LSD bumping

All technical questions and answers regarding starions, being modifications to maintenance.
User avatar
bluestarion
Lil' Dorifto
Posts: 43
Joined: Mon Feb 09, 2004 11:13 pm
Location: Tasmania Hobart
Contact:

Reporting back

Post by bluestarion »

Hi,
It seems the suspension is ok and no obvious issues with bushes.
The axle tramp is intermittant.
Sometimes the LSD appears to be not working i.e.
- one wheel will spin (like a non LSD).
- I will get axle tramp
- LSD operates nicely and the back end slides out :)

Really odd.

Matt
I wonder why I wonder why
I wonder why I wonder
I wonder why I wonder why I wonder why I wonder.
redzone
racking my brains
Posts: 5900
Joined: Thu Oct 06, 2005 10:46 pm
Location: sunshine coast qld
Contact:

Post by redzone »

do you have the correct oil in the diff??
Fibreglass airdams $370, fibreglass front bumpers $260, reco drag links $165, alloy radiators $925 (unpolished), h/l switch rebuilds $125, all plus freight.
Coxs Automotive (07)54433507 3/5 Service st Maroochydore Q

www.facebook.com/coxsautomotive
www.coxsautomotive.com.au
JA83
Mine is bigger than yours
Posts: 291
Joined: Tue Aug 18, 2009 6:11 pm
Location: hobart tasmania

Post by JA83 »

hey mate its lorne with the red staz. another hobart member is trying to organise a cruise on here if your interested?
User avatar
bluestarion
Lil' Dorifto
Posts: 43
Joined: Mon Feb 09, 2004 11:13 pm
Location: Tasmania Hobart
Contact:

Diff oil

Post by bluestarion »

redzone wrote:do you have the correct oil in the diff??
I hope so :)
That would be worth checking and re-doing though.
Any recommendation on a good oil and/or additive?
Matt
I wonder why I wonder why
I wonder why I wonder
I wonder why I wonder why I wonder why I wonder.
redzone
racking my brains
Posts: 5900
Joined: Thu Oct 06, 2005 10:46 pm
Location: sunshine coast qld
Contact:

Post by redzone »

castrol LS90 i think is the original recommendation, any proper LSD oil is the go though.
Fibreglass airdams $370, fibreglass front bumpers $260, reco drag links $165, alloy radiators $925 (unpolished), h/l switch rebuilds $125, all plus freight.
Coxs Automotive (07)54433507 3/5 Service st Maroochydore Q

www.facebook.com/coxsautomotive
www.coxsautomotive.com.au
MrBishi
nearly postwhore
Posts: 1683
Joined: Fri Jan 09, 2004 9:11 am
Location: Seoul

Post by MrBishi »

I still can't see a non-functioning LSD causing axle tramp.
Stranger things have happened though...
4G63 - 87kg
4G54 - 107kg
User avatar
bluestarion
Lil' Dorifto
Posts: 43
Joined: Mon Feb 09, 2004 11:13 pm
Location: Tasmania Hobart
Contact:

axle tramp

Post by bluestarion »

It 'feels' like axle tramp.
One explanation is that under certain conditions an oscillation is setup between the two rear wheels due to the torque transfer in the LSD. The result is and on/off of traction for one of the wheels which feels like axle tramp.
It may be a combo of things (bushes, Konis set to soft and the oil!).
Oil is easy, Konis will be adjusted at next service and bushes well I will have a good look.
Matt
I wonder why I wonder why
I wonder why I wonder
I wonder why I wonder why I wonder why I wonder.
User avatar
VR4RION
[P] Plates
Posts: 35
Joined: Sat Jun 02, 2007 4:02 am
Location: Canberra, NSW

Post by VR4RION »

Have had a similar problem in the past, turned out to be the rear guards bouncing of tyres on take off, soft rear end causing it to bog right down under power. So maybe check for rub lines around the most outer edge of ya rear tyres. Worth a look!, took me a month to finally pick up on it.
Good luck
R.I.P. Australia's first Evo Powered Express, Il never forget the paint you spilt and the smoke you gave in 4th gear!, to think! so many years of wasting HSV's, now you may become one, lets hope they turn you into star-pickets, i know you would rather be drivin into the ground by a hammer, than by a Holden heel'n'toe wannabee. Long live the 4G's!
User avatar
Sargeant_Khan
Enthusiast
Posts: 673
Joined: Thu Dec 16, 2004 9:31 pm
Location: Ipswich

Post by Sargeant_Khan »

Hey man, I have had this happen to me when I have had
Loose torque tube mounts at diff (the looser they get the worse it feels)
Loose diff bolt mount (this is not on and off)
And rear left axle needed recondition. (intermittent)
:beer
Image
PIZZA DELIVERY GUY....No more
User avatar
bluestarion
Lil' Dorifto
Posts: 43
Joined: Mon Feb 09, 2004 11:13 pm
Location: Tasmania Hobart
Contact:

Narrowed down the options

Post by bluestarion »

Well since the last post I have tightend up the diff and torque tube mounts (made a slight improvement), checked and lubricated the rubber bits (actually made it bit quieter) and changed the oil.
Unfortunately it still does it (intermittently).
I am going to change it out for the spare (non-LSD) diff I have to check for sure.
Will update with outcome.
Cheers
Matthew
I wonder why I wonder why
I wonder why I wonder
I wonder why I wonder why I wonder why I wonder.
TOMSUN
Group buy King
Posts: 2391
Joined: Fri Sep 10, 2004 10:24 am
Location: Sydney (Liverpool)

Post by TOMSUN »

My money is on your rear shocks are not quite right.

Are there places you can take your car and the analyse your suspension. Like dyno tuning for shocks? Can they do it wirh the shocks still in the car? Spring rates and shock settings might not be compatible?
1985 JB Starion #157
OLD FART
Austarion Occupant
Posts: 3448
Joined: Sun Jun 19, 2005 1:34 pm
Location: Brisbane

Post by OLD FART »

Fulcrum have a shock dyno but they have to be off the car
Pedders have a gizmo that shakes the carand prints out the result so you can see if both sides are the same
I've had mine since 03 07 92
85 JB 2323cc DOHC 4G63
THE OLDER I GET THE FASTER I WAS
GROWING OLD IS MANDATORY GROWING UP IS OPTIONAL
User avatar
thrash
Austarion Occupant
Posts: 3028
Joined: Mon Apr 02, 2007 10:09 pm
Location: Sydney, Australia

Post by thrash »

would you know how much pedders charge for it? or, what to ask for to get that specific test done?
quest wrote:
WANTSOM wrote:Personally, I find sloppy boxes very unsatisfying. I like them tight and taught to the point that if you dont have to push to get it in then its probably too old and time to get a new one :P
don't try explaining that to her tho..... just leave. lol
OLD FART
Austarion Occupant
Posts: 3448
Joined: Sun Jun 19, 2005 1:34 pm
Location: Brisbane

Post by OLD FART »

thrash wrote:would you know how much pedders charge for it? or, what to ask for to get that specific test done?
I had it done as a part of their $14.00 suspension check a few years ago
I've had mine since 03 07 92
85 JB 2323cc DOHC 4G63
THE OLDER I GET THE FASTER I WAS
GROWING OLD IS MANDATORY GROWING UP IS OPTIONAL
User avatar
bluestarion
Lil' Dorifto
Posts: 43
Joined: Mon Feb 09, 2004 11:13 pm
Location: Tasmania Hobart
Contact:

Aha!

Post by bluestarion »

Alright.
Had the diff swapped out for a non LSD.
Interesting results......
Feels a hell! of alot tighter and is MUCH quieter. Sooooo I reckon the LSD is a bit dodgy and will send it to the hospital for repair.
It still didn't fix the axle tramp but it feels different.
Mechanic reckons it is to do with the valving on the Koni's.
Quite pissed off considering I sent them away for reconditioning specifically to resolve this issue so will see how it pans out.
Spent enough on problem solving now.......
Matt
I wonder why I wonder why
I wonder why I wonder
I wonder why I wonder why I wonder why I wonder.
Post Reply

Who is online

Users browsing this forum: No registered users and 12 guests