which plugs to go with??

[87GN 98GTP]

So you can see my mods in the signature, ive used -7 plugs before but they foul out too fast unless im at the track, for regular day to day driving I used the NGK tr6 plugs but champion says 103's. Anyone have better success with 1 over the other or a totally different plug?

 

[Phoneguy]

NGK R5671 a 9
non projected tip, gasketed. KevinB and Jason White turned me on to them.
Bryan

 

[87GN 98GTP]

those are non resistor plugs and I can not use that style

 

[Turbotre]

I use AC R43TS plugs.Nothing special.
When I bought the car it had AC R42TSX plugs,gapped at about .120,it was ridiculous.

 

[mikes gn]

sorry for the hi jack, but how will a car run if the plugs are bad, or maybe gapped to wide

 

[Clark6]

The 103s were fine during the winter for me but the summer heat and my new 80lb injectors I was fouling plugs left & right with a little fuel added to the tune.
So I put the Autolite 104s back in and took a little fuel out & I can run it again riding it around town & getting on it every now & then. Couldn't do that when this hot weather came. I'll put the NGK 6s or Autolite 103s back in this late fall. I think those injectors may be a little much for now, I didn't have that problem with the 60s. But I am figuring them out now.

 

[Phoneguy]

those are non resistor plugs and I can not use that style

Why cant you use that style?? GN1 heads will take a tapered seat or a gasketed plug.

Bryan

 

[87GN 98GTP]

the non resistor plugs show up funky on the dyno and the laptop for tuning things, I personally dont quite get it but I had in ngk-7s non res and my tuner said it didnt read quite right

 

[87GN 98GTP]

hey clark 6, ive ran ngk tr6 a few times and keep fouling then out after 500 miles same for you ??

 

[87GN 98GTP]

FYI- if the plugs are bad itll miss fire and gapped too much on high boost you will blow out the spark or run like crap depending on the setup

 

[Clark6]

hey clark 6, ive ran ngk tr6 a few times and keep fouling then out after 500 miles same for you ??

not even 500 miles everything was fine as long as I didn't get into boost too much but I had too much fuel with the TT chip and fouled them that quick. I've tried 103's tr'6 gapped .35 , .30, finally settled on .28 gap & put in the street autolite 104's and took more fuel out like I said, I have a single nozzle alky and anything in between start & wot; it's the mid-range throttle is what was getting mine. WOT was fine, cruising was fine, just when getting into it the injectors was dumping in too much fuel while I was trying to peddle the throttle to keep from spinning & during that time to WOT was ok, but the next time I got on it , it would be a misfire. Drove me crazy thinking it was the wires, coil pack, after about $60 worth of plugs I figured out what was going on. (AT least in MY case.) I put the 104's in & I'm good to go until the weather cool's off.

Now coming to think about it the Tr-6's may be ok If I take some more fuel out. With the TT Chip I can only take fuel out 1st gear or WOT. not in between where I needed it.
I'm at 25 psi now and no problems haven't been to the track yet. I may be awhile. I need some new gears, and tires, Mickey T's aren't cheap anymore.

 

[bison]

The common r42ts/cr42ts, autolite 103, ngk ur5 and autolite 23, etc for aluminum heads wont foul unless there is a long term rim condition and are all fine up to 700hp. There is really no advantage to other plugs in street driven applications making 700hp or less. I still run autolite 23 at 800hp. If I was going to run it for all it's worth with 116+ octane I'd use a non projected plug. For 99.9% they are a waste and offer no advantage.

 

[jpwalt1987]

The common r42ts/cr42ts, autolite 103, ngk ur5 and autolite 23, etc for aluminum heads wont foul unless there is a long term rim condition and are all fine up to 700hp. There is really no advantage to other plugs in street driven applications making 700hp or less. I still run autolite 23 at 800hp. If I was going to run it for all it's worth with 116+ octane I'd use a non projected plug. For 99.9% they are a waste and offer no advantage.

Which ones are a non projected tip plug? I am sorting through the tune trying to get the motor happy by reading the plugs and comparing to what the wideband says. The ngk tr6 plugs look hotter than the autolite 103s and 3922s after cutting of the threaded portion.

 

[jragracer]

autolite 23 works for me,of course we run high octane feul,,

 

[haywire4130]

The common r42ts/cr42ts, autolite 103, ngk ur5 and autolite 23, etc for aluminum heads wont foul unless there is a long term rim condition and are all fine up to 700hp. There is really no advantage to other plugs in street driven applications making 700hp or less. I still run autolite 23 at 800hp. If I was going to run it for all it's worth with 116+ octane I'd use a non projected plug. For 99.9% they are a waste and offer no advantage.

In ac plugs, 42 vs 43 which is hotter/colder?, i use cr43ts, no issues except after 7k miles i started getting a popping at wot in 3rd, the gaps ended up being .010 larger than when i put em in and the alky was putting out the fire. I'm used to ngk numbers with lower meaning hotter and was just wondering

 

[bison]

In ac plugs, 42 vs 43 which is hotter/colder?, i use cr43ts, no issues except after 7k miles i started getting a popping at wot in 3rd, the gaps ended up being .010 larger than when i put em in and the alky was putting out the fire. I'm used to ngk numbers with lower meaning hotter and was just wondering

AC numbers are the opposite of ngk

 

[87GN 98GTP]

ngk the higher the colder