1G prothane motor mount inserts bad vibration

[redfield102j]

So i bought and installed a set of prothane inserts for my 91 talon tsi awd 5 speed. My issue is when the car is anywhere over 1200rpm it vibrates the whole car. At idle around 700rpm there seems to be next to no vibration. I am at a lose as to why... has anyone had these issues? Is it normal or should i be worried about something worse being wrong? Any help would be greatly appreciated

 

[Mischif]

Yup that's what happens when you switch from soft rubber to hard urethane mounts. All the vibrations get transferred through the car instead of absorbed by the mounts.

 

[97gsxIA]

My vibrations are much worse at idle than at any other point in the sweep. Double check to make sure your roll stop inserts aren't bound or sitting wrong. Its pretty normal to get your ass vibrating with poly mounts, but they should almost all but disappear after stepping on the go-go pedal.

 

[redfield102j]

The vibrations lessin when stepping on the pedal. And pretty much dissapear at idle. Its the lighter foot driving that is weird and constant speed cruising on highway at 60mph. It kinda feels like driving a truck with a tire rubing. Its weird.

 

[Darksurfr]

Sounds normal to me. There are specific engine RPMs that are going to reverberate the block more then others and transfer to the frame but I wouldn't be alarmed. I have gotten very use to Poly inserts with Balance shafts removed and that is a whole other sort of vibration but still only on a small interval low in the RPM range where you don't ever sit.

 

[Rich94]

Yup, sounds normal. Just double check that all your mounts are torqued and you should be solid.