Tyre pressures xtreme

[Michael Aitken]

Hi what are people running tyre pressure wise on xtreme with black top zetec on 15"wheels? Thanks

[Steve Kodź]

I'd experiment with pressures between 18 and 22psi.

Regards,
Steve

On 28/03/2019 19:38, 'Michael Aitken' via Quantum Owners Group wrote:
> Hi what are people running tyre pressure wise on xtreme with black top zetec on 15"wheels? Thanks
>

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[robert greig]

For some reason I thought mine is 26 psi.. 

I will have to check them.. 

Sent from Yahoo Mail on Android

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[Chris Young]

going back to when I had my xtremes - i was down as low as 15. 

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[Michael Aitken]

Thanks Steve was thinking around that will try 18 on front and 20 on the back and see how I get on.

[Clem Robertson]

I agree with Steve.

Depending on tyre size, brand and load rating you may have to run very low pressures to get grip. My original Bridgestone tyres seem to work best at around 19 psi but the present tyres seem to need lower pressures.

Clem

On Fri, 29 Mar 2019, 12:47 'Michael Aitken' via Quantum Owners Group, <quantu...@googlegroups.com> wrote:

Thanks Steve was thinking around that will try 18 on front and 20 on the back and see how I get on.

[Susan and Martin Scott]

Many years ago there was a similar question about Calvy Mitchel kit cars (I have one). I just set the pressure 'so the bulge looked correct' which happened to be 19psi (on my gauge). Someone in the club who worked at Dunlop put lots of numbers in a computer and came up with the same figure!

One thing to bear in mind is that unless you have a very expensive calibrated gauge all you can hope for (as long as it gets repeatable results) is that it's the same pressure each time with that gauge. Whatever gauge you are using it's best to keep an eye on the tyres for any uneven wear, and (as long as the suspension is otherwise all ok ) adjust the tyre pressure accordingly. It may be for your gauge that a reading of 22 psi may be good. At lower pressures the gauge inaccuracies are also likely (than at higher pressures). It's best to get the pressures 'correct', but with most kit cars (even if the tyres wear quicker than expected) the low mileage will mean the tyres have to be changed before they are worn out anyway.

Martin

 

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[Robert Craig]

Here is a trick I learnt years ago. 

Set the tyre pressures to what you think they might be and keep a note. Take the car for a spirited 10 minute run. Recheck the pressure, if they have risen by more than 2 psi, the pressures are too low. If they haven't risen, they are too high. Repeat the process until you get a rise of 1-2 psi after the run. This should be the optimum pressure. 

Bob

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[Susan and Martin Scott]

That sounds like a err.... sound idea :-)

[Mark Alford]

Thanks for this really useful info...
My build manual recommended 26 for road and 24 for race. I have been setting to 24 for road use and have found them a bit hard, will reduce now, I'll try 20 first.
Cheers
Mark

[Mark Alford]

Hi Michael,
We met at StoneLeigh, my yellow Xtreme was next to yours...
I forgot to say if you want 2 drain plugs for your boot, just let me know. I have plenty spare, I can post them to you. The tubing I bought from B&Q
Cheers
Mark

[Michael Aitken]

Hi Mark that would be great my address is 17 carribber Avenue
Whitecross
Linlithgow
EH49 6JS

That's one of the jobs on the to do list!

Thanks
Michael

[Mark Alford]

they'll be in the post this week...