Front / Rear Power Split
26 August 2012, 01:09 PM
#1
Scooby Regular
Thread Starter
Front / Rear Power Split
Hi,
WRX STi Spec D 07/07.
What is the front / rear power split on these?
49% Front / 51% Rear?
And what would my old 54 plate WRX STi blob have been in comparison, as I think the split is very different?
WRX STi Spec D 07/07.
What is the front / rear power split on these?
49% Front / 51% Rear?
And what would my old 54 plate WRX STi blob have been in comparison, as I think the split is very different?
26 August 2012, 07:18 PM
#5
Scooby Regular
Right. if you really want to know...read on.
Your 04 Blob ran a centre differential with a viscous coupling. It had by necessity a 50/50 split which meant that torque split was equal front to rear. The front was if I can remember an open sun/planet diff and the rear a TORSEN type SURETRAK diff.
If either end was to spin up the shear forces in the fluid centre diff would cause it to progressively lock up and transfer torque. In reality, the car would easily spin the front pulling out of junctions in wet conditions as load went to the rear, the open front would cause the inside to spin up and you would understeer across the road with cheap tyres- well I often did!
The 06/07 Hawkeye STi, as per the 05 Blob had the DCCD. This meant the open torque split was 35f/65r but the ratio changed slightly on models. The Spec D, as mine is is listed as 35/65 in the manual.
The car has a helical limited slip front and SURETRAK rear diff too.
The DCCD is effectively a locking clutchpack operated by an electromagnet. It's torque not wheel speed that determines all this so read up on it.
I'd make sure you have a few hours first though......
Your 04 Blob ran a centre differential with a viscous coupling. It had by necessity a 50/50 split which meant that torque split was equal front to rear. The front was if I can remember an open sun/planet diff and the rear a TORSEN type SURETRAK diff.
If either end was to spin up the shear forces in the fluid centre diff would cause it to progressively lock up and transfer torque. In reality, the car would easily spin the front pulling out of junctions in wet conditions as load went to the rear, the open front would cause the inside to spin up and you would understeer across the road with cheap tyres- well I often did!
The 06/07 Hawkeye STi, as per the 05 Blob had the DCCD. This meant the open torque split was 35f/65r but the ratio changed slightly on models. The Spec D, as mine is is listed as 35/65 in the manual.
The car has a helical limited slip front and SURETRAK rear diff too.
The DCCD is effectively a locking clutchpack operated by an electromagnet. It's torque not wheel speed that determines all this so read up on it.
I'd make sure you have a few hours first though......
26 August 2012, 10:33 PM
#6
Right. if you really want to know...read on.
Your 04 Blob ran a centre differential with a viscous coupling. It had by necessity a 50/50 split which meant that torque split was equal front to rear. The front was if I can remember an open sun/planet diff and the rear a TORSEN type SURETRAK diff.
If either end was to spin up the shear forces in the fluid centre diff would cause it to progressively lock up and transfer torque. In reality, the car would easily spin the front pulling out of junctions in wet conditions as load went to the rear, the open front would cause the inside to spin up and you would understeer across the road with cheap tyres- well I often did!
The 06/07 Hawkeye STi, as per the 05 Blob had the DCCD. This meant the open torque split was 35f/65r but the ratio changed slightly on models. The Spec D, as mine is is listed as 35/65 in the manual.
The car has a helical limited slip front and SURETRAK rear diff too.
The DCCD is effectively a locking clutchpack operated by an electromagnet. It's torque not wheel speed that determines all this so read up on it.
I'd make sure you have a few hours first though......
Your 04 Blob ran a centre differential with a viscous coupling. It had by necessity a 50/50 split which meant that torque split was equal front to rear. The front was if I can remember an open sun/planet diff and the rear a TORSEN type SURETRAK diff.
If either end was to spin up the shear forces in the fluid centre diff would cause it to progressively lock up and transfer torque. In reality, the car would easily spin the front pulling out of junctions in wet conditions as load went to the rear, the open front would cause the inside to spin up and you would understeer across the road with cheap tyres- well I often did!
The 06/07 Hawkeye STi, as per the 05 Blob had the DCCD. This meant the open torque split was 35f/65r but the ratio changed slightly on models. The Spec D, as mine is is listed as 35/65 in the manual.
The car has a helical limited slip front and SURETRAK rear diff too.
The DCCD is effectively a locking clutchpack operated by an electromagnet. It's torque not wheel speed that determines all this so read up on it.
I'd make sure you have a few hours first though......
Just to add to this, the later hatch sti 6spd box onwards the center diff is a planetary gearset that apportions a torque plate 41 percent front and 59 percent rear. It's paired with an electronically controlled clutch-type limited-slip differential that is tied into the stability control hardware and software.
27 August 2012, 09:09 AM
#7
Just to add to this, the later hatch sti 6spd box onwards the center diff is a planetary gearset that apportions a torque plate 41 percent front and 59 percent rear. It's paired with an electronically controlled clutch-type limited-slip differential that is tied into the stability control hardware and software.
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