Nissan Skyline GT-R R32 TC Differential

A couple of days ago I decided to find a nice car to do the 4 hours of the Ring with. One of the cars I tested was the Nissan Skyline GT-R R32 TC. After doing one lap of the Nürburgring type V in practice mode (with tyre and fuel on) I noticed that my front tyres where taking quite a bit of damage, while the rear tyres were barely hot.
Besides that the car was giving me quite a bit of oversteer when I used it on the TT earlier.

Confused about this I looked at the Standard Diff and found it was set to 150 front and -50 rear (!?). A custom diff would default to 65/35.
I have no clue what I am looking at.

65/35 are percentages. I get that, change one and the other changes accordingly.
But the 150/-50 values are hocus pocus to me.

Does anyone know what the values mean?

edit: And would anyone know why this car is set up to be more FF than anything else? Is it a tuning 'trick' to correct possible oversteer without having to go through the suspension settings?

What it means is that the front is being given 150% of the power and the rear is getting -50%

This would equal 100% So mathematically it makes sense.

What I think is happening here is that the rear is being under-driven, this is where the rear diff has a higher gear ratio than the front, meaning the rear wheels are being dragged along. This is used in my hobby of scale 4x4 RC to allow for a greater turning radius when both diffs are locked, and in RC drifting it is not uncommon to find over-driven cars (where the rear spins faster than the front) in order to create a car that requires more counter steer than the conventional RC drifter. (This is used so that in pictures and videos it looks like the cars are RWD when in fact they are 4WD with a 50/50 torque split, because a RWD RC car is incredibly difficult to drift.

That's my thoughts on this, other than that I have no explanation of this.. it's mind-boggling.

I've noticed this as well. My only guess is that GT tries to emulate the factory ATTESA AWD system which varies the front/rear split based on conditions, and for some reason it spits out these goofy numbers.

sk8tepenguin

What it means is that the front is being given 150% of the power and the rear is getting -50%

This would equal 100% So mathematically it makes sense.

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I thought about this too. It only makes sense mathematically though. Physically it is rather strange.
+50/-50 would make more sense, although it would be better to just call it 75/25 then.

sk8tepenguin

What I think is happening here is that the rear is being under-driven, this is where the rear diff has a higher gear ratio than the front, meaning the rear wheels are being dragged along. This is used in my hobby of scale 4x4 RC to allow for a greater turning radius when both diffs are locked, and in RC drifting it is not uncommon to find over-driven cars (where the rear spins faster than the front) in order to create a car that requires more counter steer than the conventional RC drifter. (This is used so that in pictures and videos it looks like the cars are RWD when in fact they are 4WD with a 50/50 torque split, because a RWD RC car is incredibly difficult to drift.

That's my thoughts on this, other than that I have no explanation of this.. it's mind-boggling.

Click to expand...

Wouldn't this mean that the rear wheels wear out faster than the front though?

oppositelock

I've noticed this as well. My only guess is that GT tries to emulate the factory ATTESA AWD system which varies the front/rear split based on conditions, and for some reason it spits out these goofy numbers.

Click to expand...

Could be. I am not that familiar with AWD systems.
However, I don't have that many Skylines or GT-Rs, but I couldn't find any of these numbers on other 4WD Nissans. All others have a distribution favoring the rear wheels (20/80, 30/70).
So besides the weird numbers it is (likely) also the only 4WD Nissan in which the diff favors the front.
I call big bug!

Surely if it's -50% of the power, then the rear wheel should be in reverse :S

Maybe its the reverse suspension settings bug!

NFSCARBON1

Surely if it's -50% of the power, then the rear wheel should be in reverse :S

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Or the rear wheels generate their own power and give some back to the engine.