i have just installed a zex nitrous system in my stock 91 civic dx and all i have added were the zex plugs to the motor. I was wondering if a 55 shot would be safe for it the way it is at 129,xxx miles? thanks for your time

 

i would recommend doing a cylinder leak down test to check your engine's compression. you can get away with a 55 shot and zex plugs. if you want to be on the safe side i would look into running an ignition system and retarding your timing.

 

hey thanks for the help i'm going to check compression on my car this weekend. What should it be within? and also i want to retard the distributor 2 degress. Am i right?

 

Yes, a good rule of thumb is retard the timing 2 degrees for every 50 shot. Im not sure what compression your car is, but the readings should be 10-15% within each other i believe. do a search for archived topics "compression"