Twin Turbo Headers Design

[Lextreme II]

What do u think? The first design is two 1.5" pipes travel above and join into a 2.13" pipe and then join into a 2.5". Two above and two below. We are looking into the header. The circle is actually after a 90 turn from the flange. Design number 1 is easier to pipe and flow more evenly.

Design number 2 is all four exhaust travel below the exit and join in the same manner as above. They are both 4 to 2 to 1 design. The second design useful for downpipe to travel above the flange. What do u think? Excuse my free hand.

 

[MrLexo]

Cool Stuff David!!! I didn't know you were an artist also ;-) haha. Hope it turns out good.

 

[Lextreme II]

Here are two pictures with down pipe.

 

[johnnygoodlife]

very very interesting

 

[Lextreme II]

Here is something i came up. Might worth the work, but equal length header. Equal.... at least i try.....

 

[Torquemonster]

If I tell you this - promise not to tell anyone? lol

Equal length headers into true merge (like Burns $400+US) collectors are good for around 20% power improvement over conventional turbo headers.... this is one area you'll be hard pressed to find 1 turbo system tuner in 10 that will know this let alone follow it. So let's keep this to ourselves here right - there's a ton of tuners out there that don't deserve to know this - so let those who do keep an edge... lol

said tongue in cheek - but half serious ;-)

the problem with equal length and true merge collectors is finding the room... in a race car you MAKE room, in a street car you have to weigh up how many weeks you are willing to stay up at night trying to find a way... lol

to answer your first question - design 2 - the log manifold header design should work better than your first design. That design works very well and maintains velocity - but don't forget to add a decent collector so you don't dump a crap load of turbulence into the turbo ex inlet... assuming you are mounting the turbo right onto it. If you are running into a pipe first - the length of that will help smooth the flow post collector.

 

[cavoretto]

Honestly, with a forced induction set up such as a turbo, header length isn't as important as when you have a naturally aspirated engine. However, with a turbo, you still need to avoid the turbulence. But most often, having something that is equal length will only take up room in the engine bay. With so much air being forced into the engine, you need to get it out as fast as possible, not necissarily as clean/free flowing and perfectly balanced as possible. Then again, equal length headers on a turbo are pretty bitchin...take a look here at http://forcedpsi.com/images/SSHeaders.jpg

Ah well, havin' a turbo would be nice either way.

 

[cavoretto]

Oh, found a better picture of those headers...
http://www.forcedpsi.com/images/Photo8.jpg

 

[Torquemonster]

Cavoretto - what you say is conventional wisdom and it works.... but the bit about good headers not being as good on turbos is wrong... sorry.

How about an extra 48rwhp even on a small engine like a 1.8 liter Honda at around 300rwhp? That is the difference between a typical short fast feeding well designed log turbo manifold setup to near equal length headers...

now figure out how much more it will be worth on a 4 liter V8....

obviously the better the non equal length headers are - the closer the gap to equal length - nevertheless there will always be a gap and where there is room AND you want the most out of it - Formula One got it right as have many others that have privately found out for themselves - it works. However in most applications the trouble is not worth the effort unles you want to cut the car up.