All right guys i'm sure you've heard this question before: What type of plugs should i run with nitrous? thanks for your help

 

autolite 104's or NGK TR6's are the most commonly used. be sure to not use a platinum plug.

 

NGK TR6 seems to be a very popular choice. Also the autolite 103 is used by some guys. hope this helps.

 

im very confused on this. i know on your traditional SBC, when using n2o, you want to go to a colder plug. i currently have the stock plugs, which i am told are platinum, in my juiced 96 Z. im getting ready to do a plugs/wires change very soon because im about to trip 100k. now a very good friend of mine that is a service tech at a GM dealer wasnt sure about wheather or not i should go to a colder plug or not. so he asked the auto tech superviser, who im told is VERY knowledgable and has been working there for 20+ yrs, and he recommended staying with the stock type plug. reason being, he said if you go to a colder plug it could very possibly throw the timing off by the comp adjusting it.

anyone ever been told this? im nervous after hearing this. my current set up has been working fine so far which is another reason he suggested sticking with the stock plugs. however, i am getting ready to switch in the 150s soon. anybody got any advice??


thanks jon

 

COMN,i have never heard that,plus the fact my et's didnt change at all when i went to the NGK TR6. It is colder,and didnt change anything. Just get the colder plugs and have fun.

Also,you are running nitrous with Plat plugs? eewwww,im willing to bet your plug gaps are in the 60 thousand range now.Nitrous and Plat. plugs DONT play well together.

 

so youve never heard of that huh? hmm. i dont know, i mean, it makes sense that the comp would want to retard the timing if it senses the cold plugs, i guess. i just dont want to lose anything NA. my car is a beast right now for being mostly stock and i dont want that to change when im running NA. and, like i said, everythings been perfectly fine so far. i guess ill have to think about it......

 

how does the computer know what plug is in it? all the computer does is set the ignition up to light off the right plug at the right time. There is NO way the computer knows if you have a platinum or a copper plug.

The main reason for going to a colder plug (aka shorter electrode) is is to prevent possible hotspots that could cause preignition or detonation.

Your car will not know the difference bewteen a tr55 (stock copper replacement) and a Tr6.
I was running 12.4's with a stock style plug n/a,and kept running 12.4's with a colder plug,with an occasional 12.3.

 

well, in theory, the cooler plug will emit a spark in the cylinder that is not as "hot" as the factory platinum plugs. the computer will read this spark and retard the timing. so no, technically speaking, the computer wont know the actual plug difference, but it will be able to tell the difference in the spark, which will change with the plug.

like i said, ill probably think it over some before making a decision.

jon

 

your choice. just letting you know platinum plugs and nitrous dont play well together. and the actual spark will not "change" it's where the spark is placed in the chamber.

I was going to step up to a 200 hit and MANY reliable sources (John Phillips from NX,and a few NOS tech guys)suggested a Tr8 in order to not detonate the crap outta it. just DONT run platinum.

Also i saw NO timing being pulled with autotap after the plug change,just more food for thought.

 

I'm one of the Autolite 103 guys.

 

PCM does not measure how much spark the plugs get. it will pick up knock and retard timing for that, but one heat range will not cause knock. go with one heat range colder for the 150 shot, and be sure to use a non-platinum plug. the N2O causes heat too hot for the platinum and it makes it go bye-bye! you can end up with the tip of your platinum plug riding in the top piston ring along the cylinder wall if you really want to.

 

What should the gap be set at for the TR6's?

 

my TR6's are gapped to .042". i also have a digital ignition.

 

I'm another one of the Autolite 103 guys. Gapped at .038.

 

My TR6's are gapped at .035"... stock plugs are gapped at .050