How Diff Setup Affects Oversteer and Understeer 

Hahaha thanks mate.

thanks for sharing, now wash your hands

Same to me :) i see so many videos trying to explain it but they never really get to the point where it is really affect our handling on cars.

No, it’s due to the setup not the lsd lol

@@itchyonion3559 coast ramp helped

Thanks ;)

No there’s not. A torsen is better. Period

Thanks for the comment mate... yeah I really tried to make the info as clear and simple as possible, rather than making it entertaining. As far as the on-throttle behaviour goes, there are so many variables that affect it that it was honestly becoming too nuanced to make a video about - basically, I don't know enough to speak with any kind of authority on the subject becuase things get rather complex. I don't have access to a real car, I can only go off what I read and experience in the simulator, and too me that wasn't conclusivive enough to make a video. But, basically, with a more locked diff on throttle, the car tends to want to turn more during the corner, as power is being tranfered to the outside wheel. This can really help get around the corner faster and also provide more traction in a straight line. However, get too liberal with the throttle mid corner and it's easier to spin. A more open diff mid corner will make it less likely to get oversteer and spin, but harder to get the power down as the inside wheel will spin. It will be easier to drive and be more stable, but less traction ultimately equals a slower car. However, I have had people swear the exact opposite of what I have just said. And, for example, on partial throttle and tight corners, a locked diff will likely cause understeer. So really it just depends on many different factors, and that can muddy the water a bit when trying to put together a clear explanation. I'd love to get in touch with a race car engineer one day to really clarify things.

@@nooch86 so nice to hear from you hear. Thanks for your attention. It really would be awesome to have a talk with an engineer, and also great content to have here on your channel. I agree with every word, i have the same sensations about it. Some opinios point to the opposite on the on power diff settings. We'll keep on learning. Thanks again 🙌

No not all lsd cause understeer. Only the 2 way diff lock fully under decel which no one use it on road course. A torsen or viscous diff act exactly like open when decelerating. However on corner entry They help you to put the power down much better than open on track.

No worries, glad you got something out of it. I don't know much about FWD, but I assume it would be similar - too much lock on entry would cause understeer, too open on power causes inside wheel spin and understeer.

Thanks. I would, but I don't have near enough knowledge for that kind of vid, even doing this one was a stretch for me.

@@nooch86 ok. This one is good with good examples

Cheers mate.

I'm not really an expert on all-wheel drive systems or torsen diffs, and things can get pretty complex when talking about anything to do with setups, but if I were to have a guess, I'd say that it would mostly depend on the torque bias ratio of the torsen diff (essentially, how much torque imbalance between the left and right wheels can occur before the diff locks them together). If the torsen diff is set up to have a lot of lock between the two sides, then for sure I think that on corner entry the car with the torsen diff will have LESS oversteer than the car with the open diff (i.e it will be more stable on corner entry). However, on corner exit, the car with the open diff would understeer more than the car with the torsen, becuase it would just spin the inside wheels and be unable to send power to the outside tyre (which has the most traction due to weight transfer). And this is basically the reason you want a torsen diff or any diff that can give you some lock between the inner and outer wheels - when you apply power, you want that power to be able to go to the outer wheel (the wheel with all the grip), so you can accelerate during very hard cornering. BUT accelerate too hard and you'll get wheel spin on that outer tyre (provided you have the power) and that will result in a lot of oversteer. Basically, if you want to be able to accelerate mid corner (during hard cornering), you need a diff that sends power to the outside wheels (or else the inside wheels just spin and you go absolutely nowhere).

Nooch 86 Thank you so much for the explanation. So the major difference would be the possibility to apply throttle after the apex, is that right? Assume if a car with open diff make a tighter line in corner entry and straighten the steering earlier then apply full throttle, would it have similar speed comparing to the same car with LSD doing wider line and apply throttle earlier? Is open diff always have disadvantage in lap time under any circumstances? Thank you for your insights!

I'd say the main difference in this situation is to be able to apply more power to the road while cornering, yes. "Assume if a car with open diff make a tighter line in corner entry and straighten the steering earlier then apply full throttle, would it have similar speed comparing to the same car with LSD doing wider line and apply throttle earlier?" The problem with taking a tight line on corner entry is that you loose a lot of corner exit speed. If you take a wider line and apex later, you'll generally carry more speed onto the next straight. But again, everything has it's place, and each corner dosn't always have one pefect line, sometimes there is a different line that's better/worse for different cars and driving styles. But I'd say that in any given situation, the car with the LSD will most likely come out on top. A diff that has enough slip to allow the car to rotate/turn in, but enough lock to get the power down on exit, will always beat the car with a fully open diff. But hey, this is why simulators are so great... find a mod with a 4WD system and adjustable diffs, and do a whole bunch of laps at different settings and compare the difference. You don't have to be an F1 team to use a simulator to help you with car set up!

@@nooch86 Torsen diff doesn’t lock under deceleration at all. It also helped you put the power down much better than open diff. A torsen diff is simply better than open diff on the track.

@@b.s.6980 no the torsen diff doesn’t lock under deceleration at all . On a rwd car with decent hp. A diff is just better than open.

Not sure but it is possibly a similar story. All I know for certain is that on power lock pulls you through the corner and makes a huge difference.

Cheers Spinelli.

I think generally yes. However lets just say you were on a very tight circuit (tight radius corners) and you had a fully locked diff on power... that could potentially cause understeer. I'd have to do some testing though, I'm no expert.

@@nooch86 Sure thing. I had high speed corners in mind but you brought up a good point about low speed corners. For me it's easier to visualize an open diff as your weight goes to the outside, most of the power will go to the inside wheel therefore I'd assume it will create more of an understeer. I tested it on a couple of games but I thought it didn't make as much of a difference as coast diff so I can't make any conclusions.

@@philanderadriaan then track the car in rear world you will understand that open diff is just trash

Totally forgot to credit the music thanks for letting me know. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-85bkCmaOh4o.html

Although what I've said does somewhat translate to real life, my videos are mostly aimed at a sim racing audience. With sim racing it can be a bit harder to feel the effects of certain setup changes, and though it's obvious to most that diff setup is important, the effects of various setup changes might not be immediately apparent due to the lack of sensory input compared to real life.