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Old 05-13-2012, 12:50 PM   #651
wrxhard
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twin scroll front mount header like his first setup, then the exhuast just takes the path of the up pipe into the big azz turbo you see there. fobia, I've been wondering when somebody was gonna do this. I'm glad to see its you. Should be super wicked!!!
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Old 05-13-2012, 01:36 PM   #652
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Quote:
Originally Posted by Beetspeed View Post
Thats sick Fobia! (in a good way)
Any pics of the exhaust gas paths? I still can't 'see' how this all routes...
not to hijack but here ya go:


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Old 05-13-2012, 01:37 PM   #653
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So the downpipe of the small turbo is the exhaust gas feed of the big turbo?
If so, that must give the small turbo a lot of back pressure in the downpipe?
The big turbo then blows into the air intake of the small turbo?
So, all the charged air flow still goes through the small turbo?

Do turbos still work like that with back pressure in the downpipe and boost on the air intake?
What I mean is: do you think the small turbo will spool as fast when its downpipe is connected to a big turbo with a large turbine wheel (restriction)?

Very curieus if and how effective this works.

You posted just before me! Awesome pics btw! 1000 thanks!

Last edited by Beetspeed; 05-13-2012 at 02:00 PM.
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Old 05-13-2012, 02:02 PM   #654
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yeah and threw the testing we have done its all about flowing in certain areas. before i had a s366 as the big turbo. the 30r ramped up but started to wedge instead of ramping up like a wall. that had a .91 t4 housing on it. i swapped out turbos to a bigger t6 1.32 and it helped a lot. now that 30r can flow threw that t6 a lot easier. now after all that i was seeing 30psi at 5200. 30r making 19psi and the 80mm making 11psi. it still however is not what im looking for. i want a wall at 3500 that i can get 45+psi at. so we took the pipe off between turbos to see where the restriction is and its in that pipe. did one pull and was a straight wall at 3500. so i know now that there is no restriction in the exhaust side but in the cold side. so i ordered 3.5 inch piping and will go retest once i re do that pipe.
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Old 05-13-2012, 02:51 PM   #655
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I just came.

You still in the cities? I planned on making a trip to see your setup several years ago when you first got it running, and ended up in a whirlwind of life changing crap. Now things are more settled, and this is DEFINITELY worth seeing.

And to beetspeed: Compound turbocharging is NOT a new idea. Cummins did it to their 855's many many years ago and all the big power diesel guys run a compound (series) setup. Except they acutally compound the boost making them able to run in excess of 100psi manifold pressure.
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Old 05-13-2012, 03:53 PM   #656
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still in the cities. got a lot of crazy subie stuff going on at the moment. should be a good year. i plan on starting a thread on this soon. just wanted to have a working setup before the internet engineers start with how i did it all wrong and that wont work mumbo jumbo.
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Old 05-13-2012, 05:25 PM   #657
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Quote:
Originally Posted by wrxhard View Post
And to beetspeed: Compound turbocharging is NOT a new idea. Cummins did it to their 855's many many years ago and all the big power diesel guys run a compound (series) setup. Except they acutally compound the boost making them able to run in excess of 100psi manifold pressure.
Cheers mate!
I just read up on the concept in the meantime and your of course very right
Saw the video of Marc Evens of Boostlogic and some comments of somebody that suggested to switch the big turbo with the smaller one's place as all exhaust gas goes through both completely anyways. Interesting thought.
The vid of Chris also from Boostlogic where you hear his lexus spool twice is very exiting (don't listen to that or you'll come again ).

Its an utterly cool concept but I was concerned that it would take a lot of testing sizes of wheels, WG's, piping and such, but it looks like Fobiawrx has it almost covered with a few changes already. Awesome man!
@ Fobiawrx: Was the 80mm turbo with the T6 turbine side a deliberate next step up from the hot side of the 366 or did you just happen to get a good deal on it, even though it is freaken huge?
One other q: Is the T6 a twin entry? I guess you don;t need that with compound boosting?

Its difficult to grasp why this works so well as your blowing hot air into an intake of a turbo where its getting heated some more. I was thinking if it would help a lot if you would truely 'intercool' the air between the turbo's with an additional intercooler (maybe small chargecooler)?
Space constraint would be a problem, but would that help or does the single front intercooler do it all just as well?

This is exciting stuff!
Walter

Last edited by Beetspeed; 05-13-2012 at 05:33 PM.
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Old 05-13-2012, 05:53 PM   #658
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the turbo was the one i wanted. i knew i needed a big 1.15+ ar housing and i want to see how much power we can make on this setup. it was between a borg s475 or s480. both you can get real cheap with a 1.32 t6. i got the s480 for 825 shipped so the price was right. you need the small turbo to be able to breath threw the big one and with a 1.32 it can easily.

i have looked into cooling between turbos but feel i will be able to achieve what i want with out it. intake temps have not been any different so far. i should have the new motor done in about a month so we will find out more when we can go over 30 psi.
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Old 05-14-2012, 03:40 AM   #659
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^^ Even better then I thought! Tnx!
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Old 07-03-2012, 10:38 PM   #660
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Quote:
Originally Posted by fobiawrx View Post

Sir, I do believe you have a piece of engine stuck on your exhaust pipe.
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Old 07-04-2012, 01:49 AM   #661
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Quote:
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Sir, I do believe you have a piece of engine stuck on your exhaust pipe.
Lol, it look unreal.
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Old 07-04-2012, 03:58 AM   #662
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Quote:
Originally Posted by fobiawrx View Post
i should have the new motor done in about a month so we will find out more when we can go over 30 psi.
As you might know by now, I am VERY anxious to find out how this works out en soooo eager to see your dyno sheet!
Any progress?
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Old 07-04-2012, 10:18 AM   #663
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new motor is in the works now. should have all the testing and what not done for the shootout.
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Old 07-04-2012, 11:09 AM   #664
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big turbo low boost, feeding smaller turbo with compressed air, this is how the supra guys do it.
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Old 07-04-2012, 12:51 PM   #665
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Quote:
Originally Posted by fobiawrx View Post
new motor is in the works now. should have all the testing and what not done for the shootout.
Are we gonna represent Minnesota at the shootout or what !
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Old 07-05-2012, 04:21 PM   #666
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^what day is the shootout?
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Old 07-05-2012, 06:11 PM   #667
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aug 4th
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Old 07-05-2012, 07:06 PM   #668
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Just look for staged turbo diesels on google and you'll see tons of dual and triple turbo setups. Heck 200psi of boost was used and if you buy a Diesel Tuner mag they sell twin staged kits for Dodges you just bolt on

Not a kit pic
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Old 10-15-2012, 08:30 AM   #669
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Done any new testing with your compound set-up Fobia?
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Old 10-15-2012, 09:52 AM   #670
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yeah. ill start a thread in a bit about it
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Old 10-19-2012, 05:22 PM   #671
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MOTHER OF PIPE *remove glasses*
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