I saw on another site someone had an Idea instead of routing the traditional twin setup like we have seen they run the outlet of the small turbo into the hot pipe instead of the intercooler, basically the engine exhaust would be running through the small one, and the big one would be spooled by the exhaust AND the outlet of the compressor of the small one. The large turbo compressor would just have an air filter on it and run straight into the intercooler. make sense?


would this work?

 

I understand what you are saying, but not sure how it would work, it is kind of expecting a net gain in energy but ignoring the lack of adding input to the system, if anything it is a restriction and a heat loss before the second turbo.

 

This will not work to improve performance, and for it to do so, it would have to disobey the second law of thermodynamics. Remember what a turbocharger is... it is a gas turbine driving a centrifugal compressor. The gas turbine is a heat engine, converting the heat energy of the exhaust into work. In the proposed setup, the small charger will use some of the exhaust energy to compress air, which then enters the turbine of the large charger. In doing so, the small charger is creating a restriction in the exhaust of the engine, plus removing heat energy in the exhaust which would have been available to the second charger, and finally, the grand slam of failure, after taking additional losses in compressing the air, its dumping its warm air into the turbine of the large charger, cooling the hot exhaust gasses and thus removing the very energy source required to drive the turbine in the first place. Essentially, you have a heat engine taking its losses all along the way, only to dump its ‘work' into a heat ‘sink’ of already higher energy.

This is akin to having an engine driven generator powering an electric motor and then connecting that electric motor to the engine driven generator and saying you will now make more power...





Kp

 

thank you for clarification, I found that Idea over on www.turbododge.com in the turbo section, basically they are talking about using two small turbos piped like that to run a huge turbo in a minivan, it would probably look pretty sweet though.

 

Compound turbos setups work well.

People just dont like change.

 

Hey 600- can you suggest a better way to set up twins?
You've dropped hints in the past but haven't really spilt the beans

 

No, I cant suggest a better way. The ONLY way to run twins on our trucks is compounded (in series). You can play around a little with sizes but a HT3B as a primary and a HX35w as a secondary is pretty darn good any way you cut it.



Kp

 

I've had 35/14wg/3b, 40/14wg/3b, and 40/16wg/3b all on my pickup. IMO for daily driving, towing and just all around use 35/14wg for a top turbo is the only way to go. Right now I've got the 40/16 on for sled pulling, but as soon as pulling season is over the 35 is going back on.

 

yea basically people think its the velocity and volume of the air moving thru the turbine that spin the turbo...but its the heat which really does it.

ever see those "whiley bird" fans in the attic of a house. its not the speed or volume of air moving thru them that makes them turn...its the heat in the attic that escapes upward and causes them to spin