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axle tramp
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Mon, 15 September 2003 13:19
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Does anyone have any tips for reducing axle tramp in my jza70?
Before i changed clutch to this sprung button unit axle tramp did not exist. Now it is hard to drive in traffic without it !!!
It seems to start a little clutch shudder and then the axletramp starts.
Any ideas ?
Cani fix/adjust/replace anything to reduce it ?
The only way to get off thelien without major trouble is to instantly light the rears 
not good for racing.
Matt
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I supported Toymods
Location:
Epping, Sydney
Registered:
May 2002
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Re: axle tramp
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Mon, 15 September 2003 13:23
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tighter rear springs!
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Re: axle tramp
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Mon, 15 September 2003 13:27
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dont know if that would help.
when adjusted to its hardest setting the shocks make it very hard already.
I went looking for worn bushes in the rear but it is all good.
I suspect this has something to do with my las blown diff as it had a big shudder and went BANG.
Matt
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: axle tramp
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Mon, 15 September 2003 23:17
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Shocks control the movement.
Springs prevent the movement.
It's worth a try.
What springs do you have in there?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: axle tramp
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Mon, 15 September 2003 23:52
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Maybe if you stop dropping the clutch at 7500+rpm the axle tramp will lessen  Sure it's tramp, not some kind of nasty vibration?
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Re: axle tramp
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Tue, 16 September 2003 07:41
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It has KYB adjustable shocks in reasonable condition. Not sure of what springs are in it. It is very low. Like said it wasnt such a problem till I changed clutches.
Someone said to me the other day it was my hard worn out tyres ???
anyone else think this might be the case ?
It doesnt seem to tramp when i do flog the crap out of it, it is usually started when my clutch gives a little shudder wehn trying to slip it a little for a fast launch.
So it is launches in the 3000-4000 with a small slip that give me the most trouble.
Matt
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Location:
Melbourne
Registered:
May 2002
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Re: axle tramp
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Tue, 16 September 2003 10:52
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If its very low it maybe squating onto the bump stops/stops in the shockers?
Allan
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Location:
Madrid - Spain
Registered:
August 2002
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Re: axle tramp
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Wed, 17 September 2003 03:23
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I think your car has a semi trailing arm hasn't it??
If it has been lowered, you have changed your thrust line, causing more energy to be put into the springs during the launch. I bet your car squats then you launch it hard.
Are you sure it is not a problem with the clutch?
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Location:
Brisbane
Registered:
May 2002
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Re: axle tramp
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Wed, 17 September 2003 04:36
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Double wishbone IRS, not trailing arm.
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Re: axle tramp
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Wed, 17 September 2003 06:58
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It still squats hard on a launch.
I am investigating my clutch atm, I think even for its extreme specs it shudders too much.
Matt
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Location:
Madrid - Spain
Registered:
August 2002
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Re: axle tramp
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Wed, 17 September 2003 21:44
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If it is squatting hard, it sounds like too much energy is being put into the suspension. With a clutch like that it pits a lot of shock type load on the whole drive train. The energy has to go somewhere and it looks like too much of it is going into pushing the bum of your car down and not enough pushing it forward.
Double wishbone setups are difficult to modify, so I would look first at tightening up all the pivot points, make sure the bushes are not deteriarated. You could even look at replacing them for something harder, however this detract from ride quality.
Short of that look at using stiffer shocks. You said you shocks were adjustable, is it just for rebound or bump as well? I guess you would want them hard on bump and softer on rebound.
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I supported Toymods
Location:
Northern Beaches
Registered:
May 2002
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Re: axle tramp
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Wed, 17 September 2003 21:50
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from what I have heard the more extreme your clutch ie. less pucks and higher clamping pressure = more shudder when being slipped, due to the clutch gripping then breaking then gripping again. The less pucks on the clutch and the more clamping pressure causes this more because it can't slip.
With my brass button if I get things wrong with the accel and clutch it shudders like a bitch.
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