anyone running ngk tr-7's?
 

im running tr6's now set at .040.
scr is 11.5:1 and dcr is 8.5:1. 150 wet shot. car sees some kr on the street but none on the dyno. just thinking about everything before i take it apart.

Yes, I have them in my car currently.
Robert

do u have any iput on them or think i would need them?

Bigger shots can have a tendency to turn the projected tip tr6s into blow torches if any of a few parameters get out of whack. The 7s are a colder recessed tip and more forgiving in a high cylinder pressure arena, imo.
Robert

I plan on running them next year. I put about 7 runs on a 200 and about 10 150 shot runs on TR6's before I changed them. They looked great. So, to piggyback off of Robert, if you have a solid tune, a 200 shot is about the ceiling for the TR6.

I'm running a #8 on motor, and a #9 on nitrous, both gapped at 35 I think on the street the #9's would foul out easy, but the #8's have been very good.

I am running a good bit more compression though at 13.5 to 1 static, and the dcr is way up there as well. Torco 116 n/a fuel, torco 118 Nos blend for nitrous.

Good point to clarify on the 200 ceiling, as I agree. The first time I had problems with TR6s, after a few hundred passes, was when going over a 250 shot.
Robert

What size hit you doing? I also run the 116, but VP, and straight up on the spray. Though, my timing is set for 14° on the 300 hit.
Robert

150 shot thru a Nos plate. Timing is pretty low but for some reason my car's never really liked alot of timing, the n/a tune I had in it all season was only at 20, we had it up more but it didn't make any more power so it wasn't worth it.

I run the 118 fuel because it's just added safety and that's what my shop uses with all the nitrous cars, so they know the tuning with it/jetting when using it. My nitrous tuneup is still well on the safe side, but again, better safe then sorry. I pulled every plug after every run when I went to atco and sprayed it the first time and every single plug looked great porcelan had a nice tan color to it, ground strap had ust about zero heat to it, etc.etc. I probably could have used the #8 plugs and been fine, but I had to buy plugs anyway so I went a step colder for the first trip to be safe. Better to start safe then start off too hot and hurt something.

IMO a #6 plug is a good n/a plug for under 12 to 1 compression, over 12 to 1 I'd go #7 n/a, or any nitrous at all with under 12 I'd run a #7, over 13 to 1 I'd run a 7 or 8 n/a and an 8 or 9, or even a 10 with nitrous, dependign on what the compression/size of the shot is.

I run 7's & spray a 250 shot . I gap them at .025. When i sprayed the second stage we put 8's in, same gap. You gottto make sure fuel & nos pressure are right., with timing pulled. Thats whats been working for me.

So we're saying a 200 shot is the ceiling for a TR6. What's the ceiling for a TR7?

I have a new set of all pros that don't accept acorn style plugs. I don't have the engine together, but what plugs would work in these heads that are comparable to a TR6/7/8 etc?

No not an absolute ceiling at 200, as many, including myself have run past this. However, any glitch in your system and there is no safety net, so...
Robert

Personally..... if you're gonna spray over 100 I'd go to a 7 for that safety net. I dunno why people try to push the envelope with stuff like spark plugs, They're so cheap and easy to change I will never understand.

stockish compression 100 shot #6, more then 100 #7. 12 to 1 compression and a 100 shot @7, more then a 100 shot #8, 13 to 1 compression #8 with a 100 shot, more then 100 shot #9, etc.etc. It's probably overkill safe, but again, for the 16 bucks or whatever a set of plugs cost, why not start cold, see what they look like and go from there?