Different kind of twins

Samdweezel05

Samdweezel05

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Jul 21, 2008
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All of the kits and trucks I see have compounded twin setups. Why not have one turbo on each manafold? Is there a problem with having only 4 cylinders pushing each turbo? If they were sized correctly what could the problem be? I am thinking two of the same sized turbo, not two different sizes. I am sure this has been tried and probabaly didn't work but I have never heard anything about it.

Phil
 
whitetrash21

whitetrash21

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Apr 29, 2008
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It's a lot harder to size the turbo, especially for a big hp truck when they're run in parrallel. Too big and you'll never get it to spool, especially with only 4 cylinders pushing it. Too small and the turbo will be out of it's efficiency range before the motor is. A lot of this is due to the fact that a diesel truck's rpm range is only 60% of that of a gasser. That's why its easier to compund them, small turbo assists the big turbo. I think the Sidewinder is using nitrous to help spool their turbos too.....
 
Samdweezel05

Samdweezel05

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whitetrash21 said:
It's a lot harder to size the turbo, especially for a big hp truck when they're run in parrallel. Too big and you'll never get it to spool, especially with only 4 cylinders pushing it. Too small and the turbo will be out of it's efficiency range before the motor is. A lot of this is due to the fact that a diesel truck's rpm range is only 60% of that of a gasser. That's why its easier to compund them, small turbo assists the big turbo. I think the Sidewinder is using nitrous to help spool their turbos too.....
Click to expand...

This is exactly what I was thinking.

Phil
 
1lowdiesel

1lowdiesel

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Sep 18, 2008
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or you can just run the banks manifold and rig up the plumbing.

42733.jpg
 
1lowdiesel

1lowdiesel

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Sep 18, 2008
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yea i know, but this would be the easiest was to run them parrallel into the motor i'm saying. wonder if you coudl swap the manifold left to right to have the outlets come out forward, just thinking out loud lol.
 
05smoker

05smoker

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Mar 30, 2007
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We are going to flip manifolds on our puller instead of making smaller header logs. You can flip to opposite sides, but not the same side (we were trying to run two passenger side manifolds but the bolt holes are all staggered.)
 
McRat

McRat

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Aug 2, 2006
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The problem is not that we cannot get VOLUME of air (parallel twins are #1 in volume delivered), it's PRESSURE we want. None of available chargers will go past 60psi as a single, and all start to run off their maps much earlier than that.

So compound twins are the key to more high pressure air.
 
duratothemax

duratothemax

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Aug 28, 2006
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1lowdiesel said:
wonder if you coudl swap the manifold left to right to have the outlets come out forward, just thinking out loud lol.
Click to expand...

thats what I was saying. The duramax heads are the same left and right (freeze plug locations are different tho) just like any other chevy V8 (or 4.3 V6)
 
05smoker

05smoker

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Noreaster said:
Ya used to like watching Parish going faster & faster, but haven't seen the truck do anything lately. Heres the link to his gallery of pics when he built the twins. http://www.neufamily.org/images/turboworkgallery/
Click to expand...

I heard he sold the truck. Any truth to that?

I loved the videos from years back when they snookered unsuspecting soles into a street race with a 10 sec truck.:rofl:
 
03 D-max

03 D-max

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what about 4 turbos to sets of smaller compounds :pant: it works out in my head lol

AND IN CASE BRAYDEN IS LOOKING YOU HAVE A PM :)
 
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