Dual Turbo Questions

[TonOfDalt]

I have recently looked into dual turbo kits for LB7's and noticed a lot of them are running the Stock turbo as the secondary unit. My questions are these....
If the stock turbo goes "BOOM" fairly easily over 30 PSI then how can it support 40+PSI as a secondary? Is it just a matter of it will only support 30 PSI of pressure differance from inlet to outlet???
If this is the case then can you run another stock turbo as a dual set-up configuration or will the primary unit in the system essentialy "block up" the air stream towards the second stock unit? Reason I ask is because I would like to experiment with building my own set-up and stock turbos are cheap.
Thanks for any help guys!

 

[blk smoke lb7]

If you do decide to twin to the stocker,if it has alot of miles on it do yourself a favor and rebuild it before you do the twin kit.A little extra spent in the beginning will save you alot of problems down the road.This is JMO

 

[GeneralTJI]

Yes, it's the pressure differential the turbo see 's, not the total boost...(each adds to the total) you use the wastegate to keep the high pressure turbo (in this case the stock turbo) from overspeeding and exploding. There is a little more to it, but that's the basic idea. I'm not quite sure what your asking but two stock turbos in series wouldn't be beneficial... You might be able to run two stock turbos (in parrallel) that feed into 1 stock turbo... Sort of a low budget tripple turbo setup.... But this would be FAR from optimal for several reasons.... The sizing is mismatched for one ...

 

[TonOfDalt]

Yes, it's the pressure differential the turbo see 's, not the total boost...(each adds to the total) you use the wastegate to keep the high pressure turbo (in this case the stock turbo) from overspeeding and exploding. There is a little more to it, but that's the basic idea. I'm not quite sure what your asking but two stock turbos in series wouldn't be beneficial... You might be able to run two stock turbos (in parrallel) that feed into 1 stock turbo... Sort of a low budget tripple turbo setup.... But this would be FAR from optimal for several reasons.... The sizing is mismatched for one ...

Right on... All makes sense. I figured I was on the right track of thinking but wanted to make sure before spending any money. What kind of primary would you recomend then? I would like to stick to a dual set-up as a triple at this stage is far more complicated than I am wanting to play with.
Thank you again

 

[GeneralTJI]

Glad to help!

You have one major choice to make, go twins or go upgraded single with the option of twins later.

If you are bent on twins, use your stocker and put an S475 over the top of it. Good power, quick spool, good towing etc. Pretty affordable setup, pretty well rounded!

You can also look at upgrading your stocker to say, an S366. Simple setup that will make plenty of power, spool pretty fast (can tow with it) and leave room for twins and big big power later on.

There are of course other setups and options and turbo choices of course, but these are affordable, proven options...

It also depends on how much of the work you can do yourself etc. And what your primary use for the truck is etc.

 

[TonOfDalt]

Glad to help!

You have one major choice to make, go twins or go upgraded single with the option of twins later.

If you are bent on twins, use your stocker and put an S475 over the top of it. Good power, quick spool, good towing etc. Pretty affordable setup, pretty well rounded!

You can also look at upgrading your stocker to say, an S366. Simple setup that will make plenty of power, spool pretty fast (can tow with it) and leave room for twins and big big power later on.

There are of course other setups and options and turbo choices of course, but these are affordable, proven options...

It also depends on how much of the work you can do yourself etc. And what your primary use for the truck is etc.

Thanks for the input... I am leaning towards going with twins as its not something everyone has and is definately a conversation starter. I do however like your suggestion of first upgrading to the S366 and then down the road doing twins.
Basically what I am looking for is my truck is a daily driver and I am currently building it to make about 550 HP with a DSP5, EFI Live, Turbo back exhaust, intake air box mod, and Air Dog II lift pump/LBZ CP3. The truck has about 240,000 on it so i am trying to be easy on it for now while I am saving for a either a billet bottom end with a LLY Head swap or swapping in a LBZ. Once I am to that point is when I will be doing a turbo system upgrade. At that point I would like to see 700-800 HP and be as streetable as possible as I will also be towing with this set-up.