A/F ratio/boost issue?

[acehigh99]

Hey eveyone, so I just installed an aeroforce intercepter gauge and have been looking at different data. When I lift off the gas my A/F ratio will read 29.3 and then stick for a few seconds, or until i press on the gas and then read 14.7. This is around cruising, at WOT it'll read around 10-11. Does this sound right? Is it jumping to 29.3 because of the influx of air and causing the sensor to freeze up?

ALso my boost has been peaking to around 18-20 at WOT, but is really all over the place, not really sure if im leaking. How would a boost leak be seen on a boost gauge? By not peaking to a desired range or from drastic drops at WOT? Thanks for any input!

 

[Sport6]

The air fuel ratio is fine. Cruising with light throttle will result in a 14.7afr. The 29.3 is also fine as when you let off the gas the car cuts off the fuel so the sensor is only reading air coming through, which is perfectly normal.

Since you have a hypertech tune 18-20 at WOT is also fine, it will probably spike to that and taper down as the RPMs climb as we have a small turbo.

 

[acehigh99]

The air fuel ratio is fine. Cruising with light throttle will result in a 14.7afr. The 29.3 is also fine as when you let off the gas the car cuts off the fuel so the sensor is only reading air coming through, which is perfectly normal.

Since you have a hypertech tune 18-20 at WOT is also fine, it will probably spike to that and taper down as the RPMs climb as we have a small turbo.

cool, thanks for the input, the car seems to running great. Only problem is the car begs to be driven hard and i can't afford to get another ticket!

 

[Chris@Hypertech]

ALso my boost has been peaking to around 18-20 at WOT, but is really all over the place, not really sure if im leaking. How would a boost leak be seen on a boost gauge? By not peaking to a desired range or from drastic drops at WOT? Thanks for any input!

With the Hypertech tune, we focused on maintaining turbocharger efficiency, rather than a steady boost level. With a steady boost level, there is only slightly more power gained by holding boost steady, and testing showed much less repeatable, dependable power. This was a result of pushing the turbocharger past its optimal efficiency range. 19 psi is ok for that turbo at low RPM's, but they can't hold that kind of boost pressure at the upper RPM range. With our boost curve, the turbocharger still has room to provide optimal boost without working past its efficiency range.

The thing to remember is that more boost doesnt always equal more power. The turbo can only flow so much air. The higher the boost, the hotter the air. The trick is finding the optimal boost to keep the airflow efficient. This cant be done at one boost level. The boost level must be tuned differently as the engine load changes, the RPM's change, and the physical 2.3L of displacement pumps faster and faster and demands more and more airflow.


Chris