tillery

iTrader: (4)

BTW this is a Spohn tunnel mount TQ arm. You can see where the bolts were tightend against the Tq arm before the bushings.

SS1875

iTrader: (34)

Had the same problem when I had my Moser 12bolt and Spohn TA....broke the same exact way. Replaced the mount and had to helicoil the bolt holes and use bigger bolts. Moser's design of 4 bolts into blind holes is not good.....too many times I had to re-tighten them (each time using thread lock)eventually it took it's toll on the TA mount.

BlackDuk98

iTrader: (34)

This is exactly what I asked UMI over a year ago. It just looks like it's going to snap. I'm waiting for it to happen to me. When it does, I will make the part myself. I was basically told when I asked them about it "Looks good to me, it is safe". Personally, I wouldn't build or sell a piece that has holes that close to the edge. But that is what I am running right now on my car .
Here are the pics I sent them. Plus, the numbers you see should be smaller than they are since that also includes the thickness of the powdercoatings...

bottom hole

top hole

tillery

iTrader: (4)

I can see how these got a bad rap. 4 bolts into the blind holes dont seem sturdy.So when installed the bolts are over tightend. Pulling the threads out. Just because a person cant hear the frequencys given off by the gearset dont meen its not happening. And these Frequs can lead to failure. I havent had any problems with mine since I fabed this hardware. Im only making around 420 at the wheels, and 390tq. It wont be till late march till I see if it will hold up to a stroker but would like feedback from a suspension sponser with an open mind on my solution.

MeentSS02

iTrader: (11)

The thinnest measurements on that torque arm bracket are not the direction that the bolt would be most likely to tear out...at least not to me. Either that or my engineering sense has left me altogether...but the torque arm keeps the axle from rotating about its longitudinal axis, so if that bolt tore out, it would be along the torque arm's long axis (which is not the direction of the thinnest part of that bracket, and after looking at the pic in the first post, it tore out towards the back, not the side).

IIRC, the stock torque arm doesn't have much meat in that direction either to clear the housing.

I think what is going on here is two-fold - the first being that a bolt is not a locating device (locating is the job of a dowel pin). It is intended to clamp. In order to bolt something together, it requires that the flange hole be larger than the bolt's diameter...otherwise, you'd have a bitch of a time getting the parts bolted together. If that bolt starts coming loose, you are going to start getting some pretty decent shear loads. Pair that with Moser's less-than-stellar design that puts those bolts in single shear, and in an environment that I can only assume is being subjected to some pretty decent vibration from the drive shaft and the rear's internals along with the jarring of going over any road surface - well, it isn't exactly a friendly environment for anything that is trying to stay tight in a blind bolt hole.

UMI Performance

iTrader: (77)

If those are Moser bolts... Moser uses the incorrect bolt size, factory uses a 14mm bolt while Moser uses a 1/2" bolt. We drill our holes slightly larger for installation and ease... also we have found the tolerances of the rear end mounting holes to never be the same between brands.

Again, we have only had this issue with MOser 12 bolt rear ends and there silly mounting design. We have have seen the same issues happen to BMR and Spohn torque arms as well.

UMI Performance

iTrader: (77)

Exactly what I was trying to say... thanks for sharing your experience

03 BUSA

iTrader: (25)

Blackduk98, .114 is a joke. I would think a neon would snap that eventually. Either way I thim UMI needs to step up and get this guy taken care of. But I will be honest after seeing this I am glad I do not own any UMI stuff and I will not ever in the future and won't recommend it either.

UMI Performance

iTrader: (77)

Wow... always great to see the mature side of people come out

We have vehicles running single digits every day on that torque arm. Check out our video section on the website.

The torque arm broke because of a Moser 12-Bolt issue... this is a rare instance is ONLY happens with the Moser 12-bolt... do some research and you will see other manufactures with the exact same problem.

The customer called and has been taken care of, no one said we wouldn't take care of him... we just a few questions to determine the break.

MeentSS02

iTrader: (11)

Go back to the first post and look at how that hole tore out - it wasn't along the direction of the 0.114" measurement.

I'd highly recommend doing some serious thinking about this before you go bashing UMI - IMO, this was NOT their fault. This one's on Moser.

wvaboy

iTrader: (3)

talked with jerry, i've got to send him some more pics. he suggusted a longer bolt, (which i believe i have) and to spot weld it after installed which also wouldn't hurt.

tillery, thanks for the pics, i may have nicks shop try that also. makes more sense after seeing the pics. i just don't want this to happen again. hopefully that's all the damage there is.

thanks jerry, i'll send some more pics over. give me a buzz if those don't do it. sorry, it's difficult to take good pics with car on jack stands.

Pro Stock John

iTrader: (34)

03 Busa it appears that the customer and UMI are in contact and are figuring stuff, so please do not fan the flames beyond this point.

I have used their tq arm and have gone 1.3's with it and 9.9@140 with it.

HUNTER02SS

iTrader: (24)

You do realize that the forces put on the TA mounting points are Vertical(Up and down) and not Horizontal(left to right). You could have slots cut into the mounting hole and it will still hold PROVIDED the THREADED HOLES in the rearend HOUSING will hold! You need a lesson in rearend geometry and what everything is back there for! This IS NOT UMI's fault!

03 BUSA

iTrader: (25)

Point taken guys, not trying to bash anyone but I see it is ok for everyone to just bash MOSER and point the blame elsewhere. I will retire from this thread. Glad to see the customer has gotten taken care of in the end.

UMI Performance

iTrader: (77)

Thank you. And I am not bashing Moser, however I do not agree with there design on this particular rear end, it has caused us and many other suspension manufactures grief I am sure. We are only pointing blame because we are very confident this is the issue... otherwise we would take blame with no questions. I have owned a Moser 12-Bolt myself and I am familar with its mounting locations.. I encountered the same problem in the past.

Anyways, thanks again
Ryan

wvaboy

iTrader: (3)

double checked, bolts used in 12 bolt were "longer" bolts.
pics sent, i'll call you guys tomorrow.
obviously there is an issue somewhere, just need to address what will work so that this won't happen again.
thanks guys

with a 12 bolt moser? what did you do to keep it from coming loose? my car has only been to drag strip 1 time with said 12 bolt and suspension work. i'm on 19's for gods sake....lol, imagine how quick it would have been gone if i were on mt's and going to the track every week like most guys in this area?
i believe tack welding sounds like maybe the best idea, maybe tillery's idea or even both together.

wvaboy

iTrader: (3)

not great on geometry, but it looked like mine broke from going front to back, the bolt is still in there wrench tight. not sure it makes a difference in theory, but mine is a tunnel mount. slots cut in bracket would not have held in this case, ie picture.

it definately would have helped solve this in design by making bolts go all the way through the rear end though. a new rear end is probably (knock on wood) not a viable option for me.

MeentSS02

iTrader: (11)

You have to be careful with longer bolts too - if you bottom them out, you won't get the proper clamping force required to hold the torque arm in place.

I'll sit here and bash Moser "Engineering" all day long on their 12-bolt design - 4 short bolts going into blind holes in single shear is poor engineering in a component this critical. At the very least, they should provide bolts that have had the heads drilled for safety wire.

tillery

iTrader: (4)

I know there is a differance in bolt sizing, And because all you suspension experts who claim your product dont fail. Why dont you open your mind to a fix to something you havent. The bolt in the pic didnt fail, the mount did. A bushing made to correct a aftermarket defect can work. I made mine to the thickness of the mount so overtorquing wont happen and stress the material. It holds it firmly in place and I havent had ANY problems. Two bolts or four, it dont matter as long as it is installed with proper hardware.

tillery

iTrader: (4)

I think PSJ was talking about UMIs TQ arm.