Just wanted to know the best spark plugs to use when running 100 shot of nitrous . heard NGK 7405 an wanted to double check, -Thanks

 

I'm just running 1 step colder plugs with my 75 shot, they should be okay with your 100 shot also. Try out the R5671A-8 4554 NGK Coppers. You will have to replace them often since they are copper, but I would just swap them out every time you do an oil change. They only cost like $15 for all 4 of them so that's good. Mine are gapped at .32

 

The problem is that u never know when they are gonna foul out. I wouldnt run 2 step colder when im not spraying. I found out that my car runs best on stock heat range with a 75 shot. For a 100 shot i would get atleast 1 step colder. I would try the v powers heat range 8.

 

I used to gap mine at .32 but i got advice from a guy that ran nitrous for 30 years and he told me to go back to stock gap since im only spraying a 75 shot and he said my car will run harder then ever. And he was right. I used to get a little detonation cause the plugs were too cold. I dont get any detonation with the stock heat range.

 

Good info,Thanks alot guys

 

Yeah, i've been running mine for around 600 miles already and only sprayed my nitrous maybe 4 times since i've had it. My plugs look perfectly normal, I just check mine every other time I spray just to make sure they are in good shape.

 

They will look fine but when u run colder plugs on ur n/a and then u spray u can foul them out and burn a hole in the piston. Thats why it good idea to swap them out when ur done sprayin.

 

I'm a little confused, can you run 2668s on na setup? I had mine gapped to .40 when I sprayed and kept them in my car na. I've never had a problem

 

Run NGK V-powers you'll be fine na or on the hahaha gas