Out of Curiosity
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The little 5.0 that could
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Out of Curiosity
I'm wondering what the advantage of converting an mkIV supra into a single turbo. I ran a yahoo search, looked for about 15 minutes and didn't find anything. Logically speaking, it doesn't seem to be beneficial to have 1 rather than 2, is there a simple explanation for this popular upgrade?
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no setup can be justified as "better" than the other. both have their advantages, and disadvantages. twin turbos in a sequential setup where one turbo begins to spool, then a few hundred, or in some cases thousand rpms later the other begins to spool up, generally offer a more linear power curve. the idea is to mirror a naturally aspirated power curve, where the majority of the power delivery falls over a wide range of the power band, to give the most "usable power" to the driver. the downside to this, is that most sequential applications are complex, and most aftermarket tuners have not tried to duplicate the stock setups to create big power* this means sequential setups are for the most part, limited to the maximum flow of the stock twins which come with the car. so in this application, around generally around 450-500 rwhp. it is this reason which drives many to "go single."
by switching to a single turbo which can flow much more cfm into the engine than the stock twins, more horsepower can be created. again, with regard to supras, this figure ranges anywhere from about 450-1000+ historically, the downside to a single turbo setup is that they generally tend to have a much sharper power curve than a sequential setup. in other words, though the turbos are making more power, because they are larger they tend to be more efficient than their smaller counterparts, and this makes their spool characteristics often very off/on. power will often jump two or three hundred horsepower in the space of 500-1000 rpms. this also tends to happen later in the rpm range because it takes more air to turn a larger turbine, and more rpms to create that spool. so after all is said and done, the single will create a huge jump of horsepower later in the power band than the smaller sequential setup. also, not that most aftermarket twin turbos are run in true twin, or parallel operation. this means they spool simultaneously, and operate like one big turbo. these usually follow the characteristics of large singles, don't be fooled into thinking they are "better" or "worse" than a single.
however, recently smaller single turbos have began to creep into the market which offer a compromise, in an attempt to give stock-like spool, eliminating the lag introduced by a large single, but ultimately at the cost of top end power. there are many diffrent turbos out there, so poke around and look at some dyno sheets of those who have the turbos you might be interested in. also, keep in mind, a lot more affects power, and driving characteristics of the car than just the turbo. manifold type, plumbing, and all sorts of other aspects of a car relate directly to it's performance. with proper research, it's easy to see what combos and setups work well. find out what you want out of your car, and look at other's setups which produce the results you are looking for. good luck
by switching to a single turbo which can flow much more cfm into the engine than the stock twins, more horsepower can be created. again, with regard to supras, this figure ranges anywhere from about 450-1000+ historically, the downside to a single turbo setup is that they generally tend to have a much sharper power curve than a sequential setup. in other words, though the turbos are making more power, because they are larger they tend to be more efficient than their smaller counterparts, and this makes their spool characteristics often very off/on. power will often jump two or three hundred horsepower in the space of 500-1000 rpms. this also tends to happen later in the rpm range because it takes more air to turn a larger turbine, and more rpms to create that spool. so after all is said and done, the single will create a huge jump of horsepower later in the power band than the smaller sequential setup. also, not that most aftermarket twin turbos are run in true twin, or parallel operation. this means they spool simultaneously, and operate like one big turbo. these usually follow the characteristics of large singles, don't be fooled into thinking they are "better" or "worse" than a single.
however, recently smaller single turbos have began to creep into the market which offer a compromise, in an attempt to give stock-like spool, eliminating the lag introduced by a large single, but ultimately at the cost of top end power. there are many diffrent turbos out there, so poke around and look at some dyno sheets of those who have the turbos you might be interested in. also, keep in mind, a lot more affects power, and driving characteristics of the car than just the turbo. manifold type, plumbing, and all sorts of other aspects of a car relate directly to it's performance. with proper research, it's easy to see what combos and setups work well. find out what you want out of your car, and look at other's setups which produce the results you are looking for. good luck
Elitist Supra Asshole :)
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neither makes more power than the other... one of the most famous street MKIV's on this side of the pone still has twins... not stock, but still twins.
twins give you more linear power where a big single is kind of like nothing and then everything. idle to 4000rpm might take a long time and then after 4000 rpm, the rev limiter will hit before youre ready.
twins usually cost more money though... twice the stuffs to buy and more stuff to install/fabricate/engineer.
twins give you more linear power where a big single is kind of like nothing and then everything. idle to 4000rpm might take a long time and then after 4000 rpm, the rev limiter will hit before youre ready.
twins usually cost more money though... twice the stuffs to buy and more stuff to install/fabricate/engineer.
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Originally posted by SupraKid
no setup can be justified as "better" than the other. both have their advantages, and disadvantages. twin turbos in a sequential setup where one turbo begins to spool, then a few hundred, or in some cases thousand rpms later the other begins to spool up, generally offer a more linear power curve. the idea is to mirror a naturally aspirated power curve, where the majority of the power delivery falls over a wide range of the power band, to give the most "usable power" to the driver. the downside to this, is that most sequential applications are complex, and most aftermarket tuners have not tried to duplicate the stock setups to create big power* this means sequential setups are for the most part, limited to the maximum flow of the stock twins which come with the car. so in this application, around generally around 450-500 rwhp. it is this reason which drives many to "go single."
by switching to a single turbo which can flow much more cfm into the engine than the stock twins, more horsepower can be created. again, with regard to supras, this figure ranges anywhere from about 450-1000+ historically, the downside to a single turbo setup is that they generally tend to have a much sharper power curve than a sequential setup. in other words, though the turbos are making more power, because they are larger they tend to be more efficient than their smaller counterparts, and this makes their spool characteristics often very off/on. power will often jump two or three hundred horsepower in the space of 500-1000 rpms. this also tends to happen later in the rpm range because it takes more air to turn a larger turbine, and more rpms to create that spool. so after all is said and done, the single will create a huge jump of horsepower later in the power band than the smaller sequential setup. also, not that most aftermarket twin turbos are run in true twin, or parallel operation. this means they spool simultaneously, and operate like one big turbo. these usually follow the characteristics of large singles, don't be fooled into thinking they are "better" or "worse" than a single.
however, recently smaller single turbos have began to creep into the market which offer a compromise, in an attempt to give stock-like spool, eliminating the lag introduced by a large single, but ultimately at the cost of top end power. there are many diffrent turbos out there, so poke around and look at some dyno sheets of those who have the turbos you might be interested in. also, keep in mind, a lot more affects power, and driving characteristics of the car than just the turbo. manifold type, plumbing, and all sorts of other aspects of a car relate directly to it's performance. with proper research, it's easy to see what combos and setups work well. find out what you want out of your car, and look at other's setups which produce the results you are looking for. good luck
no setup can be justified as "better" than the other. both have their advantages, and disadvantages. twin turbos in a sequential setup where one turbo begins to spool, then a few hundred, or in some cases thousand rpms later the other begins to spool up, generally offer a more linear power curve. the idea is to mirror a naturally aspirated power curve, where the majority of the power delivery falls over a wide range of the power band, to give the most "usable power" to the driver. the downside to this, is that most sequential applications are complex, and most aftermarket tuners have not tried to duplicate the stock setups to create big power* this means sequential setups are for the most part, limited to the maximum flow of the stock twins which come with the car. so in this application, around generally around 450-500 rwhp. it is this reason which drives many to "go single."
by switching to a single turbo which can flow much more cfm into the engine than the stock twins, more horsepower can be created. again, with regard to supras, this figure ranges anywhere from about 450-1000+ historically, the downside to a single turbo setup is that they generally tend to have a much sharper power curve than a sequential setup. in other words, though the turbos are making more power, because they are larger they tend to be more efficient than their smaller counterparts, and this makes their spool characteristics often very off/on. power will often jump two or three hundred horsepower in the space of 500-1000 rpms. this also tends to happen later in the rpm range because it takes more air to turn a larger turbine, and more rpms to create that spool. so after all is said and done, the single will create a huge jump of horsepower later in the power band than the smaller sequential setup. also, not that most aftermarket twin turbos are run in true twin, or parallel operation. this means they spool simultaneously, and operate like one big turbo. these usually follow the characteristics of large singles, don't be fooled into thinking they are "better" or "worse" than a single.
however, recently smaller single turbos have began to creep into the market which offer a compromise, in an attempt to give stock-like spool, eliminating the lag introduced by a large single, but ultimately at the cost of top end power. there are many diffrent turbos out there, so poke around and look at some dyno sheets of those who have the turbos you might be interested in. also, keep in mind, a lot more affects power, and driving characteristics of the car than just the turbo. manifold type, plumbing, and all sorts of other aspects of a car relate directly to it's performance. with proper research, it's easy to see what combos and setups work well. find out what you want out of your car, and look at other's setups which produce the results you are looking for. good luck
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The Fat Cobra
Joined: Apr 2003
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Originally posted by MR2driver
That was sure a lot said by a guy who isn't even turbo
That was sure a lot said by a guy who isn't even turbo
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You need to grab ahold of that line between speed and chaos, and you need to wrestle it to the ground like a demon cobra.-Talladega Nights
You need to grab ahold of that line between speed and chaos, and you need to wrestle it to the ground like a demon cobra.-Talladega Nights
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The little 5.0 that could
Joined: Apr 2003
Posts: 13,275
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Originally posted by SupraKid
no setup can be justified as "better" than the other. both have their advantages, and disadvantages. twin turbos in a sequential setup where one turbo begins to spool, then a few hundred, or in some cases thousand rpms later the other begins to spool up, generally offer a more linear power curve. the idea is to mirror a naturally aspirated power curve, where the majority of the power delivery falls over a wide range of the power band, to give the most "usable power" to the driver. the downside to this, is that most sequential applications are complex, and most aftermarket tuners have not tried to duplicate the stock setups to create big power* this means sequential setups are for the most part, limited to the maximum flow of the stock twins which come with the car. so in this application, around generally around 450-500 rwhp. it is this reason which drives many to "go single."
by switching to a single turbo which can flow much more cfm into the engine than the stock twins, more horsepower can be created. again, with regard to supras, this figure ranges anywhere from about 450-1000+ historically, the downside to a single turbo setup is that they generally tend to have a much sharper power curve than a sequential setup. in other words, though the turbos are making more power, because they are larger they tend to be more efficient than their smaller counterparts, and this makes their spool characteristics often very off/on. power will often jump two or three hundred horsepower in the space of 500-1000 rpms. this also tends to happen later in the rpm range because it takes more air to turn a larger turbine, and more rpms to create that spool. so after all is said and done, the single will create a huge jump of horsepower later in the power band than the smaller sequential setup. also, not that most aftermarket twin turbos are run in true twin, or parallel operation. this means they spool simultaneously, and operate like one big turbo. these usually follow the characteristics of large singles, don't be fooled into thinking they are "better" or "worse" than a single.
however, recently smaller single turbos have began to creep into the market which offer a compromise, in an attempt to give stock-like spool, eliminating the lag introduced by a large single, but ultimately at the cost of top end power. there are many diffrent turbos out there, so poke around and look at some dyno sheets of those who have the turbos you might be interested in. also, keep in mind, a lot more affects power, and driving characteristics of the car than just the turbo. manifold type, plumbing, and all sorts of other aspects of a car relate directly to it's performance. with proper research, it's easy to see what combos and setups work well. find out what you want out of your car, and look at other's setups which produce the results you are looking for. good luck
no setup can be justified as "better" than the other. both have their advantages, and disadvantages. twin turbos in a sequential setup where one turbo begins to spool, then a few hundred, or in some cases thousand rpms later the other begins to spool up, generally offer a more linear power curve. the idea is to mirror a naturally aspirated power curve, where the majority of the power delivery falls over a wide range of the power band, to give the most "usable power" to the driver. the downside to this, is that most sequential applications are complex, and most aftermarket tuners have not tried to duplicate the stock setups to create big power* this means sequential setups are for the most part, limited to the maximum flow of the stock twins which come with the car. so in this application, around generally around 450-500 rwhp. it is this reason which drives many to "go single."
by switching to a single turbo which can flow much more cfm into the engine than the stock twins, more horsepower can be created. again, with regard to supras, this figure ranges anywhere from about 450-1000+ historically, the downside to a single turbo setup is that they generally tend to have a much sharper power curve than a sequential setup. in other words, though the turbos are making more power, because they are larger they tend to be more efficient than their smaller counterparts, and this makes their spool characteristics often very off/on. power will often jump two or three hundred horsepower in the space of 500-1000 rpms. this also tends to happen later in the rpm range because it takes more air to turn a larger turbine, and more rpms to create that spool. so after all is said and done, the single will create a huge jump of horsepower later in the power band than the smaller sequential setup. also, not that most aftermarket twin turbos are run in true twin, or parallel operation. this means they spool simultaneously, and operate like one big turbo. these usually follow the characteristics of large singles, don't be fooled into thinking they are "better" or "worse" than a single.
however, recently smaller single turbos have began to creep into the market which offer a compromise, in an attempt to give stock-like spool, eliminating the lag introduced by a large single, but ultimately at the cost of top end power. there are many diffrent turbos out there, so poke around and look at some dyno sheets of those who have the turbos you might be interested in. also, keep in mind, a lot more affects power, and driving characteristics of the car than just the turbo. manifold type, plumbing, and all sorts of other aspects of a car relate directly to it's performance. with proper research, it's easy to see what combos and setups work well. find out what you want out of your car, and look at other's setups which produce the results you are looking for. good luck
), but to just be more informed on the subject because I have a friend who just went to a single turbo in the t60 size, but that's not exactly what his turbo is, just the relative size of it. I just figured logically that the single wouldn't have near the power that the twin sequential had down low which is very important for a daily driver, but I guess when you start from a 70mph roll it doesn't really matter, 
The Fat Cobra
Joined: Apr 2003
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Check out t04r.com to see some dyno sheets of big single turbo supras. They make about 200 rwhp up to ~3.5k, then the power curve goes up about 90*.
__________________
You need to grab ahold of that line between speed and chaos, and you need to wrestle it to the ground like a demon cobra.-Talladega Nights
You need to grab ahold of that line between speed and chaos, and you need to wrestle it to the ground like a demon cobra.-Talladega Nights
