CBC is TRASH! Need recommendations

[Groganrocket]

Originally Posted by b_w.

I thought the instructions say 25 inch pounds but most shops were saying need 35 to keep them from backing out...I used orange locktite 😒

I believe it’s 25ftlbs not inchllbs.

[TractionControlDelete]

Originally Posted by x_

Is there a way to check the CBC without taking bits off the car? Maybe with an inspection camera? I have the EEP one which is more common here.

I never even considered going VTT because of horror stories with them being utter dogshit in everything they do. I also remember coming across very similar failures on N54's with Vargas CBC's.


This is what the EEP ones look like (not my pic, just from the internet)

https://youtu.be/AztGoBfwPtk

[MR RIZK]

Just a data point. The H2M CBC uses oem bolts just longer ones. Here is my install for reference and pictures.

https://f80.bimmerpost.com/forums/sh...php?p=29681766

Not debating what is better but I opted for this CBC as the bolts were the same as oem.

[FrankMstein]

Originally Posted by x_

I'm surprised you can tell the brand by the bolt logo. If it is KPF, wouldn't it be South Korean then?

Based on new info I got last night KPF are produced in either Korea or Vietnam. There is no way to tell unless you see the container they came in.

[Groganrocket]

Originally Posted by MR RIZK

Just a data point. The H2M CBC uses oem bolts just longer ones. Here is my install for reference and pictures.

https://f80.bimmerpost.com/forums/sh...php?p=29681766

Not debating what is better but I opted for this CBC as the bolts were the same as oem.

Where did you get those bolts from, I may change mine out thanks.

[MR RIZK]

Originally Posted by Groganrocket

Where did you get those bolts from, I may change mine out thanks.

They were supplied with the kit.

[FrankMstein]

Originally Posted by DeTh

Is there a place where we can source better quality version of the bolts to possibly replace our CBC plate bolts, to prevent something like this happening?

"I can not become design responsible, I am just quality." is my standard industry answer.

[JAI///M3]

Well if people really are confusing inch/ lbs and ft/lbs when torquing the bolts that is a huge problem. My guess is this isn’t all that’s happeneing here though

PS: I plan to buy ARP bolts direct from ARP to replace the ones that came in my kit

[aa2033]

Originally Posted by hC1001

From what i see, a lot of the issues is when ppl try to remove the bolts and it shears.

Im going to check mine from time to time but i wont dare try to remove them to replace... There is gonna be a higher chance to shearing them during removal... Ill cross that road if i find a bolt head sheared off... I did my own install, used red loctite and torqued them to spec. I think it was around 25lbs.

For all we know, the installers of some of the failures could have torqued them down more than they shouldve.

I'm going to check on mine next time i have the car in the air, but i used blue loctite torqued to 25ft/lbs.

This thread has me worried. Mines not my daily, so I'm not overly concerned since it hasn't been on my car very long. If i find it's moved even the slightest, i'm going to get new oem bolts and take the CBC off.

I'd like to hear from VTT though..

[MINERALGREY_F80M3]

Originally Posted by JAI///M3

Well if people really are confusing inch/ lbs and ft/lbs when torquing the bolts that is a huge problem. My guess is this isn’t all that’s happeneing here though

PS: I plan to buy ARP bolts direct from ARP to replace the ones that came in my kit

If you have the size or link please share, plan to do the same!

[b_w.]

Originally Posted by Groganrocket

I believe it’s 25ftlbs not inchllbs.

Whatever the instructions were I added 10 for good measure.

[Groganrocket]

I just looked at mine and it doesn’t seems to have moved, but the bolts are getting rusty and I haven’t even driven in the rain.

[JAI///M3]

Originally Posted by MINERALGREY_F80M3

If you have the size or link please share, plan to do the same!

Ok the bolts are definitely 8x1.25 (8 qty). As far as length, I would highly advise on verifying your own. I have a precision dynamics hub along with a Kies CBC plate. On this particular combo, the bolts included with the CBC were 35mm underhead length. Since this thread is more focused on the VTT plate, I would measure those if using that plate. Thread depth on the hub is 21mm and the exposed thread length on the stacked CBC is 22mm. That tells me I need to add a washer under each bolt to make sure the bolts don’t bottom out. Kies does include a single 8-hole washer with the plate, but I need a little more room to torque

Here’s a link to the ARP page for the correct thread bolt in variety of lengths with part numbers for both 6 and 12 point heads and stainless/chrome moly options

Good luck!
https://arp-bolts.mobi/p/bulk.php?pl=89&d=7&p=*&w=2

[hC1001]

Originally Posted by b_w.

I thought the instructions say 25 inch pounds but most shops were saying need 35 to keep them from backing out...I used orange locktite 😒

Im pretty sure its ft/lb just by the size of the bolts.

[hC1001]

Originally Posted by b_w.

Whatever the instructions were I added 10 for good measure.

Overtghtening bolts is typically what causes bolts to shear...

[FrankMstein]

If the instructions say in/lb...OMFG which is not going to keep this connected w/o moving, NO WONDER this is moving. That is nearly 3Nm!! That isn't even hand tight!! VARGUS kUaLiTy... gud luc wit dat! That should be 25ft/lb! As in the immortal words of Ozzy Man, that is destination fucked! I'm going to be all day on this one.

[jfritz27]

Originally Posted by FrankMstein

If the instructions say in/lb...OMFG which is not going to keep this connected w/o moving, NO WONDER this is moving. That is nearly 3Nm!! That isn't even hand tight!! VARGUS kUaLiTy... gud luc wit dat! That should be 25ft/lb! As in the immortal words of Ozzy Man, that is destination fucked! I'm going to be all day on this one.

They don't.... the only "official" instructions for the CBC from VTT that I've seen are buried within their spline lock install sheet at the end, but it does say 25 ft-lb

https://vargasturbo.com/wp-content/u...tall-guide.pdf

[MINERALGREY_F80M3]

Originally Posted by JAI///M3

Ok the bolts are definitely 8x1.25 (8 qty). As far as length, I would highly advise on verifying your own. I have a precision dynamics hub along with a Kies CBC plate. On this particular combo, the bolts included with the CBC were 35mm underhead length. Since this thread is more focused on the VTT plate, I would measure those if using that plate. Thread depth on the hub is 21mm and the exposed thread length on the stacked CBC is 22mm. That tells me I need to add a washer under each bolt to make sure the bolts don’t bottom out. Kies does include a single 8-hole washer with the plate, but I need a little more room to torque

Here’s a link to the ARP page for the correct thread bolt in variety of lengths with part numbers for both 6 and 12 point heads and stainless/chrome moly options

Good luck!
https://arp-bolts.mobi/p/bulk.php?pl=89&d=7&p=*&w=2

Thank you! Mine is still in its packaging, ill measure them and use the link provided to get the correct size.

[MagicF8x]

I had all but 2 snap off, they were able to extract the bolts and swap with new oem
Bolts

[MagicF8x]

CBC doesn’t really do anything , their spline lock is definitely the best crankhub solution , my 4 pin practically failed.

These are definitely stress failures,
When my bolts snapped off they were replaced with oem ones.

You can look up those bolts they are manufactured by a company called McCmaster carr out of Illinois and I don’t belive they have the strength that oem bolts do.

[ra2289]

Originally Posted by MagicF8x

CBC doesn’t really do anything , their spline lock is definitely the best crankhub solution , my 4 pin practically failed.

Care to elaborate on the 4 pin issue? Who made it, how long it is was in the car, what the failure looked like and/or any other information you can provide. Very interested as I have not heard of any pinned hub failing.

[b_w.]

Originally Posted by MagicF8x

I had all but 2 snap off, they were able to extract the bolts and swap with new oem
Bolts

How long was it installed for?