Power ratio on front vs back wheels
03 June 2004, 11:28 AM
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Power ratio on front vs back wheels
Just wondering........
I have an MY03 WRX (no lsd) & wondered how much of the total power is put to each set of wheels ?
Is it a 60/40, 70/30 split ?
And which way? (more to the front or back)
Thanks!
Gutter
I have an MY03 WRX (no lsd) & wondered how much of the total power is put to each set of wheels ?
Is it a 60/40, 70/30 split ?
And which way? (more to the front or back)
Thanks!
Gutter
03 June 2004, 11:32 AM
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I asked the same question a few weeks ago mate and no-one seemed to be able to give me a conclusive answer.
I have an MY03 STi.
A few suggested it was a 60/40 split. 60 front, 40 rear.
I have an MY03 STi.
A few suggested it was a 60/40 split. 60 front, 40 rear.
03 June 2004, 11:53 AM
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03 June 2004, 12:07 PM
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Originally Posted by scooby L
03 June 2004, 01:45 PM
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Originally Posted by Harry_Boy
Sorry mate - am I missing something here? Can't see any reference to F:R split, except for the auto....
But I may have been incorrect?
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03 June 2004, 01:49 PM
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found this on another forum..
"Standard WRX's are a 50/50 split(primarily a front drive car) with power going to the front wheels until slip is sensed then the center dif sends power to the rear wheels. The STI is a 65/35 split rear to front being a primarily rear drive car until wheel slip occurs."
"Standard WRX's are a 50/50 split(primarily a front drive car) with power going to the front wheels until slip is sensed then the center dif sends power to the rear wheels. The STI is a 65/35 split rear to front being a primarily rear drive car until wheel slip occurs."
03 June 2004, 02:05 PM
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That quote is wrong Scooby L.
Gutter-rat: UK WRX's have a bevel geared centre differential which has a nominally equal torque distribution from front to rear. The comment about the car being primarily front drive with power being sent to the rear "when slip is sensed" is plain wrong, the rear axle is powered at all times.
The WRX centre diff has a viscous coupling, which, on UK and European market cars, is preloaded slightly via unequal drop gears (and compensating unequal front/rear axle ratios).
The unequal drop gear setup means that, when traction is broken, there will be a slight bias to the front axle due to the preload. However, the exact split is still a subject of some debate among some of the more clued-up peeps. At most, there is a 55:45 bias in favour of the front, however, I suspect that in most circumstances it's more equal than that.
Incidentally, the comment about the STi having a 65/35 split is also wrong, in the blanket context quoted above. The only cars that work that way are those equipped with the driver controlled centre diff - i.e. some of the Japanese specification STi's, the US STi, the European "Solberg Edition" and the WR1. The STi Type UK's, Euros and non-DCCD JDM cars have the same broadly equal torque split explained above.
Gutter-rat: UK WRX's have a bevel geared centre differential which has a nominally equal torque distribution from front to rear. The comment about the car being primarily front drive with power being sent to the rear "when slip is sensed" is plain wrong, the rear axle is powered at all times.
The WRX centre diff has a viscous coupling, which, on UK and European market cars, is preloaded slightly via unequal drop gears (and compensating unequal front/rear axle ratios).
The unequal drop gear setup means that, when traction is broken, there will be a slight bias to the front axle due to the preload. However, the exact split is still a subject of some debate among some of the more clued-up peeps. At most, there is a 55:45 bias in favour of the front, however, I suspect that in most circumstances it's more equal than that.
Incidentally, the comment about the STi having a 65/35 split is also wrong, in the blanket context quoted above. The only cars that work that way are those equipped with the driver controlled centre diff - i.e. some of the Japanese specification STi's, the US STi, the European "Solberg Edition" and the WR1. The STi Type UK's, Euros and non-DCCD JDM cars have the same broadly equal torque split explained above.
03 June 2004, 05:46 PM
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Originally Posted by greasemonkey
That quote is wrong Scooby L.
Gutter-rat: UK WRX's have a bevel geared centre differential which has a nominally equal torque distribution from front to rear. The comment about the car being primarily front drive with power being sent to the rear "when slip is sensed" is plain wrong, the rear axle is powered at all times.
The WRX centre diff has a viscous coupling, which, on UK and European market cars, is preloaded slightly via unequal drop gears (and compensating unequal front/rear axle ratios).
The unequal drop gear setup means that, when traction is broken, there will be a slight bias to the front axle due to the preload. However, the exact split is still a subject of some debate among some of the more clued-up peeps. At most, there is a 55:45 bias in favour of the front, however, I suspect that in most circumstances it's more equal than that.
Incidentally, the comment about the STi having a 65/35 split is also wrong, in the blanket context quoted above. The only cars that work that way are those equipped with the driver controlled centre diff - i.e. some of the Japanese specification STi's, the US STi, the European "Solberg Edition" and the WR1. The STi Type UK's, Euros and non-DCCD JDM cars have the same broadly equal torque split explained above.
Gutter-rat: UK WRX's have a bevel geared centre differential which has a nominally equal torque distribution from front to rear. The comment about the car being primarily front drive with power being sent to the rear "when slip is sensed" is plain wrong, the rear axle is powered at all times.
The WRX centre diff has a viscous coupling, which, on UK and European market cars, is preloaded slightly via unequal drop gears (and compensating unequal front/rear axle ratios).
The unequal drop gear setup means that, when traction is broken, there will be a slight bias to the front axle due to the preload. However, the exact split is still a subject of some debate among some of the more clued-up peeps. At most, there is a 55:45 bias in favour of the front, however, I suspect that in most circumstances it's more equal than that.
Incidentally, the comment about the STi having a 65/35 split is also wrong, in the blanket context quoted above. The only cars that work that way are those equipped with the driver controlled centre diff - i.e. some of the Japanese specification STi's, the US STi, the European "Solberg Edition" and the WR1. The STi Type UK's, Euros and non-DCCD JDM cars have the same broadly equal torque split explained above.
04 June 2004, 11:04 AM
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Greasemonkey is spot on with his facts ,but there is one important thing to note on the DCCD version or your WR1 .The split on these cars is 35 front 65 rear the driver can only alter the LSD clutch engagement torque for the front wheels back to a 50 - 50 split and has no control over the mechanical action of the centre diff and unfortunatly you cant wind all the power to the rear wheels which is a common misconception !
06 June 2004, 06:26 PM
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Yes. Plenty been written on this in the past so try the Search button before dragging this thread off-topic. 
Suffice to say that the diff is an epicyclic type which splits the power 33/66 in favour of the rear axle. The driver controlled part is an electromagnetic clutch which progressively "sticks" the front and rear outputs together, providing a slip limiting function and increasingly counteracting the rearward bias of the diff.
Suffice to say that the diff is an epicyclic type which splits the power 33/66 in favour of the rear axle. The driver controlled part is an electromagnetic clutch which progressively "sticks" the front and rear outputs together, providing a slip limiting function and increasingly counteracting the rearward bias of the diff.
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