compound turbo ideas
 

i need more air on my truck but im not rich lol.... iv heard of compuonding the stock with a S400. has anyone tried it or have some thots on it?

Yep lots of people have done it and it works good.

Here is a pretty informative thread about the setup Ryan did.
https://www.dieselbombers.com/5-9l-2...urbos-2-a.html

thanx man. im gona try it before i spend 4k on a kit. do you have any idea what kind of boost i will get?

Id think 55 to 60 would be a good range

thats whati was looking for. got to do head studs too. is that a hard task? no timing bull or any of that is there?

Nope no timing cuz we are electronic controlled. And for head studs they are just time consuming to do. You just need to follow the torque sequence and do one at a time and do several torques on them and a hot torgue as well

cool. i work in a machine shop so i can handle that. thanx for the info man. im gona go buy me some more air:tu:

Hell Yeah:c:

What are you running for fuel?? hx35/s475 should be good to 550-600hp. maybe a little more. 35/472 will be a little less and offer quicker spool up. should be able to get the s475 and piping for around $1900. Studs will be another $400. Depending on your fueling you'll see anywhere from 55-75psi of boost. I'd also be thinking about oringing the head and getting 110# valve springs. Just remember you need to tune twins after you install them!!:c:

iv got a offroad vp-44 thats 275hp and a superchip(i know iknow) the super chip suck but i get so much fuel right now that its blacking out car behind me. i realy dont have the money to do orings.
what do you mean by tuning twins?

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also im gona run them sequential. is it ok to use my stock intercooler for the first on and a custom one for the big turbo and y them together after the coolers?

Your better off (cheaper) to compound them. Then run them both through the stock intercooler. You could buy it all for under $2300. Thats top and bottom turbo with all the piping out the door!! And that Would be enough air for well over 600hp. Put the bd twins to shame!! except bd's 750 and 850 kits.. lol I'm not excactly sure what an offroad vp pump is?? you mean like a hotrod pump?? If you still got stock injectors then don't even think about twins. Thats no where near enough fuel for twins.:c:

im putting 150 or 200 hp injectors in it first. so the stock intercooler could handel both turbos ok? the off road pump is for a semi. its bigger than a hot rod or the dragonfly pumps the hotest pump you can find from a performance shop is 260hp and mine is 275. runs alot of fuel.

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what do you mean by tuning twins?

Hmm never heard of the pump... owell.. 150's are the smallest i'd go for twins unless I was doing something like an hx35 over an hx55. Then the most I would go with would be 150's. 200's will be enough to spool twins efficiently. Your stock intercooler will be fine as long as you don't run a ton of boost. like over 70lbs. You'll need a weekend to install the twins injectors and head studs and then another week or two to play with them and tune them in. Twins aren't just a bolt in thing. If twins are not tuned properly they can be very laggy and work against eachother.

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You have to adjust both wastegates to tune them. usually you set the top turbo to half of the total boost you want.

ok that makes sense. im gona go with the s400 i think. im lookin for 600hp. i looked at the s475 and thats a huge turbo lol. do you think studs alone will be ok without orings? think i can get 55 to 70 pound of boost out of that?

The s400 is just the model of the turbo. Kinda like an s300. Then they make s357, 362, 364, 366, etc..... the 475 will be a good match for that hx35 and it will still give you room to grow if in the future you'd want more. The limiting factor in an hx35 over an s475 is the hx35. But you will be close to 600hp worth of air....and you'll defanately be seeing 55-60 psi with twins. Just remember with excessive boost your going to start needing supporting mods like valve springs and possibly orings. I would do studs at first and if/when you blow your head gasket do orings then!!

how does that work with the second turbo? do you nees a waste gate that can handle 70 psi or just no waste gate on the second one?

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ok il just run the s475 then and oring it when it blows lol. do i need a wastegate on my big turbo? one that can handle 70 psi or just no wastegate?

I don't believe you will need one. If your two worried about it then run an egate in the hot pipe or run bov's in the cold pipe. That'll keep your psi down to a lower level. I know a guy running an he351 over a ht3b and he keeps drive pressure down with 2 55psi bov's in his cold pipe. Running those two turbos with ddp200's and no studs..... but he is also running an HO pump so its prob only around 500hp.

only around 500?

Yes a ho pump is only good for about 500hp.. maybe a little more. An so pump is good to about 650hp. After that you need a monster pump or something along those lines.

Hmm im building over 500 with a HO pump and a single turbo

well I believe your a little high on your hp estimates running a stock hx35 for the top. my compounds are 62/71/14 over the s475 with 1.35 housing with ddp 200's it was 575 ddp 250's 601 and with lightning 3's is made 683. the so pump is a good pump and they last been abusing mine for 3 years now but with 20psi steady to it and 0 issues.

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yeah but your pretty much maxing it out they will make more than 500 but not a whole lot more. have seen a truck gain 50hp just by doing a so swap being only change same day

Yeah your prolly right but I cant wait to see what it does with the twins on it

just what I have seen myself is what I am basing my info on.

Uncorrected?? Do you have a dyno sheet also.. Not saying it can't happen. Its just farely rare

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You probably wont see much of a gain over running your single... If you swapped to an so pump you'd have alot more room to grow.

01Quadcab- I think I'm a little over the hx35's limit... it'd be more like 500-550hp. An I never said anything bad about the so pump.... I actually said they were better than the ho. I personally would never run anything but an so... Unless I did a ppump! :choochoo:

I bet he will. To make power you need fuel and AIR. If you have enough fuel, add more air. I noticed a good bit of extra jam out of my rig when I put COMPOUNDS on it.

what is the difference between the ho and so pump? never heard that.

https://www.dieselbombers.com/5-9l-2...o-vp44-ho.html
:tu:

i didnt think the vp had plungers. i have a performance pump in my truck. does that mean its a bigger one.

I'm not too sure what has been done to your pump. Cams, Rings, and plungers can be modified to push more fuel. Exactly what is done, I am not sure.

the vp-44 is a rotery type pump. i dont think it has a cam and plunggers. iv rebuilt one myself. the old ppumps were built that way but i dont think the vp is.

Yes that is true... But that ho pump is going to limit the FUEL his truck gets... For instance, if I have a vp that tops out at say 525hp, I have a set of 200hp injectors and a super b special. 200hp injectors will put out over 525hp, but I wouldn't have enough fuel from the vp to feed the 200's. Regardless if you put twins on it or not, There would be no need for AIR if you don't have a better supply of FUEL. Yes he will notice quicker spool up and he wont loose as much boost between shifts so it will be a better use of the fuel he has, but as for top hp gains he wont see much. And I believe the Vp does have a plunger, heard you can break it by lifting off the go pedal in a wot run. Not 100% sure on that though. And It does have a cam in it, monster mike reginds the cam in his pumps to add fuel..... Also gives the truck a killer lope!! haha

They still have a cam ring, it's what the plungers follow. They don't have a inline cam, pushing plungers up.
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:humm: lol

??? Ok... we'll see. I'd like to see the dyno sheets of him making over 500hp now, and the dyno sheets of him making WAY over 500hp with twins. Theres just not enough fuel to compensate for the air. Both these trucks below have 200hp injectors twins and Steve was the only one to break 500hp. Read the comments on the video aswell