New After Market Motor Mounts Installed Lots of Vibration Now

[viper04blk]

Perhaps look for a viper-meet in your area and have someone with the same mounts take you for a drive around to compare?

[Mamba003]

Odd. Mine was just as you describe when first installed. After a few months and some breakin, the vibration in between the those RPMs was gone. Do you drive the car hard at all?

[Vprbite]

Well after 7 months the vibration is still very strong and has not subsided. It still only occurs at idle and between 2K and 3K. I try to drive the car in a way to avoid the vibration but that is reducing my enjoyment of the car. Maybe I should put a stock motor mount on the passenger side like stated in a previous post?

Give that a try and report back.

One thing to remember is that "feel" is subjective, like how loud exhaust is. So what may be too much for you might be fine to people who also run super loud exhausts and like a rougher experience. Did it clean up the shifts? If so, then I would think they are installed correctly and doing their job but they are just giving you too much feedback to be enjoyable.

[Item 7]

My Gen IV is currently at Arrow for Stage 2 upgrade and a few other items. This was an issue with the Stage 2 upgrades. It might be less of a concern with unmodified engines.

I had previously purchased the Woodhouse poly mounts (including the transmission mount) - but never installed them. Part of my thinking on the Woodhouse mounts was to avoid maintenance issues reported with older OE Gen IV engine mounts. Since Arrow is removing the motor as part of the Stage 2 project, I discussed the belated installation of the mounts with the good folks at Arrow. Was advised that Dick Winkles, Arrow’s Chief Engineer, had some concerns about using these poly mounts in conjunction with new Stage 2 upgrades to the ECU. Mr. Winkles is concerned the vibrations induced by the poly mounts will cause durability issues with the Throttle Bodies where the engine wire harness plugs directly into the circuit board inside the Throttle Body. The only fix the Viper engineers have come up with is to "Pot" this connection at the Throttle Body, which involves soldering the connections at the Throttle Body with a pig tail of wires and then filling that connection with epoxy to harden the connection or, "Potting the Connection". At the opposite end of the pig tail, a stronger connector to the wiring harness is installed to avoid vibration-induced problems. I decided to follow Arrow's recommendation and spent a few extra dollars to harden the Throttle Body connections to avoid any problems with the Woodhouse mounts.

[GenIIIDave]

Odd. Mine was just as you describe when first installed. After a few months and some breakin, the vibration in between the those RPMs was gone. Do you drive the car hard at all?

I do drive the car hard. Oddly enough, a few days ago I had the Woodhouse trans mount removed and put the original one back in. I left in the Woodhouse motor mounts. Vibrations are now gone.

- - - Updated - - -

Give that a try and report back.

One thing to remember is that "feel" is subjective, like how loud exhaust is. So what may be too much for you might be fine to people who also run super loud exhausts and like a rougher experience. Did it clean up the shifts? If so, then I would think they are installed correctly and doing their job but they are just giving you too much feedback to be enjoyable.

It definitely cleaned up the shifts. No more flopping back and forth shifter.

[BlknBlu]

With the Woodhouse Performance mounts the energy transfer goes away from the shaking engine and transmission into the rest of the car. It is noticeable but not to the extent you are describing. I prefer them over factory, but I just drive around to local events and cruises.

Bruce

[Stealth78]

My Gen IV is currently at Arrow for Stage 2 upgrade and a few other items. This was an issue with the Stage 2 upgrades. It might be less of a concern with unmodified engines.

I had previously purchased the Woodhouse poly mounts (including the transmission mount) - but never installed them. Part of my thinking on the Woodhouse mounts was to avoid maintenance issues reported with older OE Gen IV engine mounts. Since Arrow is removing the motor as part of the Stage 2 project, I discussed the belated installation of the mounts with the good folks at Arrow. Was advised that Dick Winkles, Arrow’s Chief Engineer, had some concerns about using these poly mounts in conjunction with new Stage 2 upgrades to the ECU. Mr. Winkles is concerned the vibrations induced by the poly mounts will cause durability issues with the Throttle Bodies where the engine wire harness plugs directly into the circuit board inside the Throttle Body. The only fix the Viper engineers have come up with is to "Pot" this connection at the Throttle Body, which involves soldering the connections at the Throttle Body with a pig tail of wires and then filling that connection with epoxy to harden the connection or, "Potting the Connection". At the opposite end of the pig tail, a stronger connector to the wiring harness is installed to avoid vibration-induced problems. I decided to follow Arrow's recommendation and spent a few extra dollars to harden the Throttle Body connections to avoid any problems with the Woodhouse mounts.

Well that is mildly concerning. Is there really that much more vibration due to the stage 2 upgrade? I am looking forward to post #9 Sir I think you need to high-bred you name with mine... (Stealth 7) after only posting 8 times in 3 years! Lol!

[Stealth78]

I do drive the car hard. Oddly enough, a few days ago I had the Woodhouse trans mount removed and put the original one back in. I left in the Woodhouse motor mounts. Vibrations are now gone.

- - - Updated - - -



It definitely cleaned up the shifts. No more flopping back and forth shifter.

This is great information as I have had my mounts sitting in the package for quite some time. Maybe I will try the motor mounts and not the trans mount, although it kind of sucks that I already bought the damn thing.

[Angleiron]

When I had the mounts changed on my Gen II to poly (both engine and trans) it vibrated badly and made shifting a pain. As soon as I removed the poly trans mount the vibration went away and it shifted like stock again.