i need pics of manifold routing and wastegate setups for twin setups. also what is the common turbine sizing in dual set-ups... like .70 a/r x2

 

waste of time and money. get a nice single.

 

For the same power, twin turbos will give better midrange, response and drivabilty. So if you have the time and money, it's not a waste.

astrochild7, do a search for this. It's been discussed before and I remember some pics being posted.

 

Dyson Rotary has a used twin turbo setup for a S4/5 using two stock S4(or 5?) turbos. Made 350kw's at the wheels IIRC.

They have a picture of the manifold setup on the site aswell.

 

 

Thanks NZConvertible, I couldn't be bothered finding a link to that pic

Its custom made to fit in a first gen '7 with a 13b, but that means it will also fit in a S4/5 quite easy.

So if your making a custom manifold yourself you could probably make it a fair bit less compact than that one.

 

And considerably cheaper...

 

what size a/rs on the turbine side would you use?

would you go honda-small, like .60 or would you go higher like astrochild suggested?

 

How would you go about making custom manifolds

 

Learn to weld and bend pipes, then you can make your own manifolds.

 

just throwin some ideas around.. twin hybrids on a bridged motor is the way i'm going .. can't afford big single and i already have the others... just have weld up the mani...

 

another??? so on that previous pic with the dyson twin mani... the turbos have unequal length runners so would that mean the short one would spool a hair faaster.. making them boost unparrallel slightly the offset makes it easier to plumb for one thing.... do you really need equal length on twins i wonder????

 

re: equal length twin turbo manifold

No the manifold does not need to be equal length, it would theoretically be best to have the inlet to the turbine section as close as possible to the exhaust port for both turbos, but due to size constraints thats nearly impossible. You can still tune the exhaust to be an equal length system by having the dump pipes longer/shorter for each turbo, depending on the situation.

The tuned section doesn't stop at the turbine inlet for a twin turbo setup running one turbo off each housing as shown above, the tunned section stops when the two dump pipes merge back together.

 

Why would you do that? True duals baby! At least it'd stop those people who insist on calling the FC exhaust "fake duals".

 

going twin isn't looking that bad after all...
cake.....

 

i'd still like to find some good pics of finished products.. or unfinisded...

 

You can make a full single upgrade for around 1200 dollars. Maybe 1800 with a good intercooler and pipes for it.

 

It can be done for cheaper even,
1000 dollars for single setup plus intercooler!
(assuming you know how/ where to shop)

 

 

don't have any photos of the manifold/wastegate setup. but essentially each rotor feeds the turbos seperate. however it's only running 1 45mm wastegate where 2 pipes feed just below each outlet of the exh manifold.

they can be a pain in the *** to work on. but showed notable mid range and also better top end compared to the to4b (mind you the to4 is a 30yo design)