Discussion
So yesterday I checked the tyre pressures. Fronts were 27 and rear 33. I put the fronts on 29 and the rears on 37. The result is now a much harder back end with some quite hard bangs going over slight undulations. I might drop them down a bit in a few days if the new harder setup annoys. I understand that if the pressure is too low then the tyre will not sit flat against the road but how can I know if I've gone too low?
ATM said:
So yesterday I checked the tyre pressures. Fronts were 27 and rear 33. I put the fronts on 29 and the rears on 37. The result is now a much harder back end with some quite hard bangs going over slight undulations. I might drop them down a bit in a few days if the new harder setup annoys. I understand that if the pressure is too low then the tyre will not sit flat against the road but how can I know if I've gone too low?
27/33 is pretty low - I haven't been that low with mine.I'm on stock suspension (265 rears), and run c.32f, c.36r (I think book is 36/42), and the ride is decent. At factory pressures, the car really isn't very nice - bounces and crashes over potholes/bumps.
Chris Stott said:
27/33 is pretty low - I haven't been that low with mine.
I'm on stock suspension (265 rears), and run c.32f, c.36r (I think book is 36/42), and the ride is decent. At factory pressures, the car really isn't very nice - bounces and crashes over potholes/bumps.
I think the standard pressures are madness. I cant understand why anyone would use those unless maybe if they were planning some high speed autobahn runs.I'm on stock suspension (265 rears), and run c.32f, c.36r (I think book is 36/42), and the ride is decent. At factory pressures, the car really isn't very nice - bounces and crashes over potholes/bumps.
ATM said:
Chris Stott said:
27/33 is pretty low - I haven't been that low with mine.
I'm on stock suspension (265 rears), and run c.32f, c.36r (I think book is 36/42), and the ride is decent. At factory pressures, the car really isn't very nice - bounces and crashes over potholes/bumps.
I think the standard pressures are madness. I cant understand why anyone would use those unless maybe if they were planning some high speed autobahn runs.I'm on stock suspension (265 rears), and run c.32f, c.36r (I think book is 36/42), and the ride is decent. At factory pressures, the car really isn't very nice - bounces and crashes over potholes/bumps.
Worth noting, I saw that the GT3 has different tyre pressures again, showing 2.2 bar (31) front and 2.5 bar (36) rear. Or at least that's what I see in the Porsche service manual in the running gear section. Can someone corroborate with an owners manual?
That'll be using sport design wheels as are on my motor, too. Granted, the wheel rate is a lot higher on the GT3 suspension, but it's food for thought.
That'll be using sport design wheels as are on my motor, too. Granted, the wheel rate is a lot higher on the GT3 suspension, but it's food for thought.
bgunn said:
Worth noting, I saw that the GT3 has different tyre pressures again, showing 2.2 bar (31) front and 2.5 bar (36) rear. Or at least that's what I see in the Porsche service manual in the running gear section. Can someone corroborate with an owners manual?
That'll be using sport design wheels as are on my motor, too. Granted, the wheel rate is a lot higher on the GT3 suspension, but it's food for thought.
I'm not sure if wheel strength should be a variable worth considering. The only variables I can think of for any given car is the weight on the wheel and the strength of the tyre. Both carcass as in the main tread area and the sidewall. I can guess that a wider tyre needs more pressure because otherwise it would deform but then again I'd guess that a wider tyre would be stiffer in its carcass to prevent this. So given say a 265 tyre and say a 285 tyre on the same car I can see an argument for more pressure on the wider tyre. But otherwise why such a difference?That'll be using sport design wheels as are on my motor, too. Granted, the wheel rate is a lot higher on the GT3 suspension, but it's food for thought.
Then we get into the realms of feel and perhaps a manufacturer such as Porsche can recommend a pressure but if this was to carry a caveat that it achieves the feel that Porsche thinks is wanted then that might make more sense. Given that n rated tyres are approved for various manufacturers I can't imagine how all of them would feel optimum with the same pressure. On the 981 Porsche recommend a pressure and then another for 'comfort'. They do state that on the comfort setting one should not drive over 125. Who the F is doing 125 regularly in this country?
Break down
I noticed a red exclamation mark lit up on the dash yesterday or possibly the day before. Then I noticed the clutch pedal not returning to it's upright position after I had depressed it, only occasionally. I thought ok I'll need to get that checked but did nothing other than pull the clutch pedal back up with my toes and carry on. Fast forward an hour or two of fun driving and I find myself doing some low speed manoeuvres which required the clutch to be pressed for a while and suddenly it does not want to return at all, even if I try to pull it up with my toes. The upshot being I can't really disengage drive and the clutch is basically useless. I looked at the brake fluid reservoir and yes it was low. I walked to a garage and bought some more fluid but it made no difference. I'd guess that it needs bleeding but I can't do that at the side of the road. So i cant drive the car. It feels like a minor break down but still it is a break down.
I noticed a red exclamation mark lit up on the dash yesterday or possibly the day before. Then I noticed the clutch pedal not returning to it's upright position after I had depressed it, only occasionally. I thought ok I'll need to get that checked but did nothing other than pull the clutch pedal back up with my toes and carry on. Fast forward an hour or two of fun driving and I find myself doing some low speed manoeuvres which required the clutch to be pressed for a while and suddenly it does not want to return at all, even if I try to pull it up with my toes. The upshot being I can't really disengage drive and the clutch is basically useless. I looked at the brake fluid reservoir and yes it was low. I walked to a garage and bought some more fluid but it made no difference. I'd guess that it needs bleeding but I can't do that at the side of the road. So i cant drive the car. It feels like a minor break down but still it is a break down.
ATM said:
Break down
I noticed a red exclamation mark lit up on the dash yesterday or possibly the day before. Then I noticed the clutch pedal not returning to it's upright position after I had depressed it, only occasionally. I thought ok I'll need to get that checked but did nothing other than pull the clutch pedal back up with my toes and carry on. Fast forward an hour or two of fun driving and I find myself doing some low speed manoeuvres which required the clutch to be pressed for a while and suddenly it does not want to return at all, even if I try to pull it up with my toes. The upshot being I can't really disengage drive and the clutch is basically useless. I looked at the brake fluid reservoir and yes it was low. I walked to a garage and bought some more fluid but it made no difference. I'd guess that it needs bleeding but I can't do that at the side of the road. So i cant drive the car. It feels like a minor break down but still it is a break down.
Look up behind the clutch pedal/is the carpet wet? If so, master cylinder.I noticed a red exclamation mark lit up on the dash yesterday or possibly the day before. Then I noticed the clutch pedal not returning to it's upright position after I had depressed it, only occasionally. I thought ok I'll need to get that checked but did nothing other than pull the clutch pedal back up with my toes and carry on. Fast forward an hour or two of fun driving and I find myself doing some low speed manoeuvres which required the clutch to be pressed for a while and suddenly it does not want to return at all, even if I try to pull it up with my toes. The upshot being I can't really disengage drive and the clutch is basically useless. I looked at the brake fluid reservoir and yes it was low. I walked to a garage and bought some more fluid but it made no difference. I'd guess that it needs bleeding but I can't do that at the side of the road. So i cant drive the car. It feels like a minor break down but still it is a break down.
Look up on the near side of the gearbox near the top of the bell housing - any signs of wetness? Slave cylinder.
I'll bet the slave seals have gone - bit of a bugger, but it happens.
bgunn said:
Speed addicted said:
You topped up the brake fluid because the clutch wasn't working?
Errr yes, before you get all mister clever arse. The clutch master cylinder and brakes are fed from a common reservoir on the 996.So to someone without intimate 996 knowledge it seems a bit of a strange thing to be doing.
Speed addicted said:
bgunn said:
Speed addicted said:
You topped up the brake fluid because the clutch wasn't working?
Errr yes, before you get all mister clever arse. The clutch master cylinder and brakes are fed from a common reservoir on the 996.So to someone without intimate 996 knowledge it seems a bit of a strange thing to be doing.
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