I spun out in my STI.
23 April 2002, 02:22 PM
#93
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Thinking about it over the last couple of days. If the car "coasted" into a corner (I know, speed will be decreasing, but lets assume that its decreasing very very slowly) and you progressively wound-on more and more steering lock, you will eventually reach the point where one axle starts to lose grip and slide.
Come to think of it, it will almost certainly be the front axle - which results in stabilising understeer.
We try and setup the Rex to corner faster by increasing the front grip (more camber, more castor - ALK, more rear roll stiffness etc) thereby resulting in a more "neutral" and ultimately faster car round most circuits.
Can't believe that it took me 5 pages and an equal number of days to realise this - which is what we've been doing all along!
Come to think of it, it will almost certainly be the front axle - which results in stabilising understeer.
We try and setup the Rex to corner faster by increasing the front grip (more camber, more castor - ALK, more rear roll stiffness etc) thereby resulting in a more "neutral" and ultimately faster car round most circuits.
Can't believe that it took me 5 pages and an equal number of days to realise this - which is what we've been doing all along!
23 September 2003, 11:10 AM
#95
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Dave T-S, Mutant Matt and sasman...
Just to save you guys arguing over who suggested front diffs could be an issue for some... (I'd hate to see you fall out with eachother!
)
It was I who suggested front mechanical diffs wouldn't be everyones cup of tea... and argued that the car wouldn't be dangerous in the right hands... despite not being an Evo.
posted Thursday, July 13, 2000 13:04:
http://www.scoobynet.co.uk/bbs/threa...ID=3655&Page=3
I remember the evo driver telling me they didnt have helical diffs fitted... lol.
Regards,
Moray
(Guess this makes me an old timer)
Just to save you guys arguing over who suggested front diffs could be an issue for some... (I'd hate to see you fall out with eachother!
)It was I who suggested front mechanical diffs wouldn't be everyones cup of tea... and argued that the car wouldn't be dangerous in the right hands... despite not being an Evo.
posted Thursday, July 13, 2000 13:04:
http://www.scoobynet.co.uk/bbs/threa...ID=3655&Page=3
I remember the evo driver telling me they didnt have helical diffs fitted... lol.
Regards,
Moray
(Guess this makes me an old timer)
23 September 2003, 01:41 PM
#97
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Moray,
I *know* you suggested it first but as at the time, even then, it was a while ago, it was a valid comment
Well done for spotting it was an old thread too, BTW
Matt
I *know* you suggested it first but as at the time, even then, it was a while ago, it was a valid comment
Well done for spotting it was an old thread too, BTW
Matt
23 September 2003, 02:42 PM
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as to why the fronts run out of grip faster (sooner) than the rears do, i actually know the answer to that one:
look at the turning radius of both. since the car is steered by the front wheels, they are actually turning in a WIDER radius than do the rears. this is easily seen when turning through a puddle on an otherwise dry road... the front wheel's track is outside the rears.
since both ends of the car are traveling at the same angular velocity around the corner, the end of the car with the wider track experiences more centrifugal force. or, put another way (since centrifugal forces doesn't really exist) more centripetal force is necessary in the front end to keep it turning.
it is primarily due to this fact that the RWD car can theoretically get itself around a track faster than can an AWD car.
hth
ken
look at the turning radius of both. since the car is steered by the front wheels, they are actually turning in a WIDER radius than do the rears. this is easily seen when turning through a puddle on an otherwise dry road... the front wheel's track is outside the rears.
since both ends of the car are traveling at the same angular velocity around the corner, the end of the car with the wider track experiences more centrifugal force. or, put another way (since centrifugal forces doesn't really exist) more centripetal force is necessary in the front end to keep it turning.
it is primarily due to this fact that the RWD car can theoretically get itself around a track faster than can an AWD car.
hth
ken
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