Spark Plugs & AFR changes

NoDOHC · 03-01-2011, 10:59 PM

So the hotter type plug does a worse job. Interesting... I will have to think about why this might be.

For clarification:
Were you running Water injection?
Was this completely under boost, or did it exhibit the same behavior under vacuum/idle?

I have seen mileage improve by changing heat ranges, but I thought I went to a hotter plug to improve the economy. I apologize - unlike your awesome data acquisition systems, I have to rely on my ever-more-sketchy memory.

I will think about what would cause this and post again if I can think of something.

03-01-2011, 10:59 PM	#4
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin Posts: 855 Rep Power: 18	So the hotter type plug does a worse job. Interesting... I will have to think about why this might be. For clarification: Were you running Water injection? Was this completely under boost, or did it exhibit the same behavior under vacuum/idle? I have seen mileage improve by changing heat ranges, but I thought I went to a hotter plug to improve the economy. I apologize - unlike your awesome data acquisition systems, I have to rely on my ever-more-sketchy memory. I will think about what would cause this and post again if I can think of something. __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)