gboson wrote:I recently installed an AEM Wideband and A/F ratio at idle was averaged to be 14.7±0.2 and 10.0 at WOT. The WOT A/F ratio seems to be quite rich which prompted my question regarding running LOWER than stock boost pressures and its effect on the ability of the ECU to compensate effectively.
Prompt replies and any knowledgeable insight will be hugely appreciated.
Thanks in advance!
That's quite rich under wot.
It can be a number of things: Dirty MAF, bad tune, boost leaks.
Do you have anyway to datalog the ecu?
Running low boost would not be a problem. If you have a boost leak that is causing you to only run at 10psi then you have a problem. What's happening is that the MAF is measuring the air. If their is a leak somewhere (after the MAF) then the problem arises that the ECU is commanding fuel for MORE air than what is actually in the combustion cycle. Hence rich.
Do simple things first like a boost leak test and clean the maf.
Any mechanic or DIYer with a air compressor can do it easy.