Axle Tramp In R32 Gtst

[Rekin]

Hey,

Have had a problem with axle tramp with my car and been trying to fix it but having no luck.

What ive done so far;

- SuperPro SPF2687K RR cross member insert enhancement mount (had to drop whole subframe to install etc)

Still had axle tramp, so put in new suspension;

- Bilstein shocks w/ kingsprings; set at 340mm on rear

Still have axle tramp

Does anyone know whats causing the problem?

Any help would be greatly appreciated!

Thanks

[2LV8ETR]

What sort of tyres are you running, and at what pressure?

[Rekin]

Bridgestone potenza gIII, close to replacing.

Pressure; 38psi

cheers

[DAS KAMU]

i had it bad before i replaced my worn out shocks ages ago

then it was good

wonder whats up with yours?

[Rekin]

i had it bad before i replaced my worn out shocks ages ago

then it was good

wonder whats up with yours?

yeah i thought it was my old suspension too, hence pushed me into upgrading

too bad it didnt fix the axle tramp

[DAS KAMU]

subframe bolted in tight etc?

[nisskid]

those GIII's arent the same ones i had on when i sold them to u are they? (think thats what i had on)

[nisskid]

btw

10% of the time it’s tyre pressures, the sidewall flexes and releases. Try pumping the tyres up and see if the axle tramp stops and/or gets less.

5% of the time it’s worn subframe bushes, since you have fitted a rear subframe alignment kit (pineapples) I suspect that isn’t the problem in your case.

25% of the time its drive shaft angle, the car is TOO LOW and the angle of the universal joints are winding up the drive shafts. If your car is lower than 345 mm centre of wheel to guard on the rear, then try raising it up.

60% of the time it’s incorrectly matched spring and shock damper rates. The rebound (extension) damping is not sufficient to control the oscillations of the springs. Standard springs with worn shocks get this problem. BRAND NEW aftermarket coil overs get this problem where the spring rate is too high for the shocks to control.

Once you have eliminated 1, 2 and 3, then your problem is #4

cheers

[bubba]

More revs before you drop the clutch..

[blind_elk]

So you've got a mate who has seen the rear axles tramping?

Rather than dumping the clutch, have you tried feeding the power ie slightest clutch slip?

[Rekin]

those GIII's arent the same ones i had on when i sold them to u are they? (think thats what i had on)

yeah they the same tyres, they just reached the indicators.

10% of the time it’s tyre pressures, the sidewall flexes and releases. Try pumping the tyres up and see if the axle tramp stops and/or gets less.

5% of the time it’s worn subframe bushes, since you have fitted a rear subframe alignment kit (pineapples) I suspect that isn’t the problem in your case.

25% of the time its drive shaft angle, the car is TOO LOW and the angle of the universal joints are winding up the drive shafts. If your car is lower than 345 mm centre of wheel to guard on the rear, then try raising it up.

60% of the time it’s incorrectly matched spring and shock damper rates. The rebound (extension) damping is not sufficient to control the oscillations of the springs. Standard springs with worn shocks get this problem. BRAND NEW aftermarket coil overs get this problem where the spring rate is too high for the shocks to control.

Once you have eliminated 1, 2 and 3, then your problem is #4

Ive eliminated those 4 options! where is option 5!! (apart from car sitting atm at 340mm instead of 345mm, i doubt 5mm would make it magically disappear...)

Bilstein shocks and springs were supplied as package from suspension place, so they matched perfectly.

So you've got a mate who has seen the rear axles tramping?

Rather than dumping the clutch, have you tried feeding the power ie slightest clutch slip?

Havent got a person to see it, but i definitely feel it when driving. Loud banging in the rear and the gear shifter going nuts haha

I guess ill see if the problem goes away with new tyres, but just wanted to make sure that is the problem...

Thanks

[blind_elk]

Axle tramp rarely happens while you are driving along. Might I suggest that it could be something in the drive shaft, maybe the centre bearing packing up.

[Rekin]

Axle tramp rarely happens while you are driving along. Might I suggest that it could be something in the drive shaft, maybe the centre bearing packing up.

By driving i meant launching in first gear, sorry for the confusion. Was indicating that ive only felt it and havent had a friend spot it from outside the car.

[blind_elk]

I suggest you get someone to watch what happens. I find it difficult to believe that brand new Bilsteins and Kings springs can't control the rear axles.

[nisskid]

yeah they the same tyres, they just reached the indicators.

haha wow

Ive eliminated those 4 options! where is option 5!! (apart from car sitting atm at 340mm instead of 345mm, i doubt 5mm would make it magically disappear...)

Bilstein shocks and springs were supplied as package from suspension place, so they matched perfectly.

have u tried putting ur pressure up to say 50psi? also the only real way to eliminate all the options is to put the height up to around 350, but yeh i doubt that's it, probably not worth the trouble of lifting the car.

with ur subframe bushes, did u install them urself?

[Rekin]

haha wow

have u tried putting ur pressure up to say 50psi? also the only real way to eliminate all the options is to put the height up to around 350, but yeh i doubt that's it, probably not worth the trouble of lifting the car.

with ur subframe bushes, did u install them urself?

haha the tyres have served me well, its not like i wear em out cause any sign of traction loss is painful to the car lol

nah i got traction tyres to install them (http://www.tractiontyres.com.au )

Tried to get them to have a look at it, but roads were too wet.

[nisskid]

the only thing id say is i have heard of some rare cases of them installing the pineapples in with the old bushes, dunno how the hell u do that lol, but that's all i can think of there.

[thrtytwo]

yeh i had terrible axle tramp, would get it taking off in first or just going round corners/round abouts at speed, pineapples didnt work so i got coilovers, no problems since, well, still slight hint at hard launch in first, but still got subframe bushes waiting to go in so should eliminate all together, then my car might be too low, anyways its easy to put up with now

coilovers ftw

[nisskid]

yeh i had terrible axle tramp, would get it taking off in first or just going round corners/round abouts at speed, pineapples didnt work so i got coilovers, no problems since, well, still slight hint at hard launch in first, but still got subframe bushes waiting to go in so should eliminate all together, then my car might be too low, anyways its easy to put up with now

coilovers ftw

coilovers come standard in skylines, so a bit more info into what the coilovers actually are might help lol

[Rekin]

hrmm would anyone else have any ideas? Just want to confirm if the subframe kit i put in would stop axle tramp?