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Suspension consistency?

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Suspension consistency?

Post by kevhaywire on Wed Nov 26, 2008 5:03 am

Anyone pumped up their tyres with nitrogen?

I'm just looking at ways of trying to make the car feel more consistent. The differences between full and empty tank, winter and summer are a lot more noticable than I'd like!

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Re: Suspension consistency?

Post by mrbeige on Wed Nov 26, 2008 6:06 am

How will the nitrogen make a difference to tyre pressures? Does it have a different co-efficient of expansion to standard 'air'? Isn't air 70% nitrogen anyway?

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Re: Suspension consistency?

Post by kevhaywire on Wed Nov 26, 2008 7:47 am

Something to do with heat I think mate. The air in car tyres expands a lot when it gets hot, whereas Nitrogen doesn't. 100% Nitrogen is supposed to offer a consistent tyre pressure regardless of temperature.

The Nissan GTR has nitrogen filled tyres at the factory!!

Just need to find some local nitrogen filling stations!

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Re: Suspension consistency?

Post by Toad on Wed Nov 26, 2008 8:03 am

You don't have moisture inside the tyre, and Nitrogen molecules can't fit out through the rubber of the tyres or the alloy of the wheels as easily as oxygen can, helping to keep tyre pressures consistent.

To replicate this, when I refurb my speedlines I will be putting extra paint on the "inside" of the rim.
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Re: Suspension consistency?

Post by junkie on Wed Nov 26, 2008 10:15 am

I have bottles and bottles of OFN [oxygen free nitrogen] Very Happy courtesy of BOC
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Re: Suspension consistency?

Post by dirtytorque on Wed Nov 26, 2008 10:24 am

junkie wrote:I have bottles and bottles of OFN [oxygen free nitrogen] Very Happy courtesy of BOC

stealing is wrong. Smile
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Re: Suspension consistency?

Post by junkie on Wed Nov 26, 2008 10:42 am

Nooooo no no no no no no no no, all legit.
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Re: Suspension consistency?

Post by boost panda on Mon Dec 15, 2008 3:10 pm

I didn't realise that nitrogen was bigger than oxygen atomically. Even though Nitrogen is 7th in the periodic table, it's atomic radius is bigger than oxygen by 5 picometers (5x10^-12 m). Clever stuff!
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Re: Suspension consistency?

Post by jmc on Tue Dec 16, 2008 6:55 am

As Toad says it all comes down to diffusion rates. Nitrogen has a lot lower rate of permeation through vulcanized rubber than oxygen (by about a factor of 2-3), therefore it makes sense to fill tyres up with it, as you'll get less diffusion through the walls and less drop in pressure over time.... Personally I wouldn't worry about diffusion through the alloys themselves, if they were anywhere near porous as the rubber I'd be a bit concerned.
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Re: Suspension consistency?

Post by KipVR on Sat Jan 10, 2009 2:05 pm

You could just fit tyre pressure sensors, they aren't very expensive, but you do need somewhere to put the little monitor on some systems such as in the link. Somewhere there is a four LED version, I was going to see if I could mount the LED's into the disused LED bits in the guages, trouble is you have to get to the little contol box to alter the front rear threshold level, I can't find it at the moment but here are some other options....

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or these which aren't so accurate

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Re: Suspension consistency?

Post by kevhaywire on Mon Jan 12, 2009 1:46 am

I like that Smartire system!

It's one of those things though.... we've all managed without it (19 years in my case!) so far Very Happy

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Re: Suspension consistency?

Post by mic_VR on Mon Jan 12, 2009 6:54 am

Out of interest, the recommended pressures given in a car's owners manual are meant to be when the tyre is cold. Therefore I assume manufacturers have figured out a rough pressure that is reached once the tyres are warm/hot (probably within a ideal range)

If filling your tyres with Nitrogen would you want to fill to the manufacturers recommended cold pressures or would you need to work out a pressure that will be ideal for tyres that have reached an effective operating temp?

And how would you figure this out?
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Re: Suspension consistency?

Post by junkie on Mon Jan 12, 2009 9:30 am

Out of curiosity what pressures do you lot find good.

Mine are 32 psi all round, anymore on the front and it breaks traction even easier.
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Re: Suspension consistency?

Post by boost panda on Sun Feb 08, 2009 3:26 pm

I run quite high pressures on the front, but then my wheels and tyres are standard spec in all aspects. I find the car steered really badly when the tyres were low which is kinda obvious I guess.

IIRC, I run 38 on the front but then it's been a few months.
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Re: Suspension consistency?

Post by junkie on Sun Feb 08, 2009 3:47 pm

Well it even steers worse as well at higher pressure on 17's and there is a little sidewall softness that gives a little comfort back.
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Re: Suspension consistency?

Post by boost panda on Mon Feb 09, 2009 1:19 pm

mic_VR wrote:If filling your tyres with Nitrogen would you want to fill to the manufacturers recommended cold pressures or would you need to work out a pressure that will be ideal for tyres that have reached an effective operating temp?

And how would you figure this out?

Maths I'm thinking! But i'm a sums whore I love you
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