turbo question

[Anonymous]

I have heard of running one turbo into another, but what about running two exhaust pipes through the same turbo? If you put somekind of Y pipe, and then a small reducer, would it increase the velocity of the exhaust cases, and thus increase the speed of the turbo? I could see how it wouldn't work, but also how possibly could. Does anyone know for certain if it would?
Another question about turbos. They basicly have two operation components, a turbine, and a compressor right? Is there someway that you could run two turbine sections and have them both powering the same compressor section? Theoretically, wouldn't that help eliminate turbo lag? You would have twice the amount of normal force powering the compressor side of things wouldn't you? Could you even possibly get the turbo to run faster, creating more boost? Just a thought. Entirely theoretical. Thought it might be work pondering.

 

[Anonymous]

I have heard of running one turbo into another, but what about running two exhaust pipes through the same turbo? If you put somekind of Y pipe, and then a small reducer, would it increase the velocity of the exhaust cases, and thus increase the speed of the turbo? I could see how it wouldn't work, but also how possibly could. Does anyone know for certain if it would?.

this already in use, but with out the y pipe section, its called a split pulse turbine housing, also known as a twin scroll, the turbine has 2 entry ports, and the i6 absolutely love em, the turbo effectivley has 2 turbine housings on the one turbine and outlet, sppol time is faster, and is able to spin to greater rpm, i am using one on my turbo falcon six, they are a great bloody thing. you feed ports 123 to one scroll, and ports 456 to the other scroll.

http://static.howstuffworks.com/gif/turbo-housing.jpg

look at the turbine housing, u'll notice the twin entry.

Another question about turbos. They basicly have two operation components, a turbine, and a compressor right? Is there someway that you could run two turbine sections and have them both powering the same compressor section? Theoretically, wouldn't that help eliminate turbo lag? You would have twice the amount of normal force powering the compressor side of things wouldn't you? Could you even possibly get the turbo to run faster, creating more boost? Just a thought. Entirely theoretical. Thought it might be work pondering.

i dont think it would work this set up...as the compressor compresses air, having a pipe leading into the compressor cover is just a place for compresses are to get out, you'd findthe compreresed air would force the exhaust gas pulses back where they came from.

cheers.joe.

 

[80broncoman]

I have seen a small turbo running into a larger one. In fact I have seen three inline turbos before. I have only seen this on pulling tractors. I belive this is to cut down on lag time. every one had a large wastgate except for the last one because the smaller ones would have been such an exh restriction. Jim

 

[Anonymous]

You sure that wasn't a larger one running into a smaller one?


-=Whittey=-

 

[CobraSix]

twin sequiental turbos are common. Volvo uses them. the small one feeds into the larger one. The lag is greatly reduced with this set up.

Slade

 

[Anonymous]

Why would the small feed the large?


-=Whittey=-

 

[CobraSix]

teh smaller one feeds the larger one, because the smaller one spools up faster.

Or do I have that backwards? I'm so confused now.

Slade

 

[Kstang]

i am pretty sure you have that right, smaller one spools up faster to feed the bigger one that spools slower

kevin

 

[Anonymous]

The outside one should be the largest because it is pushing the largest volume of air. For example:

Air -> Turbo1 -> Turbo2 -> Motor

Say you want 2bar and that the engine can take in 10 cubic feet of air naturally aspirated. This would mean you compress 20 cubic feet of air into the engine. So the first turbo takes in 20 cubic feet of air and compresses it into 15 cubic feet of air. The second takes in 15 cubic feet and compresses it to 10 cubic feet. The larger turbo moves the largest volume of air (though both move the same mass of air).


-=Whittey=-

 

[CobraSix]

But, if you put the larger one in first, don't you have the same problem of having a larger turbo of the extreme lag? I thought that's why you'd want the smaller one first.

Slade

 

[Anonymous]

Sequential turbos aren't for lag but for high boost. Parallel turbos are for lag (less inertia). You see tractor pullers running three in a row because they are pushing over 250psi and you're not getting that kind of boost out of a single turbo. They are used in production cars for a couple reasons:
1) Marketing (two turbos, it must be fast!)
2) Production turbos are very undersized for the lag reason, and in the case of sequential low-boost turbos, they aren't doing all that much work (so you can use a smaller physical sized turbo to pump the air because you're not compressing it much, which would keep your lag down)


-=Whittey=-

 

[CobraSix]

I see said the blind man...while he listens to the mute man...

Slade

 

[Anonymous]

I see said the blind man to his deaf daughter while pissing into the wind. It's all comming back to me now.


-=Whittey=-

 

[Anonymous]

Speaking of turbos and compound setups, Hot Rod magazine has a nice two part feature article on turbocharging (DEC). Worth the $5. + there are some nice lookin honnies in there too.

 

[Anonymous]

i see said the blind man to his deaf son whilst reading the book of proper english.

cheers.joe.

 

[Anonymous]

It would appear that we have an over abundance of blind men.

 

[J.R.]

What's the daughter look like? Does she like ol' trucks?

J.R.

 

[Kstang]

we dont know, were all blind men!!!!