Twin turbo hot pipe theory

9 LIVES

9 LIVES

Demolition Expert
Joined
Oct 29, 2006
Messages
4,051
I've seen really long hot pipes between twins and very short hot pipes.

What is the theory between the two?

For example...Jeff Garmons huge twins have a hot pipe that is only a couple inches long. Just enough for I guess two flanges to connect.

On the opposite end we have Jimmy Smith's truck...another set of large twins but with a hot pipe that is almost 2 feet long.

On the line Jeff can spool his large set of twins in a couple seconds while Jimmy Smith needs a head start to stage his truck.
 
The longer the pipe, the more heat lost, the longer time to spool.

I would think you would want to keep the pipe as short as possible between the secondary and primary.
 




Here you can kinda see the hot pipe between my twins setup. The hot pipe is 33" if you measure outside of the bends and its 3.5" pipe, I think I should have used 3" for more clearance and it would have worked out fine but I am still learning. I can tell you this is a pretty big set of twins for my little 4 cylinder and I can still spool them very fast even with stock injectors. These spool as fast if not faster than the vvt turbo on my 06 duramax, I do have the hot parts wrapped with blankets to help keep the heat in and improve spoolup (thanks Levi) and the whole setup works very well. I can go from 0-60+psi in just a second or two when I mash the throttle.

I know some people get caught up in the exact science if some things but you also have to be able to run the pipe and make the turbos fit, in my case I couldnt make the hx52 fit under the hy35 with the steering and brakes and motor mount in the way so I had to put it where its at.

I do think if youre going to make a long pipe it will help to have a good blanket on it to retain the heat otherwise it could hurt spoolup (at least in my mind).
 
It's not so much about the length as it is about the diameter... :hehe:

Paul
 
There a few issues that exist:
- Development of the flow profile (not sure to what extent is relevant...highly turbulent)
- Amount of heat lost due to transmission
- compressibility of gasses (relevance??)
- space constraints (probably #1 design criteria)
 
carcrafter22 said:




Here you can kinda see the hot pipe between my twins setup. The hot pipe is 33" if you measure outside of the bends and its 3.5" pipe, I think I should have used 3" for more clearance and it would have worked out fine but I am still learning. I can tell you this is a pretty big set of twins for my little 4 cylinder and I can still spool them very fast even with stock injectors. These spool as fast if not faster than the vvt turbo on my 06 duramax, I do have the hot parts wrapped with blankets to help keep the heat in and improve spoolup (thanks Levi) and the whole setup works very well. I can go from 0-60+psi in just a second or two when I mash the throttle.

I know some people get caught up in the exact science if some things but you also have to be able to run the pipe and make the turbos fit, in my case I couldnt make the hx52 fit under the hy35 with the steering and brakes and motor mount in the way so I had to put it where its at.

I do think if youre going to make a long pipe it will help to have a good blanket on it to retain the heat otherwise it could hurt spoolup (at least in my mind).
Click to expand...


DECENT!!!!

I'd love to see more pictures and know more about that beast.
 
Pffft.

I can't even get my broken HTT to spool to 40psi from under 5psi at 2000pm in 4th gear on a roll in 10 seconds with the breaks creating a load

<--- still waiting for a gate!
 
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