Nick_p

hello guys. i am allmost ready to build another turbo manifold for m engine.

i have a B16A2 engine with
cp pistons 81,5mm 9.0:1 cr
and a lot of goodies inside.
i want to make power with my GTX3076r
at the midle and high range.
my rpm limit is 9200.

i will build a ramhorn style manifold but i will make it topmount.
i think bottom mount or topmount havent any difference if the tubes is in same long and in same thick. right??

what dimension of thickness to choose to build it?
remember that the car is a street car , i really like midle-high range
and this turbo needs speed at exhaust gas to make power easy.

TheShodan

iTrader: (14)

You're not listening to what we were talking about. You'll lose every bit of response characteristics that you're trying to gain using the GTX3076R.

Check this out. https://honda-tech.com/forums/forced-induction-16/why-top-mount-2152865/
And if you don't know what measurements to make in designing your own manifold, either give up and buy one, or check with the fabrication section of H-T

Nick_p

i saw this thread. many differencies between these manifold..
thanks for this info.

BUT with the word topmount i didnt mean this huge manifold.


i mean something like this one



i will try to do my best at midle with the turbo..and in 3-4 months
i will go with sleeves to make something better..

TheShodan

iTrader: (14)

There's really no benefit to doing this on a Honda B-series engine platform. I can see a longitudinal mounted engine like an SR20DET, 1jZ-GTE or similar platform, but NOT for a Transverse mounted engine like a B-series, SR30VE or A853 SRT-4 engine.

You'll run the risk of starving the turbo due to the longer routed oil return line, and in some cases a separate sump pump.

Once again, you're really, really overthinking this.. Especially for the power level, and use you're looking for.

Nick_p

ok i havent any good knoweledge about all of these.
the last three days i try to understand and i cant.
why topmount? why bottom mount? why 42mm why 48mm
is there any reason to change it? thoughts made me crazy

i allready have a big topmount manifold
i allready have this gtx3076r.
i want 450 whp
i like to have the power close to gt3071 range..close..not the same.
i dont want a 7000-9000 car..

these are my preferences.
what can i do? change something?

i will not buy a turbo manifold because i can build my own like them
if someone tell me what i need.

sorry if i tired you.

TheShodan

iTrader: (14)

I'm not tired, but it seems as though you're trying to use the wrong information to try and get what you want anyway.. Unfortunately it won't work.

Look at that manifold link and read it carefully they go through charts, graphs, fluid dynamics, everything. Top mounts are made for larger turbos in bays that lack any room, since the turbos mainly used are for top end, large CFM turbochargers that don't want to worry about "spool" or "response" or anything that shows the characteristics that a GTX3076R was made to do. If anything, you'd be doing yourself a dis-service in doing it that way.


If you have the means to make your own, then you have means to know what materials to get and which lengths are needed. This is where the fabrication forum can help and not here. If you don't know what you need by way of lengths, materials and schedule 10 steel needed.. then no, you CAN'T build your own like them. Unfortunately, because there are many people who make these for a living to feed their family, they will not attempt to create a write-up of exactly what's needed and how, just so you can make your own.. It may not seem fair, but it is the way its done in American culture.

Here are the "styles" you want to emulate.

"Quick4 or Quick4AC"


Kook-designed "Ramhorn"


AFI-Bottom-mount


You can change manifolds (be it made, or purchased), get the right management, proper crankcase ventilation with a catchcan, and at least 880cc injectors, you'll be ok..