The 4wd seems to be passive, if that is the right word.
I.e: the rear wheels recieve drive when the front start to lose traction. I only notice the rear wheel drive when going round corners at speed. Pulling off in a straight line, it feels like only the front wheels are driving. I might be wrong.
Yes pulling the fuse will lead to front only, but why would I do that ? hm ?
What a really want is more bias to the rear I guess.
But I doubt there's a mod to do that.
The 4 wheel drive system is controlled by a very smart computer. If it detects either the front or back wheels loosing traction it will put the power through the 'other' set of wheels to keep power available. It can switch as high as 100% either front or rear.
Under no account do you want to change this since it could cause the car to spin out at random.
You can only feel in round corners because thats what its like. How were you going to feel it?
Don't worry, everything is fine and whatever you do don't change anything.
Oh my dear god I knew I should have stayed back at work to reply to this.....
Lets begin shall we
The 4WD system in the Cavalier/Calibra is passive but set at 75:25 split (front:rear) under normal conditions. When slip is deteced then the drive can be as much as 100%.
The system DOES have an ECU (computer) but this does not control the power split and doesnt measure the slippage on each axle at all.
The 4WD power split is entirely mechanical and uses a viscous coupling to work out the slippage and apply the drive to the wheels.
The drive to the rear wheels is dis-engaged during braking or when there is a system fault. This is for 2 main reasons -
To maintain predictable cornering
To enable ABS to be fitted to the car. If the rear wheels were not dis-engaged then the ABS and 4x4 would be fighting over where to put or cut the drive.
It IS possible to have a permanent split of whatever you choose (e.g. 50:50 etc) The only place that does this PROFFESIONALLY AND PROPERLY is Dorfbrunnen Garage in Switzerland. They can arramge your transfer box to be shipped over, converted and shipped back.
It is worth it to have this conversion.....
Before you go any further (and for anyone that wants to know) you may want to read the techincal section that has been written about the 4WD system. This tells you exactly how it works and can be found here - 4WD Tech Section
Not that I know off Gary, but it would be a scream
Oi Oddball, I didnt quite see that last point of yours there. This so called "crappy viscous coupling" is not the weak point of the transfer box and its so "crappy" that Subaru decided to use this same style of system in their new Imprezas and Sunny GTiR's use this idea as well.
The weak point is simply the gasket seperating the PAS fluid of the hydraulic clutch and the rest of the transfer box.
The conversion I mentioned above solves this problem as there is no need for the clutch as the drive is not dis-engaged.
Again, if you read the stuff on my site then it tells you the problems in the "What Can Go Wrong" section.
A variable split would be more flexible which is a good thing but here is a problem that all 4WD systems of this sort compared to permanent split systems.
The system can measure wheels slip in the forward or backwards direction but it cannot measure any wheels slip in a sideways direction e.g. like understeer on a 2WD car where the car is sliding across the width of the wheel.
In the wet, the 4WD is a lot better for grip than a 2WD but it still suffers from understeer if pushed hard.
If there is a permanent 50:50 split then the understeer is reduced or stopped.
It will take a lot more practice to get used to it and it wont be as forgiving as the standard Vauxhall 4WD system but, once mastered, you can really hold it on corners etc.