miataturbo.net-like debauchery thread (about the ND or something)
07-01-2015, 03:59 PM
#1301
This type of compounding is fairly common in the performance diesel truck world.
However, most of the guys don't use a computer controlled turbo, instead they use as big as they can spool, and dump the fuel to match.. lol.
Though I have seen one such system that used a variable geometry turbo, along with a fixed blade, that damn torque graph was something beautiful, I'll have to dig it up.
However, most of the guys don't use a computer controlled turbo, instead they use as big as they can spool, and dump the fuel to match.. lol.
Though I have seen one such system that used a variable geometry turbo, along with a fixed blade, that damn torque graph was something beautiful, I'll have to dig it up.
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07-01-2015, 04:02 PM
#1302
We are developing bits that fit into our standard practice, N/A with the stock block. It's completely unknown how much, if any power we'll get from the stuff we have planned. Based on the resources, parts, plans and info we have lined up already, I'm guesstimating we'll find about 35whp and another 700rpm with 100 race hour durability. No plans for F/I or swaps. I'll leave that to our friends in Colorado.
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07-01-2015, 04:07 PM
#1305
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We are developing bits that fit into our standard practice, N/A with the stock (long?) block. It's completely unknown how much, if any power we'll get from the stuff we have planned. Based on the resources, parts, plans and info we have lined up already, I'm guesstimating we'll find about 35whp and another 700rpm with 100 race hour durability. No plans for F/I or swaps. I'll leave that to our friends in Colorado.
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07-01-2015, 04:27 PM
#1307
We are developing bits that fit into our standard practice, N/A with the stock block. It's completely unknown how much, if any power we'll get from the stuff we have planned. Based on the resources, parts, plans and info we have lined up already, I'm guesstimating we'll find about 35whp and another 700rpm with 100 race hour durability. No plans for F/I or swaps. I'll leave that to our friends in Colorado.
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07-01-2015, 04:27 PM
#1308
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Kinda curious to see a cutaway of what those ports look like. And also about heat, frankly. Both with regard to all the extra heat load they just put into the cooling system as well as how that head casting is going to fare in terms of durability after a few hundred thousand km of hot/cold cycles.
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07-01-2015, 04:41 PM
#1309
Outside of gm, and a few Ford prototypes, the manifold is separated. Now, some of the high end manifolds will have dividers cast in, along with Wastgate paths that dump into the larger turbo, but your talking $2-4k manifolds + turbo, so not many people do it.
Ford was developing a "scorpion" diesel that used a twin inlet design that mimicked the basic idea. Low engine speed would divert air to the outside, (or inside paths, can't remember) decreasing spool, then once at a certain rpm, the air would dump into the middle, acting like a larger turbine.
Really cool tech, but I don't know that they got it ever figured out. I left the dealership in 07, so my knowledge base has dwindled some, (plus, my love of Cummins has taken all of my time in regards to diesel engines)
Ford was developing a "scorpion" diesel that used a twin inlet design that mimicked the basic idea. Low engine speed would divert air to the outside, (or inside paths, can't remember) decreasing spool, then once at a certain rpm, the air would dump into the middle, acting like a larger turbine.
Really cool tech, but I don't know that they got it ever figured out. I left the dealership in 07, so my knowledge base has dwindled some, (plus, my love of Cummins has taken all of my time in regards to diesel engines)
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07-01-2015, 05:50 PM
#1311
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I
Kinda curious to see a cutaway of what those ports look like. And also about heat, frankly. Both with regard to all the extra heat load they just put into the cooling system as well as how that head casting is going to fare in terms of durability after a few hundred thousand km of hot/cold cycles.
Kinda curious to see a cutaway of what those ports look like. And also about heat, frankly. Both with regard to all the extra heat load they just put into the cooling system as well as how that head casting is going to fare in terms of durability after a few hundred thousand km of hot/cold cycles.
--Ian
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07-01-2015, 06:04 PM
#1312
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It's slightly puzzling.
I mean, I understand the desire to cut down on the number of fasteners, gaskets, and discrete castings. Saves weight, manufacturing time and cost...
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07-02-2015, 08:11 AM
#1314
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Quoting Automotive Engineering Magazine:
The diesel engine’s boosting setup, comprising a pair of Garrett turbochargers and a sophisticated air-to-air intercooler array, is based on the production Sky-D. It’s the first motorsports use of a compounded turbo system, Tremblay claimed. A large low-pressure turbocharger draws in and compresses ambient air, feeding it into a smaller high-pressure turbo which compresses the air again and forces it into the intake manifold.
Compared with a single turbocharger, the compounded-turbo arrangement provides a greater range of operating efficiency, [SpeedSource President Sylvain] Tremblay said. However, it is more complex and difficult to package in the car. The arrangement is not to be confused with turbo-compounding used on some reciprocating aircraft engines and the Detroit Diesel DD15 heavy-truck diesel, where one of the turbines is connected mechanically to the engine’s crankshaft.
“And it’s not sequential like on some gasoline turbocharged engines,” Tremblay explained. “One turbo charges the other and they’re not regulated mechanically in any other way other than by the actual computer control mapping of the turbos. As one compressor stalls, the other picks up that particular boost. It’s a very effective system for the Mazda race diesel.”
Maximum boost pressure used during the race will be in the 50-55-psi (345-379 kPa) range.
Mazda races compounded-turbodiesel, new synthetic fuel - SAE International
Compared with a single turbocharger, the compounded-turbo arrangement provides a greater range of operating efficiency, [SpeedSource President Sylvain] Tremblay said. However, it is more complex and difficult to package in the car. The arrangement is not to be confused with turbo-compounding used on some reciprocating aircraft engines and the Detroit Diesel DD15 heavy-truck diesel, where one of the turbines is connected mechanically to the engine’s crankshaft.
“And it’s not sequential like on some gasoline turbocharged engines,” Tremblay explained. “One turbo charges the other and they’re not regulated mechanically in any other way other than by the actual computer control mapping of the turbos. As one compressor stalls, the other picks up that particular boost. It’s a very effective system for the Mazda race diesel.”
Maximum boost pressure used during the race will be in the 50-55-psi (345-379 kPa) range.
Mazda races compounded-turbodiesel, new synthetic fuel - SAE International
Read the entire article, so the first turbo (I'm assuming the one on the block?) spools up runs through an intercooler, than charges the second turbo, which runs through an intercooler then to the intake manifold?
I'd really like to see what the entire piping setup looks like, it sounds fascinating.
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07-02-2015, 08:28 AM
#1315
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Looks like the output of the larger compressor runs through a water-air intercooler into the inlet of the smaller compressor.
I've not found much detail on the second intercooler. The 2014 prototype Tudor car had an air-air intercooler, but that one appears to use a very different plumbing configuration entirely.
I've not found much detail on the second intercooler. The 2014 prototype Tudor car had an air-air intercooler, but that one appears to use a very different plumbing configuration entirely.
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07-02-2015, 09:25 AM
#1319
When your business partner and close personal friend is a professional photographer, you learn just how common it is for stolen photos. I've seen the bank statements showing just how much of an effect it has once a photo gets leaked/stolen. Last thing I want to do is take money from your pocket, but if it's already public, then never mind.
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