It should be 50/50, if not then its 40/60.

 

http://www.overboost.com/story.asp?id=121

50/50

 

It is 50/50.

 

It is 50/50, but I think that it is the front right, and the back left that rotate a little more than the front left and back right. This is because the transmission doesn't have a LSD (limited-slip differencial)in it. You may have noticed that the front right tire, and the back left tire wear tread a little quicker than the others. This is the reason why. With an LSD, you will have 100% 50/50 between the wheels.
Dane
LSD's run around $800-1300.

 

I though it was vairable front to back and side to side

 

I though it was vairable front to back and side to side

No, you are confused.

 

not the first, not the last as you well seen in other posts I know the Vette is 100% rear

 

I thought the Vette was FWD.

 

You got it confused with the chevette...

 

Lol!!

 

You're asking about torque split, not power to weight ratio (as I was gathering from the subject).

During constant speed, no spinning, the split is 50/50. The center differential however does have a viscous coupling, and can adjust the torque split (front to rear only here). From memory, I thought the greatest offset would be 30 front 70 rear, but I don't remember where I had seen that any more. The front diff has always been open, so side to side front isn't controlled. Rears were optional lsd for most years (standard on just a few).

 

You got it confused with the chevette...

Chevettes were RWD too....look it up

I believe our AWD systems are bias to the front wheels and drag the rear slightly.
Who has paid close attention to AWD DSMs launching at the track?
Even the higher HP cars with welded center diffs, the front tires seem to move first and spin a little faster than the rear.
The math of the gear ratios may show a perfect 50/50 bias, but my observations and experiance tell me there is an offset.

 

My car always spins the rears when I launch it hard. Also, try this, when it's a little damp outside and your car makes a little power, gun it in 2nd gear and watch the rear end break lose like a RWD. I know on mine it does. If it was biased to the front, it would spin the fronts in that case. Just my observations.

My car still has the stock drivetrain in it including the stock 3-bolt (LSD) rear.

 

I can't come to any conclusion about my own experience spinning the tires. I've roasted the rears on luanches, but I've also broken the fronts loose from rolls. Then again, I've spun all 4 off the line, and chirped all 4 hitting 3rd. Then again, I think more people are removing more weight from the rear end, and making the natural bias to the spin the rears a little higher. My weight reduction has been focused all over the car instead of just one area.

 

You're asking about torque split, not power to weight ratio (as I was gathering from the subject).

During constant speed, no spinning, the split is 50/50. The center differential however does have a viscous coupling, and can adjust the torque split (front to rear only here). From memory, I thought the greatest offset would be 30 front 70 rear, but I don't remember where I had seen that any more. The front diff has always been open, so side to side front isn't controlled. Rears were optional lsd for most years (standard on just a few).

I'm not saying you are wrong, because I also are not sure, but I think the split is 70% front, 30% rear when spinning.

 

I'm not saying you are wrong, because I also are not sure, but I think the split is 70% front, 30% rear when spinning.

Wrong. It's 50/50. Somebody find that damn writeup that was posted here awhile back. The rears will always spin easier when launching, punching it in the rain etc. because the rear is simply lighter than the front. I sell WRX-STI's at work and that AWD is the shit, plain and simple. You can adjust the torque split at the turn of a dial for more fun in the rear.

 

In the rain i can get my car sideways with a desent launch. So I would have to say 50/50. The wieght plays a big factor in what you see in launches.

 

depends, are we talking 1st gen or 2nd gen. also are we talking bone stock or heavily modded. this may be slightly different from 1st gen to 2nd. Your weight is a huge factor in where your engine places the torque. If you dont have lsd the engine will always put more torque to the tire(s) with the least amount of friction <<(louisiana mudhole theory). when you launch (even w/awd) you have a transfer of weight to the rear of the car, explaining front spins on launch. usually if you can get your car sideways easily the bias is obviously to the rear a little more. BUT there are MANY other factors why you can get it sideways so easy, such as; height, bound/rebound, viscous condition, tire psi, tire tread(uneven wear), and alignment.

 

In my 2G, a hard launch in the rain, my fronts will spin, then my rears, then they will all hook up. It is a 50/50 split under acceleration. It can go from 100/0 to 50/50, but never a RWD bias, unlike the 3/Ss, which have a 45/55 RWD bias. Ours is what happens when we have an FWD car, made to work AWD.

And there is a little trick in the STi/STIs...

You yank the e-brake one click you disengage the front diff and lock the center diff. Can we say DORIFTO!!!

 

My car always spins the rears when I launch it hard. Also, try this, when it's a little damp outside and your car makes a little power, gun it in 2nd gear and watch the rear end break lose like a RWD. I know on mine it does. If it was biased to the front, it would spin the fronts in that case. Just my observations.

I always feel my front slip before the rear (welded center diff or stock).
Although the rear does come around like a RWD.
I notice the bias between front and rear greater in an A/T car than 5spd.

The only other factor I can throw in is the rear camber adjustment. When the car squats the camber goes further negative with less tire surface in the rear in contact with the road than the front.
My A/T car has lengthened upper control arms and I have the suspension adjusted where negative camber is very limited on a launch.

 

Once again guys, there is no bias, it is 50/50 period.

 

DSMs are front wheel biased (at least 1g's). More power is diverted to the rear if the fronts slip. Adding a front limited slip differential greatly improves tranction in these cars. How many of you guys that have serious wheel spin on launch have tire residue in your passenger side wheel well? I have pictures of some of my lauches and the passenger front tire is a blur and the rears are just starting to spin.

I'll have to dig it up but in their initial review of the Diamond Start twins Car and Driver stated that the AWD system for these cars are 70/30 full-time split and 50/50 once slippage occurs. The 70/30 split is to increase gas milage during cruise. With my welded center diff, 3 tires are spinning at the same speed at launch. I get consitent 1.5 60fts but with a front LSD I should dip into the 1.4x range.

 

Wheel spin is more a function of traction and weight distrobution when accelerating. A slight difference in torque bias makes no difference compared the the traction lost in the front from weight transfer to the back.

When I auto-x, just about everytime I get to a straight section and go full throttle the front tires spin then the center locks and they stop. This is even with my 245 hoosiers.

-Dallas J