i think if you ever compared a dyno sheet of an engine before and after a Nos Hit..you will see the TQ curve is much more nasty then the increase in HP........so IMO you really can't back into your ET vs Hp gain theory on NOS...your cam grind,converter and gear ratio will play a much bigger factor in how your Car will pick up on a 150 shot more then anything....s..
Just to Give you an example...My car is 100% Set of for NOS ( Converter,gear,cam grind)
1/8TH Mile et's and Mph
On Motor- 5.84et @ 124 mph
with a 250 shot- 4.89@144 mph
see what i am speaking of...much better results then a 250hp increase advertised Nos HP pill huh ?..not the big of a shot just the way the car is Set up.
Now the Funny thing is that its only 2 tenths faster with a second stage for a total of 550 hp shot...... :P
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "