How many runs with 10lbs bottle of nitrous?

Unless it was a looooooong race, a 125 shot should last a lot more than one race!

A good baseline guess is for every 10 seconds at 100HP = 1lb

Considering I don't hit the nitrous til the very top of first, I'd say I get a minimum of 8 full 1/4th mile runs a bottle. Usually a bit more than that though.

I had noticed when I ran my 125 jets I made a good 4-6 pass's. If you have a heater to keep the psi up you will get more.

A buddy had a 150 shot on his fox and got about 4 runs.

If he only got one pass/run he needs to check for leaks/make sure he is closing his valve all the way.