AE86's Suspension Setup in Sony Play Station Grand Turismo

8 March 04

KE70 is highly similar to AE86 inside, i.e. chassis length, track and width. All suspensions, gearbox, axles and engine with the chassis cross-member is also interchangeable, therefore the AE86 handling in Sony Play Station Grand Turismo will be studied under simulation condition as well as TRD modifications availability and specifications.

The AE86 original spec is 1.6kg/mm front and 1.8 kg/mm rear. This figure is believed to be applicable to KE70.

Playing the game of Sony Play Station One's Grand Turismo also showed that the TRD package front is always slightly lower than the rear and that the spring rates are no higher than 3.3 kg/mm. 

original Sport Semi Racing Racing Support
front rear front rear front rear front rear
spring rate (kg/mm) 1.6 1.8 2.1 2.3 2.4 2.7 2.4 2.7
height (mm) 150 150 135 135 128 128 128 128
damper level 0 0 2 2 2 2 4 4
camber (negative degrees) 0 0 0 0 1 0.5 2 1
anti sway bar 0 0 0 0 0 0 0 0

This contradict to everything on the internet as well as magazines. However this issue will be given serious considerations and study.

After seeing the data I am seriously doubting that I've made a mistake / overdone the front by using 5.5 kg/mm, while the rear is 3.3 kg/mm. Although TRD offers as high as 8 kg/mm front in reality. recommends 6 kg/mm front and 4.8 kg/mm rear for street / race combination.

Not only this. In the game the front spring rate ranges from only 1.6 to 3.1 while the rear is 1.8 to 3.3. Again rear higher than front. Assuming these figures are official from TRD for AE86, then these should be applicable to real life KE70.

Another model in the game was tried - Supra of the 70s MA70. It is approximately 3,500 lbs versus AE86's 1,900 lbs. It's spring rate is high in the 7 kg/mm areas. This leads me the believe that the figures are accurate.

This is not so surprising anymore, because all the while it is known that KE70 have weight distribution of 52% front 48% rear. If so, the spring rate between front and rear should be close to 50% 50% but it is not. Instead if it bias softer towards the front.

Perhaps the car exhibit too much under-steer, which is what I am facing now and could be rectified by setting the front softer than the rear and would reduce under-steer.

In the game the setting of 3.1 kg/mm front and 1.8kg/mm rear is tried to simulation as close to my current condition of 5.5 kg/mm front and 3.3 kg/mm rear. The values' different are too great, but at least the front strong rear weak ratio is a good start for testing study.

The result is the car exhibit great under-steer.

Then the setting of 1.6 kg/mm front and 3.3 kg/mm rear is again tried and improve from under-steer allot.

The ride height is also tested and found that when the rear is set higher than the front it will again reduce under-steer. 

The damper figures are not directly link-able to reality hence unable to make acceptable study.

The anti-sway-bars also have not been checked out. A future report will be made.



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