That's actually a really good question. I never thought about that. I always assumed it was 30 over whatever your truck is stock???
that is certainly different than what Smarty said for years...On a S.O. it will add whatever the tune is supposed to add then a little more. Say sw 3 on a Jr is advertised as 100 horse. It adds more than advertised on all trucks. Like actually 106 vs the 100 advertised. So a 250 version 03 would be approximately 366 ish at the flywheel. And take it back to stock and it wont be the 305 program from the Smarty. It will be back the same as it was when stock, ie 235 (Ca) or 250 (Fed).
You guys can share dyno numbers if you get them.
agree-that is certainly different than what Smarty said for years...
was first told yes... but I now find out no. it only gives you what it adds, plus the original HP.you'd see higher gains on the S.O than on the H.O wouldn't you?