thanks to all your replys that what i thought but wasnt sure ,will just have to alter my driving to suit the tyres i fiited them for the extra lift they give(just over an inch)

Hi All I have a m reg discovery 300tdi with 98000 miles on the clock. i have recently fitted 235/85/16 mud terrains my problem is since fitting them it seems to have lost a lot of topend pulling power ,it pulls really good through the gears with very little turbo lag but loses its leg when...