Jump to content


Photo

Transmission mount NVH


  • Please log in to reply
15 replies to this topic

#1 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 21 April 2015 - 05:23 PM

Yesterday I installed my RalliTEK transmission mount bush for the 4EAT.

0bc6200dbfbba4d0f986eb0d7e015e19.jpg

I was aware that there would be an increase in NVH.

I re-used my current header gaskets as I had to remove my headers and cats to access the required nuts/bolts.

Upon start-up I noticed there was more noise, especially boxer rumble, and a slight burning smell and hissing in the engine bay, something that I have attributed to as failed gaskets, even though they were torqued down correctly. I have already sourced some replacement gaskets.

The NVH imo is borderline unbearable.

Have any of you experienced something similar with installation of a Group N tranny mount?

I have Group N pitch stop mount already in my car and I have engine mounts to put in too.

Do you think the bush has affected the tailshaft in relation to the transmission box?

The driveline doesn't feel stiffer, but this may be because of the header gasket leak.

Cheers.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread


#2 CRUISN

CRUISN

    Doin it my way.

  • Members
  • PipPipPip
  • 6,970 posts
  • Gender:Male
  • Location:Melbourne
  • Interests:Family, Surfing, Cars.

Posted 21 April 2015 - 05:55 PM

I know of another member who fitted the rallitek race spec bush and removed it as NVH was majorly increased.

OEM+


#3 duncanm

duncanm

    wha' who ?

  • Members
  • PipPipPip
  • 2,000 posts
  • Gender:Male
  • Location:Sydney

Posted 21 April 2015 - 06:08 PM

is that a big lump of poly in the middle?  No wonder they increase NVH.

 

The group N mounts are still rubber -- just without compliance gaps like the std mounts.

 

Is this the install process - shove Rallitek block of poly into std mount ?

 http://legacygt.com/...82.html?t=45482

 

If so - try filling the mount with sika 255 instead.



#4 nickknack

nickknack

    Regular Member

  • Members
  • PipPipPip
  • 2,619 posts
  • Gender:Male
  • Location:VoD

Posted 21 April 2015 - 06:16 PM

I have a group N tranny mount, but its on a manual. NVH increase was noticeable but not major, and really only when punching it. Changing gears definitely feels better though



#5 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 21 April 2015 - 06:18 PM

Well the Group N transmission mount only suits the 5MT box so that's why I had to use RalliTEK.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread


#6 Andyjs2

Andyjs2

    Trusted Member

  • Members
  • PipPip
  • 198 posts
  • Gender:Male
  • Location:Newcastle

Posted 21 April 2015 - 06:42 PM

I changed the lower shift bushes and the 'positive shift kit'... took them out a couple of weeks later because of the noise, way to annoying to drive to and from work everyday, decided I'm not changing anymore bushes or adding the anti-lift kit I had planned

#7 Jimbo

Jimbo

    Livin' the Legacy

  • Members
  • PipPipPip
  • 2,771 posts
  • Gender:Male
  • Location:B'town

Posted 21 April 2015 - 07:11 PM

Has anyone heard any feedback about the soft version? I have one sitting here I haven't put in, wondering now if it's worth it?

Mark, did you get yours in?


'04 Liberty GT Premium "The Sprog Chariot"


#8 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 21 April 2015 - 07:13 PM

Mark sold his to Chris - Absolution.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread


#9 crjohnson

crjohnson

    Trusted Member

  • Members
  • PipPip
  • 201 posts

Posted 21 April 2015 - 08:42 PM

Does that sikaflex 255 go hard or stay a bit soft like butylmastic sealer stuff?



#10 duncanm

duncanm

    wha' who ?

  • Members
  • PipPipPip
  • 2,000 posts
  • Gender:Male
  • Location:Sydney

Posted 21 April 2015 - 09:35 PM

It stays pretty rubbery.. datasheet says Shore A hardness of ~60, which is approaching tyre-tread type material.



#11 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 22 April 2015 - 12:18 AM

I changed the lower shift bushes and the 'positive shift kit'... took them out a couple of weeks later because of the noise, way to annoying to drive to and from work everyday, decided I'm not changing anymore bushes or adding the anti-lift kit I had planned

Still do the ALK, it's great and next to no NVH, except for Harshness only, from the front end being more stiff.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread


#12 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 22 April 2015 - 12:20 AM

It turns out I inserted the mount the opposite way, so while I'm replacing the header gaskets I'll re-position the mount and see how the NVH is afterwards.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread


#13 Andyjs2

Andyjs2

    Trusted Member

  • Members
  • PipPip
  • 198 posts
  • Gender:Male
  • Location:Newcastle

Posted 22 April 2015 - 05:31 AM

Still do the ALK, it's great and next to no NVH, except for Harshness only, from the front end being more stiff.

I see, I shall look into it again :)

Have you done it?

#14 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 22 April 2015 - 08:15 AM

I see, I shall look into it again :)

Have you done it?

Sure have :)
I rate it above a rear swaybar.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread


#15 Andyjs2

Andyjs2

    Trusted Member

  • Members
  • PipPip
  • 198 posts
  • Gender:Male
  • Location:Newcastle

Posted 22 April 2015 - 09:12 AM

Ah awesome :D

Thanks, I had it totally crossed off my list because I read it makes a fair bit of noise

#16 SSIKness666

SSIKness666

    Regular Member

  • Members
  • PipPipPip
  • 499 posts
  • Gender:Male
  • Location:Modbury, SA
  • Interests:Scuba Diving
    Downhill MTB riding
    Bicycles
    Photography
    Cars
    Aquariums
    Anything to do with the Ocean eg. old Maritime history

Posted 23 April 2015 - 06:56 PM

Ok so tomorrow I will replace my header gaskets and correctly position my transmission mount.
What I want to know is are there any benefits of my mount bush cuz I don't want to waste my time and gaskets only to realise the NVH is unbearable and the benefits (if any) are negligible, in which case I'll remove the RalliTEK bush.

I remember Cam saying in my build that pitch stop, transmission and engine mounts are some of the best mods you can do.

I have STi engine mounts to go in too so is everything worth it, especially the engine mounts?

Cheers.

Old Chinese Proverb: Experience should fear the strength of Youth

 

eVp photography

Gen 3 build thread





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users