Whats going on here, my car seems to want to drive off to the left, wet or dry.

However in the rain its just downright dangerous!

Its as if the only drive wheel is the right rear wheel!.

If I punch the gas, it drives off to the left (the rear wants to come out from the right).

In the rain, if I just lightly hit the gas, the rear walks off to the right!!

Somthing has to be wrong back there.

 

Check the rear tire pressure.

Check the alignment.


My money says you have a leaking tire...

 

Can you explain how that would cause the problem?

(Mechanically?)

 

Weight would be applied to the tire raising the car more.. Thus bringing the lower pressure tire to have less weight on it. So the car should pull to the side with lower tire pressure.

 

Creative, but incorrect. So if you let the air out of all the tires they would have less weight on them?

The FD has an LSD. When one rear tire is low in pressure compared to the other the low tire has higher drag but more importantly a smaller rolling diameter than the normal tire. The car will turn towards the "flat" tire anytime you gas it because the rolling diameter of the opposite tire is larger.

Without an LSD this effect wouldn't be nearly as pronounced as it is. Put the spare tire dougnut on the rear and drive around the block once. Same effect.

 

I think hes right...

What hes saying is that the other tires are higher in ride height, but ONE is low.
that ONE has less weight on it.

Thats true.

But ultimately your BOTH correct here.

the spare is not raising the car up as much either.
so its prone to slipping as a low tire would be under load.

the combination of rotating diameter and level suspension is combining with the LSD to cuase this problem i'm sure.

 

has your car ever been in an accident

 

That's crazy. Just because one tire has less air pressure in it does not mean one side of the car somehow became heavier or lighter.

The difference in circumference of the two rear tires coupled to a limited slip diff is what causes the problem. Not weight or ride height.

 

How about the PPF? If he had a cracked or bent power plant frame could it cause what he is describing when under load.

 

NO accident.....
No its not crazy.

Its the TRIPOD effect.

Its not as pronounced as your thinking it is however.

Its not like tha car can be see-sawed on one flat tire.

however, if the left rear is lower, the front right loses a bit of wieght.
and the left front and right rear weight load INCREASES.

a SLIGHT version of the see-saw effect.

Put scales under each tire and let the air out of one.
See the opposite corner lighten, and the other corners increase.

 

Okay, now you're just trying to scare me.

 

I understand this but if that were the main contributing factor you would have issues at all times and not mainly when you hit the gas. When you hit the gas you provide drive to the tires and the problem becomes much greater. If it was merely due to ride height, weight and drag on the tire it would not get worse when you hit the gas, it would be constant.

 

can also be real bad toe links, real bad differential mounts can cause a little twisting at start. a low tire could cause the car to slighty pull to one side.

 

Tomorrow ill test all thest things.

I'll letchya know!

 

It was Air pressure.
I have a constant slow leak in the right rear.

I swapped the tires and thepull went in the OPPOSITE direction!

I then filled it and it tug went away.

Thats a bit scary that the DIFF acts like that so easilly.
But I'll just have to be more careful..

When it rains, its a REAL danger though!