Iridium plug gapping - ZR-1 Net Registry Forums

Peaven · 08-12-2006

Just picked up a set of TR55IX plugs....NGK has them gapped at .059 and says to leave them there...LT5 specs of course say .050, so....which one is right?

Anybody that has theses plugs got any insight....Uly?

Thanks for the help gang.

blackjack · 08-13-2006

im sure the ngk big boss doesnt know what a zr-1 is....the gm service manual says .035...the wider the gap,the harder it is for the coil to fire the plug,to the point of misfire,specially the newer plugs with so-called precious metal,which is good for long life,buut not so good for conductivity...i gap my ngk at .040,no mo'
blackjack
91/1735

guinnessdood · 08-13-2006

Quote:

Originally Posted by Peaven

Just picked up a set of TR55IX plugs....NGK has them gapped at .059 and says to leave them there...LT5 specs of course say .050, so....which one is right?

Anybody that has theses plugs got any insight....Uly?

Thanks for the help gang.

I have the same plugs but cannot remember for the life of me the correct gap. Call Corey Henderson and he will tell you... 210-867-6286. If you are running the stock coils and the original or stock wires I would gap them at no more than .045. If you have better wires and/or coild you could go out to .055-.060....so my research tells me...

Peaven · 08-14-2006

Thanks guys

....I think the 90-92 LT5's spec gap is .035 but the 93-95's get the gap spec'd at .050, no?

I'll either call Corey or Marc Haibeck tomorrow, thanks for the phone# Uly.

08-12-2006	#1
Peaven Join Date: Jul 2006 Location: Omaha, NE Posts: 322	Iridium plug gapping Just picked up a set of TR55IX plugs....NGK has them gapped at .059 and says to leave them there...LT5 specs of course say .050, so....which one is right? Anybody that has theses plugs got any insight....Uly? Thanks for the help gang. __________________ SteveB '94 ABZ Lucky #13-SOLD

08-13-2006	#2
blackjack Join Date: Aug 2005 Location: north of montreal Posts: 510	Re: Iridium plug gapping im sure the ngk big boss doesnt know what a zr-1 is....the gm service manual says .035...the wider the gap,the harder it is for the coil to fire the plug,to the point of misfire,specially the newer plugs with so-called precious metal,which is good for long life,buut not so good for conductivity...i gap my ngk at .040,no mo' blackjack 91/1735

08-14-2006	#4
Peaven Join Date: Jul 2006 Location: Omaha, NE Posts: 322	Re: Iridium plug gapping Thanks guys ....I think the 90-92 LT5's spec gap is .035 but the 93-95's get the gap spec'd at .050, no? I'll either call Corey or Marc Haibeck tomorrow, thanks for the phone# Uly. __________________ SteveB '94 ABZ Lucky #13-SOLD