I am having a littel problem finding out which plug to use and your help is very much appreciated.

I am currently running a 2.70 upper, 8# lower, ported Eaton, ported upper plenum SBTB, spacer, LT's no cats, MSD ignition, and gobs of other mods but the main problem I am having is with my nitrous/propane set-up.


I am using a NOS wet kit with 100 jets and using propane as the fuel alternative, the kit works great but the plugs are not holding up. I fried IT-22's gapped at .34. I fried TR-6's gapped at .32 and fried Autolite AR-93's... All the plugs worked great on the normal set-up but only last about 3-5 sprays with the combo....I have TR-55ix's in now...All the plugs work fine with my SMC kit as well....



Am I gapping to small??
Am I using too hot of plugs??


I am scratching my head here, trying to find a plug that meets my daily street tune with my nitrous/propane tune...Is that possible? I have had some rough idles but I can live with those....



Only good thing with this is that I can now swap plugs in under an hour......!


Any help is greatly appreciated!!


Jonathan

 

got any pics of the plugs? i'd like to see how they failed. the autolite plugs are a pretty strong plug. could it be from detonation? or just being hard on the plug?

 

I will try to get some plug pics for you guys soon....I dont believe its from detonation....how else could I be hard on the plugs??

 

I can't honestly say or recommend for your set up, but have you looked into the silvertips - Beru S1K's? I run them and have had awesome response from them for the last 3000 miles. I tried the 22's and 93's, but had a much smoother throttle response with the S1K's. Absolutely no complaints.

I am not juicing it, but I have the KB at 16lbs boost, a/f is hot out of the gate in the high 14's immediately dropping to 12.1 and leveling - so it isn't necessarily a cool walk in the park for my 5.4.

Just worth looking into I think. My choice to move to the Beru's was on the advice of my tuner, I am certainly not a guru when it comes to plugs.

D-Day

 

Not to hijack your thread but I have new factory plugs that were put in during my sprk plug ejection warranty. I had TR^'s in it before. I just added a 4lb lower and wonder if I really need o get the stock "factory" plugs out?

 

Well, I d/k anything about NOS or propane but you certainly need a colder plug. I have had

 

Well, I d/k anything about NOS or propane but you certainly need a colder plug. I have had NGK BR7EF's in for about 30K and they work fine. They are the next step colder than the TR6's.

Dan

 

Thanks guys. I will try and get more info on the Berus...I have heard of them but never gave them a shot. I think I will try the BR-7's and see how they like it. If not I will have to keep scratching my head. Pics are coming for sure though.

Dan_03Lightning...Thanks for the info!!