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Old 04-05-2010, 08:36 PM   #1
BUCK2
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Waste Gate ???

I completely understand how a waste gate works on a single Turbo.

Here's is where I get confused on a twin set up, the top turbo is waste gated and feeds the bottom turbo, so does the gated gases help to spool the bottom turbo or is there not enough volume there?

Also if you have the top one gated to 30 or even 40 what will the actual PSI be thru the engine since you are also running it thru 2 now?

Do these questions make sense?

I am trying to get a better understanding of how it works.

Thanks
Steve
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Old 04-06-2010, 01:53 AM   #2
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This can get complicated, so the first thing you want the secondary (top) turbo to do half of the work and the primary (bottom) to do the other half when you are at what you want for full boost. Now what you have for a top turbo could restrict the exhaust flow so you will want 3 gauges, one for each of the following boost from the primary, total boost, and drive pressure gauge. Do you want to know more, if so what?
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Old 04-06-2010, 08:52 PM   #3
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Hey Later,
I think I understand how each turbo should compliment the other. Althought I need to determine what I should be at boost level wise; Is that what you are saying?
So if I want the truck to only make say 50lbs of boost total combined between the two turbos I should limit the boost by the amount of fuel or thru the waste gate of the secondary (top)?

Am I thinking about this right?

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Steve
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Old 04-06-2010, 09:13 PM   #4
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limit boost with wastegating and fuel. you can keep throwing fuel at it and wastegate it even more to keep boost where you want it. you could also pulll some fuel to limit boost and power at that given boost level.

Garrett
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Old 04-06-2010, 11:24 PM   #5
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I keep going back to not looking at psi of boost but more what is the volume. Lets say you put a HX35 over a S475 well if you did not drill the partion in the HX35 and enlarge the internal wastegate your drive pressures will skyrocket. So you will need a drive pressure gauge to know when it is time to back off and save the head gasket.

I am going to assume you will wastegate the secondary to the primary thru the hot pipe. Well to keep the primary from building more pressure you will need a wastegate for it too.

The size of your turbos will depend on what power level you wish to achive.

Also Garrett has a point about not overfueling.

Last edited by later; 04-06-2010 at 11:27 PM.
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Old 04-07-2010, 12:22 AM   #6
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The Size of the Turbos is a 57/65/14 over a S475 1.32A/R. The secondary (top) will be waste gated thru the hot pipe to the S475.

This might be a silly question but why do so many aftermarket kits only waste gate the secondary thru thje hot pipe and not run a waste gate for the primary? For example BD's towing set, ATS towing set etc...

So how do you waste gate the primary? Use an external gate off the exhaust manifold?

As far as HP I do not have a number in mind, I just want to be able to set the truck up for towing better than what it currenlty is.

Here is what is going on now, My head is at the machine shop getting checked out and also I am getting it o-ringed as well(I blew the head gasket). I am also installing 60lb valve springs and I have studs on the way. So I am getting prepared to give it more fuel and install the twins.

I know I will need DV's to get more fuel to the motor, I am not sure I have enough fuel now for the twin set up. NOt sure my EGT's seem to stay in check it is hard for me to get it to 1300*.

I really appraciate the information I am just trying to get my head around all of this!!
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Old 04-07-2010, 03:08 AM   #7
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A B1 over a 475 should provide plenty of air I would try to keep the pressure below 60 psi.

The reason for not wastegating a primary is cost. You could add a wastegate to the hot pipe, but most people will just lift their foot instead.

A additional wastegate in the exhaust will only vent the secondary.

For injectors I would go with at least 5X14 you can use 5X16 to help shorten the injection cycle.

O-rings, studs, 60 lbs springs sound good, be sure to bottom tap the block and get all the cutting out. Have you cut the rocker arm pedistals yet?

If you are towing you may want to stay with the DV's you currently have. They will have a shorter cycle and help keep down the EGTs. You can allways change those later and if you want blow out the holders at the same time.

How much timing are you planning on?
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Old 04-07-2010, 04:51 AM   #8
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i like the idea of 5x.016s and a smaller DV.

also like mentioned above, the wastegating the primary is largely due to price. you dont often see it except for on higher end twin sets. tuning can also come into play.

Garrett
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Old 04-07-2010, 03:18 PM   #9
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The rockers are getting cut as well. Right now I am running 15* of timing and I plan on leaving it there for now.

So, if my secondary is set at 30 psi do i want to adjsut it to open at say 50 psi?
If it is set to 50 psi the waste gated gases will be going thru the hot pipe into the primary just at a slower rate of speed so it will stay in that 50 psi range then, right!!

As far as injectors I am running 90hp injectors, I will call them to see what the numbers equate too in actual size.
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Old 04-07-2010, 03:35 PM   #10
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I want to say 90's are something like 5x12 maybe?
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