Perth-WRX.com  

Go Back   Perth-WRX.com > Technical > Mechanicals
Register Diddy Kart ArticlesAll AlbumsBlogs FAQ Community Calendar Today's Posts Search


Welcome to Perth-WRX, click here to register!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 25-02-2009, 05:39 PM
Serbaru's Avatar
STI Master
Member
 
Join Date: Nov 2008
Location: PERTH
Posts: 745
Thanks: 5
Thanked 6 Times in 6 Posts
Serbaru at standard level
Default 4th Gear crunching?

Hey guys just havnt got a chance to ask about it...but i have been hearing crunching when changing into 4th gear when on boost from 3rd and sometimes when dropping down from 6th gear going around 110 and dropping to 4th makes a crunch.

Would would the sound of that be? hope its not major.
Possible ideas i gather would be gearbox oils?

car is an 05 sti
__________________
[ESTEYE]
Reply With Quote
  #2  
Old 25-02-2009, 06:20 PM
Scoobie Noobie
Member
 
Join Date: Nov 2005
Location: Perth
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Madmaxxx6 at standard level
Default

I'm the same, my car crunches going from 2nd to 3rd, and sometimes also crunches going from 4th to 5th.

I'm thinking it could be the synchro? Any ideas anyone?

I have also been recommended by a few people to switch over to Redline Synthetic oil to see if that makes a difference. I just haven't found the time
Reply With Quote
  #3  
Old 25-02-2009, 06:21 PM
blue.spec's Avatar
Banned
 
Join Date: Jul 2008
Location: Perth
Posts: 800
Thanks: 0
Thanked 0 Times in 0 Posts
blue.spec at standard level
Default

maybe because your at the drags every wednesday night??
Reply With Quote
  #4  
Old 25-02-2009, 06:42 PM
MKVIGTI's Avatar
Subaru Tech Division
Member
 
Join Date: Nov 2006
Location: Perth Burbs
Posts: 1,660
Thanks: 0
Thanked 0 Times in 0 Posts
MKVIGTI at standard level
Default

Silly question but do you have the clutch all the way down at the point where 4th gear is engaging. Can do 3rd to 4th very quickly and will usually slip in if you miss time it a little. Getting 1st 2nd or 3rd is harder so you instinctively take a little more care.

Do it occasionally myself.

If gearbox oil is getting a little old and you give it a hammering it would be a good thing to do anyway. The 2 times I have changed mine it shifted really smoothly for a couple of thousand km before slowly getting a little notchy again.
__________________
Stoner & Webber 2011 World Champions
Reply With Quote
  #5  
Old 25-02-2009, 06:53 PM
munya's Avatar
Sign me up!
bug love
 
Join Date: Dec 2007
Location: In a donga
Posts: 1,652
Thanks: 64
Thanked 17 Times in 16 Posts
munya at standard level
Send a message via MSN to munya Send a message via Skype™ to munya
Default

Quote:
Originally Posted by Serbaru
Hey guys just havnt got a chance to ask about it...but i have been hearing crunching when changing into 4th gear when on boost from 3rd and sometimes when dropping down from 6th gear going around 110 and dropping to 4th makes a crunch.

Would would the sound of that be? hope its not major.
Possible ideas i gather would be gearbox oils?

car is an 05 sti
have the same problem when shifting from 3rd to 4th have a temp fix for it on my car changed the gear oil to Redline Lightweight Shockproof Gear Oil till i get the syncro's fixed later
__________________
race tape y pipe running .05 bar till spares turn up.
Reply With Quote
  #6  
Old 25-02-2009, 07:41 PM
berrjona's Avatar
DCCD Donut Driver
Member
 
Join Date: Sep 2007
Location: WELLARD
Posts: 88
Thanks: 0
Thanked 1 Time in 1 Post
berrjona at standard level
Send a message via MSN to berrjona
Default

had the same when first got the car... took back to subaru and they had to change the synchro and something else out inside the gearbox..... thankyou warranty!!!
Reply With Quote
  #7  
Old 25-02-2009, 08:09 PM
Scoobie Noobie
Member
 
Join Date: Nov 2005
Location: Perth
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Madmaxxx6 at standard level
Default

Quote:
Originally Posted by blue.spec
maybe because your at the drags every wednesday night??
Never dragged the car. I have had the car for roughly 2yrs now, it's kinda had that issue since I got it. The problem is on and off, sometimes it happens sometimes it doesn't.

Car went in to Subaru last week for a service, they said the gears didn't crunch when they checked, I drive it home and it crunches. I will be taking it back soon. They don't want to fix or even look at the synchro, because they can't "hear nothing". I could rant all day about said company's dealer servicing, but lets not go there.

How much does a new synchro cost?? However, in saying that my car is still under factory warranty.
Reply With Quote
  #8  
Old 25-02-2009, 08:27 PM
Kato's Avatar
Burnout!
Member
 
Join Date: Jul 2005
Location: Pimp Corner
Posts: 7,079
Thanks: 7
Thanked 120 Times in 75 Posts
Kato is a guruKato is a guru
Default

If its a synchro on the way out, get it fixed under warranty.

Also are you shifting slowly or buzzing it through the box? Had the gearbox oil replaced recently?
__________________
[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]
Reply With Quote
  #9  
Old 25-02-2009, 08:27 PM
tropikal's Avatar
Sir AntiLag
Member
 
Join Date: Apr 2007
Location: perth
Posts: 359
Thanks: 0
Thanked 0 Times in 0 Posts
tropikal at standard level
Default

Sounds like your Synchros are wearing.. chuck sum lightwieght shockproof (blue liquid) stuff in your box .. it fixed my crunching.. =)... If u wana get ur synchros changed it costs you the labour of pulling apart the box and putting back in!.. mite aswell replace anything else damaged while its out and opened! Im suprised its a 6 sp STI box and its having these probs.
Reply With Quote
  #10  
Old 25-02-2009, 09:49 PM
agentorange's Avatar
STI Master
Member
 
Join Date: Mar 2006
Location: Perth
Posts: 712
Thanks: 0
Thanked 0 Times in 0 Posts
agentorange at standard level
Default

Quote:
Originally Posted by tropikal
Sounds like your Synchros are wearing.. chuck sum lightwieght shockproof (blue liquid) stuff in your box .. it fixed my crunching.. =)... If u wana get ur synchros changed it costs you the labour of pulling apart the box and putting back in!.. mite aswell replace anything else damaged while its out and opened! Im suprised its a 6 sp STI box and its having these probs.
Agreed! first, second or third, yeha maybe, but they're tripple synchro or something anyhow...and on a STi 6MT...and 246hp is not exactly massive numbers...

EDIT: 13.0@104...flat shifting?
__________________
...He said Smooth Bee the skins is fat
I don't beg cause I'm not in begonia
I dress warm so that I won't catch pneumonia
My rhymes are stronger than ammonia
I'm a diamond, you're a cubic zirconia

Last edited by agentorange; 25-02-2009 at 09:52 PM.
Reply With Quote
Reply

Tags
4th, crunching, gear


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://www.perth-wrx.com/vb/mechanicals/25111-4th-gear-crunching.html
Posted By For Type Date
My03 Sti 6 Speed Gearbox - Rexnet Subaru Forums This thread Refback 02-05-2011 04:28 PM



Welcome to Perth-WRX, click here to register!

All times are GMT +8. The time now is 07:02 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO