Make sure to keep it much richer than 14.7:1 under boost or you run the risk of melting the pistons on an extended high boost pull. Shoot for somewhere in the 11.8-12.3 range in open loop. The ECU will do everything it can to keep the A/F ratio at 14.7:1 in closed loop.

You say you were able to get the A/F ratio down to 12:1; did it still ping?


2000 4Runner | 5-speed | E-locker | Tundra/OME 2" lift | Stubbs Sliders | Deckplate/TrueFlow |