Tyre pressures are critical on a P38.
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Thread: Tyre pressures are critical on a P38.

  1. #1
    FRESHMAN ROVER
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    Tyre pressures are critical on a P38.

    Perhaps this has been covered before but not recently, I think.

    I always thought that my car had issues with driving in a straight line and tram-lining under braking. Four new tyres and a wheel alignment definitely improved things a lot but the issues remained, albeit reduced.

    My tyre pressure placard is missing; where is it supposed to be in a 2000 Vogue?

    Several weeks ago I inflated the tyres to the correct pressure: 38 psi in the back and 28 psi in the front (as most readers on this forum know). It has transformed the handling; for a big car with live axles I feel it is as good as it can get, even though there is a little play in the steering which seems to be one or both of the steering shaft uni joints. Check and maintain your tyre pressures correctly! It really made a staggering difference to the car's handling.

    Tom
    Vehicle is a 2000 Vogue.

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  3. #2
    Premium Member Escape's Avatar
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    Re: Tyre pressures are critical on a P38.

    Yeah, tyre pressure can make a big difference. That holds true for all cars that give you feedback, less so on your average eurobox.
    Out of interest, was your front pressure to high? I noticed an increased tendency to understeer with high front pressure. No tramlining though. The ideal pressure will also depend on the tyres fitted. The placcard should be in the fuel flap, and in the manual.

    Filip
    4.0 SE manual, 1997, 'Priscilla': current daily
    4.0 SE manual, 1995, 'Piper', built for offroad with tuned 4.6 on MS: lost in fire
    4.6 SE auto, 1995, 'Prue': awaiting attention
    2.5 DT manual, 1996, 'Paige': retired and stripped
    D90 TD5, 2005, 'Nessie' TR2 racer: sold

  4. #3
    FOUNDING MEMBER
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    Re: Tyre pressures are critical on a P38.

    I have always found 28psi for the front tyres too low resulting in typical under inflated outer edge wear on the tyres. I run my fronts at 32psi and the wear is very even with no tramlining or understeer. 38psi for the rears seems fine.
    2001 Vogue . . . . . . and, yes, I do own the road!

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  6. #4
    FRESHMAN ROVER
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    Re: Tyre pressures are critical on a P38.

    I run VAL at 32/42 I carry quite a load most of the time. She is running 255/65/16s

  7. #5
    FOUNDING MEMBER
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    Re: Tyre pressures are critical on a P38.

    Good point about tyre size. I should have stated my pressures (32/38 are for 255/55 r18s.
    2001 Vogue . . . . . . and, yes, I do own the road!

  8. #6
    FRESHMAN ROVER
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    Re: Tyre pressures are critical on a P38.

    Hi all,
    i must confess I hadn't noticed the specified different tyre pressure between the front and rear.
    I have been incorrectly running about 35psi all around.
    it seems so strange and counterintuitive to be running substantially less pressure in the front.
    Are all older Range Rovers the same?
    I will adjust at the first opportunity.
    Does anyone know why this situation exist? Unless heavily laden I would have expected the fronts to require a higher pressure than the rear
    regards
    Al

  9. #7
    FRESHMAN ROVER Rioja Red's Avatar
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    Re: Tyre pressures are critical on a P38.

    28/38 absolutely here. Anything else results in very poor road manners.
    1999 & 9/8th's 4.0S (GEMS) 101,000. Died of natural causes.
    1998 Discovery LE Passed on to rock crawler conversion.
    2003 Discovery HSE7 Current Driver.
    1999 Range Rover 4.6 HSE Callaway (GEMS) 159,000 Current Driver.
    ..... at the feast of egos
    everyone leaves hungry .....

  10. #8
    FRESHMAN ROVER
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    Re: Tyre pressures are critical on a P38.

    I just tried 30 psi in the front and 38 in the back; at 28 in the front the tyres do seem a little under-inflated. The road manners seemed to improve a little with the slightly higher pressure in the front. I'm now sticking with 30/38. P38s seem very sensitive to tyre pressure.
    Vehicle is a 2000 Vogue.

  11. #9
    FRESHMAN ROVER
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    Re: Tyre pressures are critical on a P38.

    Agreed - here is Perth every tyre replacement place seems to want to have tyres in the 38-42 range. Mine tramlined like hell and this was after drag/steering bar change and alignment. 32/38 and its much much better.

  12. #10
    SOPHOMORE ROVER
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    Re: Tyre pressures are critical on a P38.

    So after reading this thread I changed to 28 front/38 rear as recommended and it made a HUGE
    differance. My team lining is practically gone and handling is drastically improved. I’ve been driving for years on the wrong pressure and I feel like a dope. Plus 5 to actually running the recommended tire pressure. It makes ALL the difference in the world.

    2002 HSE 4.6
    P38 black/black Audi heater core installed, double din radio installed,
    PAC Steering wheel controls and backup camera installed.

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