Back in the day I ran a 75 dry shot ( which is the worst) on a 99 Civic SI for quite sometime.
I really knew how to control it ( only sprayed under 8 seconds) and checked my spark plugs regularly. Checking spark plugs and doing compression checks became part of my regular maintenance- kinda like checking your oil level.
Nitrous is a very simple setup, that has 2 huge variables, which are what can become detrimental for your vehicle... Fuel and heat.
Dry kits only spray N20, while wet kits spray N20 and fuel, but only through 1 nozzle, which distributes the nitrous unevenly through out the cylinders.... naturally, the cylinder closes to the throttle body ( where the N20 comes in to the motor) gets more n2o than the other cylinders, thus causing more heat and stress to the motor... so if anything, you want to follow up with that cylinder more than others... and then you have the direct ports which equally spray all cylinders... this one could be considered the safest, but also the most expensive and with more variables.... With nitrous, you depend on selenoids to feed the N20 and fuel, and unfortunantely these selenoids fail, and stick sometimes... so naturally, with more selenoids, more chances of a mechanical failure.... so for all safety, always monitor your engine and if possible get a wide band oxygen sensor which will let you know when you're leaning out... meaning too much air (n20 in this case) and not enough fuel.
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