turbo charging 5.3 in 05 silverado??

[maggs6288]

I am in the process of Turbo charging my 5.3 in my 05 silverado. I've read a lot on this site and everybody is very helpful and just hoping for some advice. Thanks in advance. I have a fresh built 5.3 with a comp cam .560? Lift (not 100% sure on that off hand) I put comp can beehive gold springs in as well. I'm going to be installing a 70mm rajay Turbo. It will be front mounted. No intercooler. It will have the snow methanol injection kit stage 1. I'm also going with dual 75 shots of nitrous for off line launches. I need to run a return fuel system and 255 lph fuel pump with at least 60# fuel injectors. What's a company that makes a return fuel rail for my motor or do I have any other options? Other upgrades are a built 4l65e transmission with monster SS internals Corvette servos and all aluminum actuators. Running a 2800 stall converter built by monster transmissions. Any help on my fuel system issues would be a great help thanks again.

[TurboMic]

Dont need new rails for the return, just need a regulator and plumb it in, but with an 05 you dont have to do a return style reg. For a 255 pump. Just put it in and go. You building your own torbo kit? good luck on the build

[maggs6288]

Yeah I'm building it all myself. More work then I had thought. I talked to a Guy at TRE performance and he said I cant go with the walbro 255 pump because it can't take multi voltage like the OEM pump design? Does that sound rite? This is all kinda new to me.

[WARLOCK]

Many members use that fuel pump with no problems.

[TurboMic]

Ya, its a very common pump. You will have no issue with a 255. What are your hp goals? And what the point of dual 75 shots of n2o?

[maggs6288]

Thanks guys ill go with the walbro pump. I would like to eventually get up near 800hp. I don't know if its possible with the 5.3 but I do have a 6.0 that I'm gonna build to take the abuse a little better. This motor is kinda a trial engine I guess. I wanted to go with an overall 150shot but I didn't want to put 150 to the motor all at once. I wanted the n2o to get the truck off the line and then another shot mid range of 2nd gear. Does anyone know good injectors that are a direct fit for my truck in the range of 60# maybe a little bigger? One more question if anyone knows. Should I switch to a speed density sensor instead of a maf sensor?

[micah8719]

Technically, you'd need 80# injectors to reach 800 hp according to the equation I came across when sizing the injectors for my build.

(BSFC * EstHP) / (NumCyl * IDC) = Injector Size (in lb/hr)

BSFC = Brake Specific Fuel Consumption (0.65 for MOST turbo applications)
EstHP = Horsepower range you're shooting for (800 in your case)
NumCyl = Number of Cylinders (8 in your case)
IDC = Injector Duty Cycle (0.80 or 80% as rated from factory)

So (0.65 * 800) / (8 * 0.80) = (520) / (6.4) = 81.25

Another useful, but maybe somewhat inaccurate estimate for calculating how much boost to make 'x' amount of horsepower is this:

(CurHP / 14.7 * Boost) + CurHP = NewHP (Flywheel)
So (300 / 14.7 * 10psi) + 300 = 504 HP

[TurboMic]

well man, 800hp is up there. not impossible, but what your describing (in most cases) will only be around a 500 hp range setup IMO. one 255 will not support much more, and running a non intercooled kit will be a limit for you as well. im pretty sure 42# injectors are the biggest direct fit. Boost is not cheap, and short cuts only cause bigger problems down the road.

[maggs6288]

That's what I thought. But wouldn't I have to go with a dual fuel pump setup then? I'm gonna do more to my next motor/Turbo combo with the 6.0. Like I said I'm really new to all this so I'm using what I have for my trial setup. In the near future ill have a lot more questions regarding the other motor. Thanks for all the help.

[maggs6288]

Thanks turbomic will keep that in mind. The bigger injectors are a bit taller rite? I'd just have to raise up the fuel rail?