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Diff Lock Button?

loymclure
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loymclure Proficient

loymclure

Posted
Posted

pretty sad that ive been driving the car for a year and i still dont know what this button is for .... lol.

the button is located on the left hand side of the streering wheel

sorry about the quality of the pic i took it on my phone at night.

post-34650-1180779591.jpg

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https://www.sau.com.au/forums/topic/171139-diff-lock-button/
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Duncan Grand Master

Duncan

Posted
Posted

don't see how it can make a difference - unless there is wheel spin it doesn't matter about what the torque split is off the line. And I'll be stuffed if I can get any wheelspin no matter how much I abuse it.

Appealing Proficient

Appealing

Posted
Posted

Exactly.....

Mine neither.... In theory using the 50/50 will limit the torque to the front/rear, and therefore if you encountered wheelspin, it just might actually be slower off the line. If you get wheelspin.... get fatter tyres!! :laughing-smiley-014:

The auto trans is that clever that I just let it do it's thing.... in this case computers rule..... (probably 'cos Bill FN Gates had nothing to do with it. Otherwise you have to have the windows open to start the fkin thing!!!).

webng Experienced

webng

Posted
Posted
Exactly.....

Mine neither.... In theory using the 50/50 will limit the torque to the front/rear, and therefore if you encountered wheelspin, it just might actually be slower off the line. If you get wheelspin.... get fatter tyres!! :laughing-smiley-014:

The auto trans is that clever that I just let it do it's thing.... in this case computers rule..... (probably 'cos Bill FN Gates had nothing to do with it. Otherwise you have to have the windows open to start the fkin thing!!!).

But I was under the imppression that the 50/50 diff lock just starts off at that ratio instead of 95/5 AND still distribute torque accordingly.

pixel8r Mentor

pixel8r

Posted
Posted
But I was under the imppression that the 50/50 diff lock just starts off at that ratio instead of 95/5 AND still distribute torque accordingly.

This is more correct. After a certain RPM (or at least once you get higher into the rev range, say over 2500rpm?) the awd system will still put more torque to the rear as necessary, but will favour 50:50. With the button off, its the same principle but it would instead favour 95:5. Hope that makes sense :thumbsup:

As far as being faster, I would imagine it WOULD be slightly faster mainly because driving the front wheels will likely help with the weight transfer, not sure if this is correct - I might be way off the truth, but IMO it would be better to share the acceleration over all 4 wheels, than just the rears...who knows?

In any case, under full load the awd system will basically be running 50:50 torque split anyway, so the difference between button on/off when under hard acceleration is probably nil or at least minimal. :D

It is worth noting however that the system is not really designed to be used in 50:50 mode full time for daily driving and a few people have cautioned using it like this for fear of burning out the clutch packs prematurely... I'd like to think it was built strong enough to handle it but I'm not willing to risk it :) Occasionally I'll use 50:50 for driving in the wet but only in extreme weather conditions and bad road surfaces...

Duncan Grand Master

Duncan

Posted
Posted

well who knows, in practice I think it would make bugger all difference...but on the dyno our gtr makes about 10% at the wheels more in RWD than in 4WD

You definately don't want to run in 50/50 mode all the time, we burned out the clucth packs in the race car running lots of front torque in about 30 minutes - lost all fwd until we rebuilt the transfer case

Ska Grand Master

Ska

Posted
Posted

With 205's + wet road = 4wd spin from a standing start, with the 50/50 button pressed or not. It's really weird when the car does not move forward, rather lurches suddenly sideways, following the lean of the road.

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