Originally posted by SleeperZ:
50% of rated HP is the "rule of thumb" for nitrous on any car.
I know for a fact the Zetec can take a 100HP shot with the right tuning.
And I'll bet 125HP isn't out of the question (although probably not for more than a few times).
I have varied between 55, 65, and 75HP shots for a bit over 2.5 years (say 40+ bottles) with no problems at all.
The Zetec really does respond well to nitrous.

That being said, on to the warning......

The Zetec has hypereutectic pistons,
which is the least desirable pistons to run with nitrous,
(and one of the most desirable for turbos and s/c's).
Any detonation of nitrous (regardless of HP shot) will shatter the pistons like a hammer on glass.


Once you pass 100HP shot the combustion chamber temps really start to climb quickly and other problems start to become an issue.
Anything over 150HP is out of the question without internal work.




This is the way to answer a post!

Ty for the answer.