Rpm @ 100kph for 3.9l V8

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Originally Posted by Slunnie

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.

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This might help

Ashcroft Transmissions - Ratio Calculator

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Gav

My 300tdi manual with 245 75 16 tyres sits on 2200 (or 2250?) at 100k.

assuming late d1 with the 1.211 transfer case 2260 rpm

Thanks for this! Looks like my tacho shows about about 75% in that case.

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..

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Originally Posted by Pedro_The_Swift

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..

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Showing your age there Pedro. Us fossils still think in MPH.