View Full Version : my diy "poly" drivers tranny mount

02-15-2008, 10:35 AM
3 easy steps :p

and yes..i know this is super ghetto but it cost me all of $25 including a brand new mount..$11 for the mount and $14 for the window weld

i get bored really easily...obviously..

if it works, cool..if not ill throw it in the garbage

new mount...


1st listed ingredient.."polyurethane polymer"


still waiting on 24hrs to roll around until its fully cured


02-15-2008, 10:40 AM
do you think 24hrs will be enough since it's so thick?

02-15-2008, 10:43 AM
Nice. Mine was good in less time but I had a ceramic furnace keeping it company. That stuff is listed as super fast curing and is meant to hold windshields in.


02-15-2008, 10:44 AM
i really dont know to be honest...it will be a couple days before i get it installed anyways

02-15-2008, 10:46 AM
Nice. Mine was good in less time but I had a ceramic furnace keeping it company. That stuff is listed as super fast curing and is meant to hold windshields in.

did it work well?

02-15-2008, 10:49 AM
It had slightly more cold idle vibration than stock but nowhere near as much as the solid Stern mount. I don't know how much of an improvement there was but I can say there was no downside.

02-15-2008, 10:54 AM
is that stuff really strong/hard enough to hold up in this application?
when you bond glass to metal, you need a very flexible material to allow for flex and material expansion.
Simply being poly urethane doesn't mean anything. It's the durometer(hardness) of the material that makes a difference in specific applications.

I'd guess this stuff is too soft to really be doing much of anything, but I'm curious to hear how it holds up. I like the idea, but would probably use a different material personally.

02-15-2008, 10:59 AM
when it cures, it isnt as strong as the rubber thats already in there... but, its still an improvement.

its nowhere near as hard as the polyurethane used for snub mounts... this is going to sound much more ghetto than window weld, but i would consider hot glue.. when it dries its much more firm than the window weld...

02-15-2008, 11:00 AM
If you can weld you can make a mount out of hockey pucks, some steel tubing, angle iron, and a hole saw. I was gonna fill my mount too but its not like the stern mount is that expensive anyways.

02-15-2008, 11:02 AM
You are absolutely correct. This does not replace the stock material but merely fills the voids which reduces the compliance of the stock part. I've got no way to test durometer but have a lot of experience with race tire testing on mountain bikes. They feel fairly similar especially after a few days. This seems to be the right material for the job.

I've still got the Stern mount and am looking for a material that could replace one or both washers and provide some damping before trying it again in the spring.

02-15-2008, 11:08 AM
i know w/ mazdas, there is a delrin mount replacement, and the metal sleeve that goes in the delrin is not a tight fit, causing clunks. a few have covered that in WW or epoxy before slipping it in there and it worked well..

02-15-2008, 11:28 AM
wait what kind of tranny mount is that? is it just a stock one rigged with the window stuff?

02-15-2008, 11:30 AM
Take a stock mount and mask the back. Fill the void areas carefully so that there are no air pockets. Let cure.

02-15-2008, 11:31 AM
stock mount

02-15-2008, 11:33 AM
This one shows where the material expanded.


02-15-2008, 11:34 AM
I used epoxy for the mount on my CX-7, in the same place.


I want to use something else because when it cured, it turned into hard plastic=serious vibes in reverse, otherwise it's fine.

02-15-2008, 11:37 AM
Hot glue while has a good density is fragile at best. I would NOT use it.
There are all sorts of 2 component urethanes etc out there in a huge array of hardnesses. A trip to Tap plastics or RS Hughes could be worthwhile. Other companies to order from would be BJB Enterprises, Smooth-On, G.E. etc. There must be something stronger than hot glue but still harder than window seal.
Stay away from single component (air cure) Silicone as it only ever cures about 1/4" into material.

All of these options make it more $. probably not the cheap experimentation stage anymore...

02-15-2008, 11:42 AM
At that point you could mix and pour whatever durometer RTV you wanted. It would be time consuming and expensive. The WW is cheap, available, and is both strong and slightly pliable.

02-15-2008, 11:59 AM
cheap and available ..my kind of deal ;)

02-15-2008, 11:59 AM
I have a spare stock mount if anyone wants it so they don't have down time...just pay shipping.

02-15-2008, 12:10 PM
Have you thought of maybe comparing this DIY setup vs a 034 Street Density Mount which retails for $42?


02-15-2008, 12:20 PM
send it on over and ill install/test and give you my personal feedback [:D]

Don Supreme
02-15-2008, 12:44 PM
Just installed a full 034 street density setup on Sunday, but I have only driven the car once because its pissing oil like a rhino.

Regardless, I was boosting the fuck out of it because the car felt so much more solid than with stock mounts with 120K on 'em!!!!

02-15-2008, 12:45 PM
send it on over and ill install/test and give you my personal feedback [:D]

Well I would be more then willing to give you one at my cost + shipping. Since it is not my product it isn't like I can just send out a part for free.

I have talked to 034 about a GB for their density mounts, they said that if I gave them a list of 10 people they would get them for 15% off and a list of 20 people would get them for 20% off. This means you guys could be paying $33.60 - $35.70 plus shipping for the driverside density tranny mount. This becomes a nice size savings when buying all 4 mounts at the same time. If anyone is interested in doing something like that please let me know and I know a few people that are waiting for a list to form.

02-15-2008, 01:19 PM
I'm down for a group buy on the Transmission mounts for B5 1.8T. Sign me up.

02-15-2008, 01:21 PM
The 034 is better. No doubts there.

02-15-2008, 01:35 PM
Nice! its good to see some DIY effort!

Monkeyboy and I did a very similar thing in '06...so far so good. [up]

We used 94 durometer (very stiff) high temp urethane from mcmaster-carr. With the excess I filled my pass side RS4 tranny mount.

The writeup of the process we used is in the audiworld tech section:
http://www.audiworld.com/tech/eng97.shtml [wrench]

02-15-2008, 01:37 PM
^^^ id be interested

02-15-2008, 02:31 PM
^^^ id be down for a GB as well

DSM 2 Avant
02-15-2008, 07:00 PM
Count me in for a GB.

02-15-2008, 07:41 PM
Well send me a PM with your name and which mounts you want from 034. This way I can make a list and keep you updated on the list.

02-15-2008, 08:35 PM
this magic of turning diy into gb would make Houdini proud. [:D]

02-15-2008, 08:48 PM
my threads have a mind of their own... [rolleyes]