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 Post subject: Re: Foot Pump
PostPosted: Mon Dec 03, 2018 5:16 pm 
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This is really strange. Set the fronts to 29 PSI and rears to 36 PSI according to foot pumps digital gauge then went away for 15 minutes, when I came back I connected the foot pump up again and it was saying 31 PSI front 38 PSI rear.

So I let some air out until it went down to correct values according to foot pumps digital gauge. Then used my old digital pressure gauge to check. Rear right was 35.5 PSI.

I had noticed before that the seperate digital pressure gauge read 1.5 PSI over when it was supposed to be accurate to within 0.5 PSI. I am now thinking that the seperate digital pressure gauge is more accurate than I thought and I should use that.

We're still only talking 2 PSI over even if the foot pumps gauge is initially over reading the pressures. I'll have to keep tabs on this.

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Current 2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84hp

Soon 2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
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 Post subject: Re: Foot Pump
PostPosted: Tue Dec 04, 2018 2:59 pm 
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Well I have found out the best way to do this... firstly check tyre pressure with separate pressure gauge to get a base reading. Then connect foot pump and get a reading on that to see if it corresponds.

Then inflate tyre as necessary until it reads the desired pressure on the foot pump and disconnect. Finally check again with separate digital pressure gauge to see if it corresponds.

I did this just now and they all correspond, with the separate digital pressure gauge being 0.5 PSI under the foot pumps reading which I presume is very accurate.

If it ever wants me to overinflate by 2 PSI in future I'll notice it straight away.

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Current 2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84hp

Soon 2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
Sat Nav/DAB Radio
Cabrio Roof
twinamic 6-speed dual clutch transmission
White Bodypanels & Black Tridion
15” Alloy Wheels


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 Post subject: Re: Foot Pump
PostPosted: Tue Dec 04, 2018 8:20 pm 
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nlel wrote:
Well I have found out the best way to do this...



FINALLY!!!!! It’s olny taken you 6 years of constantly droning on about this, but I’m glad you have finally master tyre pressure!

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 Post subject: Re: Foot Pump
PostPosted: Wed Dec 05, 2018 6:37 am 
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wee mac wrote:


FINALLY!!!!! It’s olny taken you 6 years of constantly droning on about this, but I’m glad you have finally master tyre pressure!


No need to be so bitchy my man!

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Current 2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84hp

Soon 2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
Sat Nav/DAB Radio
Cabrio Roof
twinamic 6-speed dual clutch transmission
White Bodypanels & Black Tridion
15” Alloy Wheels


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 Post subject: Re: Foot Pump
PostPosted: Mon Jan 07, 2019 11:34 pm 
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got tesco cheapo 10 quid electric pump. works great, fast and been reliable for 2 years now. i use it to pump up tyres in all 4 cars. saves 50p at the petrol station.


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 Post subject: Re: Foot Pump
PostPosted: Mon Jan 28, 2019 3:14 pm 
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Drives: C1Vibe5dr1.0 2008
Just use the same Decathlon cycle track pump that gets used for the bikes - reads reasonably accurately compared to my free standing gauge. I'm not too worried about the odd PSI here and there - it's more important that they are checked regularly.


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 Post subject: Re: Foot Pump
PostPosted: Mon Jan 28, 2019 3:47 pm 
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With my foot pump I just inflate to the desired amount according to the foot pump ie 29 PSI front 36 PSI rear then check again with my separate digital pressure gauge and if that reads 28.5 PSI front 35.5 PSI rear I am satisfied.

I have found the foot pump to read 0.5 PSI higher than separate digital pressure gauge, but in any case I don’t need to be that accurate as long they are within 1 or 2 PSI of correct values is fine.

It’s more important to check them often to make sure they don’t go 2.9 PSI or above under inflated.

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Current 2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84hp

Soon 2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
Sat Nav/DAB Radio
Cabrio Roof
twinamic 6-speed dual clutch transmission
White Bodypanels & Black Tridion
15” Alloy Wheels


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 Post subject: Re: Foot Pump
PostPosted: Mon Jan 28, 2019 6:32 pm 
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Location: South Molton
Drives: 2008 Citroen C1 Code
I use a Halfords digital pump set to 2.25 bar, that allows for the slight loss in pressure as I unscrew it from the valve so the tyres end up inflated to 2.2 bar.

Then I screw onto the valve the tyre pressure monitors I have (Tyre Dog) which continuously monitors the pressure and temperature of all 4 tyres onto a small monitor which I have fixed onto a phone bracket next to the radio.

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 Post subject: Re: Foot Pump
PostPosted: Mon Jan 28, 2019 6:57 pm 
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I find I lose very little when unscrewing the foot pump from the valve certainly not as much as 0.5 PSI. I can see this if I overinflate a tyre then unscrew the foot pump until it’s letting air out.

I can see it takes a while for it come down on the foot pumps display from say 33 PSI to 32.5 PSI. Quite a lot of air has to be lost, certainly more than what is lost while unscrewing it completely.

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Current 2007 Smart Fortwo Passion Coupe C451 Turbo 999cc 84hp

Soon 2019 Smart Fortwo Prime Premium Cabrio A453 Turbo 900cc 90hp
Sat Nav/DAB Radio
Cabrio Roof
twinamic 6-speed dual clutch transmission
White Bodypanels & Black Tridion
15” Alloy Wheels


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 Post subject: Re: Foot Pump
PostPosted: Tue Jan 29, 2019 3:02 am 
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Joined: Sun May 06, 2012 4:19 pm
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Drives: 2006 C1
I have just bought 4 things l screw onto the valves they stay green when the pressure is correct and slowly change colour as the air deflates.
Problem is they have not maked what pressure they are for. And over the lnternet l can't get them
to understand what l mean.


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