Long term fuel trims not changing
#1
Long term fuel trims not changing
STFT, LTFT ,RPM, TPS
-9.0, -11.0, 2750.0, 18.47
,-6.0, -11.0, 2746.0, 18.47
,-3.0, -11.0, 2738.0, 18.47
-3.0, -11.0, 2746.0, 18.47
-5.0, -11.0, 2746.0, 18.47
-4.0, -11.0, 2742.0, 18.47
-2.0, -11.0, 2734.0, 18.47
-5.0, -11.0, 2738.0, 18.47
-5.0, -11.0, 2738.0, 18.47
-2.0, -11.0, 2730.0, 18.47
-4.0, -11.0, 2730.0, 18.47
-5.0, -12.0, 2734.0, 18.47
Here is an idea of what my fuel trims are running. My LTFT dont change from -11 or -12. Even when on the throttle or at dofferent loads including idle. The STFT are pretty good and stay +10-10 at idle and cruise.
I am know running PTE 780's sized at 665
latency is
4.6875 3.312
7.03125 2.184
9.375 1.368
11.7188 1.344
14.0625 .888
16.4062 .408
18.6768 .288
Any comments, recommendations greatly appreciated.
-9.0, -11.0, 2750.0, 18.47
,-6.0, -11.0, 2746.0, 18.47
,-3.0, -11.0, 2738.0, 18.47
-3.0, -11.0, 2746.0, 18.47
-5.0, -11.0, 2746.0, 18.47
-4.0, -11.0, 2742.0, 18.47
-2.0, -11.0, 2734.0, 18.47
-5.0, -11.0, 2738.0, 18.47
-5.0, -11.0, 2738.0, 18.47
-2.0, -11.0, 2730.0, 18.47
-4.0, -11.0, 2730.0, 18.47
-5.0, -12.0, 2734.0, 18.47
Here is an idea of what my fuel trims are running. My LTFT dont change from -11 or -12. Even when on the throttle or at dofferent loads including idle. The STFT are pretty good and stay +10-10 at idle and cruise.
I am know running PTE 780's sized at 665
latency is
4.6875 3.312
7.03125 2.184
9.375 1.368
11.7188 1.344
14.0625 .888
16.4062 .408
18.6768 .288
Any comments, recommendations greatly appreciated.
#4
Evolved Member
iTrader: (2)
If your STFT are around 0, then your LTFT won't move. That is the value that it will stay at. Since, yours are -11/-12, this means the ECU is taking out 11% of fuel to keep a stoich ratio.
You should scale your injectors to a larger number to shorten the pulsewidth that the ECU keeps them open for.
If you do this, keep in mind that you WOT/open loop fueling maps will need to be adjusted, too.
Eric
You should scale your injectors to a larger number to shorten the pulsewidth that the ECU keeps them open for.
If you do this, keep in mind that you WOT/open loop fueling maps will need to be adjusted, too.
Eric
#5
I am still working on scaling my injectors. I had Denso 720's and switched to Precision 780's and made 2 different adjustments on the 780's and it already runs better than the Denso's. The Denso's I tried about 20 different settings and they suck ***.
I am going to sea tommorrow for the week so I wont get another chance to mess with it til Sat.
Thanks for the input guys.
I am going to sea tommorrow for the week so I wont get another chance to mess with it til Sat.
Thanks for the input guys.
Thread
Thread Starter
Forum
Replies
Last Post
mrfred
ECU Flash
496
Sep 14, 2022 07:08 PM