I was wondering about solid mounts. In the product description it is said that they cause accelerated metal fatigue. Will an x-brace,strut bar, subframe plates, and strut tower plates prevent damage? Would i need stitch welding? Is this a really bad idea for a car that is used on both street and track?

Id say not a great idea, you dont realy gain much by using them imo

ok well i think im gonna use rogue tranny mounts, is there a happy medium like this for the motor mount?(i saw some motorsport group n ones , of stock design but harder, they were $700 though!!)(IIRC)

So, uh, what exactly are you trying to accomplish?

rogue mounts are great and yeah why did you even consider soild stuff?

well i here all these horror stories about driveline movement, also they lower the drivetrain a little. Since i bought this car in an undrivable condition from a lady who hit a dear for a $1000, i have not actually driven it yet, so i havent experienced this movement, but trust im just trying to eliminate any weak points while everythings apart.

If you don't know why you shouldn't use solid mounts on the street, you shouldn't. Yes, metal fatigue would be a huge problem. I doubt you plan to check your motor mounts before you leave the driveway every morning.

well i had a feeling i could not get away with this but i just wanted to here it from you guys.

I love Rogue and have a lot of there stuff, including their tranny mounts, but IMHO, they may not be enough for track work. It seems my tranny moves around more with them than it did with the UUC reds w/ TME's.

I love Rogue and have a lot of there stuff, including their tranny mounts, but IMHO, they may not be enough for track work. It seems my tranny moves around more with them than it did with the UUC reds w/ TME's.

Ask Eric about his UUC reds....

ok well i think im gonna use rogue tranny mounts, is there a happy medium like this for the motor mount?(i saw some motorsport group n ones , of stock design but harder, they were $700 though!!)(IIRC)

I'm using the Ireland Engineering polyurethane tranny and motor mounts with really good results.

I dont see the value vs. the risk even in my race car.
Silly idea for the street.
Dont do it - little gains.
More feel then anyting.

Ask Eric about his UUC reds....

Did they rip in half? Rob said that was a bad batch . . .

Can someone explain the reason for tranny mounts? I have a problem with my new 330ci that I am unable to downshift back into 2nd gear if the car is not leveled enough on the track. Keep in mind that I'm a rookie and I should probably be in the right gear before making the turn, but I know that if I go for the downshift as I come out of the turn on some turns it just won't let me put it in gear. Is that due to tranny flexing?

Bryan (and others).... are you running solids at the motor and the transmission on your track cars? Are you seeing any accelerated wear on the mounts?

Bryan (and others).... are you running solids at the motor and the transmission on your track cars? Are you seeing any accelerated wear on the mounts?

Nope...we are running Gruppe N mounts right now. We've considered solids (much cheaper), but we haven't wanted to deal with any accelerated wear. We might switch to them in the future.

I was told that bigger motor-mount washers go a long way towards protecting the front sub-frame metal, even with OE mounts.

What exactly are the advantages of the upgraded tranny mounts such as the UUC ones?

Nope...we are running Gruppe N mounts right now. We've considered solids (much cheaper), but we haven't wanted to deal with any accelerated wear. We might switch to them in the future.

The reason I was asking is that conventional wisdom would lead one to think that you would want either solid motor mounts <or> solid transmission mounts, but not both. Reason being that you need some flexibility in the driveline so you don't start breaking stuff.... but not so much flexibility that you can't make your dang 'ol shifts.

You can have the best of both worlds with the new UUC RACE Version Transmission Mounts:

http://www.uucmotorwerks.com/TMR/TMR_files/STME450.jpg (http://www.uucmotorwerks.com/TMR)

These will give the fundamental benefits of strength and near-elimination of movement as you would get from a solid metal mount, but do provide a fair amount of vibration isolation.

The critical difference between these and a standard-type mount (either BMW or UUC) is the bolt-through design. Standard mount bushings have two seperate bolts embedded in the isolation material (whether it be OE rubber or UUC neoprene). The RACE mounts have a single bolt that goes all the way through, eliminating tension (pulling) movement of the bushing. The RACE bushings are made of a high-durometer urethane to absorb some vibration.

Although some users have reported minimal vibration, there definitely will be some vibration... if it's acceptable on your own street car is a personal decision.

More details:

http://www.uucmotorwerks.com/TMR



.

Rob, give me a free set, and i'll run'em street/track and report back. :devillook

Rob, give me a free set, and i'll run'em street/track and report back. :devillook

You... I'm not so sure about you, you're trouble. :D j/k

- Rob

You... I'm not so sure about you, you're trouble. :D j/k
- Rob

I've got the UUCs with the cups... may be willing to try these out and see if it helps eliminate the 2-3 shift under accelleration issues we see.

The critical difference between these and a standard-type mount (either BMW or UUC) is the bolt-through design. Standard mount bushings have two seperate bolts embedded in the isolation material (whether it be OE rubber or UUC neoprene). The RACE mounts have a single bolt that goes all the way through, eliminating tension (pulling) movement of the bushing. The RACE bushings are made of a high-durometer urethane to absorb some vibration.


would there be any shear stress on the bolt that would eventually lead to a bolt breaking? just wondering.

for those having problems with rogue mounts are you running stock engine mounts? imo filling the voids in the engine mounts with urathane restricts the movement alot and you might find that the upgraded tannymounts dont need to be replaced. Imo it has to be a system, and for the street rogue mounts alone are fine but on the track it helps to have more, im not a fan of pure urathane mounts after seening many crack.

would there be any shear stress on the bolt that would eventually lead to a bolt breaking? just wondering.

If there was enough shear stress to break the bolt, imagine what it'd do to a piece of rubber. ;)

The reason I was asking is that conventional wisdom would lead one to think that you would want either solid motor mounts <or> solid transmission mounts, but not both. Reason being that you need some flexibility in the driveline so you don't start breaking stuff.... but not so much flexibility that you can't make your dang 'ol shifts.

Conventional wisdom to me would be that you'd either want both solid mounted or neither.

would there be any shear stress on the bolt that would eventually lead to a bolt breaking? just wondering.

Shear stress sufficient to break these bolts would be of the kind suffered in a chassis-distorting crash. At that point, the condition of your bushings is close to the last thing on your mind.

The stability of a mount like this, if anything, would protect the hardware even more. Solid mounts are proven to be reliable in race conditions, and the stresses that they convey could be considered greater than a damped urethane mount such as this.

We used to private-label manufacture this kind of mount several years ago, and none of those applications developed problems as far as we know.

- Rob

are matching motor mounts in the works?

Did they rip in half? Rob said that was a bad batch . . .

They did more than rip in half... they completely disintegrated. I dont blame UUC though (but a replacement would be nice). Its my own fault for not checking them as a "consumable" item.

Like other race parts, these things should be checked out frequently... as a cracked mount can go south REAL fast. This lead to my trans moving around more and Im not sure if the mounts were the cause of a transmission leak or if the leak itself weakened the mounts.

I didnt have time to email Rob for replacements for for a quick fix I put in BMW mounts.

I dont blame UUC though (but a replacement would be nice). Its my own fault for not checking them as a "consumable" item.

I didnt have time to email Rob for replacements for for a quick fix I put in BMW mounts.

We'll cover it... shoot me an e-mail with your name & address or order number, send to rob@shortshifter.com

- Rob

They did more than rip in half... they completely disintegrated. I dont blame UUC though (but a replacement would be nice). Its my own fault for not checking them as a "consumable" item.



Ditto - I installed mine in April and here's what they looked like when I removed them last week. I've since replaced them with the newer "bolt-through" red ones, hopefully they will hold up. I'll be keeping a much closer eye on them from now on however.....

Vern

They did more than rip in half... they completely disintegrated.

Wow.:eek: That's just plain . . . wong.
:stickoutt