And it actually helps to have a slightly restrictive(not the best word) exhaust before the turbine. Keeps velosity up and helps with spool time due to the pressure difference before and after the turbine wheel.

 

I realize that... but I think its exactly why at lower boost levels a supercharger could be more efficient. Superchargers struggle to create the boost that a turbo can, and they often cost a lot of power to create it, but at moderate boost I think the benefit of moving more air outweighs the inefficiencies of a supercharger being belt driven.

I'd be really curious to see just how much more air a TVS is pushing on a 6.0 at say 8# at 5k RPM compared to a similar turbo with stock manifold/log exhaust at the same boost level. I'm talking with the same heads, and a cam that is correctly "spec'd" for both. I know this is not because a TVS is 'better' at pushing 8# of boost, but its because so much more exhaust can escape that 8# of boost can really mean 2 totally different things there... outside of probably total air in the cylinder when it fires.

Basically what I'm getting at is I think I'm realizing for a low boost aplication, like my LQ9, a supercharger might be a far superior answer to create great power using FI...

I'm sure there is something I'm missing about a turbo set up that will even everything out here... and I really want to understand this. I think the bottom line is I may not have enough of an understanding of what makes a turbo set up great while I am much more familiar with a blower. Everythign I typed makes sense in my head, but I'd love to be proven wrong lol.

 

I'll add this to the mix. I don't know who this is... but I have a feeling they are a member here.

Those are real impressive numbers on 10# in a cam only 5.3. Add a little displacement for a 6.0 and a 76mm turbo and that looks like a 600 RWHP dyno at only 10#. Pretty awesome.

 

397.81 RW/HP 446 RW/TQ SAE Corrected.

LQ9, LS6 Cam, Mid Length Headers, Cats, Radix MP112, 3.4 Pulley, 42lb Injectors, Walbro 255lph in tank, EFI Live base tune (Black Bear).


Hope to do a little better once I send back data logs plus I swapped out the crappy flowmaster 40 as well as some more mods to come.

 

The flow 40 is probably hurting more than you think.

How much boost does that pulley get you? It can't be much.

 

That's Carbongmc, a member on here. The 5.3 melted a piston a few months back and a new build is in the process!

 

I use two stock 6.0 manifolds on my camaro and make over 1500 rear wheel hp. so dont worry about the manifold being the restriction. turbos dont dyno good, they have to spool and the numbers will always be off because its a short pull,

 

4.8
Patrick g cam (spec'd for procharger), comp cam single valvsprings, stock heads, stock intake, stock tb, stock head bolts, stock mains and rod bolts.

Pt 88 turbo 16 psi/20psi second pull
Snow Performance methanol
No NOS (hate it)
4l80 w/4400 circle D verter with circle D flexplate.
Dynoed on 20's 295/40's

Recently chipped piston #3 due to the stupid vacuum line melted from waste gate.
On a Loaded dyno:
671rwhp/622rwtq @16 psi..........792rwhp/680rwtq @ 20 psi......

16 psi pull

20 Psi pull

 

Thing sounds like a damn jet takin off!!! Bad *** numbers too!

 

Bet its laggy as **** on that 4.8! But dam its like the space shuttle when it lights off LOL... Awesome