S400s over stock ?s

[motoking_1990]

I will be doing a twin setup in the future and there are some things I dont know about it. Trying to see what I will be getting into and how its done.

Do they use factory style ic pipes? Or do they use a different style? Also how is exhaust routed? I have never seen one in person.

Also how do you change everything to v-band style? These hose clamps blow off too easy imo.
Thanks,
Greg

 

[TwiztedMetal]

Most kits I have seen will have new y bridge and cold side IC piping. If you want all v band on the piping I'm pretty sure they will have to custom make a kit for you. You would have to get ahold of hsp, sdp, or any other place that makes 400 over stock kit.

 

[dirtydmax]

Are you building it yourself?With my 475 over stock i hit 60lbs and didn't blow the factory ic pipes or silicone.Maybe got lucky but they are tuff.

 

[joe@HSPDIESEL]

All of our kits do include a new one piece y-bridge and cold side. Everything is v-banded except for the bridge to cold side on our standard kits. On the S475 over stock it hasn't been an issue, but on the larger setups we v-band that connection as well. :thumb:

 

[motoking_1990]

What about the hot side? Does it use the factory pipe I take it being the ihi uses hose clamps? I blew a hole in the rubber boot on the oulet of the compressor side once. Couple years down the road I may ditch the stock and run something different.

 

[TwiztedMetal]

What about the hot side? Does it use the factory pipe I take it being the ihi uses hose clamps? I blew a hole in the rubber boot on the oulet of the compressor side once. Couple years down the road I may ditch the stock and run something different.

Don't you already have the MBRP IC piping? I would just use that on your hotside

 

[Awenta]

Joe, how does the 484 over stock behave? Or p/p ihi?

Sorry for the hijack!

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[CapitalD]

vbands are great but require skill to make perfectly matched connections on both ends. ive never had issues with silicone boots as long as they are straight. If you are going to be making the piping yourself curve the piping so that you only need straight silicone boots. Ive had good results doing this even at 70psi.

 

[motoking_1990]

vbands are great but require skill to make perfectly matched connections on both ends. ive never had issues with silicone boots as long as they are straight. If you are going to be making the piping yourself curve the piping so that you only need straight silicone boots. Ive had good results doing this even at 70psi.

What do you mean perfectly connections?

No worries Awenta. Thats why I started this thread to learn about twins.

I have the mbrp hot pipe because I blew a hole in the rubber and had a hole almost ate through the aluminum.

How is exhause ran with twins? Does it have a separate downpipe that y's in somewhere with a feed of some sort?

Sorry for all the questions im just trying to learn.

Thanks,
Greg

 

[CapitalD]

Sorry for being unclear, I mean the connecting point s of the piping have to match up perfectly. If you have a v-band on both sides of the pipe, they have to be dead on or they won't seal right. unless you have a bellow or a flex joint which gives you some wiggle room. Silicone boots give you a little more play, but as you probably guessed, they are not as strong. I only run straight sections, and when I do, both pipes that I am connecting are almost completely butted up to each other.

And the exhaust is routed from the secondary's exhaust housing (valley turbo) to the primary (the larger of the two), it's the opposite on the compressor side (big turbo to small) if you are run a compound configuration. some people like banks run true twin turbos in parallel but that's another story.

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[motoking_1990]

So there is still one downpipe? It just comes off the atmospheric turbo and out to the exhaust. Pretty much deleting the factory downpipe?

How does this work? (A larger turbo feeding a small) It seems like that would overspool the smaller turbo.

It would make more sense to me that the smaller would help the bigger turbo spool up faster.

 

[CapitalD]

So there is still one downpipe? It just comes off the atmospheric turbo and out to the exhaust. Pretty much deleting the factory downpipe?

How does this work? (A larger turbo feeding a small) It seems like that would overspool the smaller turbo.

It would make more sense to me that the smaller would help the bigger turbo spool up faster.

Since I'm new to this forum and have a low post count, I'll just continue with this topic and help explain what most people on here probably already know.

Yes, only one downpipe.

I will try to break it down leaving out some of the technical details. It works like this, the primary turbo is the first to take in air (the big one). This is the low pressure high volume flowing turbo. No matter what, the maximum flow numbers of your setup will be driven my this charger. This turbo then feeds the secondary charger (remember were talking about the cold side not the hotside). The secondary essentially recompresses the air from the primary into a smaller denser package. The denser the air, the higher the oxygen content per measurement of volume which leads to the ability to burn more fuel. So in other words your looking for high pressure cold air which is kind of hard to do since naturally the more pressure you make, the hotter the air becomes which is why an Intercooler is used. Moving on.

Now talking about turbos feeding each other, it all has to to do with pressure differential. With one turbo, the turbo has to work pretty hard to increase pressure from atmospheric pressure to say 50psi, but with two turbos they split the work and it's easier on them. Also, You cannot have the small turbo feed the big turbo because it would create a bottle neck when the big turbo lit. It would be like having a very big turbo with a small inlet.


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[danzick]

factory down pipe is removed and replaced with the "hot pipe". it goes from the exhaust on the stock to the exhaust on the s400.

 

[motoking_1990]

This makes sense now. Thanks for the help. How does the cold pipe fit between the atmo and the engine to the y bridge? Also the air box is deleted as well correct?

 

[CapitalD]

This makes sense now. Thanks for the help. How does the cold pipe fit between the atmo and the engine to the y bridge? Also the air box is deleted as well correct?

I don't really get your question...."how does the cold pipe fit between the Atmo and the engine to the y bridge"

It sounds like your maybe confused about the path of air.? Some of these pipes I kind of made up names for so other people might call them something else.

Atmospheric air --> filter --> primary charger (atmospheric charger) --> interstage pipe --> secondary charger --> intercooler pipe --> intercooler --> post Intercooler pipe --> Y-bridge --> engine

Or maybe your question is literally "how does it fit"
And I'm pretty sure in most cases people delete or relocate their air boxes and passenger side battery and put the primary in that area.


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[motoking_1990]

you call it a post intercooler pipe. I call it cold side ic pipe. it would have to come up under the atmospheric charger to the y bridge.

I understand the air flow. I just didnt understand the exhaust mainly along with the vband clamps.

 

[NinjaMax]

its the best I can do with a mouse lol, hope this helps

 

[CapitalD]

^thats a good pic for the cold side

I'll try to dig one up that shows more of the exhaust for you to see. Here.



See how the stock turbo's exhaust feeds into the primary's turbine where the passenger battery traditionally goes, then it's just straight out the exhaust system from there




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[baggedLB7]

A few pics in this thread also.
http://www.duramaxdiesels.com/forum/showthread.php?t=35052

 

[CaptPhil]

^thats a good pic for the cold side

I'll try to dig one up that shows more of the exhaust for you to see. Here.



See how the stock turbo's exhaust feeds into the primary's turbine where the passenger battery traditionally goes, then it's just straight out the exhaust system from there

Thats a whole lotta pie cuts. Looks like very nice work.

You know they sell bends right.... j/k man :hug: