Double scaled MAF table?
11-06-2008, 11:40 AM
#1
Double scaled MAF table? Have you guys ever had to double scale your MAF table, one (low frequency end) for normal driving & one (high frequency end) for WOT?
Am tuning a new intake & the linearly scaled MAF table is spot on under normal driving conditions & has been confirmed by noting idle STFT's. However, the same scaling (top end) during WOT is way off & produces an A/F ratio 1.3:1 leaner than it should be. I also know that the logged airflow is way off (low), by as much as 130 g/s, thereby causing the injectors to operate @ a lower % than is required during WOT. So, everything points to the top end scaling of MAF table. Even modified the PE table & made a run to see if it would help. It did not because of the measured (incorrect) airflow.
FYI, went from a ported Weiand to a modified LS6 intake. Started w/ the MAF table used on the Weiand. The idle & normal driving are the same. The WOT is way off. Even cleaned the MAF to be sure that dirt wasn't the cause.
So, I am thinking of leaving the low end frequency alone, & modifying the top half of the table.
Comments please.
Am tuning a new intake & the linearly scaled MAF table is spot on under normal driving conditions & has been confirmed by noting idle STFT's. However, the same scaling (top end) during WOT is way off & produces an A/F ratio 1.3:1 leaner than it should be. I also know that the logged airflow is way off (low), by as much as 130 g/s, thereby causing the injectors to operate @ a lower % than is required during WOT. So, everything points to the top end scaling of MAF table. Even modified the PE table & made a run to see if it would help. It did not because of the measured (incorrect) airflow.
FYI, went from a ported Weiand to a modified LS6 intake. Started w/ the MAF table used on the Weiand. The idle & normal driving are the same. The WOT is way off. Even cleaned the MAF to be sure that dirt wasn't the cause.
So, I am thinking of leaving the low end frequency alone, & modifying the top half of the table.
Comments please.
