CRASHANDBURN_01

I have a 78 chevy pickup that I have done an 89 tpi conversion on. 355 10.5:1 comp with factory tpi iron heads, lunati voodoo cam, modified 24 lb injectors from ls1 (28lb at 60 psi), long tubes, factory intake and tb, no vss, no tcc, 700r4 trans w/ 2200 stall, running moates chip adapter with tp v5 running 165 ecm with $6e mask. innovate lc-1 wideband with simulated o2 going to computer and wideband gauge installed in dash

I have been tuning on this truck off and on for a year trying to dial it in and have had alot of success, but still have a few hiccups to iron out. My question is, I have a rich decel issue that is plaguing me. My blms from tables 1-3 are spot on 126-130 during cruise and light throttle but during decel from cruise my blms drop to 108 and wb indicates 12-13:1 afr causing my next acceleration to begin lean 16.5-17:1 afr because of the stored low blms. I have tried messing with the dfco and decel enleanment settings but still seem to have the rich decel. Is my lack of a vss causing this problem or do I need to keep working with the decel enleanment and dfco settings to correct the problem. Its a cruiser and doesnt really get driven aggressively enough for the dfco to kick in much (usually no higher rpm decels) except maybe slowing from highway speed but haven't seen much reaction from changes in decel enleanment settings

RBob

iTrader: (1)

The excess rich on decel is likely being caused by not having the correct injector compensation values.

You should be able to move the BLM cell boundaries a bit to get the ECM out of the cell being used for decel as soon as the throttle is re-opened.

RBob.

CRASHANDBURN_01

This problem causes the blms to hit multiple cells during decel as it will do it from 3000rpm all the way down to idle. In the 6e mask, I only have 6 scalars for blm cell upper boundries. 3 for rpm and 3 for airflow. How would I set them to not hit the same cells on easy take off as my rpms and airflow are almost identical in this situation. The rich condition should not be there on decel so I'd prefer not to tune around it, rather to fix what is wrong with my decel fueling. Also I have no option for injector compensation as the bpw vs load table was deleted for 6e. My injectors are scaled properly for the injectors I am running and by blms are 126-130 throughout except on decel they shoot for 108.

RBob

iTrader: (1)

Injector compensation tables:

As for the BLM cell boundaries, those six values are the ones to use. Look at the airflow in a log file to see what can be done to move the cell boundaries at the lowest seen airflow.

RBob.