPG crank hub as explained below: Quote:
TPG originally claimed this was the purpose, but after heavy criticism they changed their statements to it being solely to help position the crank hub during installation. There are many issues with these statements. Quote:
2. Now they've changed the design of this part to be solely to help position during installation. In my opinion this inherently is suggesting BMW has an assembly problem which basically renders this part useless. When TPG was questioned about all these inconsistencies they stopped responding. ============================== Research & Development TPG has none of this. All of their research is based on a small sample set. For some reason they concluded this was an issue with barely any information. They also have very little knowledge or understanding of how to develop a part of this complexity. People with far more knowledge were able to push them over the edge and leave them answerless to many technical questions. Also the design is like no other. They decided to make a half circle groove with a pin instead of a square peg. Their reasoning was to remove less material. Unfortunately, they still were unable to answer any questions in regards to properly testing this part besides installing it in their own cars. TPG showing they don't have a clue what they are doing Great analogy for why this part makes no sense... Quote:
Quote:
The OEM gear showing stress marks in it. This should've been a huge red flag when TPG considered cutting a notch into this part a reasonable way to fix the problem. ============================== Intentional Built-In Fuse? There is speculation that BMW intentionally did not key the crank hub because they essentially designed it as a fuse so if you money-shift the car you're less likely to destroy the motor. ============================== Easier to Assemble: There is speculation that the reason the crank hub is not keyed is because it makes assembly much simpler. Quote:
DCT Speculation / Aggressive Shifts: From what we know it appears a lot of the cars with this issue are DCT. This is either because there are a lot more DCT than 6MT (perfectly valid) or maybe something in the DCT is just very different. When you look into how the DCT shifts it does it much faster than any human could. In the most aggressive state it will shift at 8ms. Quote:
List of failed crank hub cars This is a list of all of the cars that I have been able to collect regarding failed crank hubs. Note that two or more of the cars were built in late 2014. If you can provide any more information to this list please comment and I will add it. BrokenM4 Build: 11/14 OEM Failure: YES Mods: JB4, Map 8, running meth additive of 30. E85 mixed (3 gallons) Transmission: DCT Notes: Failed during data log 2nd-4th gear run w/ 6300RPM shifts sA x sKy aka Sameet Build: 11/14 OEM Failure: YES @ 13k miles TPG Failure: YES (3 total) @ 13k, 17k & 17k miles Mods: Upgraded Turbos, etc Transmission: DCT Notes: Failed during use of kick down BarronM Build: def after 11/14 OEM Failure: YES and replaced with OEM Mods: ? Transmission: ? BlueBYyouM4 Build: late 2014 OEM Failure: YES Mods: FBO + Meth Transmission: DCT Blipit Build: ? OEM Failure: YES Mods: ? Transmission: ? chrisjguzman Build: ? OEM Failure: YES Mods: ? Transmission: ? Pennzoil Build: 8/14 RHD OEM Failure: 1/3 tooth spun TPG Failure: NO Mods: FBO + JB4 + 50:50 meth , using oct93 (ron98) pump gas only Transmission: DCT Undisclosed Name Build: around 8/2015 OEM Failure: YES Mods: Upgraded Turbos, etc Transmission: DCT Notes: Failed during use of kick down Undisclosed Name Build: before 11/14 OEM Failure: NO TPG Failure: YES Mods: Upgraded Turbos, etc Transmission: 6MT Undisclosed Name Build: 11/14 OEM Failure: NO TPG Failure: YES Mods: FBO + Tune (ESS Estronic) Transmission: DCT Notes: Failure caused catastrophic engine damage. Valves were bent etc. M4 CSL Build: 10/14 OEM Failure: YES Mods: FBO Transmission: DCT Total OEM Failures: 8 Total TPG Failures: 5 Builds w/ Similar Production Dates: 8 ============================== Jason from TPG spewing off bullshit with all his fan boys / employees trying to back him up. Just shows further how half the people that make the claims are all on the TPG side. Anything in regards to the crank hub problem itself is simply speculation. There is no confirmation on if this problem exists or does not or what causes it. This post is simply a place to combine all the thoughts regarding this issue. I also want to thank all the members of the forum that put in a lot of input in the related crank hub threads. Thanks to Kr3st for bringing the topic back into the light. Thanks to Boss330 for writing some amazingly detailed posts with some very valuable information. Thanks to sA x sKy for providing some good photos. Thanks to Powaup for starting the very useful poll If anyone thinks i've missed valuable information please let me know and I'd be happy to add it. ============================== Sources: TPG Tuning S55 Crank Hub Official Thread: Report Here if you Spun your Crank Timing Gear Hub. Crank hub fix? You decide. Poll: Crank Hub issues
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Last edited by JcLusso; 11-30-2018 at 09:37 AM.. |
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02-14-2016, 04:42 PM | #2 |
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Thanks for compiling all of this in one post. For someone who hasn't followed the numerous pages of multiple threads on this topic, this makes it very easy.
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02-14-2016, 05:58 PM | #5 |
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02-14-2016, 06:25 PM | #6 |
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nice thread , and i filled up the missing part
Build: 8/14 RHD OEM Failure: 1/3 tooth spun TPG Failure: NO Mods: FBO + JB4 + 50:50 meth , using oct93 (ron98) pump gas only Transmission: DCT
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02-14-2016, 06:33 PM | #7 |
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What is the point of this thread? It reminds me of the OP bumping the facebook thread as an "I told you so". We get it. They thought they were helping the community, and it doesn't help. It wasn't a scam. It was a vendor really trying to help out, and created a product that doesn't actually help.
If they had the data they have now, they would not have released it, I'm sure. The majority of the OP is a FB punking by the OP over and over. We get it.. you were right. Everything here is a repost of the more complete thread. I suggest folks educate themsleves there, and not in this gloating thread. |
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02-14-2016, 06:35 PM | #8 | |
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Quote:
So until TPG quits the crap this is the kind of thing they'll need to deal with. You say if they had the data they have now they wouldn't have done this, but instead they continue to sell it and up the price.
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02-14-2016, 06:35 PM | #9 |
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As your failed TPG crank hub list, there only found 4 hubs failed i can count , 3 was sameet , 1 was undisclosed name , both are upgraded turbos
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02-14-2016, 06:45 PM | #10 | |
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The point is that there is a TON of evidence readily available. Why the repost, except to gloat? |
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02-14-2016, 06:49 PM | #11 | ||||
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Quote:
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Must have counted wrong. I'll fix this.
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Last edited by JcLusso; 02-14-2016 at 06:54 PM.. |
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02-14-2016, 06:55 PM | #12 | |
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02-14-2016, 06:57 PM | #13 |
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There are hundreds of threads in this forum that someone thinks there is no need for. Just move on.
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02-14-2016, 07:06 PM | #15 |
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02-14-2016, 07:11 PM | #16 | |
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I mean normally most people don't have time to read through 10+ pages, but since I've been following this and am currently sitting on a 6 hour flight, I figured this would be a great use of my time and helpful to many people.
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02-14-2016, 07:12 PM | #17 | |
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Quote:
This is actually one of the more informative ones. It's providing a warning to prospective buyers who may ruin their car with this bad part.
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02-14-2016, 07:13 PM | #18 |
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Thank you for putting this together in a more organized post! I guess I brought some issues to light, eh?
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02-14-2016, 07:18 PM | #19 | |
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Based on the lack of response from Mr. Smith, I think I hit the nail on the head and your FB antics compadre resurfaced here. Cool that he drives a car that doesn't even have an engine that matters to this topic. |
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02-14-2016, 07:25 PM | #20 |
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I was actually out getting a haircut, life goes on beyond the computer you know, unless of course all you do is spend time online trolling helpful threads.
This isn't to gloat, this is to warn people that there is a company out there still selling a product that is a waste of money and also can lead to engine failure. Also, what car I drive doesn't mean anything, my knowledge does but congrats trying to use the old "u don't even have an M bro u can't talk excuse". And btw did you just get your F82 a week ago? Hahah
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02-14-2016, 07:26 PM | #21 | |
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Also, why are you wasting people's time commenting with these useless meta-conversation comments. If you don't like the thread, don't follow it. Simple as that. Stop wasting everyones time!
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02-14-2016, 07:29 PM | #22 | |
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Are you going to repost Boss quotes in here too? All the more valuable. Thanks again. Peace out. |
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