First I want to say I have no intentions of doing this, I'm just curious. I had posted a comment on a youtube video about doing the awd to rwd by pulling the fuses and told them it only does one wheel peels. Someone said weld the differential. I'm curious what exactly that do with awd system, my friend said it would turn it into more of a drift car around corners.

 

Welding the diff will throw the system off. You should research the effects of a welded diff on a RWD car to inform yourself better. Writing the cons would lead to a huge thread.
Now on the AWD it would put throw it off and disengage the AWD leaving you on RWD and hoping everytime you turn.

A LSD would be what you would want. Issue here is LSD differentials come with a higher final drive than the AWD so you would have to match the ratio in the front to obtain the results you want.
You can still drift a G on a open diff, it just wont be as controllable as the LSD

 

I am familiar with LSD, my friend has one on a front wheel drive jetta, he said that's what got us home when he broke the axle one day. It sends the same amount of power to both wheels is how he explained it to me. I've heard a welded diff is kind of a redneck way of doing it, haven't looked into it much.

 

Nine times out of ten, it's easier and less expensive to buy the car you want (powerful RWD with a limited-slip diff), then build the car you have into the one you want. 👍

 

FWD is different, it would actually be more dangerous being that the front wheels would skip a bit as they turn because one wheel has to spin faster than the other one. The reason your friends axle broke was the welded diff. Welded diffs are great in case of a broken axle or drifting it would not leave you stranded however it's not worth doing on a daily driver or a vehicle that will see turns.

 

He broke the axle doing a burnout, we're both young and stupid. He's running a turbo setup pushing about 500whp, he left the axles weak so if something broke it would be them instead of the transmission or the engine. A lot cheaper to replace.

 

Sure, but where's the fun in that?