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SKYLAB FUSION

What is the SKYLAB FUSION?

The FUSION is the latest Electronic Torque Split Controller from SKYLAB. It***8217;s specifically designed for use with the Nissan Skyline/Stagea with manual transmission and the ATTESA E-TS 4WD system.

Incorporating the latest technology in accelerometers and programmable electronics to give you the ability to fine tune your cars handling. FUSION Replaces the existing G Sensor unit completely and offers the driver an improvement in cornering and straight line traction.

What does the E-TS do?​

Nissan***8217;s Electronic Torque Split (E-TS)

Based on a rear-drive layout, this 4WD system employs sophisticated electronic control to vary torque split to the front wheels, resulting in both excellent handling and stability.
During cornering, a rear-drive car allows positive control over the vehicle through accelerator input and also provides responsive steering without understeer, but trying to accelerate whilst cornering at a speed beyond an RWD car***8217;s limit may lead to a spin.
This happens because the lateral G generated by turning, together with the torque applied to the rear wheels to accelerate the car exceeds the tires grip. As a result, the rear wheels begin to spin and slide toward the outside of the corner. This has the effect of reducing the cornering force at the rear wheels. Since this results in excessive oversteer, it becomes very difficult to control the vehicle.
With a more powerful engine there is an even greater possibility that the rear of the car will suddenly swing out during acceleration whilst cornering, especially on a slippery, road surface.
A 4WD car provides much better traction and stability because the power is distributed to all four wheels. But, when it comes to cornering it tends to understeer.
This occurs because the cornering force is reduced as the drive torque causes sideslip. As a result, the car will not follow the desired line,
In the conventional Ferguson 4WD or rigid 4WD system, drive torque is split between the front and rear wheels at virtually a fixed ratio of 50:50. When accelerating during cornering on a dry road surface, large understeer occurs that limits the degree of control over vehicle behaviour that is possible via the accelerator. We could try to correct this drawback by reducing the torque split to the front wheels to a ratio of 10:90. But then It would result in large oversteer on low friction road surfaces. This means that conventional 4WD systems, having a front/rear torque split that is virtually fixed, cannot deliver ideal cornering performance on all types of road surfaces.



E-TS benefits from excellent controllability via accelerator inputs, with steering characteristics ranging from weak oversteer to weak understeer. Usually when a 4WD car is equipped with ABS, its anti-lock braking performance is generally inferior to that of a two-wheel-drive car but the variable torque split 4WD E-TS system has been designed to overcome this by switching to RWD during ABS use
When braking, but not using the ABS, the E-TS reads the engine speed and wheel speed. It then calculates exactly how much front wheel torque is required to give the optimum braking using engines and wheel braking; it does this to maintain even braking to all wheels.
The E-TS has a rapid take off function, on initial pull away torque is applied to the front wheels proportional to accelerator pedal position before wheel spin is detected
As a result, E-TS enables the car to deliver its legendary acceleration, cornering and braking.


The major features of the E-TS system can be summed up in these three points.

1) Designed around a rear-drive layout, it transfers the torque to the front wheels that portion of the drive torque which the rear wheels cannot handle. This makes it possible to provide the sure-footed traction of a 4WD car as well as the outstanding cornering ability of a rear- drive car.

2) By varying the torque split to the front wheels according to the friction of the road surface, it delivers ideal cornering performance on all types of road surfaces.

3) Integrated controls over torque split and ABS achieves an outstanding balance of running, cornering and stopping.


What does the Skylab FUSION do?​

The FUSION has 2 uses.

The 1st is as a direct replacement for a Nissan G-Sensor.
The FUSION can be bolted in as an upgrade, or to replace a defective unit. The FUSION is a much more robust unit and can exceed the G-Force of the original item. It has a quicker response time and is much more repeatable. Without the commander, the FUSION is a modern day replacement unit.

The 2nd use combines the FUSION G Sensor unit with the commander.
The commander is a simple to use box with 1 button and 2 dials. The button is labelled ***8216;ZERO***8217;. This is used to zero the G-Sensor after fitting to the car. The unit is zeroed during manufacture but because the FUSION is very reactive, it is important to zero it after fitting. This is because the customer***8217;s car might have been lowered etc. and might not sit flat. This is done by pressing and holding the ***8216;ZERO***8217; button and turning on the ignition. This only needs to be done once after fitting.

An understanding of how the E-TS works is needed to get the best from FUSION. The description below explains how the G force affects the E-TS and what effect adjusting the dials have.
The E-TS system was developed by Nissan to give the Skyline the best possible handling. Nissan tested Front Wheel Drive, Rear Wheel Drive, fixed 4WD and electronic 4WD and decided that the optimum drive layout was variable 4WD.

The reason ***8216;E-TS***8217; is the superior through cornering because it tried to maintain a set tyre sideslip angle. The tyre sideslip angle is where the car is over steering slightly. This is detected by the rear wheel speed exceding the front wheel speed by a predetermined amount.



Lateral G Adjustment. (cornering)

If the car has not generated much lateral G and the wheel speed sensors are detecting tyre sideslip, then the E-TS knows the car is on the low friction surface. To maintain the desired tyre sideslip angle on a low friction surface, the E-TS knows that a lot of front torque is required to pull the front around to stop the car from spinning.
If the car has generated a lot of lateral G and the wheel speed sensors are detecting tyre sideslip angle, the E-TS knows the car is on a high friction surface. To maintain the desired tyre sideslip angle on a high friction surface, the E-TS knows that a small amount of front torque is required to pull the front around to stop the car from spinning
What the Skylab FUSION does is allow the driver to change how much lateral G the E-TS actually sees. The maximum lateral G the E-TS uses is 1.2. For any given lateral G, the driver can increase or decrease that value. This means that you can tell the E-TS the car is on a higher or lower friction surface, thus the amount of front wheel torque for that given condition can be increased by turning the knob clockwise, or decreased by turning the knob anticlockwise. This gives the driver to trim the cornering characteristics from oversteer to understeer.

Longitudinal G Adjustment(acceleration)

The longitudinal adjustment is for adjusting the amount of torque split when accelerating.
Using a combination of longitudinal acceleration and wheel speed difference the E-TS calculates the traction available, if wheel spin and high longitudinal G are detected, the E-TS assumes high grip and there is little front torque split. If wheel spin and low longitudinal G are measured, the E-TS assumes a low friction surface.

The E-TS uses a combination of longitudinal and lateral G along with wheel speed to determine how much front torque split is required to give the desired tyre sideslip angle.
By using a combination of the lateral and longitudinal adjustment knobs, the driver can increase or reduce the tyre sideslip angle, thus transforming the way the car performs whilst accelerating and cornering.


What else does the ET-S do?​

The E-TS is an integral part of your cars handling and braking system. The ECU is essentially 2 ECUs that communicate.



One ECU is for ABS and the other is for traction control
When you put the ignition on, the E-TS does a full system check and alerts the driver to any malfunction by illuminating either or both the 4WD and ABS lamps. Should any part of the system fail during driving, the lamps will illuminate alerting the driver to a potential issue. The driver can react accordingly. The Skylab FUSION does not affect this self-diagnosis aspect of the E-TS.


Below is the revised system with the SKYLAB FUSION fitted.




Fitting is fairly easy. The simplified steps are as follows:-
Remove center console
Unplug old G-Sensor
Unbolt G-Sensor mounting plate from car
Un-screw old G-Sensor from mounting plate
Bolt Fusion to mounting plate
Cut connectors off old G-Sensor
Solder plugs into Fusion
Re-fit mounting plate
Cut hold in center console for commander cable
Thread commander cable through center console and plug in
Re-fit center console
Drink tea

This is what the R32 Fusion looks like when ready to re-fit.





You***8217;ll notice the R32 retains the same metal housing
This is what the R33 Fusion looks like when ready to re-fit.





The price is £230 delivered.
 

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This looks a great bit of kit at a excellent price!!
how simple is it to work out the balance between the two variables?
 

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Hi Combat, I have been waiting for you to come out with this. But you have not mentioned the R34 GTR
Have you included the 34 in your development and if so, is compatibility with the R34 GTR including the MFD sorted.
 

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Discussion Starter #4
Hi Combat, I have been waiting for you to come out with this. But you have not mentioned the R34 GTR
Have you included the 34 in your development and if so, is compatibility with the R34 GTR including the MFD sorted.
I have had a look at the R34 and it will fit no problem. I am fitting one on this Sunday and will then be able to do a full write up with images. The R34 will required 4 holes drilling in the G-Sensor mounting plate.

The MFD will still work, but as it reads from the G-Sensor, any adjustment made with the commander will also adjust the readings seen on the MFD.
 

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Discussion Starter #5
This looks a great bit of kit at a excellent price!!
how simple is it to work out the balance between the two variables?
Good point Andy.

It's fairly easy to find a good balance. I would suggest adding a little to the 4WD when cornering and removing a little 4WD in a straight line.

We really need a little input from R32Hams, he has done the majority of the testing for me.

As with all adjustments, a little at a time is the way to go. Different cars, different drivers, different settings. I hope to be at Silverstone in a few weeks with the aim of analyzing the R34 setup on track.
 

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Discussion Starter #7
This is what the R32 owners will receive.

 

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This looks a great bit of kit at a excellent price!!
how simple is it to work out the balance between the two variables?
Hi Andy,
the fusion has been designed to give the same output as the standard g sensor when both dials are in the middle(or when the commander is unplugged)this is an ideal starting point as in reality this setting tends to give slightly more 4WD bias than the stock unit,due to the increased sensitivity and faster response.
The setting of the fusion is as easy as it could be,set the left dial(cornering) first,then once your happy with the cornering balance, move on to the right,
Anyone currently useing a TSC EVO can set the first dial(cornering)to the same setting as there old unit,if not then its best to start with too much 4wd and work back from there.
As for the second dial(acceleration)it would be usual to start in the middle,and to remember to reckeck the cornering setting after making any changes.Once you have a setup your happy with the main use for the adjustment is a change in grip due to weather or surface.
Unfortunaly I cant give out a magic setting as our cars(skylines) vary so much,thats why the wide adjustabilty of fusion is key,as is the ability to perfectly level the g meter at the touch of a button.
Hope this is some help.
 

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this is all sounding very good, looking fwd to the write up on the 34GTR
 

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Looking forward to seeing some test results on a 32. Would be great to see Sam (git-r) do a before and after test one of these as he does so many trackdays and seems to be a master of the 'side-ways'. British product too, can't be bad. :)

Cheers

Stu
 

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Got mine through the post today, thanks again Andy, looks like a quality bit of kit. Will hopefully get round to fitting it in the next couple of days.
 

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Mine came in the post today, so I had to have a play :)


Even with the dials on 0 the torque gauge seems more perky, had a little play on full 4wd and full rwd, and I could definately feel the difference even pootling around, which means I fitted it right at least. Needs a track session to get to grips the differences between the two dials properly I think.

BTW Instructions spot on except that the yellow wire connects to the green wire, easy to figure out as all the rest match colour for colour.
 

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Discussion Starter #16
I am colourblind, hence the gaff. Lol.
How much too long was the commander cable?
 

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Discussion Starter #18
Good, you can thank r32hams for that.
 

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Discussion Starter #19
Marks R32 fitment. Looks rather good.





The internal bits.

 
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