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  1. #1
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    Why don't we see more compound turbo setups?

    I know they are fairly popular in the diesel world but why don't we see more things like this?

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    Funny, I saw that on FB somewhere.... But yea compound set ups are not easy to tune AFAIK, and all that piping $#@! looks like a nightmare.

    Look at this stock factory compound setup in the SAAB cars, @VargasTurboTech Have you seen this $#@! Tony? Look at this mind$#@! in a 4banger. Just why??

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    If Saab did that from the factory I really underestimated how cool they were.

    Don't worry, Saabboost.com is not coming.
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    the BMW diesel's are compound turbos.....
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    the BMW diesel's are compound turbos.....
    The newer setups you mean or the 335d's?
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    yes and yes Click here to enlarge
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    yes and yes Click here to enlarge
    Gotcha.

    But why it is typically done on diesels instead of gasoline motors?
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    to get em up to speed quicker. Diesels have a lag issue that gasoline engines don't seem to have as bad. So, they spin the little guy to get the big guy going, then bypass the little one
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    Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
    to get em up to speed quicker. Diesels have a lag issue that gasoline engines don't seem to have as bad. So, they spin the little guy to get the big guy going, then bypass the little one
    That makes complete sense. Thanks.
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    Because of things like Twin Scroll turbo chargers and turbocharging advancements. Compound turbo chargers were fairly common in the 90's to early early 00's but seemed to have phased out. They were common on the RX-7's, Supras, and even some Skylines. HKS had a super fast R33 using this setup then they went to a large single. For what specific reason I am unsure because the T88 setup they ran had more lag than the previous setup but once they added the sequential box it was much quicker.
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    Found it.

    http://www.speedhunters.com/2010/10/..._hks_r33_gt_r/

    However, my previous post had some misinformation. The smaller one didn't spool the larger one. They were just ran in a parallel layout.
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    Click here to enlarge Originally Posted by StinkyM Click here to enlarge
    Because of things like Twin Scroll turbo chargers and turbocharging advancements. Compound turbo chargers were fairly common in the 90's to early early 00's but seemed to have phased out.
    This.

    The Mk. IV Supra was a compound turbo system, and was notorious for failures. That's why everyone went to big singles, or to a lesser extent, equal twins. It might still be beneficial to use such a system if you're going for big power and streetability from a small displacement engine, but due to emissions regulations and cost of engineering, I don't see many manufacturers going that way. It's probably cheaper from a manufacturing standpoint to use a variable vane turbine like the 997 turbos, which have most of the benefits, and none of the drawbacks of a sequential turbo system.

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    might as well just put a quick spool valve on a big single.
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Funny, I saw that on FB somewhere.... But yea compound set ups are not easy to tune AFAIK, and all that piping $#@! looks like a nightmare.

    Look at this stock factory compound setup in the SAAB cars, @VargasTurboTech Have you seen this $#@! Tony? Look at this mind$#@! in a 4banger. Just why??

    Click here to enlarge
    compound turbos harder to tune? i guess that makes sense when you have to have all solenoids and valves set up for when it starts feeding air over and crap..

    my fav twincharged setup in the history of ever:

    http://www.youtube.com/user/evomadmac

    last i checked it made something like 800whp+ with some ungodly curve and spool, and some stupidly high final boost value like 5x or 6x psi.

    http://www.madmacmotorsport.com/

    http://www.lancerregister.com/showthread.php?t=315815

    I don't think any reasonable person could call that car poorly setup in the motor department.

    honestly, my dream built car would have some kind of twincharged setup to it.

    looks simpler than a twin compound turbo setup, and i'd argue superior in many ways.
    Last edited by Flinchy; 01-18-2014 at 04:06 AM.
    boop

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    Hey this is exactly what I've been wanting to do to the n54 since the whole single turbo craze started. Only problem is, I don't own an n54 powered car. Anyone want to donate a car to the cause?

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    How about you donate the turbo setup and we'll prove it to work.

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    There are so many downsides to this type of setup. They do have pluses, though, just a lot of companies don't feel the pluses outweigh the minuses, hence why you dont see them very often.

    Most of the time single turbo > compound turbos

    The only reason you would be compelled to run compound in-series turbos is to achieve very high boost levels. Turbos only create a pressure ratio, not a differential. A pressure RATIO implies you are multiplying the pressure across the impeller so a 2.0 or 2.5 pr impeller at whatever flow, can effectively be boosted to 4.0 or 5 or 6 just by sticking another turbo into the system. Make sure the turbos are obviously able to flow the right air (look at your comp maps etc...) A setup like that is if you want to make 150 psi boost or some insane $#@! (look at big rigs).

    The only car I can see benefit from that is a very small engine that needs 80 psi boost, like a formula engine or something from the 80s.

    There are other types of compound setups, compound parallel are what the N54 already have which is just two turbos feeding one Y pipe.

    The characteristics of one turbo feeding another turbo and then feeding the engine is a little more complex then just two turbos feeding the engine.
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    Holy $#@! look at this guy^^
    long time no see.

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    What's up!!!! Long time yes but I'm back!
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


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    I see your Evo @Flinchy and raise you some nitrous.

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    That is such a sick setup I don't even know what to say other than it's clearly offsetting a few Priuses.
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    Wonder what would happen if you pulled up with that next to a neo-environmentalist youth liberal arts college student in a brand new prius that her dad bought for her... Oh I forgot to say she is texting while sitting at the light and hears this car roll up and immediately rolls down her window to try and be a good "activist" by telling you how much pollution you are creating. At that very moment in time, I would defecate in my hand, throw it in her window and then do a burnout that produces so much smoke that her prius stalls from lack of clean air (this wont be covered under warranty).
    Some people live long, meaningful lives.

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    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Wonder what would happen if you pulled up with that next to a neo-environmentalist youth liberal arts college student in a brand new prius that her dad bought for her... Oh I forgot to say she is texting while sitting at the light and hears this car roll up and immediately rolls down her window to try and be a good "activist" by telling you how much pollution you are creating. At that very moment in time, I would defecate in my hand, throw it in her window and then do a burnout that produces so much smoke that her prius stalls from lack of clean air (this wont be covered under warranty).
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    1 out of 1 members liked this post. Reputation: Yes | No
    ^^^


    "Wait hold on, cant race yet, still waiting for my turbos to spool up sequentially."

    5 minutes later...

    "Ok ready now..."
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    ...and then do a burnout that produces so much smoke that her prius stalls from lack of clean air (this wont be covered under warranty).
    Click here to enlarge

    Bwahaha! Awesome.

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