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+8 tyre pressures #547903
13/12/18 06:32 PM
13/12/18 06:32 PM
Joined: Jul 2016
Posts: 54
Cambs., UK
A
Almond Offline OP
Just Getting Started
Almond  Offline OP
Just Getting Started
A

Joined: Jul 2016
Posts: 54
Cambs., UK
Apologies if this has been done to death but what tyre pressure do people run on recent +8s? I'm new to the +8 and I've been using it at 2.2 bar (32 psi) since I collected it from Krazy Horse in the summer. The car is on 245/40 R18 Yokohama Advans and ride comfort was not too bad so I've only now got round to checking it (I know I know .. probably should have done it before..)
The manual says 25 psi (1.7 bar) but presumably it was set at 32 psi for a reason. 32 psi strikes me as high (low mass car and relatively wide footprint etc) but as the ride comfort was not too bad maybe thats right. Who knows? Certainly not me! and I would appreciate any feedback based on personal experience.

Thanks guys.


Ian
now +8 and ex-ARP4 (weeps quietly)

A convert to the joy of Morgans after years of motorcycles
Re: +8 tyre pressures [Re: Almond] #547904
13/12/18 06:33 PM
13/12/18 06:33 PM
Joined: Jul 2016
Posts: 54
Cambs., UK
A
Almond Offline OP
Just Getting Started
Almond  Offline OP
Just Getting Started
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Joined: Jul 2016
Posts: 54
Cambs., UK
PS: ARP4 now changed for the +8 Speedster so sorry for confusing sign off. I'll change it.


Ian
now +8 and ex-ARP4 (weeps quietly)

A convert to the joy of Morgans after years of motorcycles
Re: +8 tyre pressures [Re: Almond] #547909
13/12/18 07:09 PM
13/12/18 07:09 PM
Joined: May 2012
Posts: 112
J
John Winn Offline
L - Learner Plates On
John Winn  Offline
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J

Joined: May 2012
Posts: 112
I have always run my Speedster at 25 psi.

Last edited by John Winn; 13/12/18 07:58 PM.
Re: +8 tyre pressures [Re: Almond] #547915
13/12/18 07:43 PM
13/12/18 07:43 PM
Joined: Mar 2009
Posts: 5,979
Hampshire
Alistair Offline
Smile, it confuses them
Alistair  Offline
Smile, it confuses them
Charter Member

Joined: Mar 2009
Posts: 5,979
Hampshire
I run my Series 2 Aero at 25 front and 26 back on Mich PSS.


Just time to burn a little more petrol before dinner.
Re: +8 tyre pressures [Re: Almond] #547921
13/12/18 08:22 PM
13/12/18 08:22 PM
Joined: Jul 2016
Posts: 54
Cambs., UK
A
Almond Offline OP
Just Getting Started
Almond  Offline OP
Just Getting Started
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Joined: Jul 2016
Posts: 54
Cambs., UK
Many thanks for the quick feedback John, Alistair. 25 psi it is then, with maybe a bit more at the back when with luggage etc.


Ian
now +8 and ex-ARP4 (weeps quietly)

A convert to the joy of Morgans after years of motorcycles
Re: +8 tyre pressures [Re: Almond] #547931
13/12/18 09:17 PM
13/12/18 09:17 PM
Joined: Dec 2017
Posts: 188
Colorado, USA
B
britmog Offline
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britmog  Offline
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Joined: Dec 2017
Posts: 188
Colorado, USA
I have always run my 1994 +8 at 22 psi both front and back. Found this pressure to give the correct handling and ride comfort for me especially on the twisty mountain roads here in Colorado.

I would try different pressures between 22 - 26 psi and see which you prefer.


Bruce Marshall
1964 4/4 Series V Comp (Megan)
1994 +8 (Maurice)
2013 M3W (Olga)
Re: +8 tyre pressures [Re: Almond] #547934
13/12/18 09:37 PM
13/12/18 09:37 PM
Joined: Sep 2009
Posts: 3,879
Cologne, Germany
Heinz Online content
Talk Morgan Addict
Heinz  Online Content
Talk Morgan Addict

Joined: Sep 2009
Posts: 3,879
Cologne, Germany
And with only a small difference between front and rear you can adjust the wanted degree of oversteer or understeer very well.

Re: +8 tyre pressures [Re: britmog] #547983
14/12/18 10:03 AM
14/12/18 10:03 AM
Joined: May 2007
Posts: 918
Walsall, uk
R
robmog88 Offline
Talk Morgan Regular
robmog88  Offline
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R

Joined: May 2007
Posts: 918
Walsall, uk
Agree 22 all round on Toyo proxes

Re: +8 tyre pressures [Re: robmog88] #547984
14/12/18 10:22 AM
14/12/18 10:22 AM
Joined: Jul 2007
Posts: 22,390
Cheltenham, Glos. UK
Graham, G4FUJ Offline
Salty Sea Dog
Graham, G4FUJ  Offline
Salty Sea Dog
Member of the Inner Circle

Joined: Jul 2007
Posts: 22,390
Cheltenham, Glos. UK
Originally Posted By britmog
I have always run my 1994 +8 at 22 psi...

Originally Posted By robmog88
Agree 22 all round...


One slight problem with those answers - the OP is requesting pressures for the Aero (ally chassis) based Plus 8, not a trad/classic. The tyres on the Aero Plus 8 are more like rubber bands. smile


Graham (G4FUJ)

D8921 L44FOR '93 4/4 Giallo Fly 2 seat smile
'90 LR 90 SW
'07 MINI Cooper
Re: +8 tyre pressures [Re: Almond] #548112
14/12/18 10:13 PM
14/12/18 10:13 PM
Joined: Sep 2010
Posts: 1,552
Wales
T
Taffmog Offline
Talk Morgan Enthusiast
Taffmog  Offline
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T

Joined: Sep 2010
Posts: 1,552
Wales
25psi for me on the Aero +8.......

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