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Anyone else try poly-filling motor mounts?
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Thread: Anyone else try poly-filling motor mounts?

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    Anyone else try poly-filling motor mounts?

    I was looking to stiffen up my mounts a little, and I was a bit surprised by the lack of available engine/trans mounts for these cars. I didn't want to pay $40 for a little plastic bushing, so I decided to fill some factory mounts instead. I was able to get a torque arm and motor mount pretty cheap on ebay (polyurethane fill takes about a week to cure fully and I didn't want my car to be out of commision), and I used loctite pl polyurethane roof and flashing adhesive to fill them. All in all I spent only a bit more than I would have on a torque arm insert, and I've got both mounts done in solid polyurethane.

    I'm really happy with the results. Throttle response feels noticeably more responsive and direct. Shift feel is very positive and the shifter feels way more solid. There is some minor nvh under under 1.5-2k but other than that the car feels nice and smooth, just more connected to the motor (granted I've had poly/solid mounts on previous cars so I'm a bit used to nvh). I daily the car and it's still perfectly comfortable for getting around, but feels noticeably more connected to drive.

    I forgot to take photos while I was doing them, but I've got my stock mounts sitting around so I think I'll fill those and take some pictures of the process along the way. I'll probably be selling those as well if anyone is interested in trying these out.

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    Ando (11-01-2017), Fiat500USA (11-01-2017)

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    Enthusiastically Slow Lifetime Member Ando's Avatar
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    Very cool! Looking forward to the pics and hearing about longevity. Have you used a similar material on your previous cars?

    I am surprised this is the first I have heard of stiffening up the transmission mount. It's a popular opinion that the stock shifter is a bit too sloppy but if you install a short shifter and the cables are still chasing the trans around the engine bay it's a half solution.

    You've got me thinking now... dangerous.

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    Quote Originally Posted by Ando View Post
    Very cool! Looking forward to the pics and hearing about longevity. Have you used a similar material on your previous cars?

    I am surprised this is the first I have heard of stiffening up the transmission mount. It's a popular opinion that the stock shifter is a bit too sloppy but if you install a short shifter and the cables are still chasing the trans around the engine bay it's a half solution.

    You've got me thinking now... dangerous.
    I'm gonna pick up some more sealant and try to get started on those other mounts today so I'll have some pics.

    I havn't used it myself, but I've heard from others that it tends to hold up pretty well. It also really depends on the material. Some poly will dry totally rock solid leading to tons of nvh and a relatively short lifespan as it will start to crack. The stuff I used is roofing sealant which stays semi-rubbery. It's stiff but it's designed to have some flex to account for expanding and shrinking joints so it should hold up well.

    It really helps with the shifter feel. I used to have issues missing third on quick upshifts, now it slots into gear perfectly. I came to the fiat from an s2000, so I'm doing everything I can to sharpen up the controls, I still wish the steering was more direct but I think that's just what you get with eps.

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    Enthusiastically Slow Lifetime Member Ando's Avatar
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    Quote Originally Posted by rocketsausage View Post
    I used to have issues missing third on quick upshifts, now it slots into gear perfectly. I came to the fiat from an s2000, so I'm doing everything I can to sharpen up the controls.
    Are you still on the OEM shifter? The only change I miss is 4th to 5th for freeway passes, but 4th to 3rd occasionally feels goofy, as if the gate isn't even there, just zero resistance.

    If you haven't already you should look into your trans side cable ends. My side to side bushing was barely holding together after 4 winters/35k mi. I used the kit from BushingFix and now have zero play side to side and moderately improved front/rear feel.

    I'm now at 70+ days of waiting for my TWM short shifter to ship, and still very excited to improve shifting feel.

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    Yea, oem shifter with the nue-f short shift adapter. I'll check out the cable ends, the car only has like 4k on it so hopefully they'll hold up for a while, but I'm sure this winter will take it's toll. Are the new ones a more durable/reliable material than the stock ones?

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    Enthusiastically Slow Lifetime Member Ando's Avatar
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    Quote Originally Posted by rocketsausage View Post
    Are the new ones a more durable/reliable material than the stock ones?
    Solid urethane vs linked rubber rings, so yeah, I expect them to weather much better.

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    Quote Originally Posted by Ando View Post
    Solid urethane vs linked rubber rings, so yeah, I expect them to weather much better.
    cool, I'll definitely have to look into those.

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    Mounts cleaned and taped. Before taping they should be sprayed down with brake cleaner or a similar solvent to remove any grime or grease to allow the poly to stick. I just use painters tape which seems to work, but I've heard duct tape mentioned as well. Really I think pretty much anything will work as long as it'll hold up while filling the mounts so the poly takes shape and fills in the gaps properly.
    IMG_20171103_184918.jpgIMG_20171103_184935.jpgIMG_20171103_184947.jpgIMG_20171103_184954.jpgIMG_20171103_185024.jpg

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    The excessive movement is one of the most bothersome things for me on a day to day basis, especially after the flash tune, this is definitely something I've been considering to remedy the issue.

    Rocketsausage, before I pull the trigger on a set of used mounts to modify, what were you thinking of selling your second set for?

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    Senior Member MarcusDubya77's Avatar
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    A write up would be great for this. I really want to try this out. This is awesome.
    2012 Grigio Abarth w/ Red Interior Madness ECM, Madness Go Pedal, TWM Short Shifter, Max Flow Intake, SILA Intercooler, SILA Turbo Blanket, Forge BOV, Forge Waste Gate Actuator, Madness Axle Back Exhaust, H& R Springs, Road Race "Big Red" Anti Sway Bar, Road Race Corsa Chassis Bracing, Stoptech Front and EBC rear Brake Rotors, 16mm Athena Spacers, Madness Mudflaps, "Mad Mouse" Euro Plate

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