SC 4.8 stops fueling at 100 kpa

[chrose8]

Gen III 4.8 with 1.85 Eaton , LSA injectors , 2 bar (12615136) SD.
Vehicle cuts out at / above (stops fueling ) 100 kpa .
Manifold pressured fuel regulator stays above 58 psi.
Right when the fun is going to start it shoots from 85 kpa to nothing and justs starts burbling until I cycle the ignition...
then it runs just fine till 100 kpa.

Am I missing some parameter? here.....Thanks.

[5FDP]

Couple things.

Cylinder volume is wrong for a 4.8, change that so all fueling calculation will be correct.

Injector data is wrong for LSA injectors. Those are 56lb/hr if I remember right and you only have values of 36ish in there. So the rest of your data is wrong as well for min injector pulse, short pulse adder and offset data.

You need to use the LS3 to LS1 style spreadsheet to paste in the LSA data and have it spit out in LS1 values.

The data log has a P0068 code, go into the engine diag tab and raise the P1514/0068 table way up to stop it from tripping.


Lots of other stuff needs attention before you even think about getting into boost. The PE table and BE tables need to be setup right for boost. Those big delays need to go bye bye and the commanded fueling need to be brought down to what AFR you want to run. The PE is richer than the BE so it's going to use that, you'll likely want to reverse that. Remove the 5,500rpm delay, raise the MAP kpa for PE up to 90-95kpa.

The spark stuff will want to be adjusted too. There is a base spark adder that adds in a bunch of timing, be careful of that or just zero it out and set your regular spark timing tables to the timing you want.

[chrose8]

Couple things.

Cylinder volume is wrong for a 4.8, change that so all fueling calculation will be correct.

Injector data is wrong for LSA injectors. Those are 56lb/hr if I remember right and you only have values of 36ish in there. So the rest of your data is wrong as well for min injector pulse, short pulse adder and offset data.

You need to use the LS3 to LS1 style spreadsheet to paste in the LSA data and have it spit out in LS1 values.

The data log has a P0068 code, go into the engine diag tab and raise the P1514/0068 table way up to stop it from tripping.


Lots of other stuff needs attention before you even think about getting into boost. The PE table and BE tables need to be setup right for boost. Those big delays need to go bye bye and the commanded fueling need to be brought down to what AFR you want to run. The PE is richer than the BE so it's going to use that, you'll likely want to reverse that. Remove the 5,500rpm delay, raise the MAP kpa for PE up to 90-95kpa.

The spark stuff will want to be adjusted too. There is a base spark adder that adds in a bunch of timing, be careful of that or just zero it out and set your regular spark timing tables to the timing you want.