Parallel Turbos

[V-Ref]

Terminology drives me nuts too.....almost as much as IDEs.....I just wish Short Bus had some ACTUAL REAL WORLD EXPERIENCE with compounds....

http://powerstrokenation.com/forums/showpost.php?p=1277201&postcount=23

 

[neverkickn]

WTF is a parallel twin? At least get the nomenclature right.

Twins(parallel if you prefer) refer to two (2) equally sized turbos with one feeding each bank of a V block or half of the cylinders of an inline block.

Compounds refer to a large atmosphere turbo feeding a smaller high pressure turbo. You can call them primary and secondary if you prefer.

The terms "twin" and "compound" are not even a cousin to interchangeable.

Saying parallel twins is synonymous to Twain saying "suppose I am a politician. Then suppose I'm an idiot. But I repeat myself". ointlaugh:

Sorry to go off on you, but this kind of crap drives me nuts. Twin turbos and compound turbos are 100% completely different. :grouphug:

I'm sure many of my mistakes drive others nuts.

:biggun:

Is it me or did you turn into a ***in cock bag overnight. You used to be a pretty even keeled guy just kinda hanging around and having fun. Wtf happened man?

 

[09stroker]

WTF is a parallel twin? At least get the nomenclature right.

Twins(parallel if you prefer) refer to two (2) equally sized turbos with one feeding each bank of a V block or half of the cylinders of an inline block.

Compounds refer to a large atmosphere turbo feeding a smaller high pressure turbo. You can call them primary and secondary if you prefer.

The terms "twin" and "compound" are not even a cousin to interchangeable.

Saying parallel twins is synonymous to Twain saying "suppose I am a politician. Then suppose I'm an idiot. But I repeat myself". ointlaugh:

Sorry to go off on you, but this kind of crap drives me nuts. Twin turbos and compound turbos are 100% completely different. :grouphug:

I'm sure many of my mistakes drive others nuts.

:biggun:

Having over thought the situation, what are the control issues with twins on a 7.3? IPR, ICP, DC, BP, etc.

Wow take a chill pill....

What does the oil system have to do with "parallel twins"????

 

[neverkickn]

Another thing docbar, if you are going to quote Mark Twain, you might start with actually quoting him. You completely botched that one. As if the quote was even relevant to your point in the first place.

 

[vanderchevy18]

Dude. Doc. I know. I'm talking about an actual parallel setup. As in 1 turbo per head with a balance line between the intake plenums. As far as Luke goes, who gives a ****? They're twin turbos ran in parallel. Twin being identicle and parallel being seperate banks. Parallel twins.

 

[V-Ref]

Chris

I'm apologize for the previous derail! Kudos to you for doing

I think these 366s are way too big. I hope my math is wrong though.

How did you come about on those size of turbo?

Look forward to seeing how this project turns out!

 

[neverkickn]

Chris

I'm apologize for the previous derail! Kudos to you for doing

I think these 366s are way too big. I hope my math is wrong though.

How did you come about on those size of turbo?

Look forward to seeing how this project turns out!

This is a drag truck though so I bet it will run on the bottle.

 

[DocBar]

I said sorry for going off.... Geez.

Sorry again.

As far as control goes, I was wondering what the different feed backs from 2 seperate turbos would do to the IDM from the PCM. I guess I'm thinking too far into it or just in the wrong direction or just wrong.

My apologies to all and I'll post less when drinking from now on. That is all. Carry on.

Anyone got a smilie of :biggun: shooting :blah:? If not, make one and call it docbar. :lookaround:

:grouphug:

 

[Powerstroke Cowboy]

Dude. Doc. I know. I'm talking about an actual parallel setup. As in 1 turbo per head with a balance line between the intake plenums. As far as Luke goes, who gives a ****? They're twin turbos ran in parallel. Twin being identicle and parallel being seperate banks. Parallel twins.

Exactly!!

Chris

I'm apologize for the previous derail! Kudos to you for doing

I think these 366s are way too big. I hope my math is wrong though.

How did you come about on those size of turbo?

Look forward to seeing how this project turns out!

I personally think they will spool good. You can get a .83 A/R Exhaust
housing for them. Along with the 76/68 turbine wheel. You might even
be able to get a smaller A/R housing. Never checked for a lower one though.

tell me if I am wrong Chris, This set up will be in a dedicated race pickup. SO a higher stall converter can be used to help light the turbos. Not to mention that if it is kept in the 2500 to 4000 RPM range with 400/400 lighting should not be a problem at all!

Not to mention Matts sled pulling cam is designed to push the turbine harder and keep the turbos lit better. I am sure this would be a option to. That is kind of how i would do it.

 

[DocBar]

Dude. Doc. I know. I'm talking about an actual parallel setup. As in 1 turbo per head with a balance line between the intake plenums. As far as Luke goes, who gives a ****? They're twin turbos ran in parallel. Twin being identicle and parallel being seperate banks. Parallel twins.

What would be the advantage? For all of the work involved, couldn't you get roughly the same or better results from a properly sized single and even better from a compound set up? Would a twin compound set up do better? Is someone going to shoot me with a big gun for typing that? LOL

 

[vanderchevy18]

My billet s482 is supposed to flow 2200 cfm at 45 psi. An s366 is 1100 cfm at 35 psi. Right now I can light the 482 but with my 3250 rpm shift I choke out on the shifts until it spools again. It's killing my times. I could only do a 12.75 1/4mi with it. However, with some 4100 rpm shifts and a little giggle gas it should stay lit just fine. Ok so I'm spooling the 482. The s366 flows almost exactly half, so theoretically the flow through the turbine housing should be around half. Now you take that 1.15 utbine housing that I have on the s482 and trade it for a pair of .88 or divided .91 housings, and in my mind it works better than what I already have and with less drive pressure issues.

 

[vanderchevy18]

Yes. Dedicated race truck only. Not a street truck.

If I just wanted to do a compound, I would just use my 482 as an atmo and toss on a stock van turbo with a ww2 and waste gate the **** out of it. (No feedback on that one please. Don't like it? Go **** yourself. I would do it just to piss you people off because I would make it work and work well!) The problem is more rules than anything. My 78 F100 cab has a very shallow cowl. The firewall butts right up to the back of the engine. No room for traditional T4 piping. Modifying the firewall would put me in the super diesel class. I wouldn't be competitive. That's the number 1 reason I'm doing parallels. Number 2 is my Superduty headers don't fit. If I already have to buy and change them out for obs headers....... See where I'm going? Besides. I want something that is ****ing cool. Parallels do it for me.

 

[Powerstroke Cowboy]

If its dedicated to racing then yes it would not be a problem that i can see. these are 7.3 we are talking about. They MOVE air!!

 

[DocBar]

Yes. Dedicated race truck only. Not a street truck.

If I just wanted to do a compound, I would just use my 482 as an atmo and toss on a stock van turbo with a ww2 and waste gate the **** out of it. (No feedback on that one please. Don't like it? Go **** yourself. I would do it just to piss you people off because I would make it work and work well!) The problem is more rules than anything. My 78 F100 cab has a very shallow cowl. The firewall butts right up to the back of the engine. No room for traditional T4 piping. That's the number 1 reason I'm doing parallels. Number 2 is my Superduty headers don't fit. If I already have to buy and change them out for obs headers....... See where I'm going? Besides. I want something that is ****ing cool. Parallels do it for me.

If it's a dedicated race truck, why worry about firewalls or anything else? Just modify what needs to be modified and go with what you want.

 

[09stroker]

Parallel twins typically will flow a lot but at a lower pressure.
With that said, the heads don't flow so well so higher pressure is needed.
But if you're gonna be spraying it anything is possible.

 

[vanderchevy18]

Doc reread my post. I edited it. I left the essential info out the first time.

 

[extreme3807]

I can tell you my truck with twin compounds never really saw its true potential till 80mph or so. I know 7.3 compared to a 6.4 is a different animal, but I'm interested to see where it could take you. Everyone said my truck couldn't do ****, but you will never know until you try it


Sent from my iPhone using Tapatalk

 

[dentexpowerstroke]

Have you thought about twin 362 or 364 fmws? I don't have first hand experience but you may be able to get those to spool a little quicker. I would think the original idea of 366s and the right housing s would work, I'm just tossing out some more ideas. I think no matter what route you go this will be a pretty wicked idea.

 

[backwoodsboy]

WTF is a parallel twin? At least get the nomenclature right.

Twins(parallel if you prefer) refer to two (2) equally sized turbos with one feeding each bank of a V block or half of the cylinders of an inline block.

Compounds refer to a large atmosphere turbo feeding a smaller high pressure turbo. You can call them primary and secondary if you prefer.

The terms "twin" and "compound" are not even a cousin to interchangeable.

Saying parallel twins is synonymous to Twain saying "suppose I am a politician. Then suppose I'm an idiot. But I repeat myself". ointlaugh:

Sorry to go off on you, but this kind of crap drives me nuts. Twin turbos and compound turbos are 100% completely different. :grouphug:

I'm sure many of my mistakes drive others nuts.

:biggun:

If you're going to be a douche and correct others on a technicality, then make sure you have yours in order.
TECHNICALLY a compound turbo setup is one where the exhaust turbine is mechanically connected to the crankshaft, recovering exhaust energy in the form of rotational force as opposed to increasing air charge.
TECHNICALLY sequential turbo is what you are referring to by 'compound turbos'.

 

[vanderchevy18]

Oh good lord. Let it go guys. No more talk about nomenclature. Seriously.

Dentex I'll see when I get my turbos bought. I still need one s366 for my white truck for sure. The other 2 I still really want to do s366's. I can't see why it wouldn't work. I should be able to pick up the lag with RPM and NO2. Maybe I'll see if Barder will sponsor me a pair of turbos he thinks will be best. LOLLOLLOL