LS1 increasing injector open time

[Eevo]

Hi guys, i hope this is the right section.

im doing an engine conversion on my land rover discovery 2.
out with the 4.0l rover v8 and in the 5.7 LS1.

the disco 2 has a static fuel pressure of 50psi.
the LS1 has a static fuel pressure of 58psi.
that's a 16% difference.

can I just retune the LS1 injectors to be open for 16% longer to make up the correct fuel amount?


cheers

 

[07GTS]

the correct way is to change the injector data "injector flow v kpa Vac" to suit the new line pressure, or put a adjustable reg on it and set it to 58psi

 

[Eevo]

so you tell the ecu to expect a different pressure and the ecu does the rest and compensate.
thats pretty cool.

 

[2INIL8]

It does not compensate,you put in the correct figures for injectors and fuel pressure
and the Fuel/ve table will most likely need a bit of work.

 

[07GTS]

when changing fuel pressure the VE table or maf table can be adjusted as a whole by a percentage to correct it back to very close fueling but its worth checking with a WB just encase, at the moment your fueling is based on 58psi so if u lower it and then let the ecu know its lower for the injectors because the ecu needs to know the difference between line pressure and manifold vacuum then u still have the same fueling for the higher pressure in the VE/MAF so u just have to increase that to suit also, then because its all done right u should have consistent fueling

 

[Eevo]

awesome.
i'll let you know how i go