INJ Duty (%) drops off @ 5.500 rpm

[MKYBIZ]

Hello,

the INJ Duty drops off at around 5.500 rpm.
max INJ Duty is 53%, in older logs its rising up to approx. 70% @ 6.600 rpm.

Engine is a Gen 2 5.0GT - stock.

Are the injectors defect ?

inj_duty_max53.jpg

[SultanHassanMasTuning]

whats your Lambda / wideband reading

[MKYBIZ]

0,85 @ 2.500rpm drops to 0,82 @6.500rpm
over 6.500rpm it drops down 0,75 because of catalyst temp

here`s the complete log.
20220515_log_stock.hpl

[MKYBIZ]

Any ideas ?

[veeefour]

Your maf transfer is probably fookd

[Ruiner46]

You're logging too many parameters or your polling interval is too low. The chart is misleading because it interpolates between samples. If you look at injector pulse width, you only got 4 samples of the pulse width in the entire time that you were full throttle. The duty cycle is a math calculation with RPM in the equation, so it looks smooth, but there are only 4 discrete samples of actual injector pulse width, so it's totally inaccurate. In this picture, I circled in red where the pulse width updates happen. The chart display will just draw lines between the points, but that isn't what's actually happening. Remove a ton of unnecessary parameters and increase the polling interval of pulse width to the fastest setting and you will get better data.

pw samples.PNG

[engineermike]

Excellent, ruiner.

[MKYBIZ]

You're logging too many parameters or your polling interval is too low. The chart is misleading because it interpolates between samples. If you look at injector pulse width, you only got 4 samples of the pulse width in the entire time that you were full throttle. The duty cycle is a math calculation with RPM in the equation, so it looks smooth, but there are only 4 discrete samples of actual injector pulse width, so it's totally inaccurate. In this picture, I circled in red where the pulse width updates happen. The chart display will just draw lines between the points, but that isn't what's actually happening. Remove a ton of unnecessary parameters and increase the polling interval of pulse width to the fastest setting and you will get better data.

pw samples.PNG

Thx a lot, already started yesterday to clean up logging parameters. Any recommendations for max parameters ?