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  1. #26
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    You have a dyno to show to back that up? I would really like to see something like that. If turbo technology has come that far that is incredible.
    I'll find info.

    I'm going to make a thread comparing Parallel, Sequential and Compound turbo setups so anyone that is uninformed can look it up easily on this site.

    Compound turbocharging has been done for a while, I think even on some WWII aircraft, and is common on diesels. It is tricky to setup. The only marketed one I have seen for a automobile gas racing engine is this one from Boost Logic.

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    http://www.boostlogic.com/xcart/prod...?productid=160

    They say it feels like a small shot of nitrous spooling a large turbo, but it's there all the time. You basically have a two stage compressor, with the first stage being the compressed air from the tiny turbo, and the second stage compressing the already compressed air using the large turbo. This is NOT like a sequential setup, in this setup one turbo is actually force-feeding another turbo.

    Sequential setups just trade off exhaust gas from two different size turbos.

  2. #27
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    Makes 20psi of boost at 2800RPMs on a turbo'd non-turbo 2JZ!!! (3.0L)

  3. #28
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    Pictures of turbine sizing for Compound Turbocharging.

    Click here to enlarge
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    Early test dyno: (notice the linear torque rise instead of typical turbo curve coming onto boost)

    Click here to enlarge

  4. #29
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    reminds me of a twinscrew set up

  5. #30
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    Yeah and that's only half the dyno! That motor makes 7000RPM, an you can see the power just rising and rising, at least 700whp or close, with crazy spool!

  6. #31
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    I'll find info.

    I'm going to make a thread comparing Parallel, Sequential and Compound turbo setups so anyone that is uninformed can look it up easily on this site.

    Compound turbocharging has been done for a while, I think even on some WWII aircraft, and is common on diesels. It is tricky to setup. The only marketed one I have seen for a automobile gas racing engine is this one from Boost Logic.

    http://bimmerboost.com/images/imported/2010/12/817.jpg
    http://bimmerboost.com/images/imported/2010/12/818.jpg
    http://bimmerboost.com/images/imported/2010/12/816.jpg
    http://www.boostlogic.com/xcart/prod...?productid=160

    They say it feels like a small shot of nitrous spooling a large turbo, but it's there all the time. You basically have a two stage compressor, with the first stage being the compressed air from the tiny turbo, and the second stage compressing the already compressed air using the large turbo. This is NOT like a sequential setup, in this setup one turbo is actually force-feeding another turbo.

    Sequential setups just trade off exhaust gas from two different size turbos.
    If this works successfully why isn't it used on more cars?
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

  7. #32
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    If this works successfully why isn't it used on more cars?
    Just look at it!

    Not many people can even pull it off properly. AMS was doing one for the EVO 9 or 8 for a dyno competition but they kept having problems tuning and didn't have enough time to sort it out.

    The one they built had a compressed air feed AND intake with a motorized block off plate. Look how complicated it is.

    Click here to enlarge
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    They ended just going with a GT42R and shooting for big peak horsepower. They won!

    Link: http://forums.evolutionm.net/automot...100octane.html
    Last edited by fundahl; 12-16-2010 at 03:23 PM.

  8. #33
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    Just look at it!

    Not many people can even pull it off properly. AMS was doing one for the EVO 9 or 8 for a dyno competition but they kept having problems tuning and didn't have enough time to sort it out.

    They one they built had a compressed air feed AND intake with a motorized block off plate. Look how complicated it is.

    http://www.benzboost.com/images/impo...10/12/1044.jpg
    http://www.benzboost.com/images/impo...10/12/1045.jpg
    http://www.benzboost.com/images/impo...10/12/1046.jpg
    http://www.benzboost.com/images/impo...10/12/1047.jpg
    http://www.benzboost.com/images/impo...10/12/1048.jpg
    http://www.benzboost.com/images/impo...10/12/1049.jpg
    http://www.benzboost.com/images/impo...10/12/1050.jpg
    http://www.benzboost.com/images/impo...10/12/1051.jpg
    http://www.benzboost.com/images/impo...10/12/1052.jpg

    They ended just going with a GT42R and shooting for big peak horsepower. They won!

    Link: http://forums.evolutionm.net/automot...100octane.html
    It does look ridiculously complex but if the benefits are as you say I would like to see more people try to get it down. It just looks awesome...
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

  9. #34
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    It does look ridiculously complex but if the benefits are as you say I would like to see more people try to get it down. It just looks awesome...
    So would I. Maybe these new Formula 1 rules will help. Click here to enlarge

  10. #35
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    Race cars aren't supposed to be fuel efficient.

    For the first time in my life I can honestly say I'd rather watch NASCAR than F1. In reality I will watch neither this year. Pathetic.

  11. #36
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    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    Race cars aren't supposed to be fuel efficient.

    For the first time in my life I can honestly say I'd rather watch NASCAR than F1. In reality I will watch neither this year. Pathetic.
    If they were 1200HP would it interest you?

    I have the most fun watching rally racing in HD.

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    Very complicated system and the gains are not worth it. With todays turbo technology early spool from a big single is commonplace. There is no need for a system like that, it adds about 200 lbs of weight and not THAT much area under the curve. Thanks for the pics slicktop, though; that really shows how complicated a system can get.
    Some people live long, meaningful lives.

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    Click here to enlarge

  13. #38
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Very complicated system and the gains are not worth it. With todays turbo technology early spool from a big single is commonplace. There is no need for a system like that, it adds about 200 lbs of weight and not THAT much area under the curve. Thanks for the pics slicktop, though; that really shows how complicated a system can get.
    I see, so needlessly complex for a little shift to the left? Still cool though...
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

  14. #39
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I see, so needlessly complex for a little shift to the left? Still cool though...
    I'd say it's more than a little shift. 20psi at 2800rpm with a 3.0L motor, no nitrous or two-step, is not really possible any other way, even with a twin-scroll and that quick spool valve.

  15. #40
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    If they were 1200HP would it interest you?

    I have the most fun watching rally racing in HD.
    Nothing with 4 cylinders interests me. Rally's are cool, I'll give them that.

    A road going race car should not be powered by a 4 banger however.

  16. #41
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    Click here to enlarge Originally Posted by MHP LLC Click here to enlarge
    Nothing with 4 cylinders interests me. Rally's are cool, I'll give them that.

    A road going race car should not be powered by a 4 banger however.
    Would you argue that E30 M3s are a waste of time, as well as EVOs and STIs that have dominated Time Attack events? There are also some pretty crazy 4-banger hillclimb cars.

    Not trying to be rude or anything, I respect your opinion. I am just trying to dig deeper and find out why you hate the 4-cylinder ICE.

    I think they are all great, except for those $#@!ing lame ass, wanna be cool, obnoxiously loud for no reason, air-cooled V-twins from Harley that are 1800cc but make like 60hp......

  17. #42
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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    Would you argue that E30 M3s are a waste of time
    Different kind of era and different kind of car. The S14 was state of the art in the 80's.

    I do respect 4 bangers, the F20C is very impressive I believe.
    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale: http://www.boostaddict.com/showthrea...r-kit-for-sale

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