what da hell is..........
01-31-03, 06:21 AM
#2
Boost controller is a device used to increase the boost that your turbocharger is running. Here is a quick rundown on what boost is, how it is measured, what it does, etc, etc...
As you probably know, the turbocharger pushes air into your engine. More air (when combined with the proper ratio of more fuel) means more power! Boost is a term used to describe the how much air pressure your turbo is forcing into the engine.
In North America, the most comman unit for measuring boost is PSI (Pounds-per-Square-Inch). In Japan the most comman unit is Bar. 14.5 psi is equal to 1 bar.
That is why you see people saying "My car runs 20 pounds of boost" or "My car runs 20 psi of boost."
There is a valve on the side of the turbocharger called the wastegate. It is a simple spring with a rod on the end which controllers a flapper door. When the pressure on the spring reaches a certain amount (PSI) the spring compresses and intern, pulls the rod, which opens up a valve. The valve redirects the exhaust gas around the turbocharger and into the exhaust system (bypassing the turbocharger). This is what keeps the turbocharger running at a certain PSI.
Most turbo cars come stock with a wastegate that opens up at about 6 - 8 psi. The 87-88 TII's come with 5.5 psi stock, and I think the 89-91 TII's come with 6.5 psi stock.
With a boost controller, what you are doing is making the wastegate hold off longer before opening. A boost controller tells the wastegate what PSI to open at, so you can increase the PSI. For example, the car may have 6.5 psi stock, and you put a boost controller on it, to allow 12 psi. More PSI = more air = more power!
Don't forget though, whenever you increase the PSI, more fuel is needed. The proper ratio of air-and-fuel must always be obtained. This means when you increase boost on your TII, you will need to upgrade to larger fuel injectors, and upgrade to a larger more poewrful fuel pump. Don't do this and say goodbye to your engine within minutes!
There are other mods you must do when increasing the boost other than just add the proper amount of fuel. For example, now that you are running more and and more fuel, you will need some type of aftermarket ECU (Engine Control Unit ... aka Computer) to properly manage the amounts so that your engine runs proper and safely. The stock turbocharger on the TII should not be run more than 16 psi at the very most!
Even doing things like putting on an exhaust system will automatically increase the boost for you. This is because it frees up exhaust gasses, allowing them to flow out easier, so the wastegate doesn't open as easily as before. Generally by putting a free flowing exhaust on a TII, you will increase your boost to about or 10 psi. This is why even putting an exhaust or intake on an RX-7 will require you to do some type of fuel system mods.
Oh, I almost forgot. There are 2 types of boost controllers. Manual ones, and electronic ones. Manual ones are simple "ball and spring" screw valves, which can be boughten for $40-70 or made for $10. Electronic ones are more complicated and control solinoids usually and cost about $300-$600. For 99% of people, a manual controller works PERFECT. I highly suggest using one, especially at the stage you are at right now.
Geese, that was long! You probably know a lot of that already, but if you didn't well there it is! Be sure to read lots in the 2nd Generation forum to learn more about boost, boost controllers, turbochargers, engine limits, fuel systems, and ECU options. Don't forget to use the Search function to look up information before asking a question in the forum. Good luck!
As you probably know, the turbocharger pushes air into your engine. More air (when combined with the proper ratio of more fuel) means more power! Boost is a term used to describe the how much air pressure your turbo is forcing into the engine.
In North America, the most comman unit for measuring boost is PSI (Pounds-per-Square-Inch). In Japan the most comman unit is Bar. 14.5 psi is equal to 1 bar.
That is why you see people saying "My car runs 20 pounds of boost" or "My car runs 20 psi of boost."
There is a valve on the side of the turbocharger called the wastegate. It is a simple spring with a rod on the end which controllers a flapper door. When the pressure on the spring reaches a certain amount (PSI) the spring compresses and intern, pulls the rod, which opens up a valve. The valve redirects the exhaust gas around the turbocharger and into the exhaust system (bypassing the turbocharger). This is what keeps the turbocharger running at a certain PSI.
Most turbo cars come stock with a wastegate that opens up at about 6 - 8 psi. The 87-88 TII's come with 5.5 psi stock, and I think the 89-91 TII's come with 6.5 psi stock.
With a boost controller, what you are doing is making the wastegate hold off longer before opening. A boost controller tells the wastegate what PSI to open at, so you can increase the PSI. For example, the car may have 6.5 psi stock, and you put a boost controller on it, to allow 12 psi. More PSI = more air = more power!
Don't forget though, whenever you increase the PSI, more fuel is needed. The proper ratio of air-and-fuel must always be obtained. This means when you increase boost on your TII, you will need to upgrade to larger fuel injectors, and upgrade to a larger more poewrful fuel pump. Don't do this and say goodbye to your engine within minutes!
There are other mods you must do when increasing the boost other than just add the proper amount of fuel. For example, now that you are running more and and more fuel, you will need some type of aftermarket ECU (Engine Control Unit ... aka Computer) to properly manage the amounts so that your engine runs proper and safely. The stock turbocharger on the TII should not be run more than 16 psi at the very most!
Even doing things like putting on an exhaust system will automatically increase the boost for you. This is because it frees up exhaust gasses, allowing them to flow out easier, so the wastegate doesn't open as easily as before. Generally by putting a free flowing exhaust on a TII, you will increase your boost to about or 10 psi. This is why even putting an exhaust or intake on an RX-7 will require you to do some type of fuel system mods.
Oh, I almost forgot. There are 2 types of boost controllers. Manual ones, and electronic ones. Manual ones are simple "ball and spring" screw valves, which can be boughten for $40-70 or made for $10. Electronic ones are more complicated and control solinoids usually and cost about $300-$600. For 99% of people, a manual controller works PERFECT. I highly suggest using one, especially at the stage you are at right now.
Geese, that was long! You probably know a lot of that already, but if you didn't well there it is! Be sure to read lots in the 2nd Generation forum to learn more about boost, boost controllers, turbochargers, engine limits, fuel systems, and ECU options. Don't forget to use the Search function to look up information before asking a question in the forum. Good luck!
02-01-03, 03:19 AM
#7
Basically it's unlimited. It's not the boost controller making the power, it just tells the turbo how much air to force in.
On a TII with stock engine internals and stock turbocharger, you can run about 15 or 16 psi of boost max.
Of course you will need a front mount intercooler, ECU upgrade, and fuel system upgrade.
But to asnwer your question, 15-16 psi (the max you can run on stock turbocharger) would yield about 250-300 rwhp. If you port the engine then you'll be looking 300-350 rwhp.
On a TII with stock engine internals and stock turbocharger, you can run about 15 or 16 psi of boost max.
Of course you will need a front mount intercooler, ECU upgrade, and fuel system upgrade.
But to asnwer your question, 15-16 psi (the max you can run on stock turbocharger) would yield about 250-300 rwhp. If you port the engine then you'll be looking 300-350 rwhp.
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