ethand

Anyone running a F/A gauge in their track car? I recently installed one and seem to be in the mid 14's on the ratio. I was always taught you want to be in the 12.5:1 or so range when under acceleration. Concerned I am down on power and running lean.

When researching, I found an article about Boxster 101 and it mentioned 14.5:1 ratio

Confused now and looking for input.

Thanks

extanker

are you running a stock ECM ? are your o2 sensors commanding in closed loop ?

Macster

The DME tries to keep the air/fuel ratio around 14.7:1. At this ratio of air to fuel a healthy engine generates exhaust gases that are most completely processed by a healthy 3-way converter.

Under hard acceleration, as in (nearly) pedal to the floor (actually based on my observations it takes pedal to the floor) the DME can switch to open loop mode and provide a richer mixture, down around 13:1 or wherever the engine makes the most torque. The DME will only maintain this richer fueling under hard acceleration.

But except for hard acceleration the air fuel ratio is around 14.7:1.