L83 HPFP and Injector Limits

[imiller1974]

Do any of you guys/gals know the limits of the stock L83 high pressure fuel pump and injectors?

 

Current mods; 

I have stock exhaust manifolds, stock Y-pipe, an SLP 3" cat back, an SLP TVS1900 supercharger, 6.2 throttle body, huge AEM Filter, and pullied to make 10psi. It's BlackBear tuned as well, AFM turned off. Runs well, just want a little more. 

 

Future mods;

3.73 gears. I'd like to go with 1 7/8" long tubes, 3 to 3 1/2" Y-pipe, and 3 1/2" cat back, with some extra resonators, maybe port the blower snout a bit. I'd like to find the smallest aftermarket cam, with a 30+% fuel lobe, and dump the AFM lifters, run valve springs as well. I plan on getting a local tuner (Charlotte, NC) to do some dyno tuning, but more importantly, drivability tuning. Not looking for max power...

 

I'm concerned about the stock L83 injectors and HPFP. The LT4 injectors and HPFP are a bit pricey, but I haven't shopped around too much, just browsed. I can replace the in-tank fuel pump fairly easily and "fairly" cheaply. I can remove the bed with my tractor. 

[flyingfool]

I would upgrade to the LSA LT motor injectors , not sure the specs between the two, please tell us if you find out.  BTR cams has more experience in the intake fuel system call them for real data these forums can be dangerous for finding factual knowlege!

[Jaychevy81]

I have the TVS 1900 if I was gonna go further I would do in tank low side and LT4 injectors first. See where that takes you that High side pump ain’t cheap lol.


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[imiller1974]

Looks like the LT4 pump is a little under $800, the LT4 injectors are a little under $600...  That's not too bad.

[Jaychevy81]

No not to bad it all depends on how much your gonna gain. I know that HP pump maxes out depending on how far you wanna take it. Like doing a cam and what not.


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[CamGTP]

On my 5.3 with 70-80% ethanol content I was pushing my injector pulse width right to about 6.0ms and from everything I've read going over 6.0ms is about where the limit is. On pump gas obviously my duty cycle is way down because it doesn't need the 20-30% more fuel flow.