Ngk Tr-6
i will get the full explanation today but Steve Petty told me not to be using a projected tip plug.....he was shocked that we used the tr-6s....supposed to give me what he feels is a better alternative today and explain his reasoning using my 317 heads.
I thought I saw a rule of thumb to decrease plug gap by .010" for every 100 hp increase. But, that was with nitrous.
Here is the spark plug reference in the nitrous section:
https://ls1tech.com/forums/removed-locked-thread-graveyard/456380-spark-plug-reference-chart.html
FWIW, I have mine gapped at .040" running 7-8 psi. The only problem I have is a miss on cylinder 8 between 1000 and 1500 rpm only. It just popped up yesterday, so have not investigated it yet.
Here is the spark plug reference in the nitrous section:
https://ls1tech.com/forums/removed-locked-thread-graveyard/456380-spark-plug-reference-chart.html
FWIW, I have mine gapped at .040" running 7-8 psi. The only problem I have is a miss on cylinder 8 between 1000 and 1500 rpm only. It just popped up yesterday, so have not investigated it yet.
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Originally Posted by KLRWS6
Theres actually a colder plug than the tr-6. NGK makes a tr-8 plug, thats what i have been running in my car boosted
and its a racing plug.
Originally Posted by nitrorocket
I have not heard of people needing a tr8 untill 25+ psi. I run the tr6 gapped at .040.
Change to a cooler plug like the NGK 7's, 8's or 9's etc and decrease the chances of the plug ever glowing and better yet not pre igniting an incoming mixture before the PCM actually tells it to spark.
Originally Posted by V6 Bird
NGK doenst make a TR8...its a NGK 7173 and its a racing plug.
and its a racing plug.
Originally Posted by bowtieman81
I thought I saw a rule of thumb to decrease plug gap by .010" for every 100 hp increase. But, that was with nitrous.
Here is the spark plug reference in the nitrous section:
https://ls1tech.com/forums/showthread.php?t=456380
FWIW, I have mine gapped at .040" running 7-8 psi. The only problem I have is a miss on cylinder 8 between 1000 and 1500 rpm only. It just popped up yesterday, so have not investigated it yet.
Here is the spark plug reference in the nitrous section:
https://ls1tech.com/forums/showthread.php?t=456380
FWIW, I have mine gapped at .040" running 7-8 psi. The only problem I have is a miss on cylinder 8 between 1000 and 1500 rpm only. It just popped up yesterday, so have not investigated it yet.
If that was the case, I would have .000" gap!!
Teching In
Joined: Feb 2005
Posts: 12
Likes: 0
Originally Posted by cablebandit
i will get the full explanation today but Steve Petty told me not to be using a projected tip plug.....he was shocked that we used the tr-6s....supposed to give me what he feels is a better alternative today and explain his reasoning using my 317 heads.
did he ever give you an alternative?
yes they did. They said the projected tip was a hot spot waiting to cause detonation. i was told to run a R5671A-7 or 8 since i am trying to push the incons. I will try them and see how they do. I have a set of tr6s sitting here if they dont work out. They wanted me to run a -8 or -9 heat range but said to go 7/8 since i daily drive the car.
Originally Posted by Pro Stock John
I've been running TR8's, and the new turbo combo runs an equivalent plug that the AllPro heads require.
Originally Posted by cablebandit
yes they did. They said the projected tip was a hot spot waiting to cause detonation. i was told to run a R5671A-7 or 8 since i am trying to push the incons. I will try them and see how they do. I have a set of tr6s sitting here if they dont work out. They wanted me to run a -8 or -9 heat range but said to go 7/8 since i daily drive the car.