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Re: Hello, 3.8 noob here with a couple ?
i'm gonna tell you this: horsepower is addictive. you'll wind up wanting more and more, and small turbos just dont offer that.
thats said, from an engineering standpoint, when you go with a smaller turbo, you gain boost pretty much instantaneously, but you also reach peak boost sooner. for every bit of rev past the peak boost point, the turbo gets more and more inefficent. inefficent means it heats up the air charge and hot air leads to knock. from what i know about turbos, you want to pick something that'll start to give you boost at 30% of redline.
also something you want to consider, if you undersize the turbo, you may get a car thats a bit too jumpy. imagine if you had an oversized throttle body, so that just tapping the gas gave you 1/2 throttle you get with the normal size. you'd try to keep smooth with traffic but the car would jump every time you touch the gas, and then you'd find yourself painfully lacking topend. the best "mild turbo application" would be to get a medium sized turbo and stick to a lower boost. your daily ride will be smoother, you wont feel underpowered topend and you'll have less to worry about as far as knock goes.
you can do it, but i wouldn't recommend it. if you wanna learn more about it (we have it in the FAQ's on teh board but noone ever mentions it) you should read "Maximum Boost: Designing, Testing and Installing Turbocharger Systems" by Corky Bell. That'll give you a good primer on what you should do and what areas you have to watch plus a bunch of equations and explanations. If you want a system to work correctly, you gotta take time and plan it out, things cant just be thrown together and pray they work well cuz in all likelyhood, they wont.
edit: i wanna just make clear that a small turbo WILL give you a boost in hp but like i said, you'll find that you'll feel dead topend. the 30% is kind of a gisted thing just to get you going in the right direction...
oh, and welcome! :wavey:
Originally posted by breakmyfootoff
thats said, from an engineering standpoint, when you go with a smaller turbo, you gain boost pretty much instantaneously, but you also reach peak boost sooner. for every bit of rev past the peak boost point, the turbo gets more and more inefficent. inefficent means it heats up the air charge and hot air leads to knock. from what i know about turbos, you want to pick something that'll start to give you boost at 30% of redline.
also something you want to consider, if you undersize the turbo, you may get a car thats a bit too jumpy. imagine if you had an oversized throttle body, so that just tapping the gas gave you 1/2 throttle you get with the normal size. you'd try to keep smooth with traffic but the car would jump every time you touch the gas, and then you'd find yourself painfully lacking topend. the best "mild turbo application" would be to get a medium sized turbo and stick to a lower boost. your daily ride will be smoother, you wont feel underpowered topend and you'll have less to worry about as far as knock goes.
you can do it, but i wouldn't recommend it. if you wanna learn more about it (we have it in the FAQ's on teh board but noone ever mentions it) you should read "Maximum Boost: Designing, Testing and Installing Turbocharger Systems" by Corky Bell. That'll give you a good primer on what you should do and what areas you have to watch plus a bunch of equations and explanations. If you want a system to work correctly, you gotta take time and plan it out, things cant just be thrown together and pray they work well cuz in all likelyhood, they wont.
edit: i wanna just make clear that a small turbo WILL give you a boost in hp but like i said, you'll find that you'll feel dead topend. the 30% is kind of a gisted thing just to get you going in the right direction...
oh, and welcome! :wavey:
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