Thread: Thunderbolts Way & TD5 lack of power on hills.

Originally Posted by johntins

A bit out of left field, but have you had the auto, and more particularly, the torque convertor checked? I can't speak for a Defender, but there is no way my Disco would be doing what you describe. Thunderbolt's can be steep, but not that steep, and TD5s go well when on boost.

Not that steep ! What road are you comparing it to.

If you look at the Ashcroft transmission ratio calculator for a Defender with Disco auto and transfer case and 235/85 16 tyres this is what you get

35 kmh at the top of a hill looks pretty sad

High First Second Third Fourth
10 KPH 701 418 283 206
20 KPH 1402 837 565 411
30 KPH 2103 1255 848 617
40 KPH 2803 1673 1130 823
50 KPH 3504 2091 1413 1029
60 KPH 4205 2510 1696 1234
70 KPH 4906 2928 1978 1440
80 KPH 5 607 3346 2261 1646
90 KPH 6 308 3764 2543 1852
100 KPH 7009 4182 2826 2057
110 KPH 7709 4601 3109 2263
120 KPH 8410 5019 3391 2469