What makes turbos spool?
Sep 21, 2006, 11:22 AM
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What makes turbos spool?
Well kids like the title says; what make turbos(anysize) actually start to spool.... i know strokers kits make bigger turbos spool faster but just wanted to know if its the ecu, engine that make a turbo start to spool...
Sep 21, 2006, 11:29 AM
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Here ya go...http://auto.howstuffworks.com/turbo.htm
Sep 21, 2006, 12:13 PM
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Larger displacement = more air+fuel = more exhaust gas = faster scrolling turbo. Timing advances might help the car move a bit faster with a slight increase in low end power, but there's no way you can cheat the fact it's a 2.0 liter motor with a 8.8:1 compression ratio.
Sep 21, 2006, 02:04 PM
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I removed several hmmmm "dumb" remarks as off topic comments. 
And one of the reasons many people do not post here. What is amusing to me is that the majority of kibitzers do not speak "pressure ratio" or understand the actual dynamics of fluid flow on turbines and compressors. If you guys want to make this a technical discussion, then have it. If you want it to be a thread to embarrass the OP and yourselves, then I'll move it to OT. Thanks.
Speedlimit...
And one of the reasons many people do not post here. What is amusing to me is that the majority of kibitzers do not speak "pressure ratio" or understand the actual dynamics of fluid flow on turbines and compressors. If you guys want to make this a technical discussion, then have it. If you want it to be a thread to embarrass the OP and yourselves, then I'll move it to OT. Thanks.Speedlimit...
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Sep 21, 2006, 02:15 PM
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Ah poo, speedlimit pulled me over for posting wrecklessly.
Honestly, it's the exhaust gas that spools the turbo. How is it done? Howstuffworks is a good site to teach you the basics. Why does a stroker kit enable a turbo that went full boost at 3500 rpms to a lower rpm? Because you've increased the force that's acting on the turbine wheels thereby allowing a faster spool up. It's just like some skinny weiner kid trying to spin a merry go round at the playground and taking his sweet time while the big bad bully kid can make it spin at a fast rate early on. Basic physics.
Honestly, it's the exhaust gas that spools the turbo. How is it done? Howstuffworks is a good site to teach you the basics. Why does a stroker kit enable a turbo that went full boost at 3500 rpms to a lower rpm? Because you've increased the force that's acting on the turbine wheels thereby allowing a faster spool up. It's just like some skinny weiner kid trying to spin a merry go round at the playground and taking his sweet time while the big bad bully kid can make it spin at a fast rate early on. Basic physics.
Sep 21, 2006, 02:20 PM
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Originally Posted by Speedlimit
I removed several hmmmm "dumb" remarks as off topic comments. And one of the reasons many people do not post here. What is amusing to me is that the majority of kibitzers do not speak "pressure ratio" or understand the actual dynamics of fluid flow on turbines and compressors. If you guys want to make this a technical discussion, then have it. If you want it to be a thread to embarrass the OP and yourselves, then I'll move it to OT. Thanks.
Speedlimit...
And one of the reasons many people do not post here. What is amusing to me is that the majority of kibitzers do not speak "pressure ratio" or understand the actual dynamics of fluid flow on turbines and compressors. If you guys want to make this a technical discussion, then have it. If you want it to be a thread to embarrass the OP and yourselves, then I'll move it to OT. Thanks.Speedlimit...
Sep 21, 2006, 02:25 PM
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Originally Posted by dubIX
Here ya go...http://auto.howstuffworks.com/turbo.htm
i forgot i posted this.... thanks to those who actually helped..
Sep 21, 2006, 02:29 PM
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Ah come on, we weren't making fun of him. I was posting useful stuff while talking about animals and flux capacitors. It's all joking around and having fun while helping out a fellow member. Nothing personal godfather. Please don't give me the kiss of death.
Sep 21, 2006, 02:43 PM
#14
It's like a windmill. The exhaust gas is the wind that turns the fan that turns a shaft. It's just that instead of being attached to a grinding wheel or something, the shaft is attached to another fan that pumps air into the intake system. If you aren't sure what I mean, I suggest a backpacking trip through Holland...with detours to certain special bars...actually I suggest that anyway...
Sep 21, 2006, 02:48 PM
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Well I will try to get this a little more technical for everyone, but I will include on why turbos make boost.
really as said before a turbine wheel is spun by exhaust gasses, Based on the size of your cylinder ( the amount of air/fuel can fill that cylinder) Depends on how much exhaust gas is available to force the turbine to spin.
But how does it make boost? well that wheel is connected to a small shaft in the middle of the turbo system, this shaft spins on very very high speed bearings (sometimes ball bearing) and this is where we need oil and sometimes water to lubricate this shaft because this small shaft can spin sometimes up to 100,000 rpm. that shaft is then connected to another turbine wheel, this sucks in outside air from one side and pushes it into your intake manifold. the more exhaust pressure that is available from the engine spins the turbine wheel faster which in turn spins the other turbine wheel faster as well forcing the turbine to suck in more air and then push it into the manifold via your intercooler piping.
on a side note heres how a wastegate works, and you do need a wastegate. from a technical standpoint the easiest way to look at a wastegate is simply as a boost controller. there is a spring inside of the wastegate ( or wastegate actuator depending on internal or external wastegate arrangement) and that spring has a pressure rating to it, for simplistic sake lets say 10 psi, because the exhaust pressure can come on so fast and so violently it would be next to impossible to controll exactly how much boost is created, and if there was no way to regulate it the turbo would just make as much boost as it could. so now when 10Psi ( pounds per square inch) is achieved the pressure overpowers this spring, and the wastegate uses exhaust that would normally be used to spin the turbine wheel is redirected just into the exhaust system ( or into the atmosphere depending on setup)
I hope that clears it up for you but I wanted to get this post back on track, Come on people everyone has to start somewhere
really as said before a turbine wheel is spun by exhaust gasses, Based on the size of your cylinder ( the amount of air/fuel can fill that cylinder) Depends on how much exhaust gas is available to force the turbine to spin.
But how does it make boost? well that wheel is connected to a small shaft in the middle of the turbo system, this shaft spins on very very high speed bearings (sometimes ball bearing) and this is where we need oil and sometimes water to lubricate this shaft because this small shaft can spin sometimes up to 100,000 rpm. that shaft is then connected to another turbine wheel, this sucks in outside air from one side and pushes it into your intake manifold. the more exhaust pressure that is available from the engine spins the turbine wheel faster which in turn spins the other turbine wheel faster as well forcing the turbine to suck in more air and then push it into the manifold via your intercooler piping.
on a side note heres how a wastegate works, and you do need a wastegate. from a technical standpoint the easiest way to look at a wastegate is simply as a boost controller. there is a spring inside of the wastegate ( or wastegate actuator depending on internal or external wastegate arrangement) and that spring has a pressure rating to it, for simplistic sake lets say 10 psi, because the exhaust pressure can come on so fast and so violently it would be next to impossible to controll exactly how much boost is created, and if there was no way to regulate it the turbo would just make as much boost as it could. so now when 10Psi ( pounds per square inch) is achieved the pressure overpowers this spring, and the wastegate uses exhaust that would normally be used to spin the turbine wheel is redirected just into the exhaust system ( or into the atmosphere depending on setup)
I hope that clears it up for you but I wanted to get this post back on track, Come on people everyone has to start somewhere