Tyre pressure and temperature - Page 2

COLVERT · 18th October 2016, 17:50

Quote:

Originally Posted by Phill_190

What should the pressure be in a zt saloon 2.5? I recently put 36psi in front and 35psi rear! It is running 18" alloys. I was told its way to high and should be 32.. wondered why my car was rattling!
I used a tyre pressure finder online and that said 35 front 34 rear.
What do all you put in?

Read the chart in post 8 that T-Cut has kindly donated for your pleasure.---

Phill_190 · 18th October 2016, 18:07

Sorry! Its not showing on my phone! Was just curious as some are saying the book is to low etc

Dorset Bob · 18th October 2016, 18:35

I suppose it depends on the version of the handbook that you are looking at.

My earlier 2001 handbook, that came with the car, a KV6, is:
2.1 bar 30psi (F) and 1.9 bar 28psi (R)
rather than
2.2 bar 32psi (F) and 2.1 bar 30psi (R) in the above 2004 issue, that T-Cut has put up.

For the German market it is:
2.5 bar 36psi (F) and 2.4 bar 35psi (R) - Reduced Load
2.6 bar 38psi (F) and 2.5 bar 36psi (R) - Maximum Load

I agree with the OP that these tyres look like they are under inflated at the standard book figure.

I am running mine at 34psi (F) and 32psi (R), which seems to suit the car better.

Avulon · 18th October 2016, 18:53

Quote:

Originally Posted by T-Cut

Handbook 2004

Quote:

Originally Posted by Phill_190

What should the pressure be in a zt saloon 2.5? I recently put 36psi in front and 35psi rear! It is running 18" alloys. I was told its way to high and should be 32.. wondered why my car was rattling!
I used a tyre pressure finder online and that said 35 front 34 rear.
What do all you put in?

nuff said...

Save

Phill_190 · 18th October 2016, 19:03

Ok i will drop it down to 32psi and see whats its like... my car is a 2001 if that makes any difference

hogweed · 19th October 2016, 09:35

I agree that the apparent pressure will be about 5lbs higher when the tyres are hot. And I also find that it all “works” better with 35 all round (stone cold) than the official figures. The tyres always look a little flat at the lower figures, and I lose a couple of mpg, which surely can’t be right…

Maybe my car’s extra heavy

Or maybe I am

I wouldn't drop your pressures.

T-Cut · 19th October 2016, 09:38

Quote:

Originally Posted by hogweed

The tyres always look a little flat at the lower figures

I agree they look under inflated. I suspect it was part of MGR's comfortable ride strategy. I prefer 34 all round.

TC

hogweed · 19th October 2016, 09:45

Quote:

Originally Posted by T-Cut

I agree they look under inflated. I suspect it was part of MGR's comfortable ride strategy. I prefer 34 all round.

TC

Yes, and at the lower figures, they do seem to wear at the edges, which I'd normally associate with under-inflation

ZedTeeTee · 19th October 2016, 12:33

Do you know, I've just learned something new, I never even twigged that the Tourer pressure might be different to the Saloon, I need to top mine up a little it seems. Well, really I need to refurb them completely THEN put the right pressure in but one step at a time

Plezier · 19th October 2016, 12:38

That must be a post Project Drive listing as it does not have the 205/65 R 15's found on the early cars. My 99 dated handbook states 30 Front and 32 rear for teh 205's on a Diesel.

18th October 2016, 18:35	#13
Dorset Bob Senior Citizen Rover 75 2.5 Connoisseur SE,Chrysler 300C,124 Spider, Daytona 955i,Honda XL250 & Royal Enfield 650GT Join Date: Feb 2008 Location: The Kingdom of Wessex Posts: 6,976 Thanks: 2,391 Thanked 2,685 Times in 1,686 Posts	I suppose it depends on the version of the handbook that you are looking at. My earlier 2001 handbook, that came with the car, a KV6, is: 2.1 bar 30psi (F) and 1.9 bar 28psi (R) rather than 2.2 bar 32psi (F) and 2.1 bar 30psi (R) in the above 2004 issue, that T-Cut has put up. For the German market it is: 2.5 bar 36psi (F) and 2.4 bar 35psi (R) - Reduced Load 2.6 bar 38psi (F) and 2.5 bar 36psi (R) - Maximum Load I agree with the OP that these tyres look like they are under inflated at the standard book figure. I am running mine at 34psi (F) and 32psi (R), which seems to suit the car better. __________________ Let the good times roll............ Last edited by Dorset Bob; 18th October 2016 at 19:32.. Reason: Addition of German Pressures

19th October 2016, 09:35	#16
hogweed I really should get out more....... Vauxhall Insignia CDTi; MG TF 135 Join Date: Jan 2010 Location: Norn Iron Posts: 2,958 Thanks: 942 Thanked 378 Times in 297 Posts	I agree that the apparent pressure will be about 5lbs higher when the tyres are hot. And I also find that it all “works” better with 35 all round (stone cold) than the official figures. The tyres always look a little flat at the lower figures, and I lose a couple of mpg, which surely can’t be right… Maybe my car’s extra heavy Or maybe I am I wouldn't drop your pressures. __________________ Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.

19th October 2016, 12:38	#20
Plezier I really should get out more....... Mercedes C Class CDI estate (2003) Join Date: Sep 2012 Location: Gradina Posts: 2,652 Thanks: 62 Thanked 137 Times in 119 Posts	That must be a post Project Drive listing as it does not have the 205/65 R 15's found on the early cars. My 99 dated handbook states 30 Front and 32 rear for teh 205's on a Diesel. __________________ Classic SE CDT sadly lost in a severe collision.

18th October 2016, 18:07	#12
Phill_190 Gets stuck in MG ZT Saloon Join Date: Apr 2016 Location: Kent Posts: 653 Thanks: 36 Thanked 97 Times in 74 Posts	Sorry! Its not showing on my phone! Was just curious as some are saying the book is to low etc

18th October 2016, 19:03	#15
Phill_190 Gets stuck in MG ZT Saloon Join Date: Apr 2016 Location: Kent Posts: 653 Thanks: 36 Thanked 97 Times in 74 Posts	Ok i will drop it down to 32psi and see whats its like... my car is a 2001 if that makes any difference

19th October 2016, 12:33	#19
ZedTeeTee This is my second home Rover 75 Saloon Join Date: Feb 2011 Location: Stanley Posts: 3,334 Thanks: 240 Thanked 303 Times in 172 Posts	Do you know, I've just learned something new, I never even twigged that the Tourer pressure might be different to the Saloon, I need to top mine up a little it seems. Well, really I need to refurb them completely THEN put the right pressure in but one step at a time