i've been boosted for a while with the basic drag kit inline pump and fmu


the car feels strong lowend, but will not pull much after about 4500 rpm

i noticed the narrowband af gauge sticks at around 13:1 when in full throttle
(when it was NA the narrowband went to 10:1 at full throttle)

should i be concerned?. been babing it ever since to preserve the motor.

advice

comments ? thanks in advance

 

I think its definitely inaccurate if it was showing 10:1 naturally aspirated.

Try borrowing a wideband or pay for an hour of dyno time to find out what the car is really doing. If it is 13:1 under boost that is too lean.

And you would be a lot happier with the car if you can get rid of the FMU and get some sort of management that allows fuel and timing contol. Your motor will love you for it too.

 

the narrow band uses a 0-1v scale which is only accurate for stoich (if that). Just get a wideband or pay for some dyno time

 

 

narrowband o2 = pretty lights

wideband o2 = air/fuel ratio

get a wideband or get some dyno time to make sure ur afs are good. I suggest plxm300 for wb02