kwjw64

I wasn't sure where to post this so I just picked this spot cuz I have an S197.

Generally speaking an increase of 10 HP on an engine will lower your ET by one tenth of a second, 20 HP increase will lower your ET by two tenths of a second. and so on. However, there is a limit to this concept. This general rule only applies to a certain range of ETs. For example, If you were to add 10 HP to your car that runs a 8.00 second ET, it would NOT run a 7.90 second ET after the extra 10 HP was added. Why? Because if you were to plot HP to ET on a graph is NOT completely linear. This is why people say once your car starts running really fast (say 11s), it gets harder and harder to go faster and faster because you can't rely on small HP increases anymore to lower your ET very much.

My question is: What is the range of ETs that this concept works for? I'm not positive, but I think this concept only applies for ETs ranging from 13 to 16 seconds.

If anything is incorrect here, please let me know! Thanks!

bob

probably works well aerodynamically speaking up to about 80 or 90 mph, beyond that and aero really sucks up power, hence the non-linear change in the way HP effects ET reduction as you increase speed. I'm sure the answer is more complicated than that (no doubt it is something along the lines of X increases with the square of Y), but it just seems aero is the bigger part of it.