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Thread: Rpm @ 100kph for 3.9l V8

  1. #11
    Join Date
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    Rpm @ 100kph for 3.9l V8

    Quote Originally Posted by Slunnie View Post
    Does anybody know what I should be getting for a bog standard 3.9 5sp Disco1 at 100km/h. I think all of the abover were autos.

    I understand mine has an uprated alternator which makes the tacho read wrong. Currently it is reading at just a fraction over 3000rpm at 100km/h which I don't think is accurate.
    This might help

    Ashcroft Transmissions - Ratio Calculator

    Rpm @ 100kph for 3.9l V8Rpm @ 100kph for 3.9l V8Rpm @ 100kph for 3.9l V8

    Gav
    1985 110 Dual Cab 4.6 R380 ARB Lockers (currently NIS due to roof kissing road)
    1985 110 Station Wagon 3.5 LT85 (unmolested blank canvas)

  2. #12
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    My 300tdi manual with 245 75 16 tyres sits on 2200 (or 2250?) at 100k.
    1996 Disco 1 300TDI manual - Lucille a cantankerous red head! :D
    1997 Disco 1 300TDI Auto - sold

  3. #13
    discorevy is offline ChatterBox Silver Subscriber
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    assuming late d1 with the 1.211 transfer case 2260 rpm

  4. #14
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    Thanks for this! Looks like my tacho shows about about 75% in that case.
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~

  5. #15
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    to the OP- not enough,,, designed for Europe and British highways where 70 plus is the norm.. at 70 the little V8 is making enough to hold its own,, at 60 not so much..
    "How long since you've visited The Good Oil?"

    '93 V8 Rossi
    '97 to '07. sold.
    '01 V8 D2
    '06 to 10. written off.
    '03 4.6 V8 HSE D2a with Tornado ECM
    '10 to '21
    '16.5 RRS SDV8
    '21 to Infinity and Beyond!


    1988 Isuzu Bus. V10 15L NA Diesel
    Home is where you park it..

    [IMG][/IMG]

  6. #16
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    Quote Originally Posted by Pedro_The_Swift View Post
    to the OP- not enough,,, designed for Europe and British highways where 70 plus is the norm.. at 70 the little V8 is making enough to hold its own,, at 60 not so much..
    Showing your age there Pedro. Us fossils still think in MPH.
    ​JayTee

    Nullus Anxietus

    ​Getting involved in discussions is the best way to learn.

    2000 D2 TD5 Auto: Tins
    1994 D1 300TDi Manual: Dave
    1980 SIII Petrol Tray: Doris
    OKApotamus #74
    Nanocom, D2 TD5 only.

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