Twins Idea

[speedyjdl]

Has anyone ever thought of or tried building a special exhaust manifold that would allow 3 cylinders to run one turbo and the other 3 another turbo? Just a wild idea.

 

[Cummins4Life]

Yeah acouple years ago a guy did this with 2 HY35/9's, said it didnt start spooling till 2000rpm on his 24valve drag truck. I have some pictures somewhere I'll dig up and post later tonight if you want.

 

[speedyjdl]

Yeah, that would be great if you get the picks.

Could you use two different size turbos or would the uneven backpressure mess up your engine?

 

[Scrappy]

That setup will be a laggy pig! the turbos have to be matched to each other.

 

[Matt400]

I would think that set up could work, but would require 2 smaller turbos to be effective. Something from a gas application maybe.



Maybe 2 PT Cruiser chargers that feed into an HTB3 for triples!

 

[speedyjdl]

That would be cool. Then you would have the best of a parallel setup and a series setup. What if you used a supercharger to feed the HTB3? So many ideas and so little money.

 

[Cummins4Life]

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aint pretty but I guess it worked.

 

[Matt400]

Cummins4Life- thanks for the pics, always interesting to see what flows in others peoples minds.

 

[Got Smoke?]

I've got a buddy who we're always working on his truck or mine (usually mine :-laf ). We both own 12 Valve's and his dad has a 24 Valve ('02). He's been saying for a LONG time that he wasn't to eventually do this, and I think he's nuts. He's talked to people who think it would work great though so he says "someday" he will eventually try it.

 

[Jetpilot]

This setup has been done but the results were less than optimum..... You are only using 1/2 the amount of exhaust gass to spin each turbo, hence the lag. The top end is normally pretty good but the bottom end really sucks.



Running a good set of compounded twins is a better option.



Doug

 

[Hohn]

Has anyone ever thought of or tried building a special exhaust manifold that would allow 3 cylinders to run one turbo and the other 3 another turbo? Just a wild idea.

Yeah, like 5 years ago.

 

[pwerwagn]

I think its funny that we call ours twins. Normally twins are on cars that use two identical turbos, off a V-type engine. Like stealths and such.

I bet a set of true twins, tuned right, could work good on a PSD or D-Max, though. But I dont see an advantage on our inline motors. Might as well just run a compound setup.

 

[The Adjuster]

maybe the concept of two tiny turbos like in that setup, maybe a tad smaller for spoolup, then dump both into a BIG one ... and call them triplett's ... sheeesh imagine trying to plumb the pipes for that setup without cutting the inner fenders away ... okay just a thought ... but would spin well in the high rpm's.

Know a guy that tried a tapered type header (larger at the head tapering to a smaller size at the collector) trying to get the exhaust through the turbo at a higher speed but the plumbing was a nightmare and not sure he even finished the project ... wonder if that concept would aid in spoolup?



Kevin

 

[Hammer]

This setup has been done but the results were less than optimum..... You are only using 1/2 the amount of exhaust gass to spin each turbo, hence the lag. The top end is normally pretty good but the bottom end really sucks.

Its easy to see with a naked eye why this setup would not spool-up on the bottom and then run like crazy on top. There was no consideration to airflow characteristics and no thought into what cylinders needed to be sent into which charger. I am not convinced that this setup will not work but how durable the smaller chargers will be in the long run is a huge question. Look the photos over good and see if you can pick out some of the reasons they would not spool as quick.



The current "twins" everyone here brags about are not twins in my book either and I could never understand why they got called that. Compound turbos is what they truely are and they are about as far from efficent as one could get. They too are not perfect,but,with more owners and shops working on them they have been tuned enough to work.



Kevin. .

I am not sure the Cummins would benefit from a "step header" to help the removal of the exhaust gasses efficently. However,a well designed header that flows and is port matched with the head may help the exhaust to exit more efficently. Speeding up the exhaust flow with a step style header may cause a imbalance at the charger which may cause the failure of it. The true problems with a header for our trucks are numerous but two stand out easily. One is room,or lack their of it and the other would be strength to support the charger in a long term useage. There are some guys who have done them and those who I have run across have told me they wouldn't do it again as all it did as lighten their wallets... ... . Andy