LS1 to LS6 injector tuning changes

[QBRacing74]

Hey all.
I have changed the injectors in my engine from the 26lb LS1 units to the 29lb LS6 units.
In the fuel/general tab in HPTuners what fields need changing (other than below)

• Flowrate vs KPA
• Short Pulse Limit
• Min Injector Pulse
• Default Injector Pulse
• Offset Vs Volts vs VAC
• Short Pulse Adder

Does anyone have a stock LS6 tune file that I can copy the fields from (or) can someone confirm if they are as follows...
Flowrate vs KPA = 3.671875 3.6953125 3.71875 3.7421875 3.765625 3.78125 3.8046875 3.828125 3.8515625 3.875 3.8984375 3.9140625 3.9375 3.9609375 3.9765625 4 4.0234375
Short Pulse Limit = 3.921
Min Injector Pulse = 1.246
Default Injector Pulse = 1.246
Offset Vs Volts vs VAC = long table
Short Pulse Adder = long table

Cheers
Quintin

[LSandlteditor]

Download a 2004 corvette z06 stock file and compare to yours. Everything under general, Fuel tab should be copied over. If you need more help, contact me

[QBRacing74]

Thanks

[2xLS1]

01-02 F-bodies LS1 and 01-04 Vette LS1 and 02-04 LS6 both use the exact same injector. Same part number. Both calibrated by GM engineers. Different injector data for each vehicle type. Just throwing this out there.

[It Will Run.Maybe]

correct me if im wrong but the tunes are different because f bodies have fuel return from the fuel rail and vettes have single line at fuel rail (returnless)and do return from the filter

[Oleblu]

used a fuel filter/regulator which has the return port built within the filter itself. It used to be regularly used for ls swaps and some still do use them. While they do return at the filter its still a regulated flow rate. And doesn't require a rising injector flow rate. Very possible im wrong also....

[2xLS1]

correct me if im wrong but the tunes are different because f bodies have fuel return from the fuel rail and vettes have single line at fuel rail (returnless)and do return from the filter

Nope 98-02 F-body LS1 have a returnless fuel rail. If they did their IFR would have no slope but they do. Both use a sloped IFR and they are not different by much, but different .4-.5 lb/hr in the IFR. Ok so they maybe have different fuel pressure because one regulator is in the tank and one is in the filter. So then explain why the Offset VS Volts is different, Short Pulse Adder is different, Minimum Injector Pulse is different, Default injector pulse is different. These are injector characterizations that wouldn't change with slight different fuel pressure. I guess the point I'm trying to make is people go ape shit about not having exact injector data yet here we have the same injectors used in two different platforms using the same OS from the same OEM with different characterizations. Just saying.

[blindsquirrel]

An example with less potential for ambiguity. The only differences are cylinder bore and cam profile (5.3L has DOD/AFM). Same pump, lines, rails, injectors, intake, throttle body, air filter, MAF, wiring harness, alternator...

2006 Trailblazer 5.3 1GNET16M466118580 1212321883.hpt
2006 Trailblazer 6.0 1GNET13H762320408 84701868.hpt

Some tables have insignificant differences but others like the Offset tables are pretty radically different.

Sometimes the same injectors (12580681) used in the same platform with the same fuel system get different injector data. Maybe the two cals were done by two different teams who had different ways to approach things, or maybe it was the same team doing it on different days trying to solve a different set of problems. Who knows.