This is all going in my 2000 RCSB AWD Silverado. My truck weighs 5000 lbs.

First, the 4L80E (HD2 shift kit) is swapped in with a SC3000 Yank converter, mated to a NP149 transfercase. It'll have a trutrac installed in the rear. 3.73 gear ratio.

Im planning on swapping in a 2005 LQ4 with 113k on it. I'll be using my stock intake and throttle body from my 5.3L (DBC). I have a factory return fuel line.

Z06 camshaft
204/218 int/exh @ 0.05" duration
0.551" / 0.547" int/exh lift
117.5 LSA

Z06 valve springs
Hardened pushrods
LS2 timing chain
LS7 lifters
LS6 ported oil pump
LS9 head gaskets
eBay head studs
Areomotive 340 fuel pump

Turbonetics ceramic ball bearing 76mm turbo,HP76mm compressor with a F1-68mm turbine and .81 A/R

I think this is it.
http://turboneticsinc.com/store/inde...product_id=564

3.5" downpipe
KB racing turbo manifold
JGS 40mm waste gate
Intercooler that fits between the frame rails, with 3" charge pipes
Tial 50mm BOV

60# injectors
http://fuelinjectorconnection.com/sh...p?productid=25

Now, all that being said, this is my collection of parts. I've been collecting for over 2 years. Originally, I was going to boost my 5.3L. Now, with the LQ4, I'm thinking my turbo is too small.

I'm also considering porting my 317's.

Thoughts? Opinions?

 

Depending on your goals it seems to be a good plan. A friend of mine had a similar setup in his ecsb truck and it was fun to say the least. Would prefer a .96 exhaust housing but use what you got till you upgrade.....

 

TC76 is too small. S475 or something around that size. If you have room in the budget get better valve springs, and a better cam. But definitely better springs. Also more fuel pump, do 044 in-line with the 340. Get the 80lb injectors as well, eventually you will turn it up and you want the fuel system to do so.

 

Sweet. Thank you.

Really? S475 seems huge! Remember, this is a fun driver, not a race truck. My wife still needs to be able to drive it.

Won't an inline fuel pump be really obnoxious?

 

At least at PT7675, the TC76s' turbine wheel is too small for a 364" engine. They are loud, but over the turbo you shouldn't be able to hear it. If it makes you feel better you could do dual 255s in tank or something.

 

PAC-1218 springs would be much better. Cheap too...

 

Here's what I found.

PAC-1218

O.D. 1.290
I.D. .885
Seat Load 130@1.800
Open Load 318@1.200
Coil Bind 1.140
Rate (Lbs/In) 313
Maximum Lift .600 in.

GM Yellow springs
12586484

O.D. 1.290
I.D..885
Seat Load 90 @ 1.800
Open Load 295 @ 1.250
Coil Bind 1.085
Rate (Lbs/In) 375
Maximum Lift .570 in.

 

I believe u want the higher seat load to help keep the valves closed in boost the 1218 is also rated to a .600 lift.

 

Updated the info.

If/when I do a cam swap, I'll get different springs.

Hmm, what cam and springs would you guys go with? Remember, it's a 5000lb truck. Street. Streeeeeeet.

 

Isky Triple 12 would be a good choice.

 

Here is stock48's truck.

https://ls1tech.com/forums/forced-in...-size-4x4.html

 

That's insane. I just might have to look into the triple 12 cam.

 

Do better valvesprings and go ahead with that turbo for a while. Its not the best turbo for your setup but it certainly isnt gonna kill the setup. I agree with a .96 a/r being a better option. Down the road when you wanna mess with the setup throw a bigger turbo on and a new cam.

 

What's to be gained with the triple 12 cam over the Z06 cam? How much does the triple 12 cost and what springs are required? The PAC-1218? Maybe Comp 918?

 

That cam isn't radical at all and would be a good street cam. Maybe decide how much power u want first. then look at the cheapest way to get there. the cam will perform differently on different setups. IMO the $ per hp gained wouldn't be worth it on your setup. If you can afford to drop 500+ on 30hp thats another story. I'd just turn the boost up another pound.

 

I appreciate the feedback fellas.

So I should swap out my cam, turbo, valve springs, and pushrods. While I'm at it, why not L92 heads, intake, 90mm throttle body. If I'm going that far, why not an LS9? LOL.


I think for now, I'm going to port/polish my 317's and run it. LOL

 

For the cost you cant beat it, also since you are running a 6.0 a 4L80 with 3000 stall , and AWD and the truck is heavy its a no brainer. a S475 with the 1.32 A/R 96mm turbine will spool real quick, and can be had for under 700 shipped there is also plenty of space in the engine compartment to fit it with ease. Get a good electronic boost controller and turn it down to 6-7 psi for the wife and crank it up to your liking when you fill the need. Also as stated above get the 80 lb injectors are not much more and will support plenty of extra power later down the road when you get bored with 600 whp.

Also with AWD and the 4L80 you will have to have that T76 near full tilt to make your goal of 600whp. That will lead to back pressure well in excess of 3:1 on a 6.0. Foose04s posted results from his 4.8L when he had basically a identical turbo to the one you listed the results was a 3:1 ratio this was with a .96 A/R housing yours will be worse. a 6.0 will be closer to 4:1 since it is literally has to move 25 percent more exhaust another words if you run 15 psi of boost your exhaust pressure will be 45psi at least probably closer to 60psi this traps in heat in the cylinders and also leads to higher pressure in the cylinders when the intake valve opens which means you draw in less cooler air/fuel and its not as efficient at making power, not to mention closer to detonation due to higher temperatures. I would wager that the S475 will be at 600WHP around 15psi boost with the parasitic losses of your drive train it will have lower back pressure and lower IAT's as the compressor will be operating close to its most efficient area, back pressure will be between 1.1-1.3:1. Which translates into more fresh cool air/fuel and more wiggle room for timing and low Octane/ which makes the whole build safer and last longer, also gives you the ability to run a cam with some overlap if you want a choppy idle.

Your cam will work good and easily get you to your power goal that being said a cam from Martin at Tick will work better. You definitely need better springs. The 317s will work great for what you are trying to do. If your porting them your self then go for it. If your going to pay someone to port them take that money and get a cam from Tick instead, or save it and run a few more pounds boost. If have seen several untouched casting 317 and 243s rip off numbers in the 900-1XXXwhp area with a fresh valve job.

 

This is awesome advice! Thank you very much.

 

Just for grins, I asked Turbonitics what they recommended.

Here's their reply:

 

Told ya lol. .ake sure to keep is updated, check out Denmahs commonly bought turbo items thread, he has some PAC springs in there for cheap.