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Originally Posted by Sirbelch
Ok, so I'm getting back on the throttle smoothly but quickly coming out of a corner. The car starts to push until the outside front tire is loaded enough for the LSD to kick in and send power to the outside front wheel. When that happens, the car stops pushing and accelerates off the corner in the line i intended it to take. My old GSR with an open diff would only push coming out of a corner. So how does the LSD cause understeer? Everything i ever read said an LSD would help eliminate understeer.
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True an LSD can help with corner exit acceleration, but they also tend to add to "throttle induced" understeer on corner exit as well. I should have gone into more detail with my last post sorry.
"For example, Take an open Diff FWD car accelerating out of a turn. The outside tire is heavily loaded (lots of traction) and the inside tire is lightly loaded (very little traction). In this instance the outside front is using 99% of its avalible traction making the car turn. Once the driver starts adding in throttle, thanks to the open diff, the front inside ends up getting most of the power = possible inside wheel spin, the outside gets a small fraction of power, and has to split its avalible traction between cornering and accelerating.. so you get a little more push and not much acceleration.
Add in an LSD... same instance as above, inside lightly loaded, outside heavy load... except in this case, thanks to the LSD, as the driver adds in throttle, the LSD now forces a lot more of the cars power to the tire thats heavliy loaded and not much to the tire thats lightly loaded... SO, now the front outside tire loses a substantial amount of the traction it was using to make the car turn in order to use it for acceleration, and the inside tire doesnt spin... So you've reduced/eliminated inside wheel spin and increased your rate of acceleration out of turns at the cost of increasing the amount of throttle on understeer the car has...
This only gets worse as you increase the effectiveness of the front anti-roll bar. Because the anti-roll bar effectivly increases the load on the outside front and decrease it more on the inside front... which means the car is relying even MORE on that outside front tire to make the car turn, and any loss in cornering traction in favor of acceleration = more push."