countering forces?
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Joined: Mar 2012
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From: Washington, DC
Ive heard welded differentials cause understeer. Is it possible to set enough camber in the front, to cause oversteer, which would be counteracting the understeer caused by the welded differential. *duh
-worse hypothesis is car rips in half... =P
-worse hypothesis is car rips in half... =P
Old [Sch|F]ool
Joined: May 2001
Posts: 12,848
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From: Cleveland, Ohio, USA
It is a dynamic problem.
What happens is that the car will resist turn-in until the forces on the REAR tires are high enough that the slip percentage (whether it's slip angle or acceleration/braking slip) negates the tendency to keep the car going straight.
Generally speaking, when you have a rear spool, the car will drive well when driven aggressively and keeping the tires loaded and working all of the time, but it does funny understeer/snap oversteer things when you try to drive it at a moderate pace. I don't have a spool but my clutch diff is so preloaded that it may as well be one, and driving on the street can be "curious" especially in the rain. Snowmobile-grade understeer at low lateral acceleration, think trying to make a left turn from a stoplight while stuck behind a slow driver.
My AWD car has locakble diffs and that pig will NOT turn when they're all locked, unless you can drive it aggressively, which you can't because it is severely underpowered. There's no such thing as a braking zone if you can't accelerate hard enough to need to brake before the next corner...
Giving the front more cornering bite helps somewhat but it changes other parts of the dynamic, which may or may not be beneficial depending on what other problems the car has.
What happens is that the car will resist turn-in until the forces on the REAR tires are high enough that the slip percentage (whether it's slip angle or acceleration/braking slip) negates the tendency to keep the car going straight.
Generally speaking, when you have a rear spool, the car will drive well when driven aggressively and keeping the tires loaded and working all of the time, but it does funny understeer/snap oversteer things when you try to drive it at a moderate pace. I don't have a spool but my clutch diff is so preloaded that it may as well be one, and driving on the street can be "curious" especially in the rain. Snowmobile-grade understeer at low lateral acceleration, think trying to make a left turn from a stoplight while stuck behind a slow driver.
My AWD car has locakble diffs and that pig will NOT turn when they're all locked, unless you can drive it aggressively, which you can't because it is severely underpowered. There's no such thing as a braking zone if you can't accelerate hard enough to need to brake before the next corner...
Giving the front more cornering bite helps somewhat but it changes other parts of the dynamic, which may or may not be beneficial depending on what other problems the car has.
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Joined: Jan 2003
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From: San Francisco
Camber? I doubt it. if the rear is hooked up and welded, seems like it would take ton of extra grip in the front to overcome that. In karts (where I come from) the lack of a differential is overcome with caster (not camber). Can't see how you would accomplish the same thing with a car.
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