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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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04-06-2017, 07:39 PM | #1 |
Zilvia FREAK!
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Compound turbo setups.
Alright guys school me on compound setups! I've researched it all and have seen the few setups people have done. I've even checked out our quadtrac case at work with compound turbos
My only concern is finding the right turbo to match. My engine is Rb25 with rb26 internals and a precision 6266. Supporting mods up to 800hp but capping it roughly around 500 until I add a metal head gasket. Thanks and I'm sorry if this was the wrong section. Carry on.
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04-06-2017, 07:43 PM | #2 |
Nissanaholic!
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Do you have an unlimited budget?
-find someone to work the details for you Are you a professional fabricator? -figure out what's necessary Neither? -Don't bother and do a simple nitrous/turbo set up.
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04-06-2017, 08:51 PM | #3 | |
Zilvia FREAK!
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Quote:
Everything will be done by me, I'm just hung up on a proper turbo to match with my 6266.
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04-07-2017, 08:12 AM | #6 |
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Dodge Cummins forums will be the best source of evidence. Found a nice article on a build thread for DSM's here http://www.dsmtuners.com/threads/my-...set-up.336541/
Might want to reach out to people like Full Race for turbo matching or someone with a few years of turbo technology expertise. |
04-07-2017, 08:37 PM | #7 |
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There's no point in a compound setup on a spark ignition engine. You're too octane limited to make use of the stupid high boost pressures that'd create.
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04-07-2017, 09:17 PM | #8 |
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Im so glad this came up. I was thinking similar idea with compound boost recently but with a super charger. Stumbled across HKS super GT. Figured if, there is a way to mount it by the intake side with an excessive intake to free up some room and work out a bracket/pulley system it should be a killersetup for a ka. Just have your turbo, then have the cold pipe link right up into the supercharger. The cool thing about the hks it has a bypass valve so you could have whatever boost at low rpms hit then shut it down once the turbo is hitting boost and have that take over completly.
The issue if you mount it up is do you feed the supercharge into the turbo or feed the turbo into the supercharger. I havent done crazy research but something like the lancia delta would work out great if you can bolt up the hks. |
04-07-2017, 10:28 PM | #9 |
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Compound turbo setups are sweet, you can get that sweet top end that a big turbo gives you and keep good response with a rich low end/mid range.
A guy here in AZ, Jon, who owns a shop called Future Fabrication built a sweet compound setup on his 1jz S13 a while back. It fucking ripped, I don't think it was ever dyno tuned, but on the track it proved it was able to throw down. The setup was super simple, modified stock manifold with an external waste gate, stock CT15 turbo and a big ass turbo set on top using a simple "up-pipe" from the stock turbo's outlet. The big turbo stuck out the hood, but it was awesome proof of concept. |
04-08-2017, 08:31 PM | #10 | |||
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I've helped build two compound setups that were both on a successful drag car that continues to run mid nine seconds. 2. A common mistake is to run too small of a low pressure turbo (small), and to run too small of a turbine housing on the high pressure turbo (big). 3. I'd recommend running something like a V-band GTX2860 for the low pressure turbo, with the primary wastegate venting to atmosphere. 4. 800hp in a compound setup is a LOT of torque for an RB25. You're going to break things, even with RB26 internals. Better build that thing to the hilt, and hope you have a proper oiling system if you're wanting that much power. Quote:
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04-08-2017, 11:31 PM | #12 | |
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Quote:
A lot of great info thanks for the help! I'm not going to push more than 600 to the wheels if that, I would like the car driveable heh. I'm kinda stuck with the 6266. I'm also tuned on e85 using aem series2. I'm not looking for crazy power. A streetable setup is what I'm shooting for. Keep up the info!
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04-11-2017, 08:48 PM | #13 | |
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I'd say do some serious reading, develop your own theory, and run with it! Just keep in mind backpressure and heat are probably your two biggest enemies.
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04-11-2017, 08:37 PM | #15 | |
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This is hands down the best thread on the internet I have found, but it still leaves a lot of questions unanswered. http://www.yellowbullet.com/forum/sh...216811&page=75
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04-11-2017, 09:19 PM | #16 | |
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Although I have zero real world experience building crazy setups like that one, I think I understand why his setup works so well. I think most would expect a wastegate between the first and second turbo, like he is running, to send exhaust gases around the first turbo to the second once a certain boost pressure is achieved. This keep the first turbo from seeing insanely high shaft speeds and helps spool of the second larger turbo. His second wastegate placement got me thinking though. I think most would expect a second wastegate before the second turbo venting to atmosphere, but with a motor seeing very high boost that would never work due to the limitations of flow through and around the smaller turbo. An engine seeing 40+psi of boost at high rpm is going to have an incredible amount of energy flowing through the exhaust, more than enough to spool a pair of turbos and keep them spinning. Having a second wastegate before both turbos allows for some of this excess energy to be bled off in the high rpm that would more than likely overwhelm the small turbo and wastegate between turbos. It also keeps back pressure low and the exhaust gases flowing smoothly through both turbos. Correct me if I am wrong though, I would love to learn more about setups like that one. I really like the idea of using a pair of well sized turbos to keep great response, setup some wastegates and forget about it instead of trying to spool a massive turbo using something like Nitrous and extra tuning. |
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04-11-2017, 11:23 PM | #17 | |
Nissanaholic!
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Quote:
This seems like one of those things that in theory sounds pretty simple and easy to do, but in reality is really complex. Im thinking finding the right way to control the smaller turbo WG is one of the hardest things. Question: does the boost from the bigger turbo (once it starts pumping) force the compressor wheel from the smaller turbo to spin faster even if (the smaller turbo's) wasgate is open?
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04-13-2017, 12:16 PM | #18 | |||
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Quote:
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You can do some math to figure out where on the map the low-pressure turbo is operating if the inlet pressure is above atmospheric, and Kevin Jewer (the guy with the setup pictured) does a decent job explaining the math in the yellow bullet thread, but I'm not convinced that his theories are right. He does have the most extensive pressure and temperature data logging setup of anyone with a compound setup I know though. Again, I would love to build such a setup with some serious temperature and pressure datalogging and run various boost control strategies to see how efficiency and power output are affected.
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04-10-2017, 05:51 AM | #19 |
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04-14-2017, 01:51 PM | #20 |
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http://www.suprastore.com/spquspva.html
Speaking of twin scroll, this are rather popular in the JZ world.
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04-14-2017, 02:05 PM | #21 | ||
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Quote:
Quote:
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05-08-2017, 08:34 PM | #24 |
I had seen this quite a bit on the 5.9 Cummins motors. They seemed to all use massive s4xx series BW turbos. From what I observed it helps mid range at the expense of high end up. Between the expense of 2 to 3 of everything. Room in the engine bay for placement this is not something to do on a budget....
I think a twin scroll turbo with a quick spool valve might be the best compromise. Sent from my XT1575 using Tapatalk |
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