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Location:
Montrose, VIC
Registered:
May 2002
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Axle Tramp
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Mon, 19 May 2003 10:13
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Anyone got some suggestions for lessening axle tramp? On my turbo AE86 it can get quite severe when launched hard. It can be lessened by carrying Yogorilla in the back seat, but he tends to get an upset stomach with my driving  Anyway, the shocks are fine (koni yellows), everythings done up, all the bushes are good, etc. Any suggestions? (Apart from installing drag shocks - I DO actually like to go around corners!)
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Location:
Sydney
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 04:56
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Hey mrshin,
Unfortunately i cant offer you a solution, but I've got the same problem. And funnily enough i'm running the same diff and gearbox. Except i have a two piece tail shaft.
Its really frustrating when your trying to get a decent launch. As soon as you get a bit of wheelspin the diff trys to remove itself from the car rather violently. Wet weather only compounds the problem for me.
One thing i have been told to try is to increase the pinion angle of the diff. I.e. rotate the nose of the diff down. This can be done by getting adjustable upper arms and shortening them. Whiteline sell these for about $230.
I havent got a set of these yet as my moneys going elsewhere. I have slotted the holes on the lower arm mounts on the diff. This gave me a bit more anlge but the tramp is still there. I was going to slot the upper arm holes when i get a chance and see if that helps.
The only other thing i need to do is to replace the bushes.
The only thing i can really put it down to is that the diff shop has stuffed the alignment of the brackets when they swapped them from the original diff.
If you or anyone else gets any ideas please let me know.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 05:28
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Yeah, anything else you find out would be nice  I'll put it to some of my old school drag racing buddies when next I see them, see if they can come with a a solution more appealing than ladder bars
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 05:30
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Oh yeah, and the annoying thing is that it's been getting worse over the last few weeks - I've taken to diff out (I was replacing the LSD) and checked all the bushes, bolts, bodywork, etc., and can't see anything busted. Annoying thing is that the diff has rubbed a hole in my exhaust - a 3" pipe has minimal clearance at any time, and such un-gentleman like movement of the diff sure doesn't do it any favours...
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Location:
Sydney
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 05:33
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Yeah mine rubs on my 2.5 inch exhaust. I also think the tramp was partly responsible for braking one of my shocks.
What lsd have you put in yours? I've got the standard skyline setup and its pretty much wearing out after only about 6 months.
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Location:
MACKAY
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 10:35
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What tyre pressure are you running , Try dropping the pressure a bit .
Trevor
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 10:58
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I'm using a KAAZ LSD in the skyline case - working great. Bloody pricey though! If you got 6 months out of the cone type one, you must be treading lightly Mine died after about 6 days...
I've already tried playing with pressures, doesn't do much 
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Location:
MACKAY
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 12:18
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I've had a lot of this trouble in the past in various cars and the best thing that I found that works is replacing the standard bushes with urethane bushes 99% of the time this will work straight up even with crappy springs and shocks.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 12:21
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Bushes are already all urethane, shocks are Koni and still working fine
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Location:
MACKAY
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 12:29
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Sorry mate I have got no idea then. 
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 12:31
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Get a new car, that will fix it
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 12:42
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Can't I kill this one first??? 
Yes, yes, one day...
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Location:
Newcastle
Registered:
May 2002
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Re: Axle Tramp
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Tue, 20 May 2003 21:25
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g'day...
i have a celica with a 1ggte and a volvo diff...
had heaps of probs with tails shaft hitting floor and other fucking round....
a mate with a workshop (JT performance in newcastle)made me up a set off adjustable upper control rods and now she is sweet as!!
At dubbo i launched with everything i had and no issues at all.
I think he was looking at doing them for around $250 with a complete urathane bush kit (worth bout $125).
if you are interested let me know.
Cheers
Stew
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Location:
launceston
Registered:
May 2003
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Re: Axle Tramp
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Wed, 21 May 2003 09:44
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urathane bushes can some times cause the rear end to be two stiff causing axle tramp i had the same problem with my ra40 with 1ggte and i have been tolt to put standard bushes back in the top arms only to allow them to move a bit. i havent tried it yet but they seemed very confident that, that was the problem, its worth a try and its cheep
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Location:
Sydney
Registered:
May 2002
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Re: Axle Tramp
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Wed, 21 May 2003 10:03
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what about firmness of suspension(springs and shocks) I put new springs and shocks in the rear of my 28 and it solved my axle tramping problems.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Wed, 21 May 2003 13:04
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I've already got fairly stiff springs, shocks and bushes, and these may be making the issue worse... but still
TOY77, if you can put me onto some decent adjustable arms, by all means do so Also, you dont happen to drive a red RA28, do you?
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Location:
Sydney
Registered:
May 2002
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Re: Axle Tramp
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Wed, 21 May 2003 13:04
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yeah my new stuff is softer.
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Wed, 21 May 2003 23:01
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I've already got the adjustable panhard bar - the thing that annoys me is that this problem has only recently surfaced, a couple of weeks before I took my diff out. As I said, I checked out everything while it was out, found nothing up, but I will definately look into the adjustable upper arms.
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Location:
Eskilstuna, Sweden
Registered:
May 2002
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Location:
Shepparton
Registered:
October 2002
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Re: Axle Tramp
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Thu, 22 May 2003 12:35
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One solution i have heard of is to get a shortish shock absorber and weld a mount somewhere to the snout of the diff at one side and the other mount through the floor. works (obviously) by absorbing the forces of the torque effect(when the diff snout goes upwards under acellaration)and where tramping it is going up and down really quick... dont get too stiff a shock though cos it will then try to flex elsewhere(control arms etc),
drastic i know but you know what they say about desperate times.
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Location:
tallahassee FL usOFa
Registered:
May 2002
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Re: Axle Tramp
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Thu, 22 May 2003 17:04
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soft motor & trans mounts also contribute to this. the entire drivetrain is twisting up and then releasing this energy, not just the rear suspension.
i think the pinion angle is only important for u-joint wear, but it does add to this problem by "pulsing" the power flow and possibly adding to the problem.
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Location:
Newcastle
Registered:
May 2002
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Re: Axle Tramp
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Thu, 22 May 2003 21:25
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g'day.
well they did work on mine....
the price above is what he said he can do...
i can get his number for you if you like?
My ra28 is wrx rally blue...
Stew
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Axle Tramp
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Thu, 22 May 2003 23:32
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Yeah his number would be nice
Good guess that you had an RA28 ey? although I thought you were someone else!
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Location:
Sydney
Registered:
May 2002
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Re: Axle Tramp
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Thu, 22 May 2003 23:35
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I know whiteline make adjustable upper arms. Dont know what they are like tho. They were about $250 or so. I think they came with bushes. I will buy a set eventually.
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Location:
Mentone
Registered:
May 2002
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Re: Axle Tramp
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Fri, 23 May 2003 00:02
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Like Youngy said you have changed the angle of the control arms which changes the roll centre and the twist centre. If you lower the rear of the bottom arms to the angle of the original height it will help alot. It is similar to lowering a car and not using rca on the front. You are messing up all the factory angles. If your Koni's are adjustable try running softer settings.
Brad
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Location:
Brisbane / Gold Coast
Registered:
May 2002
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Re: Axle Tramp
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Fri, 23 May 2003 00:28
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Rose joint the lower arms and the upper-right. Leave the rubber bushes in the upper-left.
That's called 'three and a half linking' the rear end, and the car will not axle tramp after that.
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