FAST 102mm LSXR with billet LS1 rails?
03-05-2010, 12:29 PM
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FAST 102mm LSXR with billet LS1 rails? I'm considering buying an LSXR 102mm intake for my 408. I currently am running Speed Inc billet fuel rails with 42# Racetronix injectors. I don't really want to go through the hassle of buying new rails and injectors just to use the new intake. I see lots of posts stating the use of LS2 rails and spacers. Is the rail height the only difference between the LS1 and LS2 fuel rails or are the mounting points or injector locations different?
03-05-2010, 07:10 PM
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Fuel Rails You can run the Speed Inc fuel rails. youll have to adjust the mounting bracket that mounts from the intake to fuel rail, simple really.
I am running the LS2/LS3 fuel rail and FIC LS2 42lbs injectors with wiring harness adapters, in this case its a bolt on and go fuel system no spacers needed.
The injectors length determines if there is a need for fuel rail spacers or injector spacers when using a LS2/LS3 OEM fuel rail.
below is true when using OEM injectors, the ##lbs of the injector is up to you.
LS1 injectors need (qty 4) 1/2 inch fuel rail spacers
LS2 injectors dont need any spacers but need wiring harness adapters
LS3 injectors need (qty 8) 1/2inch injector spacers also need wiring harness adapters
I am running the LS2/LS3 fuel rail and FIC LS2 42lbs injectors with wiring harness adapters, in this case its a bolt on and go fuel system no spacers needed.
The injectors length determines if there is a need for fuel rail spacers or injector spacers when using a LS2/LS3 OEM fuel rail.
below is true when using OEM injectors, the ##lbs of the injector is up to you.
LS1 injectors need (qty 4) 1/2 inch fuel rail spacers
LS2 injectors dont need any spacers but need wiring harness adapters
LS3 injectors need (qty 8) 1/2inch injector spacers also need wiring harness adapters
Last edited by camcamaro1991; 03-05-2010 at 07:36 PM.
03-05-2010, 07:44 PM
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When you say adjust the mount, do you mean the location front to back or just the height to get the rail spaced properly from the intake to accomodate the injector height? The mounts are just billet blocks. It'd be real easy to make new mounts that were the correct height. Just need a piece of billet and go to town.
03-05-2010, 07:51 PM
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height to get the rail spaced properly from the intake to accomodate the injector height<--- thats it you nailed it.
i attached the FAST LSXr Fuel Option Flow CHART
it states to use a OEM fuel rail or billet rails and other related information
i attached the FAST LSXr Fuel Option Flow CHART
it states to use a OEM fuel rail or billet rails and other related information
Last edited by camcamaro1991; 03-05-2010 at 07:59 PM.
