50/50 Torque Split Button

[Fassst]

Hey peoples,

Got a question about the 50/50 button in the stag.

When its on, is it normal for the car to "shudder" when accelerating?

For example, Parked on a steep, gravel hill. I push the 50/50 button to try and avoid as much wheel spin as possible.

The car shudders a fair bit as I accelerate. When the 50/50 button is off, the car is fine.

Is this normal? or something I should look into as the car is still under warranty.

BTW Its a S2 Stag.

Thanks

[Ska]

You sure the shuddering is not caused by a tiny bit of wheel spin on the gravel?

When I turn mine on, the rpm drops a tiny bit and I can hear a slight grumbling sound, very faint, you have to turn radio off and no one talk to hear it type faint.

[Stinky Rooster]

when the button is on, the attessa pump should be on fully, so I expect any shuddering is going to be coming from the clutch packs in the transfer case being under full load.

I would get the attessa fluid checked and probably changed as I think this would be a sign of either air in the system or chatter marks on the friction plates. "Chatter" is going to happen to any clutch type system that operates under variable load (as opposed to an on/off situation such as a manual gearbox clutch) so its not something to have a heart attack over, but it is something that should be monitored IMO.

I have only felt shuddering in mine when turning full lock at the same time as accelerating on loose surfaces so wheelspin might be the culprit too.

[Terminal]

I get it bu tonly in reverse with 50/50 turned on. I figure it's just age as my car has done almost 200,000km. The fluid is always full and I've changed it regularly.

[Fassst]

when the button is on, the attessa pump should be on fully, so I expect any shuddering is going to be coming from the clutch packs in the transfer case being under full load.

I would get the attessa fluid checked and probably changed as I think this would be a sign of either air in the system or chatter marks on the friction plates. "Chatter" is going to happen to any clutch type system that operates under variable load (as opposed to an on/off situation such as a manual gearbox clutch) so its not something to have a heart attack over, but it is something that should be monitored IMO.

I have only felt shuddering in mine when turning full lock at the same time as accelerating on loose surfaces so wheelspin might be the culprit too.

thanks all for your replies. I dont think wheel spin is a big factor, as I have experienced this on a sealed surface also (admitedly on a rather steep hill, and in reverse)

Newbie101 - Do you know if checking the Attessa fluid is something that can be do yourself? Or is it something that I need to get the mechanic to do?

Thanks again for all your help.

[Stinky Rooster]

thanks all for your replies. I dont think wheel spin is a big factor, as I have experienced this on a sealed surface also (admitedly on a rather steep hill, and in reverse)

Newbie101 - Do you know if checking the Attessa fluid is something that can be do yourself? Or is it something that I need to get the mechanic to do?

Thanks again for all your help.

Nah - you can check it your self quite easily. Have a look inside the little compartment door on the drivers side just inside the rear door and you will see the attessa resivoir with a level on the side of the "bottle" As with an auto tranny, it is best checked with the car up to temp and standing on a level piece of ground.

If its really low you will need to get the system bled just to be on the safe side. This is probably best left to a mechanic as its a bit of an involved proceedure. Just make sure that whoever does it is aware of the fact that there is 2 bleed points - one at the pump above the rear diff and one at the transfer case at the back. The system is almost identical to the GTR so have a read of the technical section of the forum and you will find out all you need to know.

Good luck with it

[fcruz3r]

when the button is on, the attessa pump should be on fully, so I expect any shuddering is going to be coming from the clutch packs in the transfer case being under full load.

I would get the attessa fluid checked and probably changed as I think this would be a sign of either air in the system or chatter marks on the friction plates. "Chatter" is going to happen to any clutch type system that operates under variable load (as opposed to an on/off situation such as a manual gearbox clutch) so its not something to have a heart attack over, but it is something that should be monitored IMO.

I have only felt shuddering in mine when turning full lock at the same time as accelerating on loose surfaces so wheelspin might be the culprit too.

i have the same thing happening on my car....when turning the steering and stomping on the gas...car shudders and i have to release the gas a bit then floor it again to make the shudder go away....happend occasionally on steep hills too..but other than that gearshifts is silky smooth

[leetom]

i have the same thing happening on my car....when turning the steering and stomping on the gas...car shudders and i have to release the gas a bit then floor it again to make the shudder go away....happend occasionally on steep hills too..but other than that gearshifts is silky smooth

in synchro mode you get what is called tight cornering effect, it is the result of the difference in rotation speed between the front & rear wheels when turning, it happens in most 4wd's in lo range, does cause a bit of a shudder.

[Fassst]

Nah - you can check it your self quite easily. Have a look inside the little compartment door on the drivers side just inside the rear door and you will see the attessa resivoir with a level on the side of the "bottle" As with an auto tranny, it is best checked with the car up to temp and standing on a level piece of ground.

If its really low you will need to get the system bled just to be on the safe side. This is probably best left to a mechanic as its a bit of an involved proceedure. Just make sure that whoever does it is aware of the fact that there is 2 bleed points - one at the pump above the rear diff and one at the transfer case at the back. The system is almost identical to the GTR so have a read of the technical section of the forum and you will find out all you need to know.

Good luck with it

Thanks alot for that. Will have to check it out.

Sorry for late reply, have not been near a computer for a while.

thanks again