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#532899 - 14/09/18 02:13 PM Tyre Pressure when Hot
Peter J Offline
Formerly known as Aldermog
Member of the Inner Circle

Registered: 13/08/13
Posts: 10592
Loc: Salisbury, UK
I set the MP4 S to 24 psi, as I'd had the ZZ3s.
For no good reason after getting home today I checked the pressures hot, all were up 5 psi... and the tyre body was noticeably warm.

The ZZ3s never warmed up, even 7 hard (for me) laps of Castle Coombe didn't get them more than slightly warm.

Question to those who know more.. should I set cold pressure lower, say 22 psi, given how easily there MP$ S heat up?
_________________________
Peter,
Tarka the 'Otter Mog
2014 Plus 8



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#532903 - 14/09/18 02:47 PM Re: Tyre Pressure when Hot [Re: Peter J]
Graham, G4FUJ Offline
Salty Sea Dog
Member of the Inner Circle

Registered: 03/07/07
Posts: 21093
Loc: Cheltenham, Glos. UK
I would try up a couple of psi Peter. I suspect a lot of the heat is due to sidewall flexing more than it should?
A tyre that is below manufacturer advised pressure (perhaps slow puncture) will heat up more than a tyre at correct pressure.
_________________________
Graham (G4FUJ)

D8921 L44FOR '93 4/4 Sunny yellow 2 seat smile
'90 LR 90 SW
'07 MINI Cooper

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#532909 - 14/09/18 03:33 PM Re: Tyre Pressure when Hot [Re: Graham, G4FUJ]
Peter J Offline
Formerly known as Aldermog
Member of the Inner Circle

Registered: 13/08/13
Posts: 10592
Loc: Salisbury, UK
Good point: the sidewalls are, compared with the ZZ3s, far more flexible. So 26 all round and then see what they go up to?

Also, whilst the Sticker Plate in the car says 25 all round the Aero 8 is listed as 29 all round. So I think 26 is a good starting point.
_________________________
Peter,
Tarka the 'Otter Mog
2014 Plus 8



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#532910 - 14/09/18 03:43 PM Re: Tyre Pressure when Hot [Re: Peter J]
Alistair Offline
Smile, it confuses them
Charter Member

Registered: 18/03/09
Posts: 5060
Loc: Hampshire
If you watch the tyre pressure sensors in the MB you will notice quite a change in pressure from stationary to exercising with vigour.

The last few mornings have been cooler so a good blast will see them going up during the drive. I would expect to see +3-4 normally unless I really push when it will go up +4-6. Mostly hard braking and pushing on heats them up from my experience.

I would not drop pressure for general road use as under-pressure is more dangerous.

If you are track bound it is a little more sensible to drop them a little prior to going out knowing that the work will increase them. Then check them after a few sighting laps, without using the handbrake in the pits to avoid smokey moments. Ahh the smell of burning pads, yum.
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Is it true ? I just have to pop out to the garage and check again, see you in an hour (or three)

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#532916 - 14/09/18 04:17 PM Re: Tyre Pressure when Hot [Re: Peter J]
milligoon Offline
Talk Morgan Expert

Registered: 20/04/14
Posts: 2869
Loc: Dorset, UK
Peter, we could set up your tyres buy use of my FLIR camera, Yeh I finally have a cool geeky use for it wink

Oh yes if they are stickier tyres then they will get hotter anyway.

Need to see if your current pressures are causing any issues under/over pressured etc which will lead to premature wear.
_________________________
Mark - driving
Archie the Old English Sheep Mog...........
2010 Roadster 3.0 V6 (S3) wink

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#532919 - 14/09/18 04:55 PM Re: Tyre Pressure when Hot [Re: Peter J]
Gareth H Offline
Just Getting Started

Registered: 29/07/18
Posts: 67
Loc: Salisbury Plain
Peter, all normal, I'd stick with the correct pressures, you could maybe adjust by a couple of psi to change the balance front to rear.
That's jogged my memory, I've got a flir camera for an android phone that is still boxed, if anybody would be interested?
G
_________________________
Gareth
Aero 8
R Nine T
335d
BMW Power!

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#532931 - 14/09/18 06:24 PM Re: Tyre Pressure when Hot [Re: Peter J]
Shooter Offline

Has a lot to Say!

Registered: 06/09/07
Posts: 1414
Loc: Oreton, Shropshire
I though Aero tyres were 25 all round? or maybe that's just the 18's.
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Aero 8 GTN. #10
Aero 8 S5.... #10

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#533106 - 16/09/18 02:47 PM Re: Tyre Pressure when Hot [Re: Peter J]
AeroIan Offline
L - Learner Plates On

Registered: 09/07/16
Posts: 228
Loc: N.Ireland
On this trip I have 25 when starting (Pirelli rosso) but it is SO warm they are getting to about 30 and I do think the handling is slightly affected
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Aero-Ian

Aero 8 Series 1
BMW M140i
2003 Defender 90
BMW 330d M Touring

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#533108 - 16/09/18 03:52 PM Re: Tyre Pressure when Hot [Re: Peter J]
aerotaff Offline
Has a lot to Say!

Registered: 12/01/07
Posts: 1264
Aerolan.

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#533110 - 16/09/18 04:01 PM Re: Tyre Pressure when Hot [Re: Peter J]
aerotaff Offline
Has a lot to Say!

Registered: 12/01/07
Posts: 1264
Aerolan. I also run rossos 25 cold and they increase to about 28 hot , so not too far off.I disconnected the morgan gauge when i got the car it was always very intermittent constantly running low compared to a manual gauge.


Em

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