TheSloMoShow
NAXJA Forum User
- Location
- Columbus,OH
Good evening everyone,
I was curious how one would determine the appropriate impact to your STFT & LTFT based on a new set of injectors you install.
For example, does an injector set that is either 10% lower or 10% higher in fuel flow rating (at same rail pressure of 49psi, 2001 XJ here) mean the LTFT's should indicate 10% in either direction pending whether or not the injectors you bought are smaller or larger?
I have installed Bosch's 4-pin hole 280155784's.
From what I've read, some say they are nearly identical (~22.6lbs/hr) in fuel flow rating as stock spec and some say as heavy as 24.9lbs/hr.
So I'm curious what LTFT's I should really expect from this set, assuming that the LTFT's should vary a bit from the LTFT's I was used to seeing with the stock set in the Jeep (~ +/- 3%).
My main purpose for asking this question is that LTFT's currently are about -7% or -8%. I've been battling what I thought was erroneous O2 sensors, but if these LTFT readings seem OK for this injector set, then potentially the O2's are A-Ok.
I was curious how one would determine the appropriate impact to your STFT & LTFT based on a new set of injectors you install.
For example, does an injector set that is either 10% lower or 10% higher in fuel flow rating (at same rail pressure of 49psi, 2001 XJ here) mean the LTFT's should indicate 10% in either direction pending whether or not the injectors you bought are smaller or larger?
I have installed Bosch's 4-pin hole 280155784's.
From what I've read, some say they are nearly identical (~22.6lbs/hr) in fuel flow rating as stock spec and some say as heavy as 24.9lbs/hr.
So I'm curious what LTFT's I should really expect from this set, assuming that the LTFT's should vary a bit from the LTFT's I was used to seeing with the stock set in the Jeep (~ +/- 3%).
My main purpose for asking this question is that LTFT's currently are about -7% or -8%. I've been battling what I thought was erroneous O2 sensors, but if these LTFT readings seem OK for this injector set, then potentially the O2's are A-Ok.