Reading spark plugs ?

cad · 04-12-2011, 10:04 PM

FWIW....We learned a lot on our local chassis dyno. We used the shop's O2 sensor in my O2 sensor bung. I do have headers extensions on my super comps. The key is...we took our Computech weather station with us and documented the CF, DA, etc. We jetted for 13.0 AFR. Now, we run the jet program on the Computech and it tells is whether we need to go up or down 1-2 jet sizes. We dyno'd at 2600' DA (dont remember the CF at the moment), and now we have our baseline. We know if we'll slow down or pick up based on the weather if we dont change jets. It took 2 hours and $150 which beats beating our head against the wall trying to repeat testing on the track for old school mph jetting.
IMO, reading the plugs is hit and miss. I only read them for the heat stripe (hot/cold) and base ring for jetting.

Clark

04-12-2011, 10:04 PM	#6
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 703 Likes: 203 Liked 93 Times in 52 Posts	Re: Reading spark plugs ? FWIW....We learned a lot on our local chassis dyno. We used the shop's O2 sensor in my O2 sensor bung. I do have headers extensions on my super comps. The key is...we took our Computech weather station with us and documented the CF, DA, etc. We jetted for 13.0 AFR. Now, we run the jet program on the Computech and it tells is whether we need to go up or down 1-2 jet sizes. We dyno'd at 2600' DA (dont remember the CF at the moment), and now we have our baseline. We know if we'll slow down or pick up based on the weather if we dont change jets. It took 2 hours and $150 which beats beating our head against the wall trying to repeat testing on the track for old school mph jetting. IMO, reading the plugs is hit and miss. I only read them for the heat stripe (hot/cold) and base ring for jetting. Clark Last edited by cad; 04-12-2011 at 10:41 PM.