imp 800 should be geared to go 95-97mph on grass the gearing chart will give some recomendations but you will need to test.in the end it is your e.t. that will matter more than top speed although they do seem to be relative with each other on a properly clutched and motord sled. the time to go after is 5.15 @ 95mph .23-44 is what we ran in our f chassis sled.