nx_black97

I am currently running autolite 103 plug gapped at .035 the first set i changed was after first time at track i forgot to take my nitrous tune off and put in my motor tune. Now that i am just running motor for bracket racing I'm thinking that these 103s are just simply too cold. I have made 8 passes on these plugs and they are fouled already i don't really think its the tune because 7 passes before that it would've fouled out and today i went to the track, and the car did burnout perfectly and was running good go to stage and starts running like ****. Car wouldn't go of course, so i got back to the trailer and sure enough the plugs are done. I am 12.5:1 compression running vp 110 trick flow aluminum heads, was wondering what kinda plug to run for NA I know these autolites will do fine on nitrous.
Thanks for the input

bowtienut

iTrader: (1)

Autolite 104's worked great for me with 12.0:1 CR.
I've also run 103's for extended high power running, and they worked just fine.
I think you have a tune issue. I've left BR7EF's in the car after running nitrous and made 20-30 dragstrip passes without fouling them.

96capricemgr

iTrader: (1)

Agreed.

nx_black97

i think its running a bit rich putting a wideband in the car this week and gonna check things out thanks for the input

nx_black97

turned the fuel pressure down from 40psi to 35 psi and that seemed to help with the car launching and think i got the idling situation straightened out. the car was idling fine before the plugs went bad then they went bad and now it didnt want to idle with new plugs not real sure but it idled a little better today.

bufmatmuslepants

iTrader: (3)

Why did you turn the fuel pressure down instead of having it properly tuned?

nx_black97

To see if it really was running to rich and it was then I went back and took fuel out in the pe table!