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Thread: 94 vs 96 open rd

  1. 4th November 2009, 11:30 AM #1
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    roverv8
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    94 vs 96 open rd

    Was wondering if someone could shead some light,
    My 94 Disco on the open road cruises 2500rpm at 95kph
    My Fathers 96 Disco sits on 2200rpm at 100kph
    The 94 is the later 94 vin JG

    Did the diff ratio change with these 2 models??
    Thanks Luke
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  2. 4th November 2009, 11:36 AM #2
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    The diff ratio is the same.

    Are both cars the same (V8/Tdi, auto/man)?

    The tacho gets a signal from the alternator. If one's been changed or has a different pulley size, that can affect the tacho readings.
    Scott
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  3. 4th November 2009, 12:19 PM #3
    It'sNotWorthComplaining! Guest
    Different tyre sizes can affect the RPMs Speed. If you both have the same size rims but different tyre sizes it could cause the difference.
    I have 16 " rims with Cooper Sts. I'm sitting on 100 kph and did a speed check on one of those overhead speed detectors and has about 8 kms slower.
    Also are you using 5 gear on both
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  4. 4th November 2009, 12:28 PM #4
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    Different tyre sizes will have an effect on RPM vs Speed, but not on RPM vs Speedo reading.
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  5. 4th November 2009, 12:32 PM #5
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    Is your disco going into lockup?
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  6. 4th November 2009, 01:21 PM #6
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    Sorry all, both V8 and auto, serp belt
    Tyres same size, pully on alternator appear the same,
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  7. 4th November 2009, 01:33 PM #7
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    Quote Originally Posted by Lucus View Post
    Is your disco going into lockup?
    No it free moving, no resistance at all
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  8. 4th November 2009, 01:51 PM #8
    PhilipA
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    No it free moving, no resistance at all
    He means
    "Is the torque converter lock up clutch engaging at 85Kmh as it is supposed to?"
    If it is you will feel it lock by a drop in revs and a feeling like the car has changed gear.

    The other test is to go up a medium/steep hill at say 90 KMh and put the foot down. If the converter is locked there will be no change in revs, if not the revs will rise but the speed will stay the same.
    Regards Philip A
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  9. 4th November 2009, 01:54 PM #9
    mike 90 RR Guest
    Quote Originally Posted by Lucus View Post
    Is your disco going into lockup?
    Quote Originally Posted by roverv8 View Post
    No it free moving, no resistance at all
    Thats not what Lucus means ... When the car gets to 85kph ... Does the Auto gearbox go into (what feels like another gear) "overdrive" (Revs drop)


    Mike
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  10. 4th November 2009, 02:48 PM #10
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    Apologises Guys, i should have been clearer,Yes i meant it the torque convertor locking up as it should

    This could account for the difference in revs
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