Nitrous oxide systems, specially those that boost engine output by 100 or more horsepower over stock have reputations as risky mods because of the history of engines grenading themselves, sometimes from the first time the system is used. From Hondas to V10 BMWs, the Internet is rife with stories of wasted engines that were the result of poor nitrous oxide system installation and tuning.
Not so with this particular Honda S2000 installation, whose owner's goal was to attain 400 whp using only a nitrous oxide system and no engine mods. The entire setup is composed of a Zex Direct Port 150 shot nitrous setup, Clutchmasters Stage 3 clutch, AEM Ems 1052, Full Standalone Fuel system, Q16 race gas, AP1 flywheel, Megan Racing test pipe, N1 muffler swap, Injen short ram intake with K&N cone filter, Walbro 255 lph fuel pump, bottle pressure between 875-900, Zex bottle warmer, Zex purge kit, Zex remote bottle opener and NGK 7405 plugs which are 2 steps colder than the original rating. The car is also 141lbs lighter, but as you can see, there were no major modifications to the engine internals.
With the above setup, engine output is now 390 wheel horsepower with the nitrous injection versus 215 whp stock. Torque is also correspondingly increased to 324 lb-ft from the stock 152 lb-ft. During the tuning process, the engine had been run almost 2 dozen times on nitrous, with no ill effects, as evidenced by the consistent cylinder pressures taken after the process. Clearly this shows that with the correct tuning parameters, nitrous oxide injection is a safe, reliable and cheaper alternative to other engine modifications, with the added benefit of being easy to remove and relocate to another car. Source post here.
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