20 psi on stock 4g63t ?

**cmspaz** · 06-13-2009

CEL I'm guessing is something along the lines of fuel trim malfunction. You get it when the ECU is trying to adjust fuel maps past the 12% is allowed to adjust them to compensate for the excess airflow.

The stock fuel cut level is really generous, and the fuel pump can fairly easily handle 20psi to redline. But with stock injectors? Don't push your luck. I wouldn't go past 15psi max.

**Shane@DBPerformance** · 06-13-2009

Quote:

Originally Posted by cmspaz

CEL I'm guessing is something along the lines of fuel trim malfunction. You get it when the ECU is trying to adjust fuel maps past the 12% is allowed to adjust them to compensate for the excess airflow.

Not on a 1G. They only throw CELs when something is broke broke. Could be a general CEL for failed O2 sensor though.

The stock injectors will support enough power for just about any 14B and a many 16G cars, but they can't do it without a modified ECU. You will hit fuel cut or the stupid IPW cap that the factory ECU has before you make full use of the injectors.