compound twin turbo's
1.0 BAR
Joined: Feb 2006
Posts: 226
Re: compound twin turbo's
Now the secondary larger turbo's compressor feeds the primary smaller turbo. This is so that the first turbo is always working with out intake loss.
Now the way compounding works is that both turbos are set to have a pressure ratio of 2.5 or so. IT IS COMPOUNDING, meaning that you multiply them together to get the amount of boost going to the engine, so you have a pressure ratio of 6.25 (2.5 * 2.5). Boost seen by the engine will be (6.25 - 1) * 14.7 = 77psi.
Now that is COMPOUND...he typed it before I did...That is the last of 3 twin styles and it is seen on larger displacment rigs!
Now the way compounding works is that both turbos are set to have a pressure ratio of 2.5 or so. IT IS COMPOUNDING, meaning that you multiply them together to get the amount of boost going to the engine, so you have a pressure ratio of 6.25 (2.5 * 2.5). Boost seen by the engine will be (6.25 - 1) * 14.7 = 77psi.
Now that is COMPOUND...he typed it before I did...That is the last of 3 twin styles and it is seen on larger displacment rigs!
0.0 BAR
Joined: May 2005
Posts: 0
Re: compound twin turbo's
Originally Posted by PoweredT3A6
Now that is COMPOUND...he typed it before I did...That is the last of 3 twin styles and it is seen on larger displacment rigs!
Yup, and that is exactly what the setup is in the OPs picture.
1.0 BAR
Joined: Dec 2006
Posts: 311
Re: compound twin turbo's
Originally Posted by PoweredT3A6
Also, AERO you must be new and quoted that from another site...because you stated the obvious with most of your paragraph: "
Originally Posted by PoweredT3A6
The first turbo would lose compression and bypass through a valve/flapper setup thats why it wouldn't spin to 5 gillion rpm and die in 2 days.
Originally Posted by PoweredT3A6
Complex...your brain is not very complex...Turbo one wouldn't spool turbo 2...TURBO ONE WOULD HELP INCREASE POWER AND RPM UNTIL EXHAUST FLOW WOULD HAVE ENOUGH CFM TO SPOOL NUMBER 2...Sequential turbo setups are common for Diesels because of their reliance on boost for all of their power, also because to handle the amount of boost that you would be forced to accomodate with that setup. Imagine, the first turbo would be a Chrysler conquest turbo(tiny), on a GSR motor with LS tranny. Second turbo would be a larger trim T4 or a GT35r. The long gears, somewhat large displacement and capacity for RPM, would allow you to spool the t25 by 2000 rpm and it would reach maximum efficientcy by 5000. The T4 would spool by 4000 easily and reach maximum efficientcy by redline, therefore creating a sequential setup....BUT the problem would be...once the t25 got maxed out it would spin too fast and eat ---- after 2 days. So it becomes more complex and not so easy to do espescially on a high reving monster like a honda...remember diesels rev to 3k...
Madmax got it right, and you hang off his nuts? Nice
0.0 BAR
Joined: Apr 2006
Posts: 0
Re: compound twin turbo's
Originally Posted by stillnoturbo
So if you know about this soo much then go ahead and do it and quit asking us. Get a ------- spine and do it if you feel it's gonna work. 
Thread Starter
0.5 BAR
Joined: Jan 2003
Posts: 152
Re: compound twin turbo's
Originally Posted by c0mpl3x
coming to hmt as a noob with questions on something that doesn't pertain to hondas, and trying to adapt it to hondas, long story short, go ---- yourself
Just because it is used on diesels does not mean that it can not be made to work on hondas or any other gas motor. I think that this would be a good way to not have tons of lag on a large turbo. Normaly this setup is used for high boost but it should still work well on lower boost like 10-15psi.
0.0 BAR
Joined: May 2005
Posts: 0
Re: compound twin turbo's
Originally Posted by stevecivic
Just because it is used on diesels does not mean that it can not be made to work on hondas or any other gas motor. I think that this would be a good way to not have tons of lag on a large turbo. Normaly this setup is used for high boost but it should still work well on lower boost like 10-15psi.
This is why jet engines have multiple compressor stages. No one single compressor is gonna give you enough efficiency at massive pressure ratios.
1.0 BAR
Joined: Feb 2006
Posts: 226
Re: compound twin turbo's
Mad's right...There are a bunch of technical reasons why those systems don't work well on gasoline engines, especially with long wide powerbands. Diesel engines are anomalies for internal combustion.
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