Earlier today I met up with somebody on a local web forum to drive their AEM-equipped 3000GT VR4 to help diagnose a steering problem. Going into my first corner I noticed their wideband reading too rich for for their sensor to pick up. The car was alternating between spitting fireballs and attempting to stall.

The problem? In tuning their VR4 they had never tried engine braking near redline and their tune didn’t have any correction for it. Ten minutes later, everythingw as adjusted and the car felt as smooth as a 3/S with an AEM should feel. So, lesson learned: When tuning your car’s ECU, it might be helpful to let somebody else drive your car to find any holes in your driving style!