IMO, more than 30hp for a tenth, a lot more.
At 3800lbs, going from 11.50 to 11.40, the moroso chart shows it would take 13hp, about the same for going from 115mph to 116mph.
Yep, about right. Heck at 30 horse for a tenth, that would be only a little better than 3 tenths with a hundred horsepower gain... Lol
100 horse change is WAY more than 3+ tenths.
I saw exactly a tenth( as did my brother with his car at the same time) when we both went to electric water pumps and electric fans years ago. We figured a 12-15 horse change, and it indeed showed up as a tenth on our time slips.
