*** P S M is great ***
Discussion
framps said:
mine has it, never noticed it kicking in (obviously I'm a great big wus and don't drive it hard enough) what happens?
Well you know when you're taking the piss and you're expecting it to break away? That's fine. But when you're NOT arsing around, NOT trying to apply too much pressure, are concentrating, but coming off a roundabout and slightly laying on the power (KayC will tell you, I don't have much of it
) and you come across some grease (or diesel), the rear breaks away without any warning at all and just as you're brain's registering it, PSM says "WOAH! You f**ked up there matey. I've got it, let me just pull that rear back in for you. There we go. Have a nice day!", and you blink and wonder why the arse of your P & J isn't in the wall, why your intervention is not required, and how it is you're merrily continuing on your way. It detected a spin incredibly quickly and braked the individual wheels in a way the driver can't to straighten the car back up. Absolutely brilliant! And it's not even an option!!
Big thumbs up over here
Now, where can I buy new pants and get rid of that smell...?
pikey said:
But when you're NOT arsing around, NOT trying to apply too much pressure, are concentrating, but coming off a roundabout and slightly laying on the power (KayC will tell you, I don't have much of it
) and you come across some grease (or diesel), the rear breaks away without any warning at all and just as you're brain's registering it, PSM says "WOAH! You f**ked up there matey. I've got it, let me just pull that rear back in for you. There we go. Have a nice day!", and you blink and wonder why the arse of your P & J isn't in the wall, why your intervention is not required, and how it is you're merrily continuing on your way. Did you lift off? I heard you need to keep the power on otherwise PSM goes 'oh well bugger it, hit the wall if you want' Any suitably knowledgable engineery types know the finer points (I promise not to ridicule your beards)
Edited by framps on Thursday 5th October 17:06
framps said:
I heard you need to keep the power on otherwise PSM goes 'oh well bugger it, hit the wall if you want' Any suitably knowledgable engineery types know the finer points (I promise not to ridicule your beards)
Absolutely not. You hear a lot of scuttlebutt and nonsense about PSM. Driving enthusiasts tend to be natuarally suspicious of electrickery, I suppose, but PSM doesn't ever abandon the car/driver to the wall...
PSM works by using a number of sensors:
The ABS "slip" sensors to detect if any wheel is slipping.
Steering wheel position.
It has a rather interesting "directional" sensor (loads of ball bearings in tiny little spheres) that works out which way the car is travelling.
That lot gets fed into a computer...the "PSM" computer.
The PSM computer then works out which way the car is going...and which way it should be going. Given this it can brake individual wheels to swing the car back around to its intended direction. It can also "feather" the throttle - as that is electronically controlled as well.
Its an amazing, amazingly effective system. The way it grabs a slide and puts it right is quite incredible. And if you *want* to slide you can switch it off...
If its all going Pete Tong, it won't let you lift off. That's why PSM cars are 'throttle by wire' and don't have a throttle cable. It can keep enough power on to sort things out, even if you have now crossed your legs and assumed the 'brace' position.
Piling into a wet roundabout, too fast, standing on the brakes is good fun too. You can feel it braking on both right hand wheels, pulling the car round the corner. Most other cars would be on a flat bed pickup, shortly after this. Then, if its got four wheel drive, you nail and are gone again.
PSM is very clever stuff and I would not be without it.
The caveat on turning it off is that if you do something really stupid, like braking hard mid bend, it will turn itself on again. It would be apt for a it to flash up the C word on the display, at this point
Piling into a wet roundabout, too fast, standing on the brakes is good fun too. You can feel it braking on both right hand wheels, pulling the car round the corner. Most other cars would be on a flat bed pickup, shortly after this. Then, if its got four wheel drive, you nail and are gone again.
PSM is very clever stuff and I would not be without it.
The caveat on turning it off is that if you do something really stupid, like braking hard mid bend, it will turn itself on again. It would be apt for a it to flash up the C word on the display, at this point
DucatiGary said:
ok then its agreed, when I plow mine into a wall its becuase I aint got PSM, cheers guys
cheers guys 
Wait till the slush comes out to play... You're just about to get ready to correct the slide and that nice PSM chappie comes along and does it for you. It's good on a C2 but unbefrikkinleiveable in a C4 when it's greasy.
BliarsGoing said:
DucatiGary said:
ok then its agreed, when I plow mine into a wall its becuase I aint got PSM, cheers guys
cheers guys Wait till the slush comes out to play... You're just about to get ready to correct the slide and that nice PSM chappie comes along and does it for you. It's good on a C2 but unbefrikkinleiveable in a C4 when it's greasy.I hear BMW offer a similar system that uses kinematics and Saxos. Clever those Germans.
I turn it off at the track but its ALWAYS on on the road. It has save my ass a couple of times and I mean saved because at least in one of them I'd probably couldn't get away with it partially because I can't apply brake pressure on seperate wheels. Has you lot proabably have noticed all cars but specially a 911 has different handling caracteristics weather you're going uphill or downhill assuming the exact same turns, going uphill acentuates understeering and downhill acentuates oversteering thsi has to do with the weight distribuition over the axles and thats why you play with ride height to sort a cars handling. The story is very short: a large and steep (going down) 90º lefthander approached at very high speed and the back stepped out so quickly (I wasn't expecting) and the wall is so close that if wasn't the PSM I'd be hitting the wall.
Don said:
framps said:
I heard you need to keep the power on otherwise PSM goes 'oh well bugger it, hit the wall if you want' Any suitably knowledgable engineery types know the finer points (I promise not to ridicule your beards)
Absolutely not. You hear a lot of scuttlebutt and nonsense about PSM. Driving enthusiasts tend to be natuarally suspicious of electrickery, I suppose, but PSM doesn't ever abandon the car/driver to the wall...
PSM works by using a number of sensors:
The ABS "slip" sensors to detect if any wheel is slipping.
Steering wheel position.
It has a rather interesting "directional" sensor (loads of ball bearings in tiny little spheres) that works out which way the car is travelling.
That lot gets fed into a computer...the "PSM" computer.
The PSM computer then works out which way the car is going...and which way it should be going. Given this it can brake individual wheels to swing the car back around to its intended direction. It can also "feather" the throttle - as that is electronically controlled as well.
Its an amazing, amazingly effective system. The way it grabs a slide and puts it right is quite incredible. And if you *want* to slide you can switch it off...
cheers Don. Will have to give it a go on a wet sunday in tescos car park.
Now if only it could steer 'framps' said idiot newbie porker driver and say in a german accent. Ah for pities sake, vat are you tinkin you blardy idioot. I vish I had a turbo and I'd keel you properly.
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