compound turbo kit?
compound turbo kit?
has anyone on the forum had any experience with a compound kit for a 13b? just wondering if anybody had tried this method. I know heat is a problem but maybe somebody has found a solution. thanks!
Compounding turbos is more for extreme high boost set ups (40~50 psi and up) and would be a complex, heavy, expensive and inefficient way to make power on a rotary, be it for the street or for a dyno queen. Unless your rich and into novelties or expensive complex ways to accomplish something that can be done simply (IE: properly sized turbo for a 13b).
~Mike.............
~Mike.............
Last edited by Zero R; May 12, 2009 at 08:18 AM.
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From: Abingdon, Md
Not necessarily for super high boost, but yes it is for higher boost. First designed for diesel engines (the new ford). This design was just used for a turbo setup on a Supra buy a shop(don't remember which one). It works very well. Its a damn good idea acutally, just may not have enough room in our engine bay.
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Not necessarily for super high boost, but yes it is for higher boost. First designed for diesel engines (the new ford). This design was just used for a turbo setup on a Supra buy a shop(don't remember which one). It works very well. Its a damn good idea acutally, just may not have enough room in our engine bay.
Here is a link: http://boostlogic.com/
Banned. I got OWNED!!!
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From: paradise Florida
I would love to see such a kit for a rotary, I've thought about it before.
the only problem that i could see is that the smaller turbo would choke out the exhaust at higher rpm on a rotary... mabey not though.
the only problem that i could see is that the smaller turbo would choke out the exhaust at higher rpm on a rotary... mabey not though.
Compounding turbos is more for extreme high boost set ups (40~50 psi and up) and would be a complex, heavy, expensive and inefficient way to make power on a rotary, be it for the street or for a dyno queen. Unless your rich and into novelties or expensive complex ways to accomplish something that can be done simply (IE: properly sized turbo for a 13b).
~Mike.............
~Mike.............
I was not personally involved with one at our shop, but one was done here at over 100psi... Couldn't deliver enough fuel in the end, even with a -12 hose with no fuel injector attached.. lol
Last edited by Zero R; May 12, 2009 at 08:19 AM.
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From: Renton/Bellevue/Seattle WA
So GT35R with a small hotside with a GT42R with a big hotside? ~700 rwhp with 20 PSi by ~3500 RPM? Interesting...
Anyone have the schematics of how this works?
thewird
Anyone have the schematics of how this works?
thewird
Basically, the smaller turbo is spooled first then the exhaust is routed to the larger turbo, then to the downpipe. The larger turbo compresses the air a little bit, then it goes directly to the air intake of the smaller turbo compressing it even more.
The idea is that the larger turbo usually cant stuff that much air into the engine at low RPM, the engine just cant take it and the turbo surges unless it has a ported shroud. With a compound setup the smaller turbo compresses the volume so it fits, meaning you can more power at lower RPM. The small turbo cant take in a big volume at low speed so you cant make power, the big turbo can take in a big volume but its not compressed enough. Put them together and its the best of both worlds. Low and high speed power. Im not positive how the wastegate system works exactly, so Im not much help there.
The idea is that the larger turbo usually cant stuff that much air into the engine at low RPM, the engine just cant take it and the turbo surges unless it has a ported shroud. With a compound setup the smaller turbo compresses the volume so it fits, meaning you can more power at lower RPM. The small turbo cant take in a big volume at low speed so you cant make power, the big turbo can take in a big volume but its not compressed enough. Put them together and its the best of both worlds. Low and high speed power. Im not positive how the wastegate system works exactly, so Im not much help there.
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From: paradise Florida
I definatly think that you could fit the setup in our engine compartment, and it wouldn't way very much more than a single setup.
heres a good example of what a compound turbo setup is, to anyone wondering.
^
Oh please don't give me any ideas... I've spent enough on this damn car...
Questions,
Would map sensor based tuning be enough for this type of setup?
I can't quite tell how the wastegates would work in that picture. I see an internal wastegate on the second turbo but nothing on the first turbo (one with the filter).
Aside from a custom manifold being made, I don't really see how it could cost too much more then a regular single turbo setup? I guess you could count the extra fuel requirements lol.
thewird
Oh please don't give me any ideas... I've spent enough on this damn car...
Questions,
Would map sensor based tuning be enough for this type of setup?
I can't quite tell how the wastegates would work in that picture. I see an internal wastegate on the second turbo but nothing on the first turbo (one with the filter).
Aside from a custom manifold being made, I don't really see how it could cost too much more then a regular single turbo setup? I guess you could count the extra fuel requirements lol.
thewird