Limits?? (A/F ratio)

[RedHeartbeat]

Now would be a good time for someone to post a link on how to read sparkplugs to see if you have the correct AFR.

[DBRODS]

Here are a couple pics of what my plugs look like with the Direct Port setup on the 200 shot. On these pics we had a few too many degrees of timing. But the fuel ring and heat is very happy.. Here is a link for a good read on plugs. Also on this page there are some more good links at the bottom.
Spark Plug Reading 101 by Mike Canter

[PurpleMinivan]

Read your plugs... Use the wideband as just a reference to where YOU OR YOUR TUNER found that your motor is happy at. All tunes on motor setups are different even if they're mirror image setups.(same motor, heads, cam, intake, headers, exhaust, trans, verter, gears, etc. etc....)

^^^The AFR on Jon's truck is at 12.5 on a 200 shot... that's where the plugs show it's "happy spot" is. Too fat of an AFR on N20 will kill a motor fast also.