I was recommended to run the MSD 50# injectors because I am planning on a supercharger set up @ about 7-8psi. I agree also that overkill is good in some areas too but this is new to me. If I run 50#ers and only run up to say 7-8 psi is their any long term ill effects that might come up. Also by going to the larger injectors what in-line fuel pressure do I need to expect to run. I had also learned that some of the aftermarket harness makers ( for LS-1 swaps ) do come with the diagnostic port so I will be able to run the LS-1 edit program! yeeeeeeeaaaaaaaaah!

Tony....

 

First, i believe the MSD injectors are high impedance which is good. When you go any larger than that, you run into low-Z injectors which are not directly compatable with the PCM.

Second, those are most likely rated at 3 BAR (~43 psi) If you plan to run them at the stock base pressure of 4 BAR, they will be even bigger.

Third, are you planning to run a rising rate regulator or an FMU??

You will need programming w/ those injectors, so i suggest staying away from an FMU and do it the right way w/ a 1:1 regulator.

I've not had any experience w/ those injectors, so i don't know how they are at short pulse widths. Idle/part throttle may suffer if they are not fine enough at small pulse widths.

7-8 psi is good and fine, but you desired power level will drive your pump selection. How much are you after? Those injectors will probably be plenty over kill <img src="gr_stretch.gif" border="0">

 

I would like to be reliably in the 500 range give or take a few. I am trying to be realistic anything more than 500 and the chassis it will be in would not be able to handle it. I am open to any and all suggestions.

Tony...

 

Hi Tony

Go ahead with 42# injectors. They'll be plenty for 500rwhp and give you a little room to grow in the future. <img src="gr_stretch.gif" border="0"> I've heard the Lucas injectors are nice.

Johnnie

 

XL.......
What would the 42's be good up to...... you know how it goes, You start out for 500 and you end up at 600 he he he hehe he

Tony....

 

I run the SVO 42's now

base pressure of 4 BAR (~58 psi)

~10 psi made 570 RWHP

I push the injectors to 95%+ on 12 psi. They will get you close to 600 RWHP w/ a 6 speed.

I run out of pump before injector w/ the current setup.

 

Harlan, I can't figure out how you keep that beast in a straight line. With Nitto Extreme Drags on my car @7psi, I go about 1/3 throttle and the car is all over the place in 2nd gear! <img src="gr_stretch.gif" border="0"> <img src="gr_stretch.gif" border="0">

- Dug

 

1st, 2nd, most of 3rd <img src="gr_stretch.gif" border="0">

it's all about the controlled slide <img src="graemlins/gr_devil.gif" border="0" alt="[devil]" />

 

Where can I get a set of #50 injectors. Iam also planning on supercharging and adding heads and cam to complement the package. I should be in the 575-600 range with 7-8 pounds of boost.

 

50# injectors won't matter much if you don't modify the stock fuel rail or the rest of the fuel system. Keep that in mind.

 

I have the 98 C5. According to some of my research the 98 vettes are equiped with a better fuel rail system than the newer cars. Iam just not sure if I need to update my fuel pump?