Nitrogen in tyres in New Porsche’s?
Discussion
Nitrogen in new car tyres?
It is now a Porsche standard to fill tyres with nitrogen when fitting new tyres. All OPCs have had to install the equipment to do this,
Does anybody know if this extends to tyres fitted as new at the factory?
If I want the benefits of nitrogen filling on a new car (much less pressure increase with track use) do I have to pay to get them nitrogen filled or are they nitrogen filled already?
My OPC doesn’t know.
It is now a Porsche standard to fill tyres with nitrogen when fitting new tyres. All OPCs have had to install the equipment to do this,
Does anybody know if this extends to tyres fitted as new at the factory?
If I want the benefits of nitrogen filling on a new car (much less pressure increase with track use) do I have to pay to get them nitrogen filled or are they nitrogen filled already?
My OPC doesn’t know.
Wollemi said:
My OPC doesn’t know.
Can't they measure a new car?If they don't have a tool to measure nitrogen content in a tyre, why would you trust them to fill them with nitrogen?
https://www.ebay.co.uk/i/352073005551
But basically, this is snake oil.
The reduction in water vapour to prevent / reduce corrosion and the reduction in leakage rate are real physical things though how much a difference they make is for you to make your own mind up vs the cost.
All gases obey PV = nRT the same way.
There will be no measurable difference in the way a solely Nitrogen filled tyres react to temperature increases, compared to one filled with 78% Nitrogen, given the rest of constituent parts of "air". So unless you're looking for 0.0001s off your lap time, you're probably better off losing a kg in personal body mass to achieve a greater impact.
All gases obey PV = nRT the same way.
There will be no measurable difference in the way a solely Nitrogen filled tyres react to temperature increases, compared to one filled with 78% Nitrogen, given the rest of constituent parts of "air". So unless you're looking for 0.0001s off your lap time, you're probably better off losing a kg in personal body mass to achieve a greater impact.
I did it for a while many years ago and could see no difference. As stated above’ losing a few pounds is more effective , but the real difference fir me alone always was to improve skill. I almost always use an instructor on a new track or a track I have not visited for a long time, plus lots of GT4 to get visual memory.
I am sure there is some difference at a level of perfect setup and very high skill.
I am sure there is some difference at a level of perfect setup and very high skill.
My OPC started using nitrogen to fill tyres a few years ago, and after then I found several things.
Tyre pressures stayed correct for significantly longer. I rarely had to top them up.
At track days, the increase in pressure as the tyres got hot was hugely reduced, so much so that if I only did 20 minute sessions then there was no need to let the tyres down.
I do realise that this is all because the nitrogen is dry rather than air which has water vapour in, but the benefits were very real to me.
Tyre pressures stayed correct for significantly longer. I rarely had to top them up.
At track days, the increase in pressure as the tyres got hot was hugely reduced, so much so that if I only did 20 minute sessions then there was no need to let the tyres down.
I do realise that this is all because the nitrogen is dry rather than air which has water vapour in, but the benefits were very real to me.
drgav2005 said:
They'll be at least 78% full of Nitrogen as standard. Knowing Porsche, the additional 22% will be an expensive upgrade ??
Porsche Workshop Nitrogen Delivery£2000 + VAT
Porsche Workshop Nitrogen Delivery + Carbon Nozzle Technology (Delivered via Carbon Fibre Nozzle, by a certified Porsche Master Tech)
£4750 + VAT
There was a push for Nitrogen use a few years back - the kit was installed and even had 4 hoses that would be connected to the car and, in answer to the last question; yes, the tyres would be deflated and reinflated a total of 4 times to ensure full 'air' removal. The system no longer resides on the premises.
If it's become a requirement nobody told me!!
In response to the OP; no, the cars do not come through with Nitrogen in the tyres - a tell was/is, the fitting of green valve caps when the tyres have it.
If it's become a requirement nobody told me!!
In response to the OP; no, the cars do not come through with Nitrogen in the tyres - a tell was/is, the fitting of green valve caps when the tyres have it.
Edited by Pope on Sunday 9th August 22:12
ChocolateFrog said:
I assume they pull a vacuum before filling them, or do they ignore the several litres of normal air already in the tyre?
If they did this, isn't there a risk they'd unseat the tyres? Back to square one again if that did happen. I believe nitrogen has larger molecules than oxygen, which might explain why tyres 'filled' with it do not need their pressures topped up as much. I say filled as there'll still be a good % of O2 in a tyre, just a higher % of N2 than normal.
mikecassie said:
ChocolateFrog said:
I assume they pull a vacuum before filling them, or do they ignore the several litres of normal air already in the tyre?
If they did this, isn't there a risk they'd unseat the tyres? Back to square one again if that did happen. I believe nitrogen has larger molecules than oxygen, which might explain why tyres 'filled' with it do not need their pressures topped up as much. I say filled as there'll still be a good % of O2 in a tyre, just a higher % of N2 than normal.
1 Bar= 14.7 PSI, so if you (say) inflate a deflated (1 Bar) tyre with N2 to 2 Bar (~30 PSI) , you've effectively halved the % of non-N2 gas in the tyre.
Each successive deflation/reflation halves it again so after four N2 fills you'd be at about 98%+ pure N2. (100 - 22/16)
Does that sound right?
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