200tdi Max RPM?

pos · Jun 28, 2012

Hello,

I have a question regarding the discovery 200tdi fitted to my 1986 90. I have standard 90 axles with the standard 90 transfer box and a standard LT77. The tyres I have fitted are 16x235x85, so quite tall. If I am driving my 90 at 60mph, roughly what RPM would it be doing? I drove to and from Ipswich the other night doing 85mph most of the way. I could hear that the engine was revving relatively high but I have absolutely no idea what RPM it was actually doing. Can anyone give me an idea? What can the 200tdi actually rev to before it is restricted? I've never had a taco!

Thanks,
-Tom

Reeves · Jun 28, 2012

My speedo reads 85 mph and my sat nav he say 70 mph ?

jai_landrover · Jun 29, 2012

what tranny box 1.66 or 1.4??

I would guess 1.4 by your speedo indication

jai_landrover · Jun 29, 2012

1.4:1 tranny box 31 inch tyres circa 750/235,85s

Speed/Gear First Second Third Fourth Fifth
10 MPH 1941 1246 816 542 450
20 MPH 3883 2492 1632 1083 900
30 MPH 5824 3738 2448 1624 1350
40 MPH 7765 4984 3264 2166 1800
50 MPH 9706 6230 4080 2707 2250
60 MPH 11648 7476 4896 3249 2700
70 MPH 13589 8722 5712 3790 3150
80 MPH 15530 9968 6528 4332 3600

1.66:1 tranny box tyres 31 inch

Speed/Gear First Second Third Fourth Fifth
10 MPH 2295 1473 965 640 532
20 MPH 4590 2946 1930 1280 1064
30 MPH 6885 4419 2894 1921 1596
40 MPH 9180 5892 3859 2561 2128
50 MPH 11475 7365 4824 3201 2660
60 MPH 13771 8839 5789 3841 3192
70 MPH 16066 10312 6753 4481 3724
80 MPH 18361 11785 7718 5122 4256

Anything over 4K is a bit pushing it for a tdi tho

sypher · Jun 29, 2012

@ 65 mph before I changed my tranny to a disco one running 85's , my tach read 3500rpm abouts . with a disco tranny it reads 2600 rpm at 60 odd . Defo worth fitting a disco tranny tho , yeah you loose a some torque but lower rpms = better mph

happy days .

dangerousbrain · Aug 3, 2012

jai_landrover said:
1.4:1 tranny box 31 inch tyres circa 750/235,85s

Speed/Gear First Second Third Fourth Fifth
10 MPH 1941 1246 816 542 450
20 MPH 3883 2492 1632 1083 900
30 MPH 5824 3738 2448 1624 1350
40 MPH 7765 4984 3264 2166 1800
50 MPH 9706 6230 4080 2707 2250
60 MPH 11648 7476 4896 3249 2700
70 MPH 13589 8722 5712 3790 3150
80 MPH 15530 9968 6528 4332 3600

1.66:1 tranny box tyres 31 inch

Speed/Gear First Second Third Fourth Fifth
10 MPH 2295 1473 965 640 532
20 MPH 4590 2946 1930 1280 1064
30 MPH 6885 4419 2894 1921 1596
40 MPH 9180 5892 3859 2561 2128
50 MPH 11475 7365 4824 3201 2660
60 MPH 13771 8839 5789 3841 3192
70 MPH 16066 10312 6753 4481 3724
80 MPH 18361 11785 7718 5122 4256

Anything over 4K is a bit pushing it for a tdi tho

That is quite a useful tool. I've got 35's on my disco and it bogs down something chronic when starting off, its top speed just dies at 50 mph. The front out put bearing on the transfer box is as sloppy as you like so I am looking to swap out the transfer box for a 1.4 or 1.6. Using those figures would it be accurate to say I could divide the revs by 35 multiply by 31 to give me the revs on a 35" tyre or is there a more complicated calculation required based on circumferences etc?

jai_landrover · Aug 3, 2012

Firstly measure your tyres forget that they say 35 what they say is irrelevant.

Measure the actual height would guess circa 33 ish and head to Ashcroft transmissions website click on their ratio calculator and input your measurements and ratios

But honestly forget whatnot says on the side of the tyre they are nowhere
Near accurate

Jai

dangerousbrain · Aug 6, 2012

Ah OK I shall give that a bash. In the meantime I've landed a transfer box for pennies from a 110 so I will bash that on and see what the real life difference is.

200tdi Max RPM?

pos

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Reeves

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jai_landrover

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jai_landrover

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sypher

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dangerousbrain

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jai_landrover

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dangerousbrain

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